Abstract
We propose a minimal extension of the standard model of particle physics to accommodate cosmic inflation, dark matter and light neutrino masses. While the inflationary phase is obtained from a modified chaotic inflation scenario, consistent with latest cosmology data, the dark matter particle is a fermion singlet which remains out of equilibrium in the early universe. The scalar field which revives the chaotic inflation scenario by suitable modification also assists in generating tiny couplings of dark matter with its mother particle, naturally realizing the non-thermal or freeze-in type dark matter scenario. Interestingly, the same assisting scalar field also helps in realizing tiny Yukawa couplings required to generate sub-eV Dirac neutrino mass from neutrino couplings to the standard model like Higgs field. The minimality as well as providing a unified solution to all three problems keep the model predictive at experiments spanning out to all frontiers.
Highlights
Several experimental evidences from cosmological and astrophysical experiments strongly favor the presence of a large amount of the nonbaryonic form of matter dubbed as dark matter (DM) in the present universe [1]
We have proposed a unified framework to account for nonthermal dark matter, modified chaotic inflation, and sub–electron volt Dirac neutrino mass by minimally extending the standard model
The same additional scalar field assists in generating required tiny couplings for nonthermal DM as well as Dirac neutrino mass by virtue of Planck scale suppressed dimension five operators
Summary
Several experimental evidences from cosmological and astrophysical experiments strongly favor the presence of a large amount of the nonbaryonic form of matter dubbed as dark matter (DM) in the present universe [1]. Radiative corrections to the inflationary potential [16,17,18], nonminimal coupling of the inflaton with gravity [19,20,21], or logarithmic mass correction of the inflaton [22,23] could bring down the value of r within the Planck limit as well as keeping ns within the allowed range Another interesting proposal exists, where the inflation sector is extended by an additional scalar field [24,25]. The energy transfer of inflaton to relativistic matter fields can be realized through the nonperturbative preheating process or the perturbative decay of inflaton It was shown in [26] that thermalization of the universe through instant preheating could be one simple and elegant scenario for the Z2-odd chaotic inflation model.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
