[Astro] [Particles] Particle Cosmology Seminar on coming Friday: Poulami Dutta Roy, CMI, India

[Swagat Mishra]

A gentle reminder of today's seminar.



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

________________________________
From: Particles <particles-bounces at lists.nottingham.ac.uk> on behalf of Swagat Mishra <Swagat.Mishra at nottingham.ac.uk>
Sent: 10 June 2024 09:09
To: astro at nottingham.ac.uk <astro at nottingham.ac.uk>; particles at nottingham.ac.uk <particles at nottingham.ac.uk>; maths-quantum-gravity-group at lists.nottingham.ac.uk <maths-quantum-gravity-group at lists.nottingham.ac.uk>; O365-Gravity Laboratory <o365-gravitylaboratory at UniofNottm.onmicrosoft.com>
Cc: Poulami Dutta Roy <sonai.duttaroy at gmail.com>; Ella Batchelor (staff) <ppzeb1 at exmail.nottingham.ac.uk>
Subject: [Particles] Particle Cosmology Seminar on coming Friday: Poulami Dutta Roy, CMI, India

 Dear All,
    We have an in-person seminar on the coming Friday (14th June)  by Poulami Dutta Roy from Chennai mathematical institute (CMI), India. This will be the last seminar for this term.

Venue: A113 (2 pm on Friday 14th June)

Title: Parametrized tests of GR: Extension to 4PN order and Principal Component Analysis

Abstract: Parametrized tests of post-Newtonian (PN) theory have been very efficient in testing GR in the inspiral phase of compact binary dynamics. In this test, one introduces null-valued deformation coefficients at each PN order in the inspiral phase, and their consistency with zero is assessed using gravitational wave data. In the first half of the talk, we will discuss the recently computed 4PN and 4.5PN inspiral phase terms that carry information about new physical effects like the tail-of-memory, spin-quadrupolar tails and quartic-tail effects and the extension of single-parameter test of GR to these orders. We introduce four new deformation parameters at these PN orders and compute the bounds on them through the Fisher analysis for the current-generation detectors such as LIGO/Virgo, next-generation (XG) detectors such as Cosmic Explorer/Einstein Telescope and LISA. Gravitational waves from supermassive BHs observed in LISA provide the tightest projected constraints ranging from O(10−4 −10−2 ) for the four different parameters. In the second segment, we focus on multi-parameter tests, i.e., simultaneous estimation of deformation parameters occurring at all PN orders and understand the associated problems due to their correlations. One possible resolution is shifting to a suitable basis obtained through Principal Component Analysis (PCA), which is the best-measured orthogonal linear combination of the original deformation parameters. We performed an extensive study of zero-noise GR and non-GR injections, that highlights the efficiency of PCA over the usual parametrized test in constraining GR deviations. Our study, therefore, highlights the advancements in parametrized tests to probe consistency with GR through current and future gravitational wave observations.


Link to join online:


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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