[Astro] [CAPT] CAPT Weekly Bulletin (w/c 23-09-24)

[Ella Batchelor]

Welcome to all our new PGR students!



Tuesdays at 11am, CAPT Foyer – Astro Coffee



Tuesday 24th September, A113 CAPT at 1pm – Particle Cosmology Seminar


Jeremy Wachter (Wentworth Institute of Technology, Boston) – Online Seminar
Numerical studies of gravitational self-evolution of cosmic string loops

We present the results of large-scale numerical calculation of how realistic cosmic string loops evolve due to gravitational self-interaction. Initially kinky loops are smoothed, leading to a reduction in the gravitational wave power. However, smoothing never produces strong cusps. Gravitational self-interaction also causes the gravitational wave background from loops to be reduced, more strongly at higher frequencies. We comment on future detectability and other observable impacts, such as loop clustering in galaxies.

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 September, A113 CAPT at 1pm – Astronomy Lunch Talk
Tutku Kolcu
Cosmic Carousel of Gas Inflows to the Galactic Nuclei

Gas inflows contribute to the evolution of galaxies in a plethora of ways, e.g., by forming stellar substructures in the nuclear regions, feeding AGN and quenching star formation. In barred galaxies, they occur in straight extended shocks along the bar, though these shocks weaken in the central kpc, leaving the dominant driving mechanism for gas inflows in galactic centres not yet fully understood. Shocks persisting over large regions in the inner kpc could cause gas inflow and should be observable as coherent velocity jumps in kinematic maps. With the aid of integral-field unit observations from MUSE on the VLT — which has a large FoV that maximizes the prospect of finding these coherent structures —I study ionized gas kinematic maps of the centres of barred galaxies from the Composite Bulges Survey (Erwin et al. 2021) and the TIMER Survey (Gadotti et al. 2019) of nearby galaxies. Using the methodology developed in Kolcu et al. 2023 that involves residual velocity and velocity difference maps, we identify coherent kinematic structures, with the aim to determine the dominant mechanism of inflow in the nuclear regions of galaxies and understand weather this mechanism is analogous to large-scale bar driven inflows. In this presentation, I will briefly introduce the methodology I use, and present our findings for our galaxy sample.



Thursday 26th September, A113 CAPT at 3pm – Particle Cosmology Seminar
Christian Kading (TU Wien, Vienna)
New paths in the search for light scalar fields

The existence of additional light scalar fields in nature is predicted by many theories in modern physics. In particular, light scalar fields are suggested to play a variety of roles in cosmology and astrophysics. For example, they are frequently considered as candidates for dark matter or dark energy. Consequently, there are continuing experimental and theoretical efforts in searching for light scalar fields. In this talk, we will look at chameleons, symmetrons, and environment-dependent dilatons as prominent examples of so-called screened scalar fields. We will theoretically discuss the use of (open) quantum dynamics and finite-temperature effects as new ways of probing such models. In particular, we will show that some of these previously untaken paths have the potential to put tighter constraints on the parameter spaces of light scalar fields.

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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Fridays at 4pm, CAPT Foyer – CAPT Cakes
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VISITORS
Esin Gülbahar, who is a Young Graduate Trainee at ESAC (Madrid) will be visiting Joe Butler on Thursday and Friday this week.
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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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