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Baryogenesis and dark matter in nonstandard cosmology

Grant number: 22/00404-3
Support Opportunities:Regular Research Grants
Duration: July 01, 2022 - June 30, 2024
Field of knowledge:Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
Convênio/Acordo: Texas A&M University
Mobility Program: SPRINT - Projetos de pesquisa - Mobilidade
Principal Investigator:Chee Sheng Fong
Grantee:Chee Sheng Fong
Principal researcher abroad: Bhaskar Dutta
Institution abroad: Texas A&M University, United States
Host Institution: Centro de Ciências Naturais e Humanas (CCNH). Universidade Federal do ABC (UFABC). Ministério da Educação (Brasil). Santo André , SP, Brazil
Associated research grant:19/11197-6 - Precision test of baryogenesis, AP.JP


In the standard cosmological model, after inflation, the Universe is radiation dominated up till the matter-radiation equality when the cosmic radiation temperature is around 10 eV. In fact, the earliest evidence we have that the Universe is indeed radiation dominated is from the measurements of the abundances of light elements produced from the Big Bang Nucleosynthesis (BBN) when the cosmic temperature is around MeV. From the period after inflation up till MeV temperature, the Universe could as well go through a period of expansion not described by the standard radiation dominated scenario, the so-called “nonstandard cosmology". Hence, nonstandard cosmology includes several well-motivated scenarios like modifications to general relativity as in scalar-tensor theories of gravitation, a period of matter domination due to existence of long-lived massive particles and/or Primordial Black Holes (PBHs), first order phase transitions etc. In order to probe these possibilities, one needs to study phenomena which occur before the BBN such as baryogenesis and dark matter production. The main aim of this proposal is to study how nonstandard cosmology can leave traces and affect baryogenesis and dark matter production. In this context, scenarios involving PBHs which can constitute part of or all the dark matter will be studied. We would like to study the correlated signatures in gravitational waves originated from the PBH production or the subsequent mergers of PBHs as well as gamma rays from the Hawking radiations of the PBHs. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
FONG, CHEE SHENG; RAHAT, MOINUL HOSSAIN; SAAD, SHAIKH. BBN photodisintegration constraints on gravitationally produced vector bosons. Journal of High Energy Physics, v. N/A, n. 11, p. 33-pg., . (22/00404-3, 19/11197-6)
FONG, CHEE SHENG. Analytic neutrino oscillation probabilities. SCIPOST PHYSICS, v. 15, n. 1, p. 17-pg., . (19/11197-6, 22/00404-3)

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