Relativistic Evolution of Dark Matter

Mondal, Rajrupa (2023) Relativistic Evolution of Dark Matter. Masters thesis, Indian Institute of Science Education and Research Kolkata.

[img] Text (MS dissertation of Rajrupa Mondal (18MS099))
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Historically in dark matter studies, a non-relativistic freeze-out of dark matter particles has often been assumed. In such cases, the Maxwell-Boltzmann statistics are used to describe the equilibrium phase space distribution of the particle. However, this assumption does not hold in general non-WIMP models, where freeze-out can take place at relativistic momenta. This necessitates the addition of full quantum statistics, in the form of Fermi-Dirac or Bose-Einstein distributions, wherever applicable. The goal of the thesis is to account for quantum statistical effects in a simple extension of the Standard Model. It includes a fermion ν as a dark matter candidate and an unstable scalar s. The number density of ν is controlled by a 2 → 2 process where the fermion annihilates into the dark scalars and freeze out can occur in the relativistic regime. The thesis analyzes the corresponding relativistic reaction rate based on the Fermi-Dirac and Bose-Einstein distributions.

Item Type: Thesis (Masters)
Additional Information: Supervisor: Oleg Lebedev, University of Helsinki; Co-supervisor: Koushik Dutta
Uncontrolled Keywords: Dark Matter; Maxwell-Boltzmann Statistics; Particle Physics; Standard Model
Subjects: Q Science > QC Physics
Divisions: Department of Physical Sciences
Depositing User: IISER Kolkata Librarian
Date Deposited: 16 Jan 2024 11:14
Last Modified: 16 Jan 2024 11:14

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