[Astro] [CAPT] CAPT Weekly Bulletin (w/c 20-04-26)

[Ella Batchelor (staff)]

Monday 20th April at 3pm, A113 CAPT – Theoretical Physics Student Seminar

Kieran Wood

Dark matter production in the early universe

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Tuesdays at 11am, CAPT Foyer – Astro Coffee

Tuesdays at 11.30am, A113 CAPT – Astronomy Journal Club



Tuesday 21st April at 1pm, C12 Physics – Particle Cosmology and Gravity Seminar

Anish Ghoshal (Warsaw)

Hearing the Universe Humm with Pulsar timing array: Gravitational Waves and Primordial Black Holes from First-order Phase Transition



We will discuss interpretation of the nHz stochastic gravitational wave background (SGWB) seen by NANOGrav and other Pulsar Timing Array (PTA) Collaborations in the context of supermassive black hole (SMBH) binaries. The frequency spectrum of this stochastic background is predicted more precisely than its amplitude. We will discuss how Dark Matter friction can suppress the spectrum around nHz frequencies, where it is measured, allowing robust and significant bounds on the Dark Matter density, which, in turn, controls indirect detection signals from galactic centers. Next we will discuss alternative cosmological interpretations including cosmic strings, phase transitions, domain walls, primordial fluctuations and axion-like physics. We will discuss how well these different hypotheses fit the NANOGrav data, both in isolation and in combination with SMBH binaries, and address the questions: which interpretations fit the data best, and which are disfavoured. We also discuss experimental signatures that can help discriminate between different sources of the PTA GW signals with complementary probes using CMB experiments and searches for light particles in DUNE, IceCUBE-Gen2, neutrinoless double beta decay, and forward physics facilities at the LHC like FASER nu, etc. and with Primordial Black Hole formation and its constraints in the context to theories of dynamical electroweak symmetry breaking predict a strong first order cosmological phase transition.



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 23rd April at 1pm, A113 CAPT – Astronomy Lunch Talk

Jake Bennett

Feedback and the circumgalactic medium


Understanding how galaxies regulate their growth requires modelling the complex interplay between feedback and the circumgalactic medium (CGM), which can act as both a reservoir and a barrier for gas accretion onto galaxies. I will present a series of cosmological simulations exploring how feedback from stars and AGN shapes the structure and evolution of the CGM across a range of environments.

Starting in the early Universe, I will discuss the high-redshift progenitors of galaxy clusters, where I explore the impact of feedback and mergers on the nascent intracluster medium. I will then turn to recent work developing new feedback models that better capture the impact of high-energy outflows on halo gas, and how these influence galaxy growth in cosmological simulations. Together, these results highlight the central role of feedback in governing the baryon cycle from galactic to cluster scales.



Thursdays 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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