Khaothong Seminar Series

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Seminar Organizer: Kumar Abhinav
Previous Series Lists [Series 1, Series 2, Series 3]


Series 4

15:00-16:30 Hrs Indo-China time on May 29, 2023
Speaker: Dr. Masroor Pookkillath, NAS-MU
TitleExtended minimal theories of massive gravity.
Abstract: Cosmological surveys show that the $\Lambda$CDM model is the most favoured model of our universe. However, this model doesn’t explain the physical origin of the dark sectors. The recent growing tensions in cosmology, Hubble tension, and $S_{8}$ tension obstructs our understanding of the dark sectors. Modified Gravity theories are promising candidates to address the above issues.

I introduce a class of extended minimal theories of massive gravity. To understand how the effective gravitational force works for this theory, we investigate cosmological scalar perturbations. We then restrict the models by imposing the following conditions at all times: (1) define an effective gravitational constant, $G_{\text{eff}}$; (2) the value $G_{\text{eff}}/G_{\text{N}}$ is finite but not always equal to unity, and (3) the square of the mass of the graviton is always positive. Finally, we focus on a subclass of such theories and show they have a rich and compelling phenomenology.

Sl. No. Date & Time Title Speaker/Affiliation
1 February 6th 2023
14:00-15:30 ICT
 An economical solution to the neutrino mass, muon g-2 and W-boson mass problems Dr. Patipan Uttayarat
Srinakharinwirot University
February 20th 2023
14:00-15:30 ICT
Complex KdV breathers from PT-symmetric structures obtained through supersymmetry Dr. Kumar Abhinav
March 6th 2023
14:00-15:30 ICT
Pre-inflationary background dynamics in loop quantum cosmology Dr. Manabendra Sharma
March 27th 2023
14:00-15:30 ICT
Introduction to Multilayer and Multiplex Networks Dr. Pradeepp Bhadola
April 10th 2023
14:00-15:30 ICT
Interacting dark sectors: a dynamical system perspective Dr. Nandan Roy
May 29th 2023
15:00-16:30 ICT
Extended minimal theories of massive gravity Dr. Masroor Pookkillath                                NAS-MU