[Astro] [CAPT] CAPT Weekly Bulletin (w/c 13-10-25)

[Ella Batchelor (staff)]

Monday 13th October at 3pm, A113 CAPT – Theoretical Physics Student Seminar

Chanon Hasuwannakit

Spinor-helicity and MHV amplitude calculation for Yang-Mills & GR



Tuesdays at 11am, CAPT Foyer – Astro Coffee



Tuesday 14th October at 1pm, A113 CAPT – Particle Cosmology and Gravity Seminar

William Coulton (Cambridge)

Connecting primordial physics to cosmological observables through simulations


Cosmology is entering a golden era with the coming decade bringing a wealth of multiwavelength observations of the cosmos. Unfortunately, relating these precision observations to the sought after primordial processes is complex due to the non-linear processes that have governed the evolution of the universe. In this talk I will describe the role that cosmological simulations can play in untangling primordial signals from late-time astrophysical processes. These approaches will shed new light on aspects from the number of fields present during inflation to the strength of interactions to symmetries of inflation. I will conclude by describing ongoing efforts to combine these approaches with new measurements, such as those by the Atacama Cosmology Telescope and Simons Observatory.

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 15th October at 11am, A113 CAPT – CAPT Coding Club



Wednesday 15th October at 3.45pm, C14 Physics – Astronomy Weekly Seminar

James Nightingale (Newcastle)

Supermassive Black Holes, Galaxies and Dark Matter with Strong Gravitational Lensing


In a strong gravitational lens, a background source galaxy appears multiple times, because its light is deflected by an intervening foreground galaxy’s mass. Lens modeling reverses the source galaxy’s deflected emission and reconstructs the foreground lens’s projected gravitational potential at an unprecedented level of detail, providing Astronomer’s with a powerful tool to study the Universe. I present the first measurement of a supermassive black hole (SMBH) mass using strong lensing, detecting a $\log_{10}(M_{\text{BH}}/M_{\odot}) = 3.27 \pm 2.12 \times 10^{10}$ SMBH in the $z = 0.451$ lens Abell 1201. I discuss the potential for lensing to measure additional SMBH masses and its implications for black hole demographics. I then explore how strong lensing enhances traditional studies of galaxy structure, revealing complex features such as boxiness, diskiness, asymmetric twists, lopsidedness, and stellar-to-dark matter offsets—features that challenge our current understanding of galaxy formation. Finally, I demonstrate how unseen dark matter substructures perturb lensed emission, providing a unique opportunity to test different dark matter models, provided that we can overcome limitations in our knowledge of galaxy mass distributions.

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Thursday 16th October at 1pm, A113 CAPT – Astronomy Lunch Talk

Julian Onions
What will I be when I grow up?


Do high redshift clusters grow in a predictable way? Can we estimate how big something will be that is big at early times? In this talk I'll show why this is not necessarily the case, and that we have to be a little more cautious about predicting cluster size from their beginnings. After a few years - this project finally came to a conclusion, so I will recap what we found.



Thursday 16th October 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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