[Astro] [CAPT] CAPT Weekly Bulletin (w/c 21-10-24)

[Ella Batchelor]

Tuesdays at 11am, CAPT Foyer – Astro Coffee



Tuesday 22nd October, A113 CAPT at 11am – Astronomy Journal Club



Tuesday 22nd October, A113 CAPT at 1pm – Particle Cosmology Seminar (Regular seminar talk: 1pm - 2pm; Extended talk: 2pm - 3 pm (For people who are free, and are interested in hearing the extended part)
Ayngaran Thavanesan (DAMTP, Cambridge University)
To dS/CFT and Back Through Cauchy Slice Holography

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.

Link to join: https://teams.microsoft.com/l/meetup-join/19%3ameeting_OGM3OTk5NzQtZWEwZS00ZmUyLTk3MGUtZjFhY2M5OTU2MjI1%40thread.v2/0?context=%7b%22Tid%22%3a%2267bda7ee-fd80-41ef-ac91-358418290a1e%22%2c%22Oid%22%3a%22f3250584-4b5f-48fa-a897-08e77f2246b7%22%7d

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Wednesday 23rd October, C5 Physics at 3.45pm – Astronomy Seminar
Haida Lang (NTU)

From Astronomy to Archaeology: multimodal imaging and remote sensing for the study of the history of the Silk Road and much more…



Astronomy studies the history of the universe while archaeology studies the history of the human past. The talk will explore the benefits of interdisciplinary research from fundamental science (e.g. Astrophysics) to applied science and Engineering and how applications to cultural heritage materials can inspire the development of instruments that are useful for industrial monitoring. Inspired by ideas from Astronomy, various remote sensing and interferometric imaging techniques have been developed for cultural heritage material analysis to study history and help art conservation. As the volume of data collected is becoming too large to manage using traditional image analysis methods, machine learning methods are developed to analyse data from automated high resolution large scale surveys of wall paintings such as those in cave temples along the Silk Road. This talk will discuss some of the unexpected contribution of astronomy to the field of heritage science including conservation science and archaeological science.

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Thursday 24th October at 1pm, A113 CAPT – Astronomy Lunch Talk
Jesse Golden-Marx



Thursday 24th October, A113 CAPT at 3pm – Particle Cosmology Journal Club
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Fridays at 2pm, A113 CAPT – CAPT Coding Club

Fridays at 4pm, CAPT Foyer – CAPT Cakes
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If you have any events/visitors you would like included in next week’s bulletin, please let me know


Best wishes

Ella

Ella Batchelor (she/her)
Administrator

School of Physics & Astronomy

University of Nottingham
A112a Centre for Astronomy & Particle Theory
University Park
Nottingham, NG7 2RD

+44 (0) 115 74 86778 |  nottingham.ac.uk<http://nottingham.ac.uk/>

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