[Astro] [CAPT] CAPT Weekly bulletin (w/c 02-02-26)

[Ella Batchelor (staff)]

Monday 2nd February at 3pm, A113 CAPT – Theoretical Physics Student Seminar

Farbod Rassouli

Time as a volume

---

Tuesdays at 11am, CAPT Foyer – Astro Coffee

Tuesdays at 11.30am, A113 CAPT – Astronomy Journal Club



Tuesday 3rd February at 1pm, A113 CAPT – Particle Cosmology and Gravity Seminar

Qi-Xin Xie

Quantum fields in boson star spacetime



Boson stars have been extensively studied in classical gravity, but their quantum properties remain comparatively unexplored. We compute the quantum scalar fields and stress tensor in boson star spacetimes within the framework of semiclassical gravity. Divergences are regularized using Pauli-Villars fields, and accurate numerical results are obtained through spectral methods. Employing coherent states enables a direct comparison between the classical part of the stress tensor and the quantum fluctuation. Our results indicate that strong spacetime curvature is the primary source of large quantum effects. The renormalized quantum energy density is mostly positive but the radial pressure is negative, suggesting that classical boson star solutions require modification once quantum effects are included. Moreover, in regimes of large curvature, the quantum fluctuations can constitute a significant fraction of the total stress tensor. The methods developed here can be generalized to other compact objects and used to study their response to quantum corrections.



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
---

Wednesday 4th February, 2-3.30pm, B1 Physics – Physics Research Jamboree (all welcome)
Please come along to celebrate the diverse research going on within our School. All members of academic staff have been invited to give a 1-minute presentation on their research. This will be a challenge for them of course! The aim is to keep it light-hearted, with presentations pitched at the level of a physics undergraduate student. We will have a countdown clock to keep everyone to time. There will be snacks, and physics bingo (with prizes!).

---

Thursday 5th February at 1pm, A113 CAPT – Astronomy Lunch Talk

Jade Gray



Thursday 5th February at 2.45pm, A113 CAPT – Particle Cosmology Journal Club

---
Fridays at 4pm, CAPT Foyer – CAPT Cakes
---
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/>

[cid:image001.png at 01DC90F6.A713A7B0]

Follow us
facebook.com/uniofnottingham<http://facebook.com/TheUniofNottingham>
twitter.com/uniofnottingham<http://twitter.com/UniofNottingham>
youtube.com/nottmuniversity<http://youtube.com/nottmuniversity>
instagram.com/uniofnottingham<http://instagram.com/uniofnottingham>
linkedin.com/company/university-of-nottingham<http://linkedin.com/company/university-of-nottingham>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.nottingham.ac.uk/pipermail/astro/attachments/20260130/6145f7ec/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 190221 bytes
Desc: image001.png
URL: <http://lists.nottingham.ac.uk/pipermail/astro/attachments/20260130/6145f7ec/attachment-0001.png>
-------------- next part --------------
_______________________________________________
CAPT mailing list
CAPT at lists.nottingham.ac.uk
https://lists.nottingham.ac.uk/mailman/listinfo/capt