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VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Asymptotically safe Einstein Palatini gravity
DTSTART;VALUE=DATE-TIME:20210928T074500Z
DTEND;VALUE=DATE-TIME:20210928T081500Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-420@indico.tpi.uni-jena.de
DESCRIPTION:Speakers: Abdol Sabor Salek (TPI Jena)\nThe Einstein-Palatini
formulation of gravity treats the metric and the connection as independent
degrees of freedom. The most general extension on the level of the Einste
in-Hilbert action equips the connection with a U(1)-symmetric vector field
as an addition to the conventional Levi-Cevita connection. Making a scale
-dependant analysis within the Asymptotic Safety scenario of quantum gravi
ty by employing the Functional Renormalization Group equation\, we find a
Reuter-like UV-attractive fixed point that is supportive of the weak gravi
ty bound.\n\nhttps://indico.tpi.uni-jena.de/event/214/contributions/420/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/420/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum energy inequalities and integrable quantum field theories
DTSTART;VALUE=DATE-TIME:20210927T121500Z
DTEND;VALUE=DATE-TIME:20210927T124500Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-416@indico.tpi.uni-jena.de
DESCRIPTION:Speakers: Jan Mandrysch (ITP Leipzig)\nMany results in general
relativity rely crucially on classical energy conditions inflicted on the
stress-energy tensor. Quantum matter\, however\, violates these condition
s since its energy density can become arbitrarily negative at a point. Non
etheless quantum matter should have some reminiscent notion of stability\,
which can be captured by the so-called quantum (weak) energy inequalities
(QEIs)\, lower bounds of the smeared quantum-stress-energy tensor. QEIs c
ould be proven in many free quantum field theory (QFT) models on both flat
and curved spacetimes. In interacting theories only few results exist. We
are here presenting numerical and analytical results on QEIs in interacti
ng integrable QFT models in 1+1 dimension\, in particular the O(N)-nonline
ar-sigma and sinh-Gordon model at 1- and 2-particle level.\n\nhttps://indi
co.tpi.uni-jena.de/event/214/contributions/416/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/416/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prompt Collapse in Binary Neutron Star Mergers: The Effect of the
Mass Ratio
DTSTART;VALUE=DATE-TIME:20210928T143000Z
DTEND;VALUE=DATE-TIME:20210928T150000Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-449@indico.tpi.uni-jena.de
DESCRIPTION:Speakers: Maximilian Kölsch (TPI Jena)\nThe outcome of a bina
ry neutron star merger dominantly depends on the total mass of the system
and the equation of state describing the matter. However\, the mass ratio
also influences the postmerger evolution\, in particular\, whether there i
s a prompt or delayed collapse. Furthermore\, the mass ratio influences wh
ich fraction of the initial baryonic mass ends up in a disc around a so fo
rmed black hole\, and the mass of the latter. We investigate the prompt co
llapse threshold with a new set of general relativistic simulations coveri
ng seven mass ratios\, and three equations of state. We propose a fitting
formula for the dependence of the threshold mass on the mass ratio.\n\nhtt
ps://indico.tpi.uni-jena.de/event/214/contributions/449/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/449/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Student & PI Meeting
DTSTART;VALUE=DATE-TIME:20210929T114500Z
DTEND;VALUE=DATE-TIME:20210929T124500Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-448@indico.tpi.uni-jena.de
DESCRIPTION:https://indico.tpi.uni-jena.de/event/214/contributions/448/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/448/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Core collapse in scalar-tensor theory with massive fields
DTSTART;VALUE=DATE-TIME:20210929T091500Z
DTEND;VALUE=DATE-TIME:20210929T100000Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-429@indico.tpi.uni-jena.de
DESCRIPTION:Speakers: Roxana Rosca-Mead (TPI\, University of Jena)\nThough
General Relativity has been successfully tested so far\, concepts such as
dark energy and string theory suggest the need of modifying it. Scalar-te
nsor theory is one of the most popular alternatives discussed. The key mot
ivation for looking at the ones with massive fields is that they are far l
ess constrained by binary pulsar observations\, in contrast to the massles
s case. In this talk\, I will demonstrate studies in stellar core collapse
in spherical symmetry that were performed by adapting the numerical code
GR1D to the case of massive scalar-tensor gravity. The addition of a mass
term allows\, within present constraints\, much stronger gravitational wav
e emission than in the massless case\, while the dispersion in the propaga
tion of the scalar leads to a quasi-monochromatic signal\, potentially det
ectable by LIGO /Virgo with existing analysis pipelines.\n\nhttps://indico
.tpi.uni-jena.de/event/214/contributions/429/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/429/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constraints on nuclear equations of state from binary neutron star
mergers
DTSTART;VALUE=DATE-TIME:20210928T140000Z
DTEND;VALUE=DATE-TIME:20210928T143000Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-426@indico.tpi.uni-jena.de
DESCRIPTION:Speakers: Matteo Breschi (FSU Jena)\nMulti-messenger observati
ons of binary neutron star mergers can provide essential information on t
he properties of the nuclear equation of state of these compact objects.
