[Astro] [CAPT] CAPT Weekly Bulletin (w/c 17-02-25)

[Ella Batchelor]

Monday 17th February at 3pm, A113 CAPT – Theoretical Physics Student Seminar
Usama Aqeel

Blowing Bubbles in Euclidean Spacetime

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Tuesdays at 11am, CAPT Foyer – Astro Coffee



Tuesdays at 11.30am, A113 CAPT - Astronomy Journal Club



Tuesday 18th February at 1pm, A113 CAPT – Particle Cosmology and Gravity Seminar
John Carlton (King’s College London)
Massive graviton dark matter searches with long-baseline atom interferometers

Atom interferometers offer exceptional sensitivity to ultra-light dark matter (ULDM) through their precise measurement of phenomena acting on atoms. Previous work has established their capability to detect scalar and vector ULDM, but their potential for detecting spin-2 ULDM has until recently remained unexplored. In this talk I will introduce the sensitivity of atom interferometers to spin-2 ULDM by considering several frameworks for massive gravity: a Lorentz-invariant Fierz-Pauli case and two Lorentz-violating scenarios. Coherent oscillations of the spin-2 ULDM field induce a measurable phase shift through three distinct channels: coupling of the scalar mode to atomic energy levels, and vector and tensor effects that modify the propagation of atoms and light. Atom interferometers uniquely probe all of these effects, while providing sensitivity to a different mass range from laser interferometers. These results demonstrate an exciting new theory target for atom interferometers and other quantum sensors to explore. I will also discuss challenges faced by these experiments from environmental noise.

Links 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 February at 3.45pm, C4 Physics – Astronomy Seminar

Andy Young (Bristol)
X-raying Black Hole Accretion Flows

X-ray observations of black hole accretion flows can be used to study the accretion disc, corona, and black hole spacetime. I will explain how a combination of spectroscopy and timing can be used to measure black hole spin, mass, and geometry of the accretion flow. However, existing models are incomplete because they cannot self-consistently explain all the features of observations, or model “realistic” disc and corona geometries. I will describe our recent work on producing fast, flexible, numerical models that we plan to fit to X-ray spectral timing data.


Wednesday 19th February at 6pm, Arts Lecture Theatre – Cosmic Titans: Dark Side of the Universe (Evening Talk)
£3 (free concessions)
Running Time: 1 hour

Professor Edward Daw, University of Sheffield, discusses the search for signatures of dark matter particles.

Joining the conversation will be artists Daniela Brill Estrada and Monica C. LoCascio, who collaborate in their quest to give poetic material form to the invisible.

For more information and to book, please click here<https://www.lakesidearts.org.uk/event/dark-side-of-the-universe/>.
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Thursday 20th February at 1pm– Visit to Cosmic Titans exhibition at Lakeside Arts

Leaving CAPT at 1pm, returning no longer than 1:45pm



Thursday 20th February 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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