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Horizon feedback inflation
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DOI：10.1140/epjc/s10052-018-5830-0.png)
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摘要
En 中文
We consider the effect of the Gibbons-Hawking radiation on the inflaton in the situation where it is coupled to a large number of spectator fields. We argue that this will lead to two important effects - a thermal contribution to the potential and a gradual change in parameters in the Lagrangian which results from thermodynamic and energy conservation arguments. We present a scenario of hilltop inflation where the field starts trapped at the origin before slowly experiencing a phase transition during which the field extremely slowly moves towards its zero temperature expectation value. We show that it is possible to obtain enough e-folds of expansion as well as the correct spectrum of perturbations without hugely fine-tuned parameters in the potential (albeit with many spectator fields). We also comment on how initial conditions for inflation can arise naturally in this situation.
Keyword:
DECAYING VACUUM ENERGY
DEFLATIONARY COSMOLOGY
QUANTUM INSTABILITY
PARTICLE CREATION
SITTER SPACE
THERMODYNAMICS
GRAVITY
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期刊
IF:
4.8
论文数:
1.8W
被引数:
4.7W
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