BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Supersymmetric gauge theories and geometric representation theory
DTSTART;VALUE=DATE-TIME:20170601T093000Z
DTEND;VALUE=DATE-TIME:20170601T103000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2315@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Richard Szabo (Heriot-Watt University)\nhttps://indi
co.mitp.uni-mainz.de/event/76/contributions/2315/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2315/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hopf algebra gauge theories on ribbon graphs
DTSTART;VALUE=DATE-TIME:20170601T123000Z
DTEND;VALUE=DATE-TIME:20170601T133000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2316@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Catherine Meusburger (Universität Erlangen)\nWe exp
lain how the concept 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 surface. We give an axiomatic description of Hopf algebra
gauge theories and show that they include the quantum algebra of observabl
es obtained by the combinatorial quantisation of Chern-Simons theory. We r
elate Hopf algebra gauge theories to lattice models from condensed matter
physics. More specifically\, we show that Kitaev's lattice model for a fin
ite-dimensional semisimple Hopf algebra H is equivalent to a Hopf algebra
gauge theory for its Drinfeld double D(H).\n\nhttps://indico.mitp.uni-main
z.de/event/76/contributions/2316/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2316/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coffee Break
DTSTART;VALUE=DATE-TIME:20170601T133000Z
DTEND;VALUE=DATE-TIME:20170601T140000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2317@indico.mitp.Uni-Mainz.DE
DESCRIPTION:https://indico.mitp.uni-mainz.de/event/76/contributions/2317/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2317/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Weyl quantization for gauge theories in terms of projective limits
of graphs
DTSTART;VALUE=DATE-TIME:20170601T140000Z
DTEND;VALUE=DATE-TIME:20170601T144500Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2318@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Alexander Stottmeister (University of Rome "Tor Verg
ata")\nWeyl quantization and an adapted pseudo-differential calculus may s
erve as powerful tool to discuss the semi-classical limit of quantum syste
m. We will present results regarding the construction of a Weyl quantizati
on for gauge theories defined via projective limits of (finite) graphs. Mo
reover\, we will approach the problem of defining associated symbol spaces
and their pseudo-differential calculus.\n\nhttps://indico.mitp.uni-mainz.
de/event/76/contributions/2318/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2318/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scattering of atoms and non-locality of the vacuum in QED
DTSTART;VALUE=DATE-TIME:20170531T140000Z
DTEND;VALUE=DATE-TIME:20170531T144500Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2319@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Maximilan Duell (Technische Universität München)\n
In the non-perturbative setting of algebraic QFT we give a mathematically
rigorous construction of the scattering matrix for massive Wigner particle
s in presence of massless excitations. In contrast to previous approaches
we do not impose any Herbst-type technical assumptions on the spectrum of
the mass operator near the particle masses. Instead we base our approach o
n features of the relativistic vacuum state which are similar to the well-
established\nReeh-Schlieder property. The method should apply\, in particu
lar\, to scattering of stable particles in abelian gauge theories. A concr
ete example are hydrogen atoms from the point of view of Quantum Electrody
namics.\n(Based on https://arxiv.org/abs/1603.07512\, to appear in CMP)\n\
nhttps://indico.mitp.uni-mainz.de/event/76/contributions/2319/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2319/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Extending the algebraic construction of integrable QFTs
DTSTART;VALUE=DATE-TIME:20170531T150000Z
DTEND;VALUE=DATE-TIME:20170531T154500Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2320@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Daniela Cadamuro (Technische Universität München)\
narious integrable models of QFT have been recently constructed in a mathe
matical satisfactory way by means of operator-algebraic techniques. Some o
f these\, such as the O(N)-invariant nonlinear sigma models\, can be seen
as a toy model for 4-dimensional nonabelian gauge theories. It would be ph
ysically even more interesting to consider gauge theories with bound state
s\, where moreover we allow fusions among particles. Examples of interesti
ng integrable models in this respect are the sine-Gordon and the Thirring
models. This talk will report on ongoing work regarding the mathematical c
onstruction of such models\, and explore their relevance for physics.\n\nh
ttps://indico.mitp.uni-mainz.de/event/76/contributions/2320/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2320/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higher structures in Dijkgraaf-Witten theories
