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METHOD:PUBLISH
BEGIN:VTIMEZONE
TZID:Europe/Berlin
X-LIC-LOCATION:Europe/Berlin
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:19700329T020000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:19701025T030000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
UID:77AB-5BDAE180-7-46F5D800
SUMMARY:Prof. Dr. Niklas Beisert (ETH Zürich)
LOCATION:Christian-Gerthsen-Hörsaal\, Lise-Meitner-Haus\, Newtonstraße 15\,
12489 Berlin
DESCRIPTION:Title: Yangian Symmetry and Integrability of Planar N = 4 SYM\n
\nAbstract: This talk is about integrability of planar N=4 super Yang-Mill
s theory. I will review the notion of integrability in the AdS/CFT context
and what it means for planar scattering and Wilson loops including select
ed results. I will then present a concrete notion of the corresponding Yan
gian symmetry in this model\, show that it holds true\, and discuss the (p
erturbative) implications for correlation functions and Wilson loops.
CLASS:PUBLIC
CREATED:20181101T112507Z
DTSTAMP:20181101T112507Z
LAST-MODIFIED:20181106T122142Z
DTSTART;TZID=Europe/Berlin:20181113T151500
DTEND;TZID=Europe/Berlin:20181113T161500
TRANSP:OPAQUE
X-SOGO-SEND-APPOINTMENT-NOTIFICATIONS:NO
CATEGORIES:Seminar
END:VEVENT
BEGIN:VEVENT
UID:1D4A-5BE1A500-1-5ED01500
SUMMARY:Prof. Dr. Karen Yeats (Waterloo U)
LOCATION:Christian-Gerthsen-Hörsaal\, Lise-Meitner-Haus\, Newtonstraße 15\,
12489 Berlin
DESCRIPTION:Title: Some discrete mathematical thoughts on Dyson-Schwinger e
quations\n\nAbstract: Dyson-Schwinger equations are the quantum analogues
of the equations of motion and so are physically very important and useful
. In their diagrammatic form they also show some nice discrete mathematic
al structures. For example\, diagrammatically they generate certain class
es of Feynman diagrams and so act like combinatorial specifications\, and
they are compatible with algebraic structures on Feynman diagrams\, like r
enormalization Hopf algebras. In this colloquium I will overview the phys
ics and the math of this and close with a different combinatorial expansio
n that can go beyond naive Feynman diagrammatics and solve some Dyson-Schw
inger equations using an unusual expansion indexed by rooted connected cho
rd diagrams.
CLASS:PUBLIC
CATEGORIES:Seminar
CREATED:20181106T142834Z
DTSTAMP:20181106T142834Z
LAST-MODIFIED:20190201T113721Z
DTSTART;TZID=Europe/Berlin:20190205T151500
DTEND;TZID=Europe/Berlin:20190205T161500
TRANSP:OPAQUE
X-SOGO-SEND-APPOINTMENT-NOTIFICATIONS:NO
END:VEVENT
BEGIN:VEVENT
UID:58A6-5CD3DC80-1-306F9400
SUMMARY:Dr. Eran Palti (MPP Münich)
LOCATION:Hörsaal 0'310\, Erwin Schrödinger Zentrum\, Rudower Chaussee 26\,
12489 Berlin
DESCRIPTION:Title: The Swampland and Emergence\n\nAbstract: The Swampland p
rogram aims to distinguish effective field theories that can be consistent
ly completed into quantum gravity in the ultraviolet from those which cann
ot. It has lead to a number of proposals\, or conjectures\, regarding the
required properties of effective theories. I will review some of the evide
nce for these and propose that they arise due to a particular aspect of du
ality where propagating fields in the infrared are emergent from the colle
ctive properties of infinite towers of states. Time permitting\, I will di
scuss some applications of the conjectures\, in particular to accelerating
cosmologies and to massive spin-2 fields.
CLASS:PUBLIC
CATEGORIES:Seminar
CREATED:20190509T075842Z
DTSTAMP:20190509T075842Z
LAST-MODIFIED:20190509T075950Z
DTSTART;TZID=Europe/Berlin:20190517T133000
DTEND;TZID=Europe/Berlin:20190517T143000
TRANSP:OPAQUE
X-SOGO-SEND-APPOINTMENT-NOTIFICATIONS:NO
SEQUENCE:1
END:VEVENT
BEGIN:VEVENT
UID:3034-5BE18280-1-5292D480
SUMMARY:Prof. Dr. Lance Dixon (SLAC)
LOCATION:Hörsaals 0'110\, Erwin Schrödinger Zentrum\, Rudower Chaussee 26\
, 12489 Berlin
DESCRIPTION:Title: Bootstrapping Amplitudes in Planar N=4 Super-Yang-Mills
Theory\n\nAbstract: In the planar limit of a large number of colors\, N=4
super Yang-Mills theory is integrable\, and remarkable advances have been
made in determining operator anomalous dimensions and more to all loop ord
ers. In this talk I'll describe recent progress in constructing scattering
amplitudes in this theory to high loop order. Planar N=4 amplitudes are
dual to light-like polygonal Wilson-loops\, and are only nontrivial for si
x or more gluons. The spaces of functions to which the amplitudes belong
are so restrictive that only a few constraints are needed to simply write
down the answer\, through seven loops in the six-gluon case and four loops
in the seven-gluon case. The results are multi-variate functions of the
kinematics\, which can be analyzed in various limits in order to study how
high loop order amplitudes factorize. One can also extrapolate from weak
to strong coupling\, and compare with the AdS/CFT dual description availab
le there.
