Parametric resonance of entropy perturbations in massless preheating
2015 ◽
Vol 24
(11)
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pp. 1550082
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Keyword(s):
In this paper, we revisit the question of possible preheating of entropy modes in a two-field model with a massless inflaton coupled to a matter scalar field. Using a perturbative approximation to the covariant method we demonstrate that there is indeed a parametric instability of the entropy mode which then at second-order leads to exponential growth of the curvature fluctuation on super-Hubble scale. Back-reaction effects shut off the induced curvature fluctuations, but possibly not early enough to prevent phenomenological problems. This confirms previous results obtained using different methods and resolves a controversy in the literature.
2020 ◽
Vol 29
(11)
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pp. 2041016
Keyword(s):
2019 ◽
Vol 11
(04)
◽
pp. 1950034
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2018 ◽
Vol 27
(08)
◽
pp. 1850087
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Keyword(s):
2020 ◽
Vol 367
◽
pp. 112472
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Keyword(s):
2018 ◽
Vol 15
(02)
◽
pp. 1850027
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2005 ◽
Vol 2005
(01)
◽
pp. 011-011
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Keyword(s):