DTSTART;VALUE=DATE-TIME:20170601T080000Z
DTEND;VALUE=DATE-TIME:20170601T090000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2321@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Christoph Schweigert (Universität Hamburg)\nDijkgra
af-Witten theories are fully extended topological field theories that are
constructed using gauge-theoretic principles for a gauge theory based on a
finite group. They provide a laboratory linking questions in gauge theory
\, representation theory and (higher) category theory. We present some asp
ect of these theories\, emphasizing defects of any codimension\n\nhttps://
indico.mitp.uni-mainz.de/event/76/contributions/2321/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2321/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coffee Break
DTSTART;VALUE=DATE-TIME:20170601T090000Z
DTEND;VALUE=DATE-TIME:20170601T093000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2322@indico.mitp.Uni-Mainz.DE
DESCRIPTION:https://indico.mitp.uni-mainz.de/event/76/contributions/2322/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2322/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-existence of natural states for Abelian Chern-Simons theory
DTSTART;VALUE=DATE-TIME:20170529T150000Z
DTEND;VALUE=DATE-TIME:20170529T154500Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2323@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Simone Murro (Universität Regensburg)\nWe give an e
lementary proof that Abelian Chern-Simons theory\, described as a functor
from oriented surfaces to C*-algebras\, does not admit a natural state. No
n-existence of natural states is thus not only a phenomenon of quantum fie
ld theories on Lorentzian manifolds\, but also of topological quantum fiel
d theories formulated in the algebraic approach.\n\nhttps://indico.mitp.un
i-mainz.de/event/76/contributions/2323/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2323/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A noncommutative approach to the quantisation of lattice gauge the
ories
DTSTART;VALUE=DATE-TIME:20170602T080000Z
DTEND;VALUE=DATE-TIME:20170602T090000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2324@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Francesca Arici (University of Nijmegen)\nWe will de
scribe the quantisation of gauge theories on a lattice/graph in terms of t
heir algebras of observables and of the Hilbert space on which the algebra
is represented. The algebra of observables for the quantum system admits
a natural geometric realization as a groupoid\nC*-algebra. We will study t
he behaviour of such algebras under lattice refinements and the resulting
continuum limit of the theory.\n\nBased on joint work with R. Stienstra an
d W. van Suijlekom.\n\nhttps://indico.mitp.uni-mainz.de/event/76/contribut
ions/2324/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2324/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Viability of the Asymptotic Safety scenario beyond renormalizabili
ty?
DTSTART;VALUE=DATE-TIME:20170529T080000Z
DTEND;VALUE=DATE-TIME:20170529T090000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2325@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Martin Reuter (Universität Mainz)\nThe talk will in
clude a general introduction to the main ideas of the Asymptotic Safety ap
proach to quantum gravity. This program aims at finding an acceptable quan
tum field theory of gravity and spacetime geometry which complies with a n
umber of indispensable physical principles such as Hilbert space positivit
y and background independence in addition to (nonperturbative) renormaliza
bility. We discuss some of these requirements in a simplified two-dimensio
nal setting where the tools of conformal field theory are available.\n\nht
tps://indico.mitp.uni-mainz.de/event/76/contributions/2325/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2325/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Welcome Address
DTSTART;VALUE=DATE-TIME:20170529T075000Z
DTEND;VALUE=DATE-TIME:20170529T080000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2326@indico.mitp.Uni-Mainz.DE
DESCRIPTION:https://indico.mitp.uni-mainz.de/event/76/contributions/2326/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2326/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Weak signals of quantum spacetime from electromagnetic interaction
s of neutral dark matter
DTSTART;VALUE=DATE-TIME:20170529T093000Z
DTEND;VALUE=DATE-TIME:20170529T103000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2327@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Gerardo Morsella (University of Rome "Tor Vergata")\
nOn DFR quantum spacetime a U(1) gauge theory turns into a gauge theory ba
sed on the noncommutative group of unitaries of the DFR C*-algebra\, and t
his implies that classical electrodynamics becomes an interacting theory a
nd that also neutral particles can have non-trivial interaction with the e
lectromagnetic field. This effect can serve therefore as an observable sig
nature of quantum spacetime with relatively low background. We analyze thi
s interaction and give some order of magnitude estimates for the radiation
emitted by possible compact astrophysical objects of neutral dark matter.