CLASS:PUBLIC
CREATED:20181106T120210Z
DTSTAMP:20181106T120210Z
LAST-MODIFIED:20181214T072824Z
DTSTART;TZID=Europe/Berlin:20190108T151500
DTEND;TZID=Europe/Berlin:20190108T161500
TRANSP:OPAQUE
X-SOGO-SEND-APPOINTMENT-NOTIFICATIONS:NO
CATEGORIES:Seminar
SEQUENCE:1
END:VEVENT
BEGIN:VEVENT
UID:7503-5BE2ED00-5-7EB0BF80
SUMMARY:Dr. Yotam Soreq (CERN)
LOCATION:Christian-Gerthsen-Hörsaal\, Lise-Meitner-Haus\, Newtonstraße 15\,
12489 Berlin
CLASS:PUBLIC
CATEGORIES:Seminar
CREATED:20181107T134733Z
DTSTAMP:20181107T134733Z
LAST-MODIFIED:20181205T072417Z
DTSTART;TZID=Europe/Berlin:20181211T151500
DTEND;TZID=Europe/Berlin:20181211T161500
TRANSP:OPAQUE
X-SOGO-SEND-APPOINTMENT-NOTIFICATIONS:NO
DESCRIPTION:Title: The Quest for New Physics\n\nAbstract:\nThe Standard Mod
el of particle physics well describes a vast number of observables up to t
he TeV scale. However\, it cannot be a complete description of Nature as i
t cannot explain various experimental observations. For example\, it lacks
a viable dark matter candidate and can neither explain the observed matte
r/antimatter asymmetry of our Universe nor neutrino oscillations. \nThus\,
physics beyond the Standard Model is well motivated. \nIn this colloquium
\, we explore different methods to probe new physics at multiple energy sc
ales\, from high energy colliders\, such as the LHC\, to precision low ene
rgy experiments. In particular\, we focus on searches for new force carrie
rs at the LHCb experiment and in precision atomic spectroscopy and for axi
on like particles at the GeV Scale. We show that the inclusive search for
dark photons at the LHCb experiment already probes new parameter space and
can be easily interpreted for a large variety of new physics models. On t
he precision frontier\, we explore the potential of isotope shift spectros
copy to probe new long range force carriers. \n
END:VEVENT
BEGIN:VEVENT
UID:7EFD-5F9A6F80-4F-6B58A600
SUMMARY:Prof. Dr. Gaetan Borot (HU)
DESCRIPTION:Title: W-algebras: between representation theory\, 2d geometry
and 5d gauge theories\n\nAbstract: W-algebras associated to simple Lie alg
ebras are non-linear generalisations of the Virasoro algebra\, from which
certain CFTs can be defined. Using a formalism of Kontsevich and Soibelman
and representation theory of W-algebras via free fields (when this exist)
\, one can construct from them systems of PDEs whose solution is computed
by a "topological recursion". Such solutions carry information about 2d (w
orldsheet) geometry\, and "topological recursion" mean this information is
reached by induction on the Euler characteristic that resembles a cutting
/pasting approach. They are sometimes expressible as integrals on the mod
uli space of complex curves or as topological string A-model amplitudes (f
or certain target spaces)\, and gives suitable definition of topological s
tring B-model for certain type of complex 1d singularities. I will give an
overview of these connections\, and describe if time permits sketch a mor
e recent link (ongoing work) to Nekrasov partition functions in 5d gauge t
heories (in which W-algebra are known to appear since Alday-Gaiotto-Tachik
awa proposal). This is based on joint works with Andersen\, Chekhov\, Oran
tin\, Bouchard\, Chidambaram\, Creutzig\, Noshchenko\, Kramer\, Schüler.\n
\nFor Zoom Meeting ID or link\, see the announcement email from the qft-co
lloquium mailing list\, or write to Agostino Patella (agostino.patella@phy
sik.hu-berlin.de).
