[Astro] [CAPT] Particle Cosmology and Gravity Seminar this week: Bruno Alexandre (Imperial College London)

[Swagat Mishra]

Dear All,
          Here are the details of the seminar this week -

Speaker: Bruno Alexandre (Imperial College London)

Seminar Date: 10th December, Tuesday 1.00 pm

 Venue: Seminar Room A 113  (Cripps North Building)

 Title:  Higgs Mechanism for the Ashtekar Self-Dual Connection

Abstract:

We introduce the Higgs mechanism for the self-dual spin connection (also known as the Ashtekar connection), using the Plebanski formulation of gravity. We develop our formalism within the framework of the chiral action and derive the equations of motion of the theory. One particular test

model is explored: since anisotropy is an intrinsic property of the theory, a modified version of the spatially flat Bianchi I model with two different scale factors is considered. We apply our formalism and derive the Friedmann equations which regulate the scale factors and the Higgs field. We also

present a Proca-like term for the connection, which when reduced to minisuperspace with a positive Λ yields a De Sitter universe with an effective cosmological constant that depends on the mass of

the gauge fields. We finally investigate the effect of these mass terms on gravitational waves and find that the wave equation remains unchanged relatively to GR; however the Weyl tensor is scaled by a constant which depends on the mass of the connection components.


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



With Regards,
-Swagat







Swagat Saurav Mishra,

Postdoctoral Research Associate

​

Particle Cosmology Group,

Centre for Astronomy and Particle Theory,

University of Nottingham, Nottingham NG7 2RD, UK.

Website: https://swagatam18.wordpress.com/

Research Link:https://inspirehep.net/authors/1517353

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