Tachyon warm inflation with the effects of loop quantum cosmology in the light of Planck 2015

Kamali, Vahid; Basilakos, Spyros; Mehrabi, Ahmad; Motaharfar, Meysam; Massaeli, Erfan

doi:10.1142/s0218271818500566

Cited by 8 publications

(9 citation statements)

References 90 publications

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“…Previous studies on both CI and WI in the context of LQC showed interesting features regarding properties of the pre-inflationary phase and the start of inflation itself [49][50][51][52][53][54][55][56][57][58]. In the present work we focus for the first time on the problem of confronting the observational predictions of WI in LQC with the latest CMB data.…”

Section: Introductionmentioning

confidence: 87%

Observational constraints on warm inflation in loop quantum cosmology

Benetti

Graef

Ramos

2019

J. Cosmol. Astropart. Phys.

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By incorporating quantum aspects of gravity, Loop Quantum Cosmology (LQC) provides a selfconsistent extension of the inflationary scenario, allowing for modifications in the primordial inflationary power spectrum with respect to the standard General Relativity one. We investigate such modifications and explore the constraints imposed by the Cosmic Microwave Background (CMB) Planck Collaboration data on the Warm Inflation (WI) scenario in the LQC context. We obtain useful relations between the dissipative parameter of WI and the bounce scale parameter of LQC. We also find that the number of required e-folds of expansion from the bounce instant till the moment the observable scales crossed the Hubble radius during inflation can be smaller in WI than in CI. In particular, we find that this depends on how large is the dissipation in WI, with the amount of required e-folds decreasing with the increasing of the dissipation value. Furthermore, by performing a Monte Carlo Markov Chain analysis for the considered WI models, we find good agreement of the model with the data. This shows that the WI models studied here can explain the current observations also in the context of LQC.

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Section: Introductionmentioning

confidence: 87%

Observational constraints on warm inflation in loop quantum cosmology

Benetti

Graef

Ramos

2019

J. Cosmol. Astropart. Phys.

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“…In particular, in this work we treated the spinor fields classically, assuming them to lie at the minimal state, namely being cold. Nevertheless, incorporation of high-temperature effects, as for example in the case of warm inflation [40,41], could lead to the ap-pearance of an additional friction term, and this could further improve the values of the spectral index and the tensor-to-scalar ratio. Another possible generalization is to consider a quadratic curvature dependence, alongside the linear one, in the fermion mass, or even more general functions of the form m eff = f (m 0 , R).…”

Section: Discussionmentioning

confidence: 99%

Inflation from fermions with curvature-dependent mass

et al. 2019

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A model of inflation realization driven by fermions with curvature-dependent mass is studied. Such a term is derived from the Covariant Canonical Gauge Theory of gravity (CCGG) incorporating Dirac fermions. We obtain an initial de Sitter phase followed by a successful exit, and moreover we acquire the subsequent thermal history, with an effective matter era, followed finally by a darkenergy epoch. This behavior is a result of the effective "weakening" of gravity at early times, due to the increased curvature-dependent fermion mass. Investigating the scenario at the perturbation level, using the correct coupling parameter, the scalar spectral index and tensor-to-scalar ratio are obtained in agreement with Planck observations. Moreover the BBN constraints are satisfied too. The efficiency of inflation from fermions with curvature-dependent mass, at both the background and perturbation level, reveals the capabilities of the scenario and makes it a good candidate for the description of nature.

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“…Many studies have investigated warm inflation in the LQC scenario. [49][50][51][52][53][54][55][56][57] Warm inflation in the LQC scenario was introduced first in Ref. 49, in which the dissipation coefficient Γ = constant and the number of e-folds depends on the tensor-scalar ratio r for a given scalar field mass m.…”

Section: Frameworkmentioning

confidence: 99%

“…tachyon warm inflation. 50,55,59 The existing work mainly discusses the characteristics of warm inflation in LQC scenario, but the pre-inflation dynamical behavior does not take into account. We will investigate the pre-inflation dynamical behavior of warm inflation in this paper.…”

Section: Frameworkmentioning

confidence: 99%

“…[44][45][46][47][48] Additionally, different warm inflation models have been investigated in the LQC scenario. [49][50][51][52][53][54][55][56][57] As in the case of standard inflation, the probability of warm inflation is close to 1 in the LQC scenario when considering the cubic dissipation coefficient Γ cubic = C 3 T 3 /φ 2 and linear dissipation coefficient Γ linear = C 1 T . 56 Although many works have discussed warm inflation in the LQC scenario, the pre-inflation dynamical behavior of the warm inflation has not been studied.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pre-inflation dynamical behavior of warm inflation in loop quantum cosmology

Xiao

Wang

2020

Mod. Phys. Lett. A

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Considering a constant dissipative coefficient [Formula: see text], the pre-inflation dynamical behaviors of warm inflation in the loop quantum cosmology scenario are discussed. We consider three sets of initial conditions. The evolution of the background can always be divided into three phases, namely super-inflation, damping, and slow-roll inflation phases, with the duration of each phase depending on the initial conditions. As an example, we compare the background evolution between [Formula: see text] and [Formula: see text] under special initial conditions and find that there is no slow-roll inflation phase for [Formula: see text] while the number of e-folds is about 60.209 for [Formula: see text].

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Tachyon warm inflation with the effects of loop quantum cosmology in the light of Planck 2015

Cited by 8 publications

References 90 publications

Observational constraints on warm inflation in loop quantum cosmology

Observational constraints on warm inflation in loop quantum cosmology

Inflation from fermions with curvature-dependent mass

Pre-inflation dynamical behavior of warm inflation in loop quantum cosmology

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