[Astro] [CAPT] CAPT Weekly Bulletin (w/c 15-07-24)

[Ella Batchelor]

Tuesdays at 11am, CAPT Foyer – Astro Coffee



Tuesdays at 1pm, A113 CAPT – Astronomy Journal Club

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Wednesday 17th July at 11am, C27 Physics

Enrico Cannizzaro (Lisbo, Instituto Superior Tecnico)

Black holes as laboratories for fundamental physics: Superradiant instabilities



It is well known that spinning black holes (BHs) are unstable under ultralight massive bosonic perturbations. Due to this so-called superradiant instability, a macroscopic bosonic condensate can form around the BH, leading to striking observable signatures, such as the emission of detectable gravitational waves from the condensate itself. Hence, this phenomenon represents a powerful tool to probe ultralight fields beyond the Standard Model, such as axions or dark photons. Until recently, studies of the instability assumed the superradiant field to be free from interactions, aside from a minimal coupling to gravity. However, as number densities can reach extreme values in the process, the effect of interactions can be crucial, even for very feebly interacting fields. In particular, interactions with the ambient plasma environment (namely an accretion disk or interstellar plasma) or couplings to other Standard Model fields can dramatically change the evolution of these systems. In this talk, I will describe the role of interactions and environmental effects in different superradiant systems, showing their impact in the evolution of the instabilities.
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Thursday 18th July at 1pm, A113 CAPT – Astronomy Lunch Talk

Arghyadeep Basu (Max Planck Institute for Astrophysics, Garching)
Impacts of Non-stellar Sources on IGM : Interpretation of Lyman-ɑ forest observations

The Epoch of Reionization (EoR) marks a critical phase in the evolution of the universe, yet remains poorly understood. While star-forming galaxies are acknowledged as key contributors to ionized bubble formation, the extent of contribution from alternative sources such as shock-heated ISM or emission from X-ray binaries remains unclear. In this study, we employ cosmological radiative transfer simulations to explore the impact of diverse sources on intergalactic medium (IGM) properties. Our focus is not merely data fitting, but rather understanding whether the interpretation of Lyman-ɑ forest observations is changed by using theoretical models incorporating non-stellar sources. By decoupling various sources, we also aim to discern their individual contributions to the reionization process. In this presentation, I’ll discuss our simulation methodology and initial insights into our findings.

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Fridays at 4pm, CAPT Foyer – CAPT Cakes
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VISITORS
Arghyadeep Basu (PhD student at the Max Planck Institute for Astrophysics, Garching) is visiting the group this week. Arghyadeep is currently seated in office A108.  He will be giving a lunch talk this Thursday on his recent work on modelling helium reionisation.

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If you have any events/visitors you would like including 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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