(Joint work with S. Doplicher\, K. Fredenhagen\, N. Pinamonti.)\n\nhttps:
//indico.mitp.uni-mainz.de/event/76/contributions/2327/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2327/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coffee Break
DTSTART;VALUE=DATE-TIME:20170529T090000Z
DTEND;VALUE=DATE-TIME:20170529T093000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2328@indico.mitp.Uni-Mainz.DE
DESCRIPTION:https://indico.mitp.uni-mainz.de/event/76/contributions/2328/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2328/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coffee Break
DTSTART;VALUE=DATE-TIME:20170529T133000Z
DTEND;VALUE=DATE-TIME:20170529T140000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2329@indico.mitp.Uni-Mainz.DE
DESCRIPTION:https://indico.mitp.uni-mainz.de/event/76/contributions/2329/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2329/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stability of thermal states in perturbative algebraic quantum fiel
d theory
DTSTART;VALUE=DATE-TIME:20170601T150000Z
DTEND;VALUE=DATE-TIME:20170601T154500Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2330@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Federico Faldino (University of Genoa)\nIn this talk
we discuss the stability properties shown by KMS states for interacting m
assive scalar fields propagating over Minkowski spacetime. These states ha
ve been recently constructed in the framework of perturbative algebraic qu
antum field theories.\n\nhttps://indico.mitp.uni-mainz.de/event/76/contrib
utions/2330/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2330/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An IDEAL characterization of FLRW spacetimes
DTSTART;VALUE=DATE-TIME:20170529T123000Z
DTEND;VALUE=DATE-TIME:20170529T133000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2331@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Igor Khavkine (University of Milan)\nAn IDEAL (Intri
nsic\, Deductive\, Explicit\, ALgorithmic) characterization of a reference
spacetime metric $g_0$ consists of a set of tensorial equations $T[g]=0$\
, constructed covariantly out of the metric $g$\, its Riemann curvature an
d their derivatives\, that are satisfied if and only if $g$ is locally iso
metric to the reference spacetime metric $g_0$. The same notion can be ext
ended to include matter fields\, where the equations $T[g\,phi]=0$ are all
owed to also depend on the matter fields $phi$. We will present the first
IDEAL characterization of cosmological FLRW spacetimes\, with and without
a dynamical scalar field. The solution of this problem also has implicatio
ns for the construction of local gauge invariant observables for cosmologi
cal perturbations. Namely\, by construction\, the linearization $dot{T}[g_
0\,phi_0\; delta g\, delta phi]$ about $(g\,phi) mapsto (g_0 + delta g\, p
hi_0 + deltaphi)$ gives a complete set of local gauge invariant field comb
inations for cosmological perturbations. This is joint work with G. Canepa
.\n\nhttps://indico.mitp.uni-mainz.de/event/76/contributions/2331/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2331/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hyperbolic Differential Complexes
DTSTART;VALUE=DATE-TIME:20170529T140000Z
DTEND;VALUE=DATE-TIME:20170529T144500Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2332@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Pedro Lauridsen Ribeiro (University of Sao Paolo)\nC
omplexes of differential operators are a concept of great importance in se
veral areas of mathematics. Particularly\, elliptic differential complexes
play a fundamental role in the theory of the index of elliptic operators
put forward by Atiyah\, Singer and others in the sixties\, whose relevance
in analysis\, geometry and topology is well known. Much less developed is
a similar theory for complexes of hyperbolic partial differential operato
rs\, which are of utmost importance for formulating the dynamics of relati
vistic field theories with constraints and/or gauge symmetries. In this ta
lk\, we shall present a few steps towards such a theory\, partly based on
a former proposal by MacKichan (1975). Our main focus will be how to prope
rly formulate and prove well-posedness of the Cauchy problem for such comp
lexes\, and how this theory elegantly encodes both constraints and gauge s
ymmetries. Connections to the BV-BRST formalism for gauge- theoretic field
models and possible extensions to nonlinear systems will also be discusse
d\, if time allows. (joint work with Michael Forger)\n\nhttps://indico.mit
p.uni-mainz.de/event/76/contributions/2332/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2332/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coffee Break
DTSTART;VALUE=DATE-TIME:20170530T090000Z
DTEND;VALUE=DATE-TIME:20170530T093000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2333@indico.mitp.Uni-Mainz.DE
DESCRIPTION:https://indico.mitp.uni-mainz.de/event/76/contributions/2333/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2333/
END:VEVENT
BEGIN:VEVENT
SUMMARY:From factorization algebras to twisted functorial field theories -
the topological case
DTSTART;VALUE=DATE-TIME:20170530T080000Z
