warm inflation
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2021 ◽  
Vol 104 (12) ◽  
Author(s):  
Abolhassan Mohammadi
Keyword(s):  

2021 ◽  
pp. 100938
Author(s):  
Akash Bose ◽  
Subenoy Chakraborty
Keyword(s):  

2021 ◽  
Vol 2021 (12) ◽  
pp. 052
Author(s):  
Mar Bastero-Gil ◽  
Marta Subías Díaz-Blanco

Abstract In warm inflation, dissipation due to the interactions of the inflaton field to other light degrees of freedom leads naturally to the enhancement of the primordial spectrum during the last 10-20 efolds of inflation. We study this effect in a variant of the Warm Little Inflaton model, where the inflaton couples to light scalars, with a quartic chaotic potential. These large fluctuations on re-entry will form light, evaporating Primordial Black Holes, with masses lighter than 106 g. But at the same time they will act as a source for the tensors at second order. The enhancement is maximal near the end of inflation, which result in a spectral density of Gravitational Waves (GW) peaked at frequencies f ∼ O(105-106) Hz today, and with an amplitude ΩGW ∼ 10-9. Although the frequency range is outside the reach of present and planned GW detectors, it might be reached in future high-frequency gravitational waves detectors, designed to search for cosmological stochastic GW backgrounds above MHz frequencies.


2021 ◽  
Vol 2021 (12) ◽  
Author(s):  
Miguel Levy ◽  
João G. Rosa ◽  
Luís B. Ventura

Abstract We show that warm inflation can be realized within a minimal extension of the Standard Model with three right-handed neutrinos, three complex scalars and a gauged lepton/B-L U(1) symmetry. This simple model can address all the shortcomings of the Standard Model that are not related to fine-tuning, within general relativity, with distinctive experimental signatures that can be probed in the near future. The inflaton field emerges from the collective breaking of the U(1) symmetry, and interacts with two of the right-handed neutrinos, sustaining a high-temperature radiation bath during inflation. The discrete interchange symmetry of the model protects the scalar potential against large thermal corrections and leads to a stable inflaton remnant at late times which can account for dark matter. Consistency of the model and agreement with Cosmic Microwave Background observations naturally yield light neutrino masses below 0.1 eV, while thermal leptogenesis occurs naturally after a smooth exit from inflation into the radiation era.


2021 ◽  
Vol 104 (10) ◽  
Author(s):  
Xiao-Min Zhang ◽  
Kai Li ◽  
Yi-Fu Guo ◽  
Peng-Cheng Chu ◽  
He Liu ◽  
...  

2021 ◽  
Vol 104 (8) ◽  
Author(s):  
Yue Qiu ◽  
Lorenzo Sorbo

Author(s):  
M. R. Setare ◽  
A. Ravanpak ◽  
K. Bahari ◽  
G. F. Fadakar

In this paper, we study a constant-roll inflationary model in the context of brane-world cosmology caused by a quintessence scalar field for warm inflation with a constant dissipative parameter [Formula: see text]. We determine the analytical solution for the Friedmann equation coupled to the equation of motion of the scalar field. The evolution of the primordial scalar and tensor perturbations is also studied using the modified Langevin equation. To check the viability of the model, we use numerical approaches and plot some figures. Our results for the scalar spectral index and the tensor-to-scalar ratio show good consistency with observations.


2021 ◽  
Vol 104 (4) ◽  
Author(s):  
Meysam Motaharfar ◽  
Rudnei O. Ramos
Keyword(s):  

2021 ◽  
pp. 100865
Author(s):  
Sadaf Maqsood ◽  
Abdul Jawad ◽  
Nelson Videla

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