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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:20190916T205042Z
UID:indico-contribution-68-2162@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Xenia de la Ossa ()\nI review the geometry of hetero
tic string compactifications leading to supersymmetric gauge theories in
4 and 3 dimensions. The data of these compactifications are specified by
a quadruple (Y\, V\, TY\, H) where X is a 6 or 7 dimensional manifold wit
h a G-sturcture (a certain SU(3) structure in 6 dimensions or an integrabl
e G2 structure in 7)\, V is a vector bundle over X with a Yang Mills conne
ction which satisfies instanton constraints\, TY is the tangent bundle ove
r Y with an instanton connection\, and H is a three form on Y defined in t
erms of the B-field and the Chern-Simons forms for the connections on V an
d TY (the so called anomaly condition). We recast all the constraints on
the geometry of these compactifications in terms of an extension bundle Q
over Y which admits a differential which squares to zero. We show that
the tangent space of the moduli space is then given in terms of the first
cohomology group with values in Q. Time permitting\, we discuss the fact
that all our results can be reproduced from a superpotential. We find a K
ahler metric on the moduli space which is a natural inner product on the m
oduli space\, with a Kahler potential taking a remarkably simple form\, an
d as in type II special geometry\, it is quasi-topological.\n\nhttps://ind
ico.mitp.uni-mainz.de/event/68/contributions/2162/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2162/
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:20190916T205042Z
UID:indico-contribution-68-2163@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Kristina Giesel ()\nIn this talk we give a brief rev
iew on the conceptual and mathematical framework underlying loop quantum g
ravity with a focus on its dynamics encoded in the so called quantum Einst
ein equations. We will discuss how the notion of Dirac observables in the
context of general relativity can be used to derive a reduced phase space
quantization for loop quantum gravity. Furthermore\, we explain how the qu
antum Einstein equations can be formulated in this context and discuss som
e recent progress and results.\n\nhttps://indico.mitp.uni-mainz.de/event/6
8/contributions/2163/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2163/
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:20190916T205042Z
UID:indico-contribution-68-2164@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Luise Adams ()\nFeynman integrals are one of the mos
t important tools of pertubation theory for high precision calculations in
particle physics. Due to the presence of ultraviolet or infrared divergen
ces these integrals may require regularisation where the dimensional regul
arisation is commonly used (the regularisation parameter ε denotes the de
viation from the number of space-time dimensions). The result for a Feynma
n integral is then presented as a Laurent series in ε.\nAn interesting qu
estion to ask is which kind of functions appears in the contributions of d
ifferent ε-order.\nIn the ε^0-term of one-loop integrals the logarithm a
nd the dilogarithm occur. Many multi-loop integrals can be expressed in te
rms of generalisations of the logarithm and the dilogarithm\, the so-calle
d multiple polylogarithms. But there are some Feynman integrals which cann
ot be expressed within this class of functions of which the sunrise integr
al is the simplest one.\nIn this talk\, we show how the multiple polylogar
ithms can be generalised to express ε-terms of the Laurent expansion of t
he sunrise integral (for arbitrary masses) around two and four space-time
dimensions. For the two-dimensional equal mass case we will also explain a
n algorithm to compute an arbitrary ε-order of the Laurent expansion.\nRe
cently\, it has been shown that also the equal mass kite integral around f
our space-time dimensions with two massless and three massive propagators
can be expressed in terms of these generalisations.\n\nhttps://indico.mitp
.uni-mainz.de/event/68/contributions/2164/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2164/
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:20190916T205042Z
UID:indico-contribution-68-2165@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Mariana Grana ()\nCompactifications on manifolds who
se size is of the order of the string\nlength reveal purely stringy phenom
ena such as very light modes\ncorresponding to strings winding around the
space. As a consequence\, the\nusual low-energy description of string comp
actifications given by field\ntheory breaks down. In this talk I will revi
ew the basic features of\ncompactifications on tori of string size\, and w
e will see how one can\nget a low-energy effective action from the so-call
ed double field\ntheory.\n\nhttps://indico.mitp.uni-mainz.de/event/68/cont
ributions/2165/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2165/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalised Geometry in String Theory
DTSTART;VALUE=DATE-TIME:20170306T141500Z
DTEND;VALUE=DATE-TIME:20170306T150000Z
DTSTAMP;VALUE=DATE-TIME:20190916T205042Z
UID:indico-contribution-68-2166@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Michela Petrini ()\nhttps://indico.mitp.uni-mainz.de
/event/68/contributions/2166/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2166/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Motives from graphs
DTSTART;VALUE=DATE-TIME:20170310T091500Z
DTEND;VALUE=DATE-TIME:20170310T100000Z
DTSTAMP;VALUE=DATE-TIME:20190916T205042Z
