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BEGIN:VEVENT
SUMMARY:Moduli space of heterotic string compactifications
DTSTART;VALUE=DATE-TIME:20170306T103000Z
DTEND;VALUE=DATE-TIME:20170306T120000Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-11@cern.ch
DESCRIPTION:Speakers: DE LA OSSA\, Xenia ()\nI review the geometry of hete
rotic string compactifications leading to supersymmetric gauge theories in
4 and 3 dimensions. The data of these compactifications are specified b
y a quadruple (Y\, V\, TY\, H) where X is a 6 or 7 dimensional manifold w
ith a G-sturcture (a certain SU(3) structure in 6 dimensions or an integra
ble G2 structure in 7)\, V is a vector bundle over X with a Yang Mills con
nection which satisfies instanton constraints\, TY is the tangent bundle o
ver Y with an instanton connection\, and H is a three form on Y defined in
terms of the B-field and the Chern-Simons forms for the connections on V
and TY (the so called anomaly condition). We recast all the constraints o
n the geometry of these compactifications in terms of an extension bundle
Q over Y which admits a differential which squares to zero. We show tha
t the tangent space of the moduli space is then given in terms of the firs
t cohomology group with values in Q. Time permitting\, we discuss the fac
t that all our results can be reproduced from a superpotential. We find a
Kahler metric on the moduli space which is a natural inner product on the
moduli space\, with a Kahler potential taking a remarkably simple form\,
and as in type II special geometry\, it is quasi-topological.\n\nhttps://i
ndico.mitp.uni-mainz.de/event/68/contribution/11
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/11
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Einstein Equations of Loop Quantum Gravity
DTSTART;VALUE=DATE-TIME:20170308T130000Z
DTEND;VALUE=DATE-TIME:20170308T134500Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-25@cern.ch
DESCRIPTION:Speakers: GIESEL\, Kristina ()\nIn this talk we give a brief r
eview on the conceptual and mathematical framework underlying loop quantum
gravity with a focus on its dynamics encoded in the so called quantum Ein
stein equations. We will discuss how the notion of Dirac observables in th
e context of general relativity can be used to derive a reduced phase spac
e quantization for loop quantum gravity. Furthermore\, we explain how the
quantum Einstein equations can be formulated in this context and discuss s
ome recent progress and results.\n\nhttps://indico.mitp.uni-mainz.de/event
/68/contribution/25
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/25
END:VEVENT
BEGIN:VEVENT
SUMMARY:An elliptic generalisation of polylogarithms for the sunrise and t
he kite integral
DTSTART;VALUE=DATE-TIME:20170309T134500Z
DTEND;VALUE=DATE-TIME:20170309T143000Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-13@cern.ch
DESCRIPTION:Speakers: ADAMS\, Luise ()\nFeynman integrals are one of the m
ost important tools of pertubation theory for high precision calculations
in particle physics. Due to the presence of ultraviolet or infrared diverg
ences these integrals may require regularisation where the dimensional reg
ularisation is commonly used (the regularisation parameter ε denotes the
deviation from the number of space-time dimensions). The result for a Feyn
man integral is then presented as a Laurent series in ε.\nAn interesting
question to ask is which kind of functions appears in the contributions of
different ε-order.\nIn the ε^0-term of one-loop integrals the logarithm
and the dilogarithm occur. Many multi-loop integrals can be expressed in
terms of generalisations of the logarithm and the dilogarithm\, the so-cal
led multiple polylogarithms. But there are some Feynman integrals which ca
nnot be expressed within this class of functions of which the sunrise inte
gral is the simplest one.\nIn this talk\, we show how the multiple polylog
arithms can be generalised to express ε-terms of the Laurent expansion of
the sunrise integral (for arbitrary masses) around two and four space-tim
e dimensions. For the two-dimensional equal mass case we will also explain
an algorithm to compute an arbitrary ε-order of the Laurent expansion.\n
Recently\, it has been shown that also the equal mass kite integral around
four space-time dimensions with two massless and three massive propagator
s can be expressed in terms of these generalisations.\n\nhttps://indico.mi
tp.uni-mainz.de/event/68/contribution/13
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/13
END:VEVENT
BEGIN:VEVENT
SUMMARY:String compactifications on string-size tori from double field the
ory
DTSTART;VALUE=DATE-TIME:20170306T133000Z
DTEND;VALUE=DATE-TIME:20170306T141500Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-12@cern.ch
DESCRIPTION:Speakers: GRANA\, Mariana ()\nCompactifications on manifolds w
hose size is of the order of the string\nlength reveal purely stringy phen
omena such as very light modes\ncorresponding to strings winding around th
e space. As a consequence\, the\nusual low-energy description of string co
mpactifications given by field\ntheory breaks down. In this talk I will re
view the basic features of\ncompactifications on tori of string size\, and
we will see how one can\nget a low-energy effective action from the so-ca
lled double field\ntheory.\n\nhttps://indico.mitp.uni-mainz.de/event/68/co
ntribution/12
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/12
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalised Geometry in String Theory
DTSTART;VALUE=DATE-TIME:20170306T141500Z
DTEND;VALUE=DATE-TIME:20170306T150000Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-20@cern.ch
DESCRIPTION:Speakers: PETRINI\, Michela ()\nhttps://indico.mitp.uni-mainz.