We perform Bayesian inference on GW170817 and its kilonova counterpart AT
2017gfo\, constraining the radius of a neutron star of 1.4 M⊙ to 12.2
±0.5 km (1σ level). Furthermore\, we show how post-merger gravitational
-waves can inform us on the high-density regimes: such observation would c
onstrain the maximum central density of a non-rotating neutron star with
an error of the order of ~15% at the 90\\% confidence level.\n\nhttps://
indico.tpi.uni-jena.de/event/214/contributions/426/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/426/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational Waves from Black hole - Neutron Stars
DTSTART;VALUE=DATE-TIME:20210928T133000Z
DTEND;VALUE=DATE-TIME:20210928T140000Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-424@indico.tpi.uni-jena.de
DESCRIPTION:Speakers: Alejandra Gonzalez ()\nSince the first observation o
f a GW from a binary black hole in 2015\, many more have been observed in
recent years. GW astronomy provides us with a powerful tool to do science
through the information we can get from their detection in interferometers
. Most recently\, GWs from black hole - neutron star mergers have been obs
erved for the first time. These coalescences are promising candidates to b
e the source of Kilonova and GRBs. Their detection could also provide us w
ith information about the neutron star's structure. To achieve this\, one
needs waveform models to succesfully detect these peculiar binary systems.
\n\nhttps://indico.tpi.uni-jena.de/event/214/contributions/424/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/424/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A rigorous derivation of the functional renormalisation group equa
tion
DTSTART;VALUE=DATE-TIME:20210928T071500Z
DTEND;VALUE=DATE-TIME:20210928T074500Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-419@indico.tpi.uni-jena.de
DESCRIPTION:Speakers: Jobst Ziebell (TPI Jena)\nThe functional renormalisa
tion group equation is derived in a mathematically rigorous fashion in a f
ramework suitable for the Osterwalder-Schrader formulation of quantum fiel
d theory. To this end\, we devise a very general regularisation scheme and
give precise conditions for the involved regulators guaranteeing physical
boundary conditions. Furthermore\, it is shown how the classical limit is
altered by the regularisation process leading to an inevitable breaking o
f translation invariance. We also give precise conditions for the converge
nce of the obtained theories upon removal of the regularisation.\n\nhttps:
//indico.tpi.uni-jena.de/event/214/contributions/419/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/419/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charged quantum fields inside black holes
DTSTART;VALUE=DATE-TIME:20210927T114500Z
DTEND;VALUE=DATE-TIME:20210927T121500Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-415@indico.tpi.uni-jena.de
DESCRIPTION:Speakers: Christiane Klein (ITP Leipzig)\nThe strong cosmic ce
nsorship conjecture states that black hole spacetimes cannot be continued
beyond their inner horizon due to the divergence of local observables\, su
ch as the stress-energy tensor of a classical or quantum scalar field\, at
that horizon. In the case of a spherically symmetric\, charged black hole
\, numerical and analytical studies indicate\, that this conjecture is vio
lated classically\, even for charged scalar fields\, but that the conjectu
re can be restored by quantum effects in the real scalar case. Here\, we p
resent a study on the behaviour of quantum charged scalar fields in a char
ged\, non-rotating black hole. Apart from an extension of the results for
real quantum fields\, we focus on the charge current induced by this field
. We derive an expression for the renormalized current in the Unruh vacuum
. In addition\, we demonstrate numerically\, that the quantum scalar field
can charge\, instead of discharge\, the black hole near the inner horizon
.\n\nhttps://indico.tpi.uni-jena.de/event/214/contributions/415/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/415/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An introduction to tensor networks for describing strongly correla
ted quantum many-body systems I
DTSTART;VALUE=DATE-TIME:20210927T090000Z
DTEND;VALUE=DATE-TIME:20210927T100000Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-414@indico.tpi.uni-jena.de
DESCRIPTION:Speakers: Frank Verstraete (Ghent University)\nhttps://indico.
