| Grant number: | 22/00404-3 |
| Support Opportunities: | Regular Research Grants |
| Start date: | July 01, 2022 |
| End date: | June 30, 2024 |
| Field of knowledge: | Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields |
| Agreement: | 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 |
Abstract
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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