de/event/68/contribution/20
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/20
END:VEVENT
BEGIN:VEVENT
SUMMARY:Motives from graphs
DTSTART;VALUE=DATE-TIME:20170310T091500Z
DTEND;VALUE=DATE-TIME:20170310T100000Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-21@cern.ch
DESCRIPTION:Speakers: AGARWALA\, Susama ()\nIn this talk\, I give a differ
ent graphical representatioin\n(unrelated to Feynman diagrams) for the num
bers that arise as amplitude\ncalculations in QFTs\, i.e. mixed Tate motiv
es. The graphs in this talk\nare chosen to better illuminate the symmetrie
s underlying the mixed Tate\nmotives themselves\, with the eventual goal o
f understanding their\nstructure.\n\nhttps://indico.mitp.uni-mainz.de/even
t/68/contribution/21
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/21
END:VEVENT
BEGIN:VEVENT
SUMMARY:Continuous and Discrete Gauge Symmetries in F-Theory
DTSTART;VALUE=DATE-TIME:20170310T103000Z
DTEND;VALUE=DATE-TIME:20170310T113000Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-22@cern.ch
DESCRIPTION:Speakers: CVETIC\, Mirjam ()\nWe present recent developments i
n F-theory compactifications and focus on advances in constructions of glo
bally consistent F-theory compactifications with Abelian and discrete gaug
e symmetries\, emphasizing technical advances and insights into higher-ran
k gauge symmetries. We also present recent studies of the origin of Abelia
n and discrete symmetries in Heterotic/F-theory duality.\n\nhttps://indico
.mitp.uni-mainz.de/event/68/contribution/22
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/22
END:VEVENT
BEGIN:VEVENT
SUMMARY:Worldsheet string theory in AdS/CFT: perturbation theo
ry and beyond
DTSTART;VALUE=DATE-TIME:20170308T134500Z
DTEND;VALUE=DATE-TIME:20170308T143000Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-23@cern.ch
DESCRIPTION:Speakers: FORINI\, Valentina ()\nString sigma-models relevan
t in the AdS/CFT correspondence are highly non-trivial two-dimensio
nal field theories\, for which predictions at finite coupling ass
ume integrability and/or the correspondence itself. After having discussed
general features of the perturbative approach\, I will present progres
s on how to extract finite coupling information via the use of lattice
field theory methods.\n\nhttps://indico.mitp.uni-mainz.de/event/68/contr
ibution/23
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/23
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calabi-Yaus and supersymmetric gauge theory
DTSTART;VALUE=DATE-TIME:20170307T083000Z
DTEND;VALUE=DATE-TIME:20170307T100000Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-19@cern.ch
DESCRIPTION:Speakers: KNAPP\, Johanna ()\nThe mathematics of Calabi-Yau sp
aces plays a crucial role in the\ncontext of string compactifications. In
this talk I discuss the gauged\nlinear sigma model (GLSM)\, which is a sup
ersymmetric gauge theory in two\ndimensions that encodes information about
Calabi-Yaus and their moduli\nspaces. After a basic introduction to GLSMs
\, I will discuss new methods\nfor computing quantum corrections in string
compactifications using\nsupersymmetric localization. I will focus in par
ticular on the hemisphere\npartition function\, which computes the quantum
corrected central charge of\nD-branes on Calabi-Yaus.\n\nhttps://indico.m
itp.uni-mainz.de/event/68/contribution/19
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/19
END:VEVENT
BEGIN:VEVENT
SUMMARY:Locality of observables in quantum field theory
DTSTART;VALUE=DATE-TIME:20170308T100000Z
DTEND;VALUE=DATE-TIME:20170308T113000Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-16@cern.ch
DESCRIPTION:Speakers: CADAMURO\, Daniela ()\nThe aim of quantum field theo
ry (QFT) is to unify quantum theory with the principles of relativity. The
problem of a consistent mathematical description\, beyond the level of fo
rmal perturbation theory\, is still open to date\, in particular for many
physically interesting models describing interaction among relativistic pa
rticles. One mathematical framework for the description of QFT on Minkowsk
i space is based on the Wightman axioms\, which deal with the notion of qu