UID:indico-contribution-68-2167@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Susama Agarwala ()\nIn this talk\, I give a differen
t graphical representatioin\n(unrelated to Feynman diagrams) for the numbe
rs that arise as amplitude\ncalculations in QFTs\, i.e. mixed Tate motives
. The graphs in this talk\nare chosen to better illuminate the symmetries
underlying the mixed Tate\nmotives themselves\, with the eventual goal of
understanding their\nstructure.\n\nhttps://indico.mitp.uni-mainz.de/event/
68/contributions/2167/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2167/
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:20190916T205042Z
UID:indico-contribution-68-2168@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Mirjam Cvetic ()\nWe present recent developments in
F-theory compactifications and focus on advances in constructions of globa
lly consistent F-theory compactifications with Abelian and discrete gauge
symmetries\, emphasizing technical advances and insights into higher-rank
gauge symmetries. We also present recent studies of the origin of Abelian
and discrete symmetries in Heterotic/F-theory duality.\n\nhttps://indico.m
itp.uni-mainz.de/event/68/contributions/2168/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2168/
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:20190916T205042Z
UID:indico-contribution-68-2169@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Valentina Forini ()\nString sigma-models relevant
in the AdS/CFT correspondence are highly non-trivial two-dimensiona
l field theories\, for which predictions at finite coupling assum
e integrability and/or the correspondence itself. After having discussed g
eneral features of the perturbative approach\, I will present progress
on how to extract finite coupling information via the use of lattice
field theory methods.\n\nhttps://indico.mitp.uni-mainz.de/event/68/contrib
utions/2169/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2169/
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:20190916T205042Z
UID:indico-contribution-68-2170@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Johanna Knapp ()\nThe mathematics of Calabi-Yau spac
es plays a crucial role in the\ncontext of string compactifications. In th
is talk I discuss the gauged\nlinear sigma model (GLSM)\, which is a super
symmetric gauge theory in two\ndimensions that encodes information about C
alabi-Yaus and their moduli\nspaces. After a basic introduction to GLSMs\,
I will discuss new methods\nfor computing quantum corrections in string c
ompactifications using\nsupersymmetric localization. I will focus in parti
cular on the hemisphere\npartition function\, which computes the quantum c
orrected central charge of\nD-branes on Calabi-Yaus.\n\nhttps://indico.mit
p.uni-mainz.de/event/68/contributions/2170/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2170/
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:20190916T205042Z
UID:indico-contribution-68-2171@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Daniela Cadamuro ()\nThe aim of quantum field theory
(QFT) is to unify quantum theory with the principles of relativity. The p
roblem of a consistent mathematical description\, beyond the level of form
al perturbation theory\, is still open to date\, in particular for many ph
ysically interesting models describing interaction among relativistic part
icles. One mathematical framework for the description of QFT on Minkowski
space is based on the Wightman axioms\, which deal with the notion of quan
tum fields and with unbounded operators\; another framework is the abstrac
t Haag-Kastler setting\, where algebras of bounded operators associated wi
th space-time regions are the fundamental objects. This lecture gives an i
ntroduction to these two frameworks\, and presents an example of such a co
nstruction in a class of interacting quantum field theories on 1+1-dimensi
onal Minkowski space\, the so called quantum integrable models.\n\nhttps:/
/indico.mitp.uni-mainz.de/event/68/contributions/2171/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2171/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Moduli of heterotic G2 compactifications
DTSTART;VALUE=DATE-TIME:20170307T134500Z
DTEND;VALUE=DATE-TIME:20170307T143000Z
DTSTAMP;VALUE=DATE-TIME:20190916T205042Z
UID:indico-contribution-68-2172@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Magdalena Larfors ()\nI will discuss the moduli of h
eterotic compactifications on seven-dimensional manifolds with G2 structur
e with instanton bundles. I will also discuss how such compactifications c
an be used for model building in string theory.\n\nhttps://indico.mitp.uni
-mainz.de/event/68/contributions/2172/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2172/
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:20190916T205042Z
UID:indico-contribution-68-2173@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Anne Taormina (Durham)\nString theory remains to dat
e our best framework to construct a quantum theory that unifies gravity a
nd the other three fundamental forces of Nature. Although it has emerged
as a fantastic arena in which mathematics and physics ideas constantly cro
ss-fertilize\, its credibility relies on the power of its testable predict
ions.\n\n In this talk\, I will review progress made since the defining wo
rk of Candelas\, Horowitz\, Strominger and Witten in 1985 on Calabi-Yau s
tring compactification\, in the quest to predict the mass of quarks and le
ptons\, which mathematically requires the explicit form of the Ricci flat
metric on non-trivial Calabi-Yau manifolds.\n\nhttps://indico.mitp.uni-mai
