[Astro] [CAPT] CAPT Weekly Bulletin (w/c 23-06-25)

[Ella Batchelor]

Monday 23rd June at 3pm, A113 CAPT – Theoretical Physics Student Seminar

Peter Du

Inevitability in physics
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Tuesdays at 11am, CAPT Foyer – Astro Coffee



Tuesday 24th June at 11.30am, A113 CAPT – Astronomy Journal Club



Tuesday 24th June at 1pm, A113 CAPT – Particle Cosmology and Gravity Seminar
Dong-Gang Wang (Hong Kong UST)

New Twists on Cosmological Bootstrap: Theory & Observations



In recent years, our theoretical understanding on the statistics of primordial fluctuations has improved significantly. In particular the cosmological bootstrap program provides a new perspective toward the investigation of cosmological correlators at the end of inflation. In this talk, I will first briefly review the progresses on bootstrapping phenomenologically relevant correlators, which include the primordial bispectra from single field, multi-field and cosmological colliders. After that, I will introduce new twists on both the theoretical development and also the observational tests. On the theory side, we extend the bootstrap analysis to reexamine more realistic inflation models in UV-complete setups. Interestingly, for a particular example of string inflation, we identify an unnoticed UV-sensitive signature in cosmological correlators. For observational test, guided by the bootstrap computation, we initiate a comprehensive search for the most significant signal of cosmological collider physics in the latest CMB data.


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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Thursday 26th June at 1pm, A113 CAPT – Astronomy Lunch Talk

Diego Pallero (Universidad Técnica Federico Santa María, Chile)

The formation pathways of S0-galaxies: Upcoming science with SPLUS and CHANCES-4MOST

One of the fundamental problems in modern astrophysics is understanding the environment's role in the galaxy's evolution. Many works, both theoretical and observational, have focused on this topic. Nevertheless, it is not clear yet which are the main physical mechanisms behind the quenching of star formation. We used state-of-the-art C-EAGLE hydrodynamical simulations to characterize the moment when galaxies quench their star formation and suffer morphological transformations. We find that > 70% of galaxies suffer strong drops in their SFR before they are accreted onto the clusters, regardless of the cluster mass. However, most galaxies get completely quenched once they fall into galaxy clusters, several Gyr after this processing event. The culprit behind this quenching is primarily ram-pressure stripping, produced at the outskirts of the first cluster in which galaxies reside. Additionally, when looking specifically at the population of S0 galaxies, we found that lenticular galaxies can be split into two distinctive populations: first, a dominant population of satellite galaxies inhabiting massive haloes with no mergers at z<2, and second, a population of central lenticular galaxies inhabiting less massive haloes with a mixed merging history. This work suggests that S0s, and quenched galaxies in general, are formed primarily via ram-pressure stripping. These results will be tested with current and upcoming multiwavelength observations from surveys such as S-PLUS, CHANCES/4MOST, LOFAR and Euclid, and give us key hints on what to look for when trying to understand the origin of lenticular galaxies.


Thursday 26th June at 3pm, A113 CAPT – Particle Cosmology Journal Club
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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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