T2- inflation: Sourced by energy–momentum squared gravity
Mansoori S.A.H. Felegary F. Roshan M. Akarsu Ö. Sami M.
December 2023Elsevier B.V.
Physics of the Dark Universe
2023#42
In this paper, we examine chaotic inflation within the context of the energy–momentum squared gravity (EMSG) focusing on the energy–momentum powered gravity (EMPG) that incorporates the functional f(T2)∝(T2)β in the Einstein–Hilbert action, in which β is a constant and T2≡TμνTμν where Tμν is the energy–momentum tensor, which we consider to represent a single scalar field with a power-law potential. We also demonstrate that the presence of EMSG terms allows the single-field monomial chaotic inflationary models to fall within current observational constraints, which are otherwise disfavored by Planck and BICEP/Keck findings. We show that the use of a non-canonical Lagrangian with chaotic potential in EMSG can lead to significantly larger values of the non-Gaussianity parameter, fNlequi whereas EMSG framework with canonical Lagrangian gives rise to results similar to those of the standard single-field model.
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Faculty of Physics, Shahrood University of Technology, P.O. Box 3619995161, Shahrood, Iran
Department of Physics, Faculty of Science, Ferdowsi University of Mashhad, P.O. Box 1436, Mashhad, Iran
School of Astronomy, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran
Department of Physics, Istanbul Technical University, Maslak, Istanbul, 34469, Turkey
Centre for Cosmology and Science Popularization (CCSP), SGT University, Gurugram, Delhi- NCR, Haryana, 122505, India
Eurasian International Centre for Theoretical Physics, Astana, Kazakhstan
Chinese Academy of Sciences, 52 Sanlihe Rd, Xicheng District, Beijing, China
Faculty of Physics
Department of Physics
School of Astronomy
Department of Physics
Centre for Cosmology and Science Popularization (CCSP)
Eurasian International Centre for Theoretical Physics
Chinese Academy of Sciences
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