[Astro] [CAPT] CAPT Weekly Bulletin (w/c 27-04-26)

[Ella Batchelor (staff)]

Monday 27th April at 3pm, A113 CAPT – Theoretical Physics Student Seminar

Mohammed Shafi Hashim Nazeer

How similar are Q-balls and instantons?

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Tuesdays at 11am, CAPT Foyer – Astro Coffee

Tuesdays at 11.30am, A113 CAPT – Astronomy Journal Club



Tuesday 28th April at 1pm, C12 Physics – Particle Cosmology and Gravity Seminar

Adam Smith (Sheffield) - Please note the change of speaker. Dr Mulryne was unable to make it this week

Axion-dilaton interactions in the dark sector


Axion-dilaton models constitute a well-motivated and minimal class of theories that emerge in extra-dimensional completions of high-energy physics. These models naturally feature kinetic couplings between multiple scalar fields, which can have significant consequences in late-time cosmology. I will present the cosmological implications of these interactions when prescribing an axion and a dilaton field to describe dark matter and dark energy, respectively, including the predicted effects on the CMB, late time structure growth, and particle mass evolution. I will show that these effects allow a resolution of the Hubble tension and the model to fake a phantom cross, fitting the recent DESI data as well as the phenomenological parameterisations, in a single minimal framework.



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 29th April at 3pm, B13 Physics – School Colloquium

Bruno Bertini (Birmingham)

Exact many-body dynamics in quantum circuits via space-time duality



In recent years, quantum circuits have emerged as useful effective models to understand generic quantum many-body dynamics, and as concrete platforms for quantum simulation. The most appealing feature of these systems is that, contrary to generic many-body systems in continuous time, the dynamics of quantum circuits are sometimes amenable to analytical treatment. In the talk I will present a fruitful route to achieve this goal based on imposing a duality symmetry between space and time. I will review how this symmetry allows to fully characterise interesting features of quantum many-body dynamics, such as entanglement spreading and operator growth, and examine its implications. I will then discuss ideas to systematically weaken this symmetry while retaining (some) solvability.



Refreshments served in C10 after the Colloquium

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Thursday 30th April at 1pm, A113 CAPT – Astronomy Lunch Talk

Callum O’Kane
Environmental Dependence of Galaxy Evolutionary Histories

Understanding how environment shapes galaxy evolution remains a fundamental challenge, yet most studies focus solely on present-day properties. Here, we move beyond this limitation by reconstructing star formation and chemical enrichment histories using physically motivated galaxy evolution models that incorporate gas inflows and outflows, with parameters constrained through full spectral fitting.

We analyse a sample of ~10,000 massive (M⋆ > 10^10.45 M☉) galaxies with high signal-to-noise spectra from the Sloan Digital Sky Survey, recovering a diverse range of evolutionary histories across environments spanning the field, filaments, groups, and clusters. We identify several distinct evolutionary pathways and quantify their relative abundance as a function of environment.

We then assess whether differences between environments persist after controlling for stellar mass and local density, highlighting the dominant role of the small-scale environment, as traced by local density.



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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