[Astro] [CAPT] CAPT Weekly Bulletin (w/c 17-11-25)

[Ella Batchelor (staff)]

Monday 17th November at 1pm, A113 CAPT – Astronomy Lunch Talk
Esin Gulbahar (FAU Erlangen- Nürnberg)
The SIXTE Simulator

SIXTE (Simulation of X-ray Telescopes) is a modular end-to-end software package for X-ray telescope observation simulations developed at the Remeis Observatory (ECAP). It allows to undertake instrument performance analyses and to produce simulated event files for mission and analysis studies. The software simulates the full detection chain from the astrophysical source through imaging and detection while finding a balance between exactness of the simulation and speed. For many cases, by using calibration files such as the PSF, RMF and ARF, efficient simulations are possible at comparably high speed, even though they include nonlinear effects such as pileup. In this talk I will give an introduction to the software, while demonstrating example usage of SIXTE in High Energy Astrophysics.



Monday 17th November at 3pm, A113 CAPT – Theoretical Physics Student Seminar

Thomas Martin

Modern Kinetic Theory

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Tuesdays at 11am, CAPT Foyer – Astro Coffee



Tuesday 18th November at 1pm, A113 CAPT – Particle Cosmology and Gravity Seminar

Benjamin Muntz

On the Geometry of Gravitational Effective Field Theories


Field space geometries — defined via the kinetic sector of an Effective Field Theory (EFT) — have recently become central to questions in swampland, amplitudes, cosmology, and philosophy of physics. When the EFT couples to gravity, however, the status of this geometry becomes ambiguous: the field space metric transforms non-trivially under Weyl transformations, obscuring how geometry behaves covariantly across otherwise equivalent conformal frames.

In this talk I present a new framework to resolve this ambiguity. I will explain how all possible conformal frames arise as different foliations of a particular higher-dimensional geometry. With the help of ADM, statements like frame- and unit transformations, as well as field excursions, receive a clean reinterpretation in differential-geometric language. This perspective also reveals precisely how gravity itself curves field space.

Time permitting, I will illustrate two applications of our formalism:

  *   First, I will prove the Species Scale Distance Conjecture and Sharpened Distance Conjecture, and argue that these are in fact universal statements of scalar-tensor theories rather than having to do with quantum gravity.
  *   Second, I will show how to quickly calculate scattering amplitudes in Higgs inflation. What is otherwise a lengthy derivation now boils down to computing just a single field space Riemann tensor.
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 19th November at 11am, A113 CAPT – CAPT Coding Club



Wednesday 19th November at 3:45pm, C4 Physics – Astronomy Weekly Seminar

Sean McGee (Birmingham)

Multi-Scale Pathways to Galaxy Quenching

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Thursday 20th November at 1pm, A113 CAPT – Astronomy Lunch Talk
Helen Russell
XRISM's first results

The X-ray Imaging and Spectroscopy Mission (XRISM) was launched by JAXA and NASA in late 2023.  XRISM carries onboard the next generation of X-ray instrumentation - the X-ray microcalorimeter.  With nearly two orders of magnitude improvement in spectral resolution over current CCD spectroscopy, XRISM is now revealing the dynamics of hot atmospheres in galaxy clusters.  I will review the first results from the performance verification phase and present our Cycle 1 observations of gas motions driven by AGN feedback in the Ophiuchus cluster.



Thursday 20th 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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