CLASS:PUBLIC
CREATED:20190509T080107Z
DTSTAMP:20190509T080107Z
LAST-MODIFIED:20210201T105331Z
DTSTART;TZID=Europe/Berlin:20210226T133000
DTEND;TZID=Europe/Berlin:20210226T143000
TRANSP:OPAQUE
LOCATION:Zoom Webinar (see qft-colloquium email for meeting ID/link)
CATEGORIES:Seminar
SEQUENCE:10
END:VEVENT
BEGIN:VEVENT
UID:6F72-5F895300-D-23EF1F80
SUMMARY:Prof. Dr. Pierpaolo Mastrolia (Università degli Studi di Padova)
DESCRIPTION:Title: Diagrams\, Interactions and Intersections\n\nAbstract: H
igh energy particle collisions are an ideal framework for accessing\nnew i
nformation on matter constituents and forces of Nature. Advances\nin Theor
etical Physics depend on our ability to describe the\nscattering processes
among elementary particles at very high accuracy.\nTheoretical Physicists
calculate scattering amplitudes\, numbers that\nare related to the probab
ilities of different aftermath of particle\nscattering\, which encode the
chance that a given set of particles will\nturn into certain other particl
es after an impact. Feynman graphs are\na convenient way to represent part
icle collisions.\nThe mathematical methods required to describe scattering
events which\ntake place from the smallest to the largest scale of the Un
iverse\nbenefit from concepts borrowed from the rich research in mathemati
cal\ndisciplines\, such as (differential and algebraic) Geometry\, Topolog
y\nand Number Theory. In this seminar\, I elaborate on the diagrammatic\na
pproach to Fundamental Interactions via Scattering Amplitudes and\nFeynman
integrals\, and on their algebraic properties which have been\nrecently u
nderstood to be ruled by Intersection Numbers: a novel\nconnection between
Physics and Mathematics.\n\nFor Zoom Meeting ID or link\, see the announc
ement email from the qft-colloquium mailing list\, or write to Agostino Pa
tella (agostino.patella@physik.hu-berlin.de).
CLASS:PUBLIC
CREATED:20190509T080107Z
DTSTAMP:20190509T080107Z
LAST-MODIFIED:20210201T105406Z
DTSTART;TZID=Europe/Berlin:20210129T133000
DTEND;TZID=Europe/Berlin:20210129T143000
TRANSP:OPAQUE
LOCATION:Zoom Webinar (see qft-colloquium email for meeting ID/link)
CATEGORIES:Seminar
SEQUENCE:9
END:VEVENT
BEGIN:VEVENT
UID:E5D-607ED700-219-68B27200
SUMMARY:Dr. Emanuel Malek (HU)
DESCRIPTION:Title: Exceptional Field Theory and applications to the AdS/CFT
correspondence\n\nAbstract: The AdS/CFT correspondence is a powerful tool
for studying strongly coupled QFTs by performing computations in string t
heory and its low energy limit\, supergravity. I will review Exceptional F
ield Theory\, a formalism that unifies gravitational and flux degrees of f
reedom of supergravity\, and thereby makes a large exceptional symmetry gr
oup manifest. This large symmetry group simplifies many complicated calcul
ations in AdS backgrounds\, such as constructing consistent truncations or
computing the spectrum of linearised fluctuations around AdS vacua. I wil
l show how this can be used to gain insights into strongly coupled QFTs. F
inally\, it time permits\, I will discuss applications to non-supersymmetr
ic AdS vacua.\n\nFor Zoom Meeting ID or link\, see the announcement email
from the qft-colloquium mailing list\, or write to Agostino Patella (agost
ino.patella@physik.hu-berlin.de).
CLASS:PUBLIC
CREATED:20190509T080107Z
DTSTAMP:20190509T080107Z
LAST-MODIFIED:20210420T141606Z
DTSTART;TZID=Europe/Berlin:20210430T140000
DTEND;TZID=Europe/Berlin:20210430T150000
TRANSP:OPAQUE
LOCATION:Zoom Webinar (see qft-colloquium email for meeting ID/link)
CATEGORIES:Seminar
SEQUENCE:11
END:VEVENT
BEGIN:VEVENT
UID:4C5-6385A180-3-6E113C00
SUMMARY:Dr. Martin Lüscher (CERN)
LOCATION:Zoom\, broadcasted in IRIS 1\,221
CLASS:PUBLIC
CATEGORIES:Seminar
X-SOGO-SEND-APPOINTMENT-NOTIFICATIONS:NO
TRANSP:OPAQUE
DTSTART;TZID=Europe/Berlin:20230120T140000
DTEND;TZID=Europe/Berlin:20230120T153000
CREATED:20221010T115501Z
DTSTAMP:20221010T115501Z
LAST-MODIFIED:20221129T060828Z
SEQUENCE:3
DESCRIPTION:Title: Chiral symmetry\, the topological charge and the Yang-Mi
lls gradient flow \n\nAbstract: This talk is about an old issue that arose
after the instantons were discovered and numerical lattice gauge theory b
ecame a popular subject. The question is whether the division of the field
space in topological sectors is a property of QCD at the fully non-pertur
bative level or merely an emergent asymptotic feature of the theory in the
semi-classical limit. Exactly how the topological susceptibility and the
higher moments of the topological charge distribution are defined beyond t
he semi-classical level is in fact not obvious\, since the formal expressi
ons for the moments are manifestly ultraviolet-divergent.\n\nImportant con
ceptual developments in lattice QCD (formulations preserving chiral symmet
ry and the proof of the finiteness of the Yang-Mills gradient flow) eventu
ally permitted the question to be answered and moreover led to expressions
for the moments\, which are finite\, regularization-independent and consi
stent with the chiral Ward identities.
