Inflation with an Antisymmetric Tensor Field

Aashish, Sandeep; Padhy, Abhilash; Panda, Sukanta; Rana, Arun

doi:10.1007/978-981-33-4408-2_52

Cited by 2 publications

(3 citation statements)

References 11 publications

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“…The acceleration of the scale factor turns out negative and inflation does not occur. This result is in agreement with [58], which states that a minimal model with an antisymmetric tensor field (in the Einstein frame) is not consistent with inflation. However, authors from [58] showed that a stable de-Sitter solution can be achieved in the context of antisymmetric tensor field by introducing a non-minimal coupling between the Ricci scalar and the tensor field.…”

Section: Spectral Index Tensor To Scalar Ratio and Number Of E-foldin...supporting

confidence: 89%

“…However, authors in Ref. [58] showed that a stable de-Sitter solution can be achieved in the context of antisymmetric tensor fields, by introducing a non-minimal coupling between the Ricci scalar and the tensor field. On the other hand, in the present paper, we argue that the minimal prescription (in the presence of an antisymmetric tensor field) can also give rise to an inflationary era, but in the presence of quadratic-curvature gravity.…”

Section: Discussionmentioning

confidence: 99%

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Inflationary universe in F(R) gravity with antisymmetric tensor fields and their suppression during its evolution

et al. 2019

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The intriguing question, why the present scale of the universe is free from any perceptible footprints of rank-2 antisymmetric tensor fields? (generally known as Kalb-Ramond fields) is addressed. A quite natural explanation of this issue is given from the angle of higher-curvature gravity, both in four-and in five-dimensional spacetime. The results here obtained reveal that the amplitude of the Kalb-Ramond field may be actually large and play a significant role during the early universe, while the presence of higher-order gravity suppresses this field during the cosmological evolution, so that it eventually becomes negligible in the current universe. Besides the suppression of the Kalb-Ramond field, the extra degree of freedom in F (R) gravity, usually known as scalaron, also turns out to be responsible for inflation. Such F(R) gravity with Kalb-Ramond fields may govern the early universe to undergo an inflationary stage at early times (with the subsequent graceful exit) for wider range of F(R) gravity than without antisymmetric fields.. Furthermore, the models-in fourand five-dimensional spacetimes-are linked to observational constraints, with the conclusion that the corresponding values of the spectral index and tensor-to-scalar ratio closely match the values provided by the Planck survey 2018 data.

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Section: Spectral Index Tensor To Scalar Ratio and Number Of E-foldin...supporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Inflationary universe in F(R) gravity with antisymmetric tensor fields and their suppression during its evolution

et al. 2019

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“…To explain away the remainder of the issues, multitudes of inflationary models have been proposed over the past few decades [12,13]. For modifications on the matter side, these include noncanonical scalar models [14], or models that replace the scalar field with, say, a JCAP01(2023)029 massive vector field [15][16][17][18], fermionic field [19][20][21][22], antisymmetric tensor field [23][24][25][26][27], and models involving nonminimal couplings with these fields, all of which require the introduction of new physics. Apart from these, there have been several propositions that hold the Standard Model of particle physics to be fundamental and intend not to modify that and instead propose modifications on the gravity side.…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet unitarity violations in non-minimally coupled scalar-Starobinsky inflation

Panda

Altafhussain

Vidyarthi

2023

J. Cosmol. Astropart. Phys.

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We perform the calculation for tree-level ultraviolet unitarity violation scales for scalar-R 2 inflation models by including an additional R 2|Φ|2-type term. Due to certain constraints, we resort to the Einstein frame for our calculations, where we separate our analysis between metric and Palatini formulations. We follow recent works in this line that debunk the naive predictions for unitarity violations in Higgs' inflation models to determine how to accurately estimate the behaviour of scattering amplitudes in the UV limit. Later, we work out different cases by assuming potentials corresponding to known inflation scenarios so we could predict the range of coupling parameters for which the theories would remain unitary up to the Planckian regime. We also try to find the behaviour of the scattering amplitudes for these theories during the transition from inflationary to reheating epoch.

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Inflation with an Antisymmetric Tensor Field

Cited by 2 publications

References 11 publications

Inflationary universe in F(R) gravity with antisymmetric tensor fields and their suppression during its evolution

Inflationary universe in F(R) gravity with antisymmetric tensor fields and their suppression during its evolution

Ultraviolet unitarity violations in non-minimally coupled scalar-Starobinsky inflation

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