[Astro] [CAPT] Particle Cosmology and Gravity Seminar this week: Ayngaran Thavanesan (DAMTP, Cambridge)

[Swagat Mishra]

Dear All,
             We have Ayngaran Thavanesan visiting from Cambridge University this week (from Monday to Thursday) to deliver the seminar and to interact with David Stefanyszyn. He will be based in office B112. The details are as follows (Note that it is an extended seminar 1+1 hour long) -

  1.
Speaker: Ayngaran Thavanesan (DAMTP, Cambridge University)

            Seminar date: 22 October, Tuesday 1 pm

        Regular seminar talk: 1pm - 2pm,
      Extended talk: 2pm - 3 pm (For people who are free, and are interested in hearing the extended part)

           Venue: Seminar Room A 113  (Cripps North Building)

            Title: To dS/CFT and Back Through Cauchy Slice Holography

Abstract:  In this talk, I will first introduce Cauchy Slice Holography (CSH), which uses the TTbar deformation to connect CFT states in a holographic theory to bulk Wheeler-DeWitt states, providing us with a bulk holographic dictionary. Unlike AdS/CFT, de Sitter (dS) space lacks a fully established holographic dictionary, but boundary observables remain constrained by conformal invariance. Using the CSH dictionary, I will show how to flow 2-point correlators from the boundary to a finite-time Poincaré slice of dS, enabling the computation of finite-time cosmological correlators. I’ll highlight key differences from the AdS case.

In the second part, I will explore the TTbar+Λd deformation to obtain a CFT dual of global dS by continuing this deformation of a Euclidean CFT with a sparse spectrum to Cauchy slices. Extending the flow past the static patch horizon leads to an imaginary spectrum, allowing an interpretation of the Gibbons-Hawking entropy microstates as living on Euclidean Cauchy slices. The CFT limit is restored as the deformation parameter approaches zero.

Time permitting I will discuss recent explorations for UV-completions of CSH which will thus define non-perturbative bulk quantum gravity.


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A list of upcoming seminars for this term (with rough titles)
·    29 Oct | Santiago Agui Salcedo (DAMTP Cambridge) | Open EFT for inflation
·    05 Nov | Yuyu Mo (Edinburgh Higgs Centre) | Bootstrap
·   12 Nov | Alex Jenkins (UCL) | Quantum Matter, Analogue Gravity
·   19 Nov |  Bjoern Friedrich (Heidelberg) | String Phenomenology
·    26 Nov | Tamara Evstafyeva (DAMTP Cambridge) | Gravitational Waves
·    03 Dec | Emma Albertini (Imperial College London) | Gravity, Scattering Amplitudes
·    10 Dec | TBD


With Regards,
-Swagat




Swagat Saurav Mishra,

Postdoctoral Research Associate

​

Particle Cosmology Group,

Centre for Astronomy and Particle Theory,

University of Nottingham, Nottingham NG7 2RD, UK.

Website: https://swagatam18.wordpress.com/

Research Link:https://inspirehep.net/authors/1517353

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