Emmy Noether Workshop: The Structure of Quantum Space Time

25 talks

November 18, 2019 - November 22, 2019

C19047

Collection Type Conference/School

Subject Cosmology Quantum Fields and Strings Quantum Gravity

Description

Understanding the small-scale structure of spacetime is one of the biggest challenges faced by modern theoretical physics. There are many different attempts to solve this problem and they reflect the diversity of approaches to quantum gravity. This workshop will bring together researchers from a wide range of quantum gravity approaches and give them an opportunity to exchange ideas and gain new insights.

Displaying 1 - 12 of 25

Closing Remarks and Good-Bye

Bianca Dittrich Perimeter Institute for Theoretical Physics
November 22, 2019 PIRSA:19110105
Cosmology

Quantum Fields and Strings

Quantum Gravity
Towards inclusion of biology in cosmology

Marina Cortes University of Lisbon
November 22, 2019 PIRSA:19110104
Cosmology

Quantum Fields and Strings

Quantum Gravity
Central extension and black hole entropy

Linqing Chen Okinawa Institute of Science and Technology (OIST)
November 22, 2019 PIRSA:19110102
Cosmology

Quantum Fields and Strings

Quantum Gravity
Higher spin symmetry in gravity and string

Wei Li Chinese Academy of Sciences - Institute of Theoretical Physics
November 22, 2019 PIRSA:19110101
Cosmology

Quantum Fields and Strings

Quantum Gravity
Evaporating Black Holes in AdS

Netta Engelhardt Massachusetts Institute of Technology (MIT)
November 22, 2019 PIRSA:19110100
Cosmology

Quantum Fields and Strings

Quantum Gravity
How much geometry is in a truncated spectral triple?

Lisa Glaser Universität Wien
November 21, 2019 PIRSA:19110106
Cosmology

Quantum Fields and Strings

Quantum Gravity
Spacetime Foam and the Cosmological Constant

Steve Carlip University of California
November 21, 2019 PIRSA:19110107
Cosmology

Quantum Fields and Strings

Quantum Gravity
AdS/CFT and string sigma-model non-perturbatively

Valentina Forini City, University of London
November 21, 2019 PIRSA:19110109
Cosmology

Quantum Fields and Strings

Quantum Gravity
Semiclassical Einstein equations in cosmological spacetimes

Nicola Pinamonti Università degli studi di Genova - Dipartimento di Matematica
November 21, 2019 PIRSA:19110108
Cosmology

Quantum Fields and Strings

Quantum Gravity
Quantum Sine-Gordon model in perturbative AQFT

Dorothea Bahns Georg-August-Universitat Gottingen - Mathematisches Institut
November 21, 2019 PIRSA:19110099
Cosmology

Quantum Fields and Strings

Quantum Gravity
The Holographic Landscape of Symmetric Product Orbifolds

Alejandra Castro Universiteit van Amsterdam
November 20, 2019 PIRSA:19110098
Cosmology

Quantum Fields and Strings

Quantum Gravity
Tabletop Insights into Quantum Gravity?

Ruth Gregory King's College London - Department of Mathematics
November 20, 2019 PIRSA:19110097
Cosmology

Quantum Fields and Strings

Quantum Gravity

Closing Remarks and Good-Bye

Bianca Dittrich Perimeter Institute for Theoretical Physics
November 22, 2019 PIRSA:19110105
Cosmology

Quantum Fields and Strings

Quantum Gravity
Towards inclusion of biology in cosmology

Marina Cortes University of Lisbon
November 22, 2019 PIRSA:19110104
Cosmology

Quantum Fields and Strings

Quantum Gravity
Cosmologists wish to explain how our universe, in all its complexity, could ever have come about. For that, we assess the number degrees of freedom in our Universe now. This plays the role of entropy in thermodynamics of the Universe, and reveals the magnitude of the problem of initial conditions to be solved. In our budget, we account for gravity, thermal motions, and finally the vacuum energy whose entropy, given by the Bekenstein bound, dominates the entropy budget today. There is however one number which we have not accounted for: the number of degrees of freedom in our complex biosphere. What is the entropy of life? Is it sizeable enough to need to be accounted for at the Big Bang, or negligible compared to vacuum entropy?
Central extension and black hole entropy

Linqing Chen Okinawa Institute of Science and Technology (OIST)
November 22, 2019 PIRSA:19110102
Cosmology

Quantum Fields and Strings

Quantum Gravity
Recent developments on asymptotic symmetries and soft modes have deepened our understanding of black hole entropy and the information paradox. The asymptotic symmetry charge algebra of certain classes of spacetimes could have a nontrivial central extension, which plays a crucial role in black hole physics. The Cardy formula of the asymptotic density of states of the dual CFT has been famously used to reproduce the Bekenstein-Hawking entropy formula. However, without assuming holography, it remains obscure from the point of view of gravity how such a constant on the gravitational phase space encodes the information about the density of black hole microstates, and what the gravitational degrees of freedom accounting for the black hole entropy truly are. I will discuss my ongoing efforts of understanding these questions in the covariant phase space formalism.
Higher spin symmetry in gravity and string

Wei Li Chinese Academy of Sciences - Institute of Theoretical Physics
November 22, 2019 PIRSA:19110101
Cosmology

Quantum Fields and Strings

Quantum Gravity
Higher spin symmetries are gauge symmetries sourced by massless particles with spin greater than two. When coupled with diffeomorphism, they give rise to higher spin gravity. After a review on higher spin gravity, I will discuss its holography and its embedding in the string theory. Finally I will talk about some applications of higher spin symmetry, both in string theory and in QFT.
Evaporating Black Holes in AdS

Netta Engelhardt Massachusetts Institute of Technology (MIT)
November 22, 2019 PIRSA:19110100
Cosmology

Quantum Fields and Strings

Quantum Gravity
How much geometry is in a truncated spectral triple?