END:VEVENT
BEGIN:VEVENT
UID:66B2-5CD3DE80-7-6B69D300
SUMMARY:Prof. Dr. Pedro Schwaller (Mainz U)
DESCRIPTION:Title: Audible Axions\n\nAbstract: Gravitational wave observati
ons provide a new and unique window into the early universe. I will start
by explaining why this is the case\, and give an overview of new physics s
cenarios that give rise to a stochastic gravitational wave background in t
he early universe\, and therefore may be testable by future gravitational
wave observations. Then I will focus on the audible axion scenario\, a cla
ss of axion models whose cosmological evolution leaves an observable impri
nt in the gravitational wave background. This allows a new and unique prob
e of very high scale axions\, with symmetry breaking scales close to the G
UT or string scale.
CLASS:PUBLIC
CREATED:20190509T080107Z
DTSTAMP:20190509T080107Z
LAST-MODIFIED:20190626T082652Z
DTSTART;TZID=Europe/Berlin:20190701T151500
DTEND;TZID=Europe/Berlin:20190701T161500
TRANSP:OPAQUE
LOCATION:Christian-Gerthsen-Hörsaal\, Lise-Meitner-Haus\, Newtonstraße 15\,
12489 Berlin
CATEGORIES:Seminar
SEQUENCE:2
END:VEVENT
BEGIN:VEVENT
UID:591B-5CD3DE00-B-449AA100
SUMMARY:CANCELLED - Dr. Claudia Frugiuele (CERN)
DESCRIPTION:Title: A new quest for physics beyond the Standard Model\n\nAbs
tract: The hunt for physics beyond the Standard Model is at the dawn of a
new era: the quest for dark sectors. These consist of light sub-GeV partic
les very weakly coupled to the visible sector\, and they are ubiquitous i
n many scenarios addressing important open questions such as the microscop
ic identity of dark matter or the origin of neutrino masses and mixing. Da
rk sectors motivate novel search strategies that are drastically different
than\, but complementary to\, those at traditional high-energy colliders.
Furthermore\, several ongoing experiments\, if properly tailored\, could
play a crucial role in the hunt for dark sectors. I will discuss how the d
istinctive signatures of such physics can already be searched for with ex
isting/planned experiments\, including neutrino-proton fixed-target experi
ments and precision atomic measurements.
CLASS:PUBLIC
CREATED:20190509T080107Z
DTSTAMP:20190509T080107Z
LAST-MODIFIED:20190603T124000Z
DTSTART;TZID=Europe/Berlin:20190603T151500
DTEND;TZID=Europe/Berlin:20190603T161500
TRANSP:OPAQUE
LOCATION:Christian-Gerthsen-Hörsaal\, Lise-Meitner-Haus\, Newtonstraße 15\,
12489 Berlin
CATEGORIES:Seminar
SEQUENCE:1
END:VEVENT
BEGIN:VEVENT
UID:71D4-5DB6CE00-87-21A90C00
SUMMARY:Prof. Dr. Nazario Tantalo (Roma Tor Vergata)
DESCRIPTION:Title: QED corrections to hadronic decays on the lattice\n\nAbs
tract: QED radiative corrections to hadronic observables are generally rat
her small but they become phenomenologically relevant when the target prec
ision is at the percent level. This is the case of leptonic and semilepton
ic decays of light and heavy pseudoscalar mesons. On the one hand\, QED r
adiative corrections to hadronic observables can be calculated with the re
quired non-perturbative accuracy by using lattice techniques. On the other
hand\, the inclusion of electromagnetic interactions in a lattice calcula
tion is a challenging problem because QED is a long-range unconfined inter
action and numerical simulations necessarily require a finite volume. The
problem is particularly delicate in the case of QED radiative corrections
to decay rates because of the appearance of infrared divergences (proporti
onal to the logarithm of the lattice volume) at intermediate stages of the
calculations. In this talk I will briefly review the recent theoretical a
dvances that opened the way to realistic non-perturbative simulations of Q
CD+QED\, discuss a method that allows to calculate QED radiative correctio
ns to hadronic decay rates and present the results of a non-perturbative c
alculation of the leptonic decay rates P-> l nu (gamma) in the case of lig
ht (P=pi\,K) and charmed (P=D\,Ds) pseudoscalar mesons.
CLASS:PUBLIC
CREATED:20190509T080107Z
DTSTAMP:20190509T080107Z
LAST-MODIFIED:20200106T100411Z
DTSTART;TZID=Europe/Berlin:20200110T133000
DTEND;TZID=Europe/Berlin:20200110T143000
TRANSP:OPAQUE
LOCATION:Konferenzraum 0'119\, Erwin Schrödinger-Zentrum\, Rudower Chaussee
26\, 12489 Berlin
CATEGORIES:Seminar
SEQUENCE:6
END:VEVENT
BEGIN:VEVENT
UID:6CF0-5DB6CC80-5-4C78E600
SUMMARY:Prof. Dr. Christopher Hull (Imperial College London)
DESCRIPTION:Title: What is String Theory?\n\nAbstract: The status of string
theory will be examined\, and what is known and what is unknown about the
theory will be discussed.\nString theory has special duality symmetries t
hat do not occur in conventional field theories\, and some of the implicat
ions of these will be explored\, and the implications for the nature of sp
ace-time will be investigated.
