Entropy generation in the early universe by dissipative processes near the Higgs phase transition

Fang, Li

doi:10.1016/0370-2693(80)90421-9

Cited by 77 publications

(77 citation statements)

References 8 publications

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“…In fact, along with the rapid development of observational cosmology since the late 1990s, cosmologists believe that the universe may have undergone two phases of cosmic acceleration. The first phase is called inflation, which was proposed in 1980s to solve several conceptual puzzles of standard hot Big Bang cosmology [136][137][138] (see also [139][140][141]). This cosmic acceleration is suggested to occur about 10 −35 second after the Big Bang.…”

Section: Modified Gravity In Terms Of Torsion: the F (T ) Extensionmentioning

confidence: 99%

f(T) teleparallel gravity and cosmology

et al. 2016

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Over the past decades, the role of torsion in gravity has been extensively investigated along the main direction of bringing gravity closer to its gauge formulation and incorporating spin in a geometric description. Here we review various torsional constructions, from teleparallel, to Einstein-Cartan, and metric-affine gauge theories, resulting in extending torsional gravity in the paradigm of f (T ) gravity, where f (T ) is an arbitrary function of the torsion scalar. Based on this theory, we further review the corresponding cosmological and astrophysical applications. In particular, we study cosmological solutions arising from f (T ) gravity, both at the background and perturbation levels, in different eras along the cosmic expansion. The f (T ) gravity construction can provide a theoretical interpretation of the late-time universe acceleration, alternative to a cosmological constant, and it can easily accommodate with the regular thermal expanding history including the radiation and cold dark matter dominated phases. Furthermore, if one traces back to very early times, for a certain class of f (T ) models, a sufficiently long period of inflation can be achieved and hence can be investigated by cosmic microwave background observations, or alternatively, the Big Bang singularity can be avoided at even earlier moments due to the appearance of non-singular bounces. Various observational constraints, especially the bounds coming from the large-scale structure data in the case of f (T ) cosmology, as well as the behavior of gravitational waves, are described in detail. Moreover, the spherically symmetric and black hole solutions of the theory are reviewed. Additionally, we discuss various extensions of the f (T ) paradigm. Finally, we consider the relation with other modified gravitational theories, such as those based on curvature, like f (R) gravity, trying to enlighten the subject of which formulation, or combination of formulations, might be more suitable for quantization ventures and cosmological applications. Contents

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Section: Modified Gravity In Terms Of Torsion: the F (T ) Extensionmentioning

confidence: 99%

f(T) teleparallel gravity and cosmology

et al. 2016

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“…Fang in his pre-inflation inflation paper in 1980 [7]. Later in the 80s, the suggestion was made by Moss [8] and Yokoyama and Maeda [9] to introduce an Υφ term in the inflaton evolution equation, as a source of radiation production.…”

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confidence: 99%

Warm Inflation Model Building

Bastero-Gil

Berera

2009

Int. J. Mod. Phys. A

176

259

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We review the main aspects of the warm inflation scenario, focusing on the inflationary dynamics and the predictions related to the primordial spectrum of perturbations, to be compared with the recent cosmological observations. We study in detail three different classes of inflationary models, chaotic, hybrid models and hilltop models, and discuss their embedding into supersymmetric models and the consequences for model building of the warm inflationary dynamics based on first principles calculations. Due to the extra friction term introduced in the inflaton background evolution generated by the dissipative dynamics, inflation can take place generically for smaller values of the field, and larger values of couplings and masses. When the dissipative dynamics dominates over the expansion, in the so-called strong dissipative regime, inflation proceeds with sub-planckian inflaton values. Models can be naturally embedded into a supergravity framework, with sugra corrections suppressed by the Planck mass now under control, for a larger class of Kähler potentials. In particular, this provides a simpler solution to the "eta" problem in supersymmetric hybrid inflation, without restricting the Kähler potentials compatible with inflation. For chaotic models dissipation leads to a smaller prediction for the tensor-to-scalar ratio and a less tilted spectrum when compared to the cold inflation scenario. We find in particular that a small component of dissipation renders the quartic model now consistent with the current CMB data.

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“…Fang in 1980 [5]. His paper proposed using a scalar field with the origin of inflationary expansion due to a claimed anomalous dissipation term that would be generated based on Landau theory if the field was undergoing a second order phase transition.…”

Section: Introductionmentioning

confidence: 99%

Warm inflation and its microphysical basis

2009

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The microscopic quantum field theory origins of warm inflation dynamics are reviewed. The warm inflation scenario is first described along with its results, predictions and comparison with the standard cold inflation scenario. The basics of thermal field theory required in the study of warm inflation are discussed. Quantum field theory real time calculations at finite temperature are then presented and the derivation of dissipation and stochastic fluctuations are shown from a general perspective. Specific results are given of dissipation coefficients for a variety of quantum field theory interaction structures relevant to warm inflation, in a form that can readily be used by model builders. Different particle physics models realising warm inflation are presented along with their observational predictions.

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Entropy generation in the early universe by dissipative processes near the Higgs phase transition

Cited by 77 publications

References 8 publications

f(T) teleparallel gravity and cosmology

f(T) teleparallel gravity and cosmology

Warm Inflation Model Building

Warm inflation and its microphysical basis

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