DTEND;VALUE=DATE-TIME:20170530T090000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2334@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Claudia Scheimbauer (University of Oxford)\nAfter re
calling functorial field theories a la Atiyah-Segal I will explain a natur
al generalization thereof\, called "twisted" field theories by Stolz-Teich
ner and closely related to Freed-Teleman's "relative" boundary field theor
ies. Focussing on the topological “extended” case\, I will explain how
to obtain some examples\, in particular some arising from factorization a
lgebras.\n\nhttps://indico.mitp.uni-mainz.de/event/76/contributions/2334/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2334/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards homotopical algebraic quantum field theory
DTSTART;VALUE=DATE-TIME:20170530T123000Z
DTEND;VALUE=DATE-TIME:20170530T133000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2335@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Alexander Schenkel (University of Nottingham)\nAn al
gebraic quantum field theory is an assignment of algebras to spacetimes. T
hese algebras should be interpreted as quantizations of the algebras of fu
nctions on the moduli spaces of a classical field theory. In many cases of
interest\, especially in gauge theories\, these moduli spaces are not con
ventional spaces but `higher spaces' called stacks. Consequently\, functio
ns on such spaces do not form an algebra but a `higher algebra' which one
may describe by homotopical algebra. This motivates us to study assignment
s of `higher algebras' to spacetimes\, which is what I call homotopical al
gebraic quantum field theory. In this talk I will clarify the above pictur
e and explain its advantages compared to traditional algebraic quantum fie
ld theory. For this I will also present simple toy-models related to Abeli
an gauge theory and homotopy Kan extensions.\n\nhttps://indico.mitp.uni-ma
inz.de/event/76/contributions/2335/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2335/
END:VEVENT
BEGIN:VEVENT
SUMMARY:BV formalism in functorial QFT in Lorentzian and Euclidean signatu
re
DTSTART;VALUE=DATE-TIME:20170530T093000Z
DTEND;VALUE=DATE-TIME:20170530T103000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2336@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Kasia Rejzner (University of York)\nIn this talk I w
ill outline how the Batalin-Vilkoviski (BV) formalism can be used to quant
ize gauge theories and effective quantum gravity in Lorentzian signature\,
in the framework of locally covariant QFT. I will also present recent res
ults on relations of this framework to the approach of Costello that opera
tes in Euclidean signature.\n\nhttps://indico.mitp.uni-mainz.de/event/76/c
ontributions/2336/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2336/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Background-independence in gauge theories
DTSTART;VALUE=DATE-TIME:20170530T140000Z
DTEND;VALUE=DATE-TIME:20170530T144500Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2337@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Mojtaba Taslimitehrani (Universität Leipzig)\nClass
ical Yang-Mills theory is background-independent in the sense that splitti
ng the gauge connection into a background connection and a dynamical vecto
r potential is a symmetry of the theory. I will talk about a definition o
f background independence in (perturbative) quantum YM\ntheory\, that is t
he preservation of this symmetry at the quantum level. In a geometrical fo
rmulation\, we define background-independent observables as flat sections
of an algebra bundle over the manifold of background configurations\, with
respect to a flat connection which implements background variations. It t
urns out that background independence at the quantum level is in general v
iolated by potential obstructions. I will discuss such obstructions for YM
theory and will remark on perturbative quantum gravity. (Joint work with
Jochen Zahn).\n\nhttps://indico.mitp.uni-mainz.de/event/76/contributions/2
337/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2337/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coffee Break
DTSTART;VALUE=DATE-TIME:20170530T133000Z
DTEND;VALUE=DATE-TIME:20170530T140000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2338@indico.mitp.Uni-Mainz.DE
DESCRIPTION:https://indico.mitp.uni-mainz.de/event/76/contributions/2338/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2338/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The locally convex Weyl algebra
DTSTART;VALUE=DATE-TIME:20170531T080000Z
DTEND;VALUE=DATE-TIME:20170531T090000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2339@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Stefan Waldmann (Universität Würzburg)\nIn my talk
I will report on recent progesses in understanding the convergence\nprope
rties of certain examples of star products. For the Weyl-Moyal star\nprodu
cts on a Poisson vector space and its variations one obtains a\nquantizati
on for a large class of real-analytic functions leading to a locally\nconv
ex algebra containing elements with canonical commutation relations\nspeci
fied by the constant Poisson structure. Depending on the analytic\npropert