tpi.uni-jena.de/event/214/contributions/414/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/414/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inti Sodemann
DTSTART;VALUE=DATE-TIME:20210928T114500Z
DTEND;VALUE=DATE-TIME:20210928T124500Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-423@indico.tpi.uni-jena.de
DESCRIPTION:https://indico.tpi.uni-jena.de/event/214/contributions/423/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/423/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topology vs. interaction: the strong\, the weak and the fragile
DTSTART;VALUE=DATE-TIME:20210929T133000Z
DTEND;VALUE=DATE-TIME:20210929T143000Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-431@indico.tpi.uni-jena.de
DESCRIPTION:Speakers: Ady Stern (Weizmann Institute)\nTopological systems
of non-interacting electrons may be forced by their topological nature to
have a gapless spectrum. As two examples\, Integer quantum Hall states and
topological insulators must carry gapless edge states\, which allow them
to carry current. Whether interaction between the electrons may turn a gap
less conductor into a fully gapped insulator depends on the case at hand\,
with a negative answer for the first example and a positive for the secon
d.\n\nIn this talk I will review these two examples\, and then discuss ban
ds of fragile topology. I will explain what fragile topology is as well as
how and when it forbids a gapped spectrum at the non-interacting level. T
hen\, I will show that in this case interactions may be powerful enough to
overcome the decree issued by topology\, and explain how they do that. Fi
nally\, I will discuss relevance to twisted bi-layers of graphene.\n\nhttp
s://indico.tpi.uni-jena.de/event/214/contributions/431/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/431/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dualities in one and two-dimensional quantum systems
DTSTART;VALUE=DATE-TIME:20210929T070000Z
DTEND;VALUE=DATE-TIME:20210929T083000Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-428@indico.tpi.uni-jena.de
DESCRIPTION:Speakers: David Mross (Weizmann Institute)\nhttps://indico.tpi
.uni-jena.de/event/214/contributions/428/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/428/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An introduction to tensor networks for describing strongly correla
ted quantum many-body systems III
DTSTART;VALUE=DATE-TIME:20210928T090000Z
DTEND;VALUE=DATE-TIME:20210928T100000Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-422@indico.tpi.uni-jena.de
DESCRIPTION:Speakers: Frank Verstraete (Ghent University)\nhttps://indico.
tpi.uni-jena.de/event/214/contributions/422/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/422/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An introduction to tensor networks for describing strongly correla
ted quantum many-body systems II
DTSTART;VALUE=DATE-TIME:20210927T133000Z
DTEND;VALUE=DATE-TIME:20210927T143000Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-417@indico.tpi.uni-jena.de
DESCRIPTION:Speakers: Frank Verstraete (Ghent University)\nhttps://indico.
tpi.uni-jena.de/event/214/contributions/417/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/417/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Welcome address
DTSTART;VALUE=DATE-TIME:20210927T085500Z
DTEND;VALUE=DATE-TIME:20210927T090000Z
DTSTAMP;VALUE=DATE-TIME:20240527T194451Z
UID:indico-contribution-214-412@indico.tpi.uni-jena.de
DESCRIPTION:https://indico.tpi.uni-jena.de/event/214/contributions/412/
LOCATION:
URL:https://indico.tpi.uni-jena.de/event/214/contributions/412/
END:VEVENT
END:VCALENDAR