Inflation in Energy-Momentum Squared Gravity in Light of Planck2018

Faraji, Marzieh; Rashidi, Narges; Nozari, Kourosh

doi:10.48550/arxiv.2107.13547

Cited by 3 publications

(3 citation statements)

References 53 publications

(75 reference statements)

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“…[24][25][26][27][28][29][30][31][32][33][34][35][36][37] and references therein. In this regard, various modified theories of gravity have also been considered for inflationary cosmology in the hope that their predictions can better justify the observational data [38][39][40][41][42][43][44][45][46][47][48][49][50][51].…”

Section: Introductionmentioning

confidence: 99%

Cosmological Inflation in f(Q, T) Gravity

Shiravand,

Fakhry,

Farhoudi

2022

Preprint

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We study the cosmological inflation within the context of f (Q, T ) gravity, wherein Q is the nonmetricity scalar and T is the trace of the matter energy-momentum tensor. By choosing a linear combination of Q and T , we first analyze the realization of an inflationary scenario driven via the geometrical effects of f (Q, T ) gravity and then, we obtain the modified slow-roll parameters, the scalar and the tensor spectral indices, and the tensor-to-scalar ratio for the proposed model. In addition, by choosing a few appropriate inflationary potentials and by applying the slow-roll approximations, we calculate these inflationary observables in the presence of an inflaton scalar field. The results indicate that by properly restricting the free parameters, the proposed model provides appropriate predictions that are consistent with the observational data obtained from the Planck 2018.

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Section: Introductionmentioning

confidence: 99%

Cosmological Inflation in f(Q, T) Gravity

Shiravand,

Fakhry,

Farhoudi

2022

Preprint

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“…Such matter-geometry coupling explains different eras of the universe as well as the rotation curves of galaxies. Faraji et al [41] used Friedmann-Lemaitre-Robertson-Walker (FLRW) metric to observe the effect of coupling parameter and found that the range (0, 2.1 × 10 5 ] provides observationally viable inflationary model. Several remarkable results have also been obtained by using the Kuchowicz metric in this scenario [42].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic tolman V solutions by decoupling approach in f(R,T ²) gravity

Sharif¹,

Iltaf²

2022

Phys. Scr.

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This paper investigates the behavior of anisotropic static spheres that are constructed by employing a minimal geometric deformation in the framework of f(R,T^{2}) gravity ($T^{2}=T_{\zeta\nu}T^{\zeta\nu}$, $R$ is the Ricci scalar and $T_{\zeta\nu}$ is the energy-momentum tensor). We consider a spherical setup with two sources: seed and additional. It is assumed that the seed source is isotropic whereas the new source is responsible for inducing anisotropy. We deform the $g_{rr}$ component to split the field equations into two sets. The first array corresponds to the isotropic solution whereas the second set contains the effect of the anisotropic source. The system related to isotropic source is determined by the metric potentials of Tolman V solution while three solutions of the second set are constructed corresponding to three different constraints. The physical acceptability of all solutions is checked through energy conditions by employing the mass and radius of PSR J1614-2230 star. We also examine the stability, mass, compactness and redshift of the obtained solutions. We conclude that first two solutions satisfy the viability and stability criteria only for small values of the decoupling parameter while third solution is stable for its all possible values.

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“…It would be interesting to note that in the framework of inflationary cosmology, the numerical analysis done on the perturbation parameters of the EMSG model has shown that it can be a viable potential candidate from the view of Planck2018 data[100]. Note that this does not mean that the modified gravity model at hand is problem-free.…”

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confidence: 99%