ies of the Poisson vector space\, the resulting algebra has many nice\npro
perties which I will point out. The analytic structure of the algebra then
\nhelps to prove self-adjointness of linear and quadratic elements in all
GNS\nrepresentations in a very systematic way. Applications to quantum fie
ld theory\narise when the underlying Poisson vector space is the space of
solutions to\nlinear wave equations.\n\nhttps://indico.mitp.uni-mainz.de/e
vent/76/contributions/2339/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2339/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A perturbative renormalizability of SU(2) Yang-Mills theory in fou
r-dimensional Euclidean space which is based on the Flow Equations of the
renormalization group
DTSTART;VALUE=DATE-TIME:20170530T150000Z
DTEND;VALUE=DATE-TIME:20170530T154500Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2340@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Alexander Efremov (University of Paris)\nhttps://ind
ico.mitp.uni-mainz.de/event/76/contributions/2340/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2340/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological charges and spacelike linearity in QED
DTSTART;VALUE=DATE-TIME:20170531T093000Z
DTEND;VALUE=DATE-TIME:20170531T103000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2341@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Giuseppe Ruzzi (University of Rome "Tor Vergata")\nW
e present some recent results on the universal C*-algebra of the electroma
gnetic quantum field which is represented in any theory describing the ele
ctromagnetic field. We discuss the appearance of a new kind of topological
charges described by a pair of fields localized in certain topologically
non-trivial and spacelike separated regions.\n\nhttps://indico.mitp.uni-ma
inz.de/event/76/contributions/2341/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2341/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coffee Break
DTSTART;VALUE=DATE-TIME:20170531T090000Z
DTEND;VALUE=DATE-TIME:20170531T093000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2342@indico.mitp.Uni-Mainz.DE
DESCRIPTION:https://indico.mitp.uni-mainz.de/event/76/contributions/2342/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2342/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coffee Break
DTSTART;VALUE=DATE-TIME:20170531T133000Z
DTEND;VALUE=DATE-TIME:20170531T140000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2343@indico.mitp.Uni-Mainz.DE
DESCRIPTION:https://indico.mitp.uni-mainz.de/event/76/contributions/2343/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2343/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-relativistic QED in different gauges
DTSTART;VALUE=DATE-TIME:20170531T123000Z
DTEND;VALUE=DATE-TIME:20170531T133000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2344@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Wojciech Dybalski (Technische Universität München)
\nOne consequence of local gauge symmetry in QED is the conservation of th
e spacelike asymptotic flux of the electric field. It is an old conjecture
that this quantity depends on the gauge fixing in the quantization proced
ure. In this talk I will discuss this problem in a non-relativistic model
of QED. I will show how to pass from the usual Coulomb gauge to the axial
gauge\, compute the flux in both cases and give arguments in favour of the
above conjecture.\n\nhttps://indico.mitp.uni-mainz.de/event/76/contributi
ons/2344/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2344/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Massive vector bosons: an indication for non-compatibility of the
Higgs mechanism with the renormalization group flow
DTSTART;VALUE=DATE-TIME:20170602T093000Z
DTEND;VALUE=DATE-TIME:20170602T101500Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2345@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Speakers: Michael Dütsch (Universität Göttingen)\nPart I. T
he Higgs mechanism is not needed: this is shown by giving a consistent qua
ntization of massive vector bosons without using the Higgs mechanism.\n\nP
art II. Compatibility of the Higgs mechanism with the RG-flow: the Higgs m
echanism implies that the prefactors of the various interaction terms are
uniquely determined functions of the coupling constant(s) and masses. We
investigate whether these functions are stable under the RG-flow. Using th
e framework of Epstein-Glaser renormalization\, we find that the answer is
'no'\, if the renormalization mass scale(s) are chosen in a way correspon
ding to the minimal subtraction scheme. This result is derived for the U(1
)-Higgs model to 1-loop order.\n\nhttps://indico.mitp.uni-mainz.de/event/7
6/contributions/2345/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2345/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coffee Break
DTSTART;VALUE=DATE-TIME:20170602T090000Z
DTEND;VALUE=DATE-TIME:20170602T093000Z
DTSTAMP;VALUE=DATE-TIME:20200122T220043Z
UID:indico-contribution-76-2346@indico.mitp.Uni-Mainz.DE
DESCRIPTION:https://indico.mitp.uni-mainz.de/event/76/contributions/2346/
LOCATION:Mainz Institute for Theoretical Physics\, Johannes Gutenberg Univ
ersity 02.430
URL:https://indico.mitp.uni-mainz.de/event/76/contributions/2346/
END:VEVENT
END:VCALENDAR