CLASS:PUBLIC
CREATED:20190509T080107Z
DTSTAMP:20190509T080107Z
LAST-MODIFIED:20191115T115404Z
DTSTART;TZID=Europe/Berlin:20191122T133000
DTEND;TZID=Europe/Berlin:20191122T143000
TRANSP:OPAQUE
LOCATION:Konferenzraum 0'119\, Erwin Schrödinger-Zentrum\, Rudower Chaussee
26\, 12489 Berlin
CATEGORIES:Seminar
SEQUENCE:5
END:VEVENT
BEGIN:VEVENT
UID:1354-5DB6CE00-63-4E2CA500
SUMMARY:Dr. Rafael Porto (DESY & Hamburg U)
DESCRIPTION:Title: Precision Gravity: from the LHC to LISA\n\nAbstract: The
nascent field of gravitational wave (GW) science will be an interdiscipli
nary subject — enriching different branches of physics — yet the associate
d computational challenges are enormous. Faithful theoretical templates ar
e a compulsory ingredient for data analysis and reliable physical interpre
tation of the signals. \nYet\, while current templates for compact binary
sources may be sufficient for detection and crude parameter estimation\, t
hey are still too coarse for precision physics with GW data. We then find
ourselves in a situation in which\, for key processes within empirical rea
ch\, theoretical uncertainties may dominate. To move forward\, and profit
the most from GW observations\, more accurate waveforms will be needed. Th
is will be critical\, as I will discuss\, to study the equation of state
of neutron stars and the nature of black holes\; as well as potentially su
ccessful searches for exotic compact objects and putative ultra-light (dar
k matter) particles in the Universe. \nThe ‘effective field theory approac
h’ to the binary inspiral problem in general relativity — which my collabo
rators and I have developed — has been instrumental for the construction o
f the state-of-the-art GW template bank. I will review how these and other
novel techniques borrowed from particle physics have transformed the stud
y of the two-body problem in gravity\, providing key new results and pavin
g the road forward to a new era of foundational investigations in physics
through GW precision data.
CLASS:PUBLIC
CREATED:20190509T080107Z
DTSTAMP:20190509T080107Z
LAST-MODIFIED:20200212T095937Z
DTSTART;TZID=Europe/Berlin:20200214T133000
DTEND;TZID=Europe/Berlin:20200214T143000
TRANSP:OPAQUE
LOCATION:Konferenzraum 0'119\, Erwin Schrödinger-Zentrum\, Rudower Chaussee
26\, 12489 Berlin
CATEGORIES:Seminar
SEQUENCE:6
END:VEVENT
BEGIN:VEVENT
UID:2786-61D6DE80-D-7A7A270
SUMMARY:Prof. Dr. Gabriele Travaglini (Queen Mary\, London)
DESCRIPTION:Title: From scattering amplitudes to Newton’s potential and bey
ond \n\nScattering amplitudes of elementary particles exhibit a fascinatin
g simplicity\, which is entirely obscured in textbook Feynman-diagram comp
utations. While these quantities find their primary application to collid
er physics\, describing the dynamics of the tiniest particles in the univ
erse\, they also characterise the interactions among some of its heaviest
objects\, such as black holes. Violent collisions among black holes occur
where tremendous amounts of energy are emitted\, in the form of gravitatio
nal waves. 100 years after having been predicted by Einstein\, their extra
ordinary direct detection in 2015 opened a fascinating window of observati
on of our universe at extreme energies never probed before\, and it is no
w crucial to develop novel efficient methods for highly needed high-precis
ion predictions. Thanks to their inherent simplicity\, amplitudes are idea
lly suited to this task. I will begin by reviewing the computation of a v
ery familiar quantity Newton's potential\, from scattering amplitudes and
unitarity. I will then explain how to compute directly observable quantit
ies such as the scattering angle for light or for gravitons passing by a h
eavy mass such as a black hole. These computations are further simplified
thanks to a remarkable\, yet still mysterious connection between scatterin
g amplitudes of gluons (in Yang-Mills theory) and those of gravitons (in E
instein's General relativity)\, known as the "double copy"\, whereby the l
atter amplitudes can be expressed\, schematically\, as sums of squares of
the former -- a property that cannot be possibly guessed by simply staring
at the Lagrangians of the two theories. I will conclude by discussing the
prospects of performing computations in Einstein gravity to higher orders
in Newton's constant using a new\, gauge-invariant version of the double
copy\, and as an example I will briefly discuss the computation of the sc
attering angle for classical black hole scattering to third post-Minkowski
an order (or O(G^3) in Newton's constant G).
CLASS:PUBLIC
CREATED:20190509T080107Z
DTSTAMP:20190509T080107Z
LAST-MODIFIED:20220120T153921Z
DTSTART;TZID=Europe/Berlin:20220128T140000
DTEND;TZID=Europe/Berlin:20220128T150000
TRANSP:OPAQUE
LOCATION:TBA
CATEGORIES:Seminar
SEQUENCE:13
X-SOGO-SEND-APPOINTMENT-NOTIFICATIONS:NO
END:VEVENT
BEGIN:VEVENT
UID:E5D-5DB6CD80-CB-79D22980
SUMMARY:Prof. Dr. Marika Taylor (Southampton U)
DESCRIPTION:Title: New anomalies in superconformal field theories\n\nAbstra
ct: In recent years there has been considerable interest in computing part
ition functions of supersymmetric field theories on curved backgrounds usi
ng localisation methods. These computations led to a rather surprising dis
covery: supersymmetry is anomalous in 4d N=1 SCFTs with anomalous R symmet
ry. This talk will explain the origin of this anomaly\, using both Wess-Zu
mino consistency conditions and perturbative arguments. The anomaly first
arises in one loop contributions to four point functions involving two glo
bal currents and two supercurrents\, in a way that is directly analogous t
o the usual triangle anomaly. We will conclude by discussing the implicati
ons of this anomaly.