Lisa Glaser Universität Wien
November 21, 2019 PIRSA:19110106
Cosmology

Quantum Fields and Strings

Quantum Gravity
A spectral triple consists of an algebra, a Hilbert space and a Dirac operator, and if these three fulfill certain relations to each other they contain the entire information of a compact Riemannian manifold. Using the language of spectral triples makes it possible to generalize the concept of a manifold to include non-commutativity. While it is possible to write down finite spectral triples, often categorized as fuzzy spaces, that describe discretized geometries, classical geometries are encoded in infinite dimensional spectral triples. However working in numerical systems (and maybe ultimately in physical systems), only a finite part of this information can be encoded, which opens the question; If we know a part of the spectrum, how clearly can we characterise a geometry. In this talk I will present first steps towards answering this question.
Spacetime Foam and the Cosmological Constant

Steve Carlip University of California
November 21, 2019 PIRSA:19110107
Cosmology

Quantum Fields and Strings

Quantum Gravity
I describe a radical proposal for the cosmological constant problem: perhaps Lambda really is very large, but is "hidden" in Planck-scale fluctuations of geometry and topology. I show that an enormous set of initial data describe a universe with such a hidden cosmological constant at an initial time. The question of whether this structure is preserved under time evolution is still open, but I provide some evidence that it may be. I close with a discussion of open questions that might lead to further insight (or perhaps kill the idea).
AdS/CFT and string sigma-model non-perturbatively

Valentina Forini City, University of London
November 21, 2019 PIRSA:19110109
Cosmology

Quantum Fields and Strings

Quantum Gravity
I will discuss progress on a non-perturbative approach to the study of string sigma-models relevant in AdS/CFT which exploits lattice field theory techniques.
Semiclassical Einstein equations in cosmological spacetimes

Nicola Pinamonti Università degli studi di Genova - Dipartimento di Matematica
November 21, 2019 PIRSA:19110108
Cosmology

Quantum Fields and Strings

Quantum Gravity
During this talk we shall discuss the backreaction of quantum matter fields on classical backgrounds by means of the semiclassical Einstein equation. We shall see that self consistent solutions of this coupled system exist in the case of cosmological spacetimes. Furthermore, Einstein equations governing the backreaction will transfer quantum matter fluctuations to the metric. In particular, we will see how the singular structure of quantum matter will affect the spectrum of metric perturbations
Quantum Sine-Gordon model in perturbative AQFT

Dorothea Bahns Georg-August-Universitat Gottingen - Mathematisches Institut
November 21, 2019 PIRSA:19110099
Cosmology

Quantum Fields and Strings

Quantum Gravity
We construct the Haag Kaster net of von Neumann algebras for the Sine-Gordon model. This is joint work with Klaus Fredenhagen and Kasia Rejzner.
The Holographic Landscape of Symmetric Product Orbifolds

Alejandra Castro Universiteit van Amsterdam
November 20, 2019 PIRSA:19110098
Cosmology

Quantum Fields and Strings

Quantum Gravity
I will discuss the application of Siegel paramodular forms to constructing new examples of holography. These forms are relevant to investigate the growth of coefficients in the elliptic genus of symmetric product orbifolds at large central charge. The main finding is that the landscape of symmetric product theories decomposes into two regions. In one region, the growth of the low energy states is Hagedorn, which indicates a stringy dual. In the other, the growth is much slower, and compatible with the spectrum of a supergravity theory on AdS_3. I will provide a simple diagnostic which places any symmetric product orbifold in either region. The examples I will present open a path to novel realizations of AdS_3/CFT_2.
Tabletop Insights into Quantum Gravity?

Ruth Gregory King's College London - Department of Mathematics
November 20, 2019 PIRSA:19110097
Cosmology

Quantum Fields and Strings

Quantum Gravity
I'll describe my recent work on black hole seeded vacuum decay, and proposals for testing seeded decay in cold atom experiments. I'll conclude with speculations on seeking insight into quantum black holes via experimentally constructing quantised analog black holes.

Title	Speaker(s)	Date	Talk Type	Info
Closing Remarks and Good-Bye	Bianca Dittrich	2019-11-22	Conference	View details
Towards inclusion of biology in cosmology	Marina Cortes	2019-11-22	Conference	View details
Central extension and black hole entropy	Linqing Chen	2019-11-22	Conference	View details
Higher spin symmetry in gravity and string	Wei Li	2019-11-22	Conference	View details
Evaporating Black Holes in AdS	Netta Engelhardt	2019-11-22	Conference	View details
How much geometry is in a truncated spectral triple?	Lisa Glaser	2019-11-21	Conference	View details
Spacetime Foam and the Cosmological Constant	Steve Carlip	2019-11-21	Conference	View details
AdS/CFT and string sigma-model non-perturbatively	Valentina Forini	2019-11-21	Conference	View details
Semiclassical Einstein equations in cosmological spacetimes	Nicola Pinamonti	2019-11-21	Conference	View details
Quantum Sine-Gordon model in perturbative AQFT	Dorothea Bahns	2019-11-21	Conference	View details
The Holographic Landscape of Symmetric Product Orbifolds	Alejandra Castro	2019-11-20	Conference	View details
Tabletop Insights into Quantum Gravity?	Ruth Gregory	2019-11-20	Conference	View details

Emmy Noether Workshop: The Structure of Quantum Space Time

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