ϕ2 scalar field inflation in FLRW universe

In this article, we attempt to solve Einstein field equations minimally coupled to a ϕ 2 scalar field in closed, flat, and open FLRW space-time during the inflationary era. To achieve this, we introduce an auxiliary function of cosmic time and derive the Hubble parameter, scalar field, and scale fac...

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Bibliographic Details
Published in:Indian journal of physics 2024, Vol.98 (6), p.2243-2248
Main Authors: Alinezhadi, Nooshin, Asgari, Ali A., Abbassi, Amir H.
Format: Article
Language:English
Subjects:
Astrophysics and Astroparticles
Einstein equations
Hubble constant
Lower bounds
Original Paper
Physics
Physics and Astronomy
Scalars
Universe
Online Access:Get full text
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Summary:In this article, we attempt to solve Einstein field equations minimally coupled to a ϕ 2 scalar field in closed, flat, and open FLRW space-time during the inflationary era. To achieve this, we introduce an auxiliary function of cosmic time and derive the Hubble parameter, scalar field, and scale factor in terms of it. The universe undergoes remarkable accelerating expansion when the auxiliary function reaches a specific value. Additionally, we determine a lower bound on the scale factor at the onset of inflation for both open and closed cases. Finally, we estimate the mass of the inflaton and Hubble constant numerically. Our findings suggest that the scalar field oscillates after the inflationary period.
ISSN:0973-1458
0974-9845
DOI:10.1007/s12648-023-02990-8