CLASS:PUBLIC
CREATED:20190509T080107Z
DTSTAMP:20190509T080107Z
LAST-MODIFIED:20191208T195517Z
DTSTART;TZID=Europe/Berlin:20191213T133000
DTEND;TZID=Europe/Berlin:20191213T143000
TRANSP:OPAQUE
LOCATION:Konferenzraum 0'119\, Erwin Schrödinger-Zentrum\, Rudower Chaussee
26\, 12489 Berlin
CATEGORIES:Seminar
SEQUENCE:6
END:VEVENT
BEGIN:VEVENT
UID:3633-5E970D00-7-73AA3180
SUMMARY:Prof. Dr. Giulia Zanderighi (Max Planck Institut München)
DESCRIPTION:Title: Precision at the LHC: why and how\n\nAbstract: With Run
II\, the LHC experiment already reached an unprecedented level of precisio
n compared to previous hadron colliders. The amount of data collected in R
un III and the High-Luminosity run will increase quickly and dramatically.
I will discuss specific challenges to theorists that must be overcome to
provide predictions that have the precision necessary to match the accurac
y of data. A few novel ideas to exploit this precision directly or indirec
tly will also be discussed.\n\nFor Zoom Meeting ID or link\, see the annou
ncement email from the qft-colloquium mailing list\, or write to Agostino
Patella (agostino.patella@physik.hu-berlin.de).
CLASS:PUBLIC
CREATED:20190509T080107Z
DTSTAMP:20190509T080107Z
LAST-MODIFIED:20200522T102148Z
DTSTART;TZID=Europe/Berlin:20200529T133000
DTEND;TZID=Europe/Berlin:20200529T143000
TRANSP:OPAQUE
LOCATION:Zoom Webinar (see qft-colloquium email for meeting ID/link)
CATEGORIES:Seminar
SEQUENCE:8
END:VEVENT
BEGIN:VEVENT
UID:43B2-5F966F80-B-1F973980
SUMMARY:Prof. Dr. Harvey Meyer (Johannes Gutenberg Universität Mainz)
DESCRIPTION:Title: The hadronic contributions to the anomalous magnetic mom
ent of the muon\n\nAbstract:\nThe anomalous magnetic moment of the muon se
rves as a low-energy precision test of the Standard Model of particle phys
ics. The White Paper (arXiv:2006.04822) recently published in Physics Repo
rts concludes that a tension of 3.7 standard deviations persists between t
he direct measurement and the Standard Model prediction of the anomalous m
agnetic moment of the muon. A new direct measurement is expected very soon
by the E989 experiment at Fermilab. On the theory side\, the uncertainty
of the SM prediction is quasi-saturated by the hadronic contributions. I w
ill focus on the effort by the lattice QCD community to compute these hadr
onic contributions and compare these calculations to phenomenological dete
rminations.\n\nFor Zoom Meeting ID or link\, see the announcement email fr
om the qft-colloquium mailing list\, or write to Agostino Patella (agostin
o.patella@physik.hu-berlin.de).
CLASS:PUBLIC
CREATED:20190509T080107Z
DTSTAMP:20190509T080107Z
LAST-MODIFIED:20201118T095849Z
DTSTART;TZID=Europe/Berlin:20201127T133000
DTEND;TZID=Europe/Berlin:20201127T143000
TRANSP:OPAQUE
LOCATION:Zoom Webinar (see qft-colloquium email for meeting ID/link)
CATEGORIES:Seminar
SEQUENCE:10
END:VEVENT
BEGIN:VEVENT
UID:656C-5F9A6F80-D-4FB19200
SUMMARY:Prof. Dr. Johanna Erdmenger (Würzburg U.)
DESCRIPTION:Title: Gauge/gravity duality for composite Higgs models and th
e top mass\n\nAbstract: Composite Higgs models are Beyond the Standard Mod
el approaches involving a strongly coupled sector in which the Higgs parti
cle is a Goldstone boson of a spontaneously broken symmetry\, in analogy t
o pions in QCD. I will discuss gauge/gravity dual descriptions of explicit
realizations of composite Higgs models using insights from non-conformal
examples of the AdS/CFT correspondence. I will explain how to calculate
particle masses and decay constants for proposed Sp(4) and SU(4) gauge th
eories. The results obtained compare favourably to lattice gauge theory st
udies and go beyond those due to a greater flexibility in choosing the fer
mion content. That content changes the running of the couplings and its c
hoice can lead to sizable changes in the bound state masses. The `top part
ners' present in composite Higgs are modelled by dual fermionic fields i
n the bulk. Including suitable higher dimension operators can ensure a to
p mass consistent with the Standard Model.\n\nFor Zoom Meeting ID or link\
, see the announcement email from the qft-colloquium mailing list\, or wri
te to Agostino Patella (agostino.patella@physik.hu-berlin.de).