nz.de/event/68/contributions/2173/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2173/
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:20190916T205042Z
UID:indico-contribution-68-2174@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Antonella Grassi ()\nI will discuss various aspects
of the mathematics and the physics\, especially of F-theory compactificat
ions\, on Calabi-Yau threefolds with singularities.\n\nhttps://indico.mit
p.uni-mainz.de/event/68/contributions/2174/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2174/
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:20190916T205042Z
UID:indico-contribution-68-2176@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Marialuisa Frau ()\nWe study the non-perturbative be
haviour of superconformal gauge theories with rigid N=2 supersymmetry in f
our dimensions\, in particular N=2* theories\, and discuss the relation be
tween their S-duality properties and the possibility of computing exact qu
antum observables. For these theories in fact\, the prepotential function\
, that encodes the low-energy effective dynamics on the Coulomb branch of
moduli space\, and the chiral correlators obey a modular anomaly equation
whose validity is related to S-duality. This fact allow one to write them
in terms of (quasi)-modular forms\, thus resumming all instanton contribut
ions. The results can be checked against the microscopic multi-instanton c
alculus in the case of classical algebras\, but are valid also for the exc
eptional algebras\, where direct computations are not available. We also c
omment on the extension of these techniques to configuration of 4-dimensio
nal N=2 gauge theories in presence of 2-dimensional defects.\n\nhttps://in
dico.mitp.uni-mainz.de/event/68/contributions/2176/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2176/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scattering amplitudes and their singularities
DTSTART;VALUE=DATE-TIME:20170309T100000Z
DTEND;VALUE=DATE-TIME:20170309T113000Z
DTSTAMP;VALUE=DATE-TIME:20190916T205042Z
UID:indico-contribution-68-2178@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Ruth Britto ()\nI will discuss the physical context
in which amplitude calculations are required and describe some techniques
in active development. I focus particularly on singularities and discontin
uities as key tools for exploration and computation. I will describe their
physical interpretations and ways to embed them in algebraic frameworks w
hich can aid in constructing the full amplitudes.\n\nhttps://indico.mitp.u
ni-mainz.de/event/68/contributions/2178/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2178/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Welcome
DTSTART;VALUE=DATE-TIME:20170306T081500Z
DTEND;VALUE=DATE-TIME:20170306T083000Z
DTSTAMP;VALUE=DATE-TIME:20190916T205042Z
UID:indico-contribution-68-2179@indico.mitp.Uni-Mainz.DE
DESCRIPTION:https://indico.mitp.uni-mainz.de/event/68/contributions/2179/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2179/
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:20190916T205042Z
UID:indico-contribution-68-2180@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Karen Yeats ()\nI will set the stage for and explain
what periods of Feynman graphs are and why they should be interesting bot
h to mathematicians and physicists. From there I will focus on some graph
theoretic tools for understanding the resulting number and their symmetri
es.\n\nhttps://indico.mitp.uni-mainz.de/event/68/contributions/2180/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2180/
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:20190916T205042Z
UID:indico-contribution-68-2181@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Mara Ungureanu ()\nEnumerative geometry is an old su
bject with roots in the 19th century\nwhose aim is to count the number of
geometric objects of a certain\ntype that satisfy given conditions. Advan
ces in both mathematics\, and\nunexpectedly\, mathematical physics have le
d to the resolution of many\nof its conjectures and have highlighted new
deep connections between\nmathematics and string theory.\nIn this talk I w
ill describe a classical enumerative problem\, namely\nde Jonquières' cou
nt of certain prescribed hyperplane tangency\nconditions to a smooth curve
embedded in projective space. I will\nthen attempt to explain how this p
roblem relates to certain ergodic\ndynamical systems and ultimately cohomo
logical field theories.\n\nhttps://indico.mitp.uni-mainz.de/event/68/contr
ibutions/2181/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2181/
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:20190916T205042Z
UID:indico-contribution-68-2182@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Catherine Meusburger ()\nWe explain how the concept
of a lattice gauge theory with values in a group can be generalised to a g
auge theory with values in a Hopf algebra on a graph embedded into a surfa
ce. We give an axiomatic description of Hopf algebra gauge theories and s
how that they include the quantum algebra of observables obtained by the c
ombinatorial quantisation of Chern-Simons theory as an example. We relate
Hopf algebra gauge theories to lattice models from condensed matter phys
ics. More specifically\, we show that Kitaev's lattice model for a finite-
dimensional semisimple Hopf algebra H is equivalent to a Hopf algebra gaug
e theory for its Drinfeld double D(H).\n\nhttps://indico.mitp.uni-mainz.de
/event/68/contributions/2182/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/68/contributions/2182/
END:VEVENT
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