antum fields and with unbounded operators\; another framework is the abstr
act Haag-Kastler setting\, where algebras of bounded operators associated
with space-time regions are the fundamental objects. This lecture gives an
introduction to these two frameworks\, and presents an example of such a
construction in a class of interacting quantum field theories on 1+1-dimen
sional Minkowski space\, the so called quantum integrable models.\n\nhttps
://indico.mitp.uni-mainz.de/event/68/contribution/16
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/16
END:VEVENT
BEGIN:VEVENT
SUMMARY:Moduli of heterotic G2 compactifications
DTSTART;VALUE=DATE-TIME:20170307T134500Z
DTEND;VALUE=DATE-TIME:20170307T143000Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-10@cern.ch
DESCRIPTION:Speakers: LARFORS\, Magdalena ()\nI will discuss the moduli of
heterotic compactifications on seven-dimensional manifolds with G2 struct
ure with instanton bundles. I will also discuss how such compactifications
can be used for model building in string theory.\n\nhttps://indico.mitp.u
ni-mainz.de/event/68/contribution/10
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/10
END:VEVENT
BEGIN:VEVENT
SUMMARY:Physical predictions through string compactification: challenges a
nd hopes
DTSTART;VALUE=DATE-TIME:20170306T083000Z
DTEND;VALUE=DATE-TIME:20170306T100000Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-3@cern.ch
DESCRIPTION:Speakers: TAORMINA\, Anne (Durham)\nString theory remains to d
ate our best framework to construct a quantum theory that unifies gravity
and the other three fundamental forces of Nature. Although it has emerge
d as a fantastic arena in which mathematics and physics ideas constantly c
ross-fertilize\, its credibility relies on the power of its testable predi
ctions.\n\n In this talk\, I will review progress made since the defining
work of Candelas\, Horowitz\, Strominger and Witten in 1985 on Calabi-Yau
string compactification\, in the quest to predict the mass of quarks and
leptons\, which mathematically requires the explicit form of the Ricci fla
t metric on non-trivial Calabi-Yau manifolds.\n\nhttps://indico.mitp.uni-m
ainz.de/event/68/contribution/3
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/3
END:VEVENT
BEGIN:VEVENT
SUMMARY:Singularities in F-theory compactifications\, algebraic geometry a
nd topology
DTSTART;VALUE=DATE-TIME:20170307T103000Z
DTEND;VALUE=DATE-TIME:20170307T113000Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-5@cern.ch
DESCRIPTION:Speakers: GRASSI\, Antonella ()\nI will discuss various aspect
s of the mathematics and the physics\, especially of F-theory compactific
ations\, on Calabi-Yau threefolds with singularities.\n\nhttps://indico.m
itp.uni-mainz.de/event/68/contribution/5
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/5
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exact results in N=2 Super Yang-Mills Theories
DTSTART;VALUE=DATE-TIME:20170307T130000Z
DTEND;VALUE=DATE-TIME:20170307T134500Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-7@cern.ch
DESCRIPTION:Speakers: FRAU\, Marialuisa ()\nWe study the non-perturbative
behaviour of superconformal gauge theories with rigid N=2 supersymmetry in
four dimensions\, in particular N=2* theories\, and discuss the relation
between their S-duality properties and the possibility of computing exact
quantum observables. For these theories in fact\, the prepotential functio
n\, that encodes the low-energy effective dynamics on the Coulomb branch o
f moduli space\, and the chiral correlators obey a modular anomaly equatio
n whose validity is related to S-duality. This fact allow one to write the
m in terms of (quasi)-modular forms\, thus resumming all instanton contrib
utions. The results can be checked against the microscopic multi-instanton
calculus in the case of classical algebras\, but are valid also for the e
xceptional algebras\, where direct computations are not available. We also
comment on the extension of these techniques to configuration of 4-dimens
ional N=2 gauge theories in presence of 2-dimensional defects.\n\nhttps://
