T2- inflation: Sourced by energy–momentum squared gravity

Seyed Ali Hosseini Mansoori; Fereshteh Felegary; Mahmood Roshan; Özgür Akarsu; Mohammad Sami

doi:10.1016/j.dark.2023.101360

T²- inflation: Sourced by energy–momentum squared gravity

Seyed Ali Hosseini Mansoori, Fereshteh Felegary, Mahmood Roshan^*, Özgür Akarsu, Mohammad Sami

^*Corresponding author for this work

Department of Physics Engineering

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

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≡T_μνT^μν where T_μν 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, f_Nl^equi whereas EMSG framework with canonical Lagrangian gives rise to results similar to those of the standard single-field model.

Original language	English
Article number	101360
Journal	Physics of the Dark Universe
Volume	42
DOIs	https://doi.org/10.1016/j.dark.2023.101360
Publication status	Published - Dec 2023

Bibliographical note

Publisher Copyright:
© 2023 Elsevier B.V.

Funding

The authors thank Hassan Firouzjahi, Shahab Shahidi, Zahra Haghani, Sayantan Choudhury, Mohamad Ali Gorji, Alireza Talebian, and Phongpichit Channuie for the useful comments and discussions. SAH and FF acknowledge the partial support from the “Saramadan” federation of Iran. The research of MR is supported by the Ferdowsi University of Mashhad, Iran . Ö.A. acknowledges the support by the Turkish Academy of Sciences in scheme of the Outstanding Young Scientist Award (TÜBA-GEBİP). MS is supported by Science and Engineering Research Board (SERB), India , DST, Government of India under the Grant Agreement number CRG/2022/004120 (Core Research Grant). MS is also partially supported by the Ministry of Education and Science of the Republic of Kazakhstan , Grant No. AP14870191 and CAS President’s International Fellowship Initiative (PIFI) .

Funders	Funder number
TÜBA-GEBİP
Department of Science and Technology, Ministry of Science and Technology, India	CRG/2022/004120
Science and Engineering Research Board
Chinese Academy of Sciences
Ferdowsi University of Mashhad
Türkiye Bilimler Akademisi
Ministry of Education and Science of the Republic of Kazakhstan	AP14870191

Access to Document

10.1016/j.dark.2023.101360

Cite this

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title = "T2- inflation: Sourced by energy–momentum squared gravity",

abstract = "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.",

author = "Mansoori, {Seyed Ali Hosseini} and Fereshteh Felegary and Mahmood Roshan and {\"O}zg{\"u}r Akarsu and Mohammad Sami",

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AU - Mansoori, Seyed Ali Hosseini

AU - Felegary, Fereshteh

AU - Roshan, Mahmood

AU - Akarsu, Özgür

AU - Sami, Mohammad

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