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Thermodynamics of warm axionic Abelian gauge inflation
Ist Teil von
Chinese physics B, 2023-10, Vol.32 (11), p.119801
Ort / Verlag
Chinese Physical Society and IOP Publishing Ltd
Erscheinungsjahr
2023
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Inflationary spectral index from the Langevin equation is calculated under the frame of warm inflationary scenario with inflaton interacting with
U
(1) gauge fields through the Chern–Simons coupling
∝
ϕ
F
μ
ν
F
∼
μ
ν
/
f
. Under the strong dissipative condition, the spectral index is calculated in terms of the ratio of Hubble parameter to temperature
H
/
T
. Then relation between
H
/
T
and other cosmic parameters is analytically expressed, based on which a spectral index related to the Chern–Simons coupling strength is further obtained. Numerical results show that cosmic temperature
T
closes to a constant during inflation and decreases after inflation without a reheating process. Meanwhile, the ratio
H
/
T
tends to a constant if the gauged coupling constant is less than a threshold. This phenomenon shows that cosmic temperature may be an important physical parameter with a special value and adiabatic approximation still holds. We obtain the estimate
H
/
T
≤ 0.3377 during inflation from Planck data and other constraint conditions.