indico.mitp.uni-mainz.de/event/68/contribution/7
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/7
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scattering amplitudes and their singularities
DTSTART;VALUE=DATE-TIME:20170309T100000Z
DTEND;VALUE=DATE-TIME:20170309T113000Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-9@cern.ch
DESCRIPTION:Speakers: BRITTO\, Ruth ()\nI will discuss the physical contex
t in which amplitude calculations are required and describe some technique
s in active development. I focus particularly on singularities and discont
inuities as key tools for exploration and computation. I will describe the
ir physical interpretations and ways to embed them in algebraic frameworks
which can aid in constructing the full amplitudes.\n\nhttps://indico.mitp
.uni-mainz.de/event/68/contribution/9
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/9
END:VEVENT
BEGIN:VEVENT
SUMMARY:Welcome
DTSTART;VALUE=DATE-TIME:20170306T081500Z
DTEND;VALUE=DATE-TIME:20170306T083000Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-15@cern.ch
DESCRIPTION:Speakers: \nhttps://indico.mitp.uni-mainz.de/event/68/contribu
tion/15
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/15
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numbers and patterns in Feynman graphs
DTSTART;VALUE=DATE-TIME:20170309T080000Z
DTEND;VALUE=DATE-TIME:20170309T093000Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-17@cern.ch
DESCRIPTION:Speakers: YEATS\, Karen ()\nI will set the stage for and expla
in what periods of Feynman graphs are and why they should be interesting b
oth to mathematicians and physicists. From there I will focus on some gra
ph theoretic tools for understanding the resulting number and their symmet
ries.\n\nhttps://indico.mitp.uni-mainz.de/event/68/contribution/17
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/17
END:VEVENT
BEGIN:VEVENT
SUMMARY:From de Jonquières' counts to cohomological field theory
DTSTART;VALUE=DATE-TIME:20170309T130000Z
DTEND;VALUE=DATE-TIME:20170309T134500Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-14@cern.ch
DESCRIPTION:Speakers: UNGUREANU\, Mara ()\nEnumerative geometry is an old
subject with roots in the 19th century\nwhose aim is to count the number o
f geometric objects of a certain\ntype that satisfy given conditions. Adv
ances in both mathematics\, and\nunexpectedly\, mathematical physics have
led to the resolution of many\nof its conjectures and have highlighted ne
w deep connections between\nmathematics and string theory.\nIn this talk I
will describe a classical enumerative problem\, namely\nde Jonquières' c
ount of certain prescribed hyperplane tangency\nconditions to a smooth cur
ve embedded in projective space. I will\nthen attempt to explain how this
problem relates to certain ergodic\ndynamical systems and ultimately coho
mological field theories.\n\nhttps://indico.mitp.uni-mainz.de/event/68/con
tribution/14
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/14
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hopf algebra gauge theories on embedded graphs
DTSTART;VALUE=DATE-TIME:20170308T080000Z
DTEND;VALUE=DATE-TIME:20170308T093000Z
DTSTAMP;VALUE=DATE-TIME:20170623T084223Z
UID:indico-contribution-68-8@cern.ch
DESCRIPTION:Speakers: MEUSBURGER\, Catherine ()\nWe explain how the concep
t of a lattice gauge theory with values in a group can be generalised to a
gauge theory with values in a Hopf algebra on a graph embedded into a sur
face. We give an axiomatic description of Hopf algebra gauge theories and
show that they include the quantum algebra of observables obtained by the
combinatorial quantisation of Chern-Simons theory as an example. We rela
te Hopf algebra gauge theories to lattice models from condensed matter ph
ysics. More specifically\, we show that Kitaev's lattice model for a finit
e-dimensional semisimple Hopf algebra H is equivalent to a Hopf algebra ga
uge theory for its Drinfeld double D(H).\n\nhttps://indico.mitp.uni-mainz.
de/event/68/contribution/8
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contribution/8
END:VEVENT
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