CLASS:PUBLIC
CREATED:20190509T080107Z
DTSTAMP:20190509T080107Z
LAST-MODIFIED:20201214T115739Z
DTSTART;TZID=Europe/Berlin:20201216T140000
DTEND;TZID=Europe/Berlin:20201216T150000
TRANSP:OPAQUE
LOCATION:Zoom Webinar (see qft-colloquium email for meeting ID/link)
CATEGORIES:Seminar
SEQUENCE:12
END:VEVENT
BEGIN:VEVENT
UID:47F8-61D6DF00-D-77930580
SUMMARY:Dr. Maxwell T. Hansen (Edinburgh U.)
DESCRIPTION:Title: Multi-particle observables from a finite Euclidean space
time\n\nNumerical calculations of lattice regularized QFTs are a powerful
tool to understand such theories when analytic methods are not applicable.
However\, the utility of numerical results can be affected by two issues:
(i) calculations are necessarily performed in a finite-volume spacetime a
nd (ii) Euclidean (rather than Minkowski) signature correlation functions
are evaluated. Both aspects play an especially important role for multi-pa
rticle observables including scattering and decay amplitudes and inclusive
rates. In this colloquium\, I will discuss progress for extracting such o
bservables from numerical lattice field theory based on two strategies. On
e is to use the finite-volume as a tool\, rather than an unwanted artefact
\, and to apply generic field theoretic relations between finite-volume qu
antities and infinite-volume amplitudes. The second is to carefully regula
te the inverse Laplace transform\, in order to estimate Minkowski observab
les directly from numerical Euclidean correlators.\n
CLASS:PUBLIC
CREATED:20190509T080107Z
DTSTAMP:20190509T080107Z
LAST-MODIFIED:20220216T100415Z
DTSTART;TZID=Europe/Berlin:20220218T140000
DTEND;TZID=Europe/Berlin:20220218T150000
TRANSP:OPAQUE
LOCATION:Zoom Webinar (see qft-colloquium email for meeting ID/link)
CATEGORIES:Seminar
SEQUENCE:15
X-SOGO-SEND-APPOINTMENT-NOTIFICATIONS:NO
END:VEVENT
BEGIN:VEVENT
UID:3733F7-63612000-F-7BCE7600
SUMMARY:Dr. Matthew McCullough (CERN)
LOCATION:TBA
CLASS:PUBLIC
CATEGORIES:Seminar
X-SOGO-SEND-APPOINTMENT-NOTIFICATIONS:NO
TRANSP:OPAQUE
DTSTART;TZID=Europe/Berlin:20230428T140000
DTEND;TZID=Europe/Berlin:20230428T153000
CREATED:20221010T115501Z
DTSTAMP:20221010T115501Z
LAST-MODIFIED:20221013T115628Z
SEQUENCE:3
DESCRIPTION:Title: TBA\n\nAbstract: TBA
END:VEVENT
BEGIN:VEVENT
UID:2A3F-607EE300-1-1BA62B00
SUMMARY:Prof. Dr. Lorenzo Magnea (Torino U.)
DESCRIPTION:Title: The infrared structure of perturbative QCD\n\nAbstract:
Infrared problems in the evaluation of gauge-theory amplitudes and cross s
ections have been a focus of theoretical research for close to a century.
Yet\, new discoveries and new ideas continue to emerge\, and high-precisi
on phenomenology requires further sharpening of our tools. I will review o
ur present understanding of the infrared structure of non-abelian scatteri
ng amplitudes\, emphasising the ideas of universality\, factorisation\, ev
olution and resummation. I will briefly introduce new ideas for the analys
is of soft divergences using conformal field theory tools\, and finally I
will discuss the problem of infrared subtraction for high-order prediction
s of complex collider observables.
CLASS:PUBLIC
CREATED:20190509T080107Z
DTSTAMP:20190509T080107Z
LAST-MODIFIED:20210621T174959Z
DTSTART;TZID=Europe/Berlin:20210625T140000
DTEND;TZID=Europe/Berlin:20210625T150000
TRANSP:OPAQUE
LOCATION:Zoom Webinar (see qft-colloquium email for meeting ID/link)
CATEGORIES:Seminar
SEQUENCE:12
END:VEVENT
BEGIN:VEVENT
UID:62F2-624ACA80-31-6872B780
SUMMARY:Prof. James Drummond (Southampton U.)
LOCATION:Zoom Webinar (see qft-colloquium email for meeting ID/link)
DESCRIPTION:Title: Geometric properties of scattering amplitudes\n\nAbstrac
t: I will review a number of geometric approaches to understanding propert
ies of scattering amplitudes. In particular we will discuss the relation o
f the geometry of the kinematical space to the analytic behaviour of ampli
tudes as functions on this space. Our focus will be on massless scattering
amplitudes with N=4 super Yang-Mills theory as a guiding example\, where
cluster algebras of Grassmannian spaces play a central role.
