[Astro] [CAPT] CAPT Weekly Bulletin (w/c 24-03-25)

Mon Mar 24 08:33:41 GMT 2025

Monday 24th March at 3pm, A113 CAPT – Theoretical Physics Student Seminar

Peter Du

Unitarisation from Geometry

---

Tuesdays at 11am, CAPT Foyer – Astro Coffee

Tuesday 25th March at 1pm, A113 CAPT – Particle Cosmology and Gravity Seminar
Peter Millington (University of Manchester)

Pseudo-Hermitian Quantum Field Theories from First Principles

It is now well established that quantum theories described by non-Hermitian Hamiltonians can exhibit real spectra and a unitary evolution.  The viability of these “pseudo-Hermitian” quantum theories often relies on the invariance of the Hamiltonian under antilinear spacetime symmetries; namely, the combined action of parity and time-reversal transformations.  Spacetime symmetries play a special role in quantum field theory, and this makes the second quantization of pseudo-Hermitian mechanics more intricate.  In this talk, I will describe how self-consistent pseudo-Hermitian quantum field theories can be built from first principles and highlight novel implications for high energy physics phenomenology.

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

The speaker will be also available for a discussion with students from 10:30 to 11:30 in A113
---
Wednesday 26th March at 3pm, B13 Physics – School Colloquium
Professor Jo Dunkley (Princeton)

New maps and cosmological results from the Atacama Cosmology Telescope

I will show new results from the Atacama Cosmology Telescope (ACT), including cosmological constraints and data products from the sixth data release, DR6. Using data gathered from 2017 - 2022, the new maps cover 40% of the microwave sky with five times the angular resolution and three times the depth in polarization as the Planck satellite. The improved cosmic microwave background (CMB) measurements at small scales complement the larger-scale information from Planck. I will describe how we use these datasets, along with tracers of large-scale-structure, to probe the fundamental physics of the universe across epochs and scales.

---

Thursday 27th March at 1pm, A113 CAPT – Astronomy Lunch Talk

Alfonso Aragon-Salamanca

The separate effect of halo mass and stellar mass on the evolution of massive disc galaxies

We analyse a sample of massive disc galaxies selected from the fourth-generation Sloan Digital Sky Survey/Mapping Nearby Galaxies at Apache Point Observatory survey to investigate how the evolution of these galaxies depends on their stellar and halo masses. We applied a semi-analytic spectral fitting approach to the data from different regions in the galaxies to derive several of their key physical properties. From the best-fitting model results, together with direct observables such as morphology, colour, and the Mgb/<Fe> index ratio measured within 1Re , we find that for central galaxies both their stellar and halo masses have a significant influence in their evolution. For a given halo mass, galaxies with higher stellar mass accumulate their stellar mass and become chemically enriched earlier than those with smaller stellar mass. Furthermore, at a given stellar mass, galaxies living in more massive haloes have longer star formation time-scales and are delayed in becoming chemically enriched. In contrast, the evolution of massive satellite galaxies is mostly determined by their stellar mass. The results indicate that both the assembled halo mass and the halo assembly history impact the evolution of central galaxies. Our spatially resolved analysis indicates that only the galaxy properties in the central region (0.0–0.5 Re ) show the dependencies described above. This fact supports a halo-driven formation scenario since the galaxies’ central regions are more likely to contain old stars formed along with the halo itself, keeping a memory of the halo formation process.

Thursday 27th March at 3pm, A113 CAPT – Particle Cosmology Journal Club

Student Journal Club

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

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 01DB97E4.E71C2280]

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/20250324/66fcf963/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/20250324/66fcf963/attachment-0001.png>
-------------- next part --------------
_______________________________________________
CAPT mailing list
CAPT at lists.nottingham.ac.uk
https://lists.nottingham.ac.uk/mailman/listinfo/capt