Anisotropic power-law inflation for a conformal-violating Maxwell model

Tuan, Q.; Kao, W. F.

doi:10.1140/epjc/s10052-018-5846-5

Cited by 16 publications

(17 citation statements)

References 133 publications

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“…Notice that to see that u is positive in this limit (as required) one needs to include the next to leading order term in the large n expansion for ζ± 5. This has been confirmed recently in[24] 6. We focus only on solutions with |n| ≥ 1, which guarantees real values for w in the λ > 0 we are interested in.…”

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confidence: 65%

Anisotropic inflation with derivative couplings

2018

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We study anisotropic power-law inflationary solutions when the inflaton and its derivative couple to a vector field. This type of coupling is motivated by D-brane inflationary models, in which the inflaton, and a vector field living on the D-brane, couple disformally (derivatively). We start by studying a phenomenological model where we show the existence of anisotropic solutions and demonstrate their stability via a dynamical system analysis. Compared to the case without a derivative coupling, the anisotropy is reduced and thus can be made consistent with current limits, while the value of the slow-roll parameter remains almost unchanged. We also discuss solutions for more general cases, including D-brane-like couplings.

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confidence: 65%

Anisotropic inflation with derivative couplings

2018

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“…to see whether a spatial anisotropy of spacetime exists or not [36][37]. As a result, an action of a new conformal-violating Maxwell model is given by [36][37]…”

Section: A New Conformal-violating Maxwell Modelmentioning

confidence: 99%

“…Using the same setup for the metric and fields of the KSW model, we are able to define explicit components of the Einstein field equation to be [36]…”

Section: A New Conformal-violating Maxwell Modelmentioning

confidence: 99%

“…By choosing the function   0 n J X J X  and employing all setup for the metric and fields used in the KSW model, we are able to obtain the following analytical anisotropic power-law solution as [36]  …”

Section: A New Conformal-violating Maxwell Modelmentioning

confidence: 99%

“…Hence, we might think that the violation of isotropy is closely related to the violation of conformal invariance during the inflationary phase of our universe. In the light of this observation, we has proposed a new model [36][37], in which the kinetic term of scalar field defined as 2 X       is coupled to the electromagnetic field as  …”

Section: Introduction mentioning

confidence: 99%

See 2 more Smart Citations

On the Validity of the Cosmic No-hair Conjecture in some Conformal-violating Maxwell Models

Tuan

2019

MaP

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We will present main results of our recent investigations on the validity of the cosmic no-hair conjecture proposed by Hawking and his colleagues in some conformal-violating Maxwell models, in which a scalar field or its kinetic term is non-trivially coupled to the electromagnetic field. In particular, we will show that the studied models really admit the Bianchi type I metrics, which are homogeneous but anisotropic space time, as their stable cosmological solutions. Hence, these models turn out to be counterexamples to the cosmic no-hair conjecture. Keywords: Cosmic no-hair conjecture, cosmic inflation, Bianchi type I space time, Maxwell theory.

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Cosmological quantum entanglement: a possible testbed for the existence of Kalb–Ramond field

Paul¹,

Banerjee²

2020

Class. Quantum Grav.

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In the present paper, we explore the possible effects of a second rank antisymmetric tensor field, known as Kalb–Ramond (KR) field, on cosmological particle production as well as on quantum entanglement for a massive scalar field propagating in a four dimensional FRW spacetime evolves through a symmetric bounce. For this purpose, the scalar field is considered to be coupled with the KR field and also with the Ricci scalar via the term ∼ξRΦ2 (with ξ be the coupling). The presence of KR field spoils the conformal symmetry of a massless scalar field even for ξ = 1/6 in four dimensional context, which has interesting consequences on particle production and consequently on quantum entanglement as we will discuss. In particular, the presence of KR field in an FRW bouncing Universe allows a greater particle production and consequently the upper bound of the entanglement entropy becomes larger in comparison to the case when the KR field is absent. This may provide an interesting testbed for the existence of Kalb–Ramond field in our Universe.

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Anisotropic power-law inflation for a conformal-violating Maxwell model

Cited by 16 publications

References 133 publications

Anisotropic inflation with derivative couplings

Anisotropic inflation with derivative couplings

On the Validity of the Cosmic No-hair Conjecture in some Conformal-violating Maxwell Models

Cosmological quantum entanglement: a possible testbed for the existence of Kalb–Ramond field

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