[Astro] [CAPT] CAPT Weekly Bulletin (w/c 10-11-24)

[Ella Batchelor (staff)]

Monday 10th November at 3pm, A113 CAPT – Theoretical Physics Student Seminar

Usama Aqeel

Matter Sourced Bubble Nucleation in the Asymmetron Scalar-Tensor Theory

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Tuesdays at 11am, CAPT Foyer – Astro Coffee



Tuesday 11th November at 1pm, A113 CAPT – Particle Cosmology and Gravity Seminar

Sotirios Karamitsos (Tartu U.)

Extended metric-affine gravity realization of pole inflation


Pole inflation is a powerful paradigm for building inflationary scenarios. There are many realizations of pole inflation, from elementary particle theory and supersymmetry to modified gravity scenarios. We focus on a very general class of metric-affine F(R) gravity models that incorporate all even-parity quadratic invariants of torsion and non-metricity. The resultant theory is found to be equivalent to a metric theory with a single scalar degree of freedom with a non-canonical kinetic term that features poles. Such poles in the framework of pole inflation are known to dominate the inflationary dynamics such that the predictions of the model are insensitive to the details of the potential as determined here by F(R). We analyse a simplified version of the model analytically as well as the full eleven-parameter theory numerically. We outline conditions that allow for consistent pole inflation: the presence of second-order poles as well as freedom from ghosts, and we additionally check whether specific choices of parameters predict a sufficiently small tensor-to-scalar ratio. We find that by relaxing the ghost-free requirement to only exclude ghosts near the pole, the region of viable models in parameter space is greatly enhanced, leading to a robust class of models for inflation that faithfully reproduces the attractor predictions.

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 12th November at 11am, A113 CAPT – CAPT Coding Club



Wednesday 12th November at 3:45pm, C4 Physics – Astronomy Weekly Seminar

Sownak Bose (Durham)

Small-scale structure in cold dark matter: from ultra-faint dwarfs to prompt cusps


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Thursday 13th November at 1pm, A113 CAPT – Astronomy Lunch Talk
Andrés Ponte Perez (Birmingham)



Thursday 13th November 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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