CLASS:PUBLIC
CATEGORIES:Seminar
CREATED:20220404T104047Z
DTSTAMP:20220404T104047Z
LAST-MODIFIED:20220422T125035Z
DTSTART;TZID=Europe/Berlin:20220429T140000
DTEND;TZID=Europe/Berlin:20220429T150000
TRANSP:OPAQUE
END:VEVENT
BEGIN:VEVENT
UID:62F0-624AEE00-11-9F64470
SUMMARY:Prof. Kirill Melnikov (TTP\, Karlsruhe)
LOCATION:IRIS 1\,221 & Zoom
DESCRIPTION:Title: Precision collider physics and non-perturbative effects
\n\nAbstract: Recent progress in understanding QCD at the perturbative lev
el led to the possibility to perform precision studies at lepton and even
hadron colliders that go well beyond of what was considered possible earli
er. Given this remarkable progress a question about possible non-perturb
ative effects and their impact on precision collider observables becomes
relevant. In this talk I will discuss a few examples where improved unde
rstanding of non-perturbative effecs in collider physics would be desira
ble\, and describe early attempts to make progress in this direction.\n\
nCoffee\, tea and cookies will be available in the common room before the
colloquium.
CLASS:PUBLIC
CATEGORIES:Seminar
CREATED:20220404T104047Z
DTSTAMP:20220404T104047Z
LAST-MODIFIED:20220607T104101Z
DTSTART;TZID=Europe/Berlin:20220617T140000
DTEND;TZID=Europe/Berlin:20220617T150000
TRANSP:OPAQUE
SEQUENCE:2
END:VEVENT
BEGIN:VEVENT
UID:2C3F-626BA200-7-79EC4C00
SUMMARY:CANCELLED - Prof. Andreas Weiler (TUM\, Munich)
LOCATION:TBA
DESCRIPTION:CANCELLED
CLASS:PUBLIC
CATEGORIES:Seminar
CREATED:20220404T104047Z
DTSTAMP:20220404T104047Z
LAST-MODIFIED:20220628T184405Z
DTSTART;TZID=Europe/Berlin:20220701T140000
DTEND;TZID=Europe/Berlin:20220701T150000
TRANSP:OPAQUE
SEQUENCE:4
END:VEVENT
BEGIN:VEVENT
UID:254172-6347EF00-5-1303D4E0
SUMMARY:Dr. Agnese Bissi (SISSA\, Trieste)
LOCATION:TBA
CLASS:PUBLIC
CATEGORIES:Seminar
X-SOGO-SEND-APPOINTMENT-NOTIFICATIONS:NO
TRANSP:OPAQUE
DTSTART;TZID=Europe/Berlin:20230526T140000
DTEND;TZID=Europe/Berlin:20230526T153000
CREATED:20221010T115501Z
DTSTAMP:20221010T115501Z
LAST-MODIFIED:20221101T133511Z
SEQUENCE:5
DESCRIPTION:Title: TBA\n\nAbstract: TBA
END:VEVENT
BEGIN:VEVENT
UID:C303B-63440800-11-F3D0D50
SUMMARY:Prof. Renate Loll (Radboud University Nijmegen)
LOCATION:IRIS 1\,221
CLASS:PUBLIC
CATEGORIES:Seminar
X-SOGO-SEND-APPOINTMENT-NOTIFICATIONS:NO
TRANSP:OPAQUE
DTSTART;TZID=Europe/Berlin:20221125T140000
DTEND;TZID=Europe/Berlin:20221125T153000
CREATED:20221010T115501Z
DTSTAMP:20221010T115501Z
LAST-MODIFIED:20221118T112935Z
SEQUENCE:2
DESCRIPTION:Title: Quantum Gravity and Quantum Ricci Curvature \n\nAbstract
: Researchers in quantum gravity look for a theoretical and quantitative u
nderstanding of the dynamics of spacetime near the ultrashort Planck scale
\, which is believed to be governed by large quantum fluctuations and ther
efore cannot be described by perturbation theory about solutions to the cl
assical Einstein equations. A powerful nonperturbative methodology is that
of "random geometry"\, the study of continuum limits of statistical ensem
bles of piecewise flat simplicial manifolds consisting of equilateral tria
ngular building blocks. While systems of two-dimensional random geometry i
n Riemannian signature provide analytically soluble toy models and illustr
ate the viability of the method\, physical quantum gravity requires an imp
lementation in four dimensions and Lorentzian signature. \n\nThe formulati
on of Causal Dynamical Triangulations (CDT)\, which builds on the principl
es of random geometry\, is a quantum-gravitational analogue of what lattic
e QCD is to nonabelian gauge theory. It has allowed us to move away from f
ormal considerations in quantum gravity to extracting quantitative results
on the spectra of invariant quantum observables\, describing physics near
the Planck scale. A breakthrough result of CDT quantum gravity in four di
mensions is the emergence\, from first principles\, of a nontrivial\, nonp
erturbative vacuum state with properties of a de Sitter universe. I will s
ummarize these findings\, highlighting the unusual character of observable
s in quantum gravity\, and describe some of the interesting physical quest
ions that are being explored using the new notion of quantum Ricci curvatu
re.
END:VEVENT
X-WR-CALNAME:QFT Colloquium (Prof. Dr. Agostino Patella )
END:VCALENDAR