TY - JOUR
T1 - Reheating in two-sector cosmology
AU - Adshead, Peter
AU - Ralegankar, Pranjal
AU - Shelton, Jessie
N1 - Publisher Copyright:
© 2019, The Author(s).
PY - 2019/8/1
Y1 - 2019/8/1
N2 - We analyze reheating scenarios where a hidden sector is populated during reheating along with the sector containing the Standard Model. We numerically solve the Boltzmann equations describing perturbative reheating of the two sectors, including the full dependence on quantum statistics, and study how quantum statistical effects during reheating as well as the non-equilibrium inflaton-mediated energy transfer between the two sectors affects the temperature evolution of the two radiation baths. We obtain new power laws describing the temperature evolution of fermions and bosons when quantum statistics are important during reheating. We show that inflaton-mediated scattering is generically most important at radiation temperatures T ∼ Mϕ/4, and build on this observation to obtain analytic estimates for the temperature asymmetry produced by asymmetric reheating. We find that for reheating temperatures Trh ≪ Mϕ/4, classical perturbative reheating provides an excellent approximation to the final temperature asymmetry, while for Trh ≫ Mϕ/4, inflaton-mediated scattering dominates the population of the colder sector and thus the final temperature asymmetry. We additionally present new techniques to calculate energy transfer rates between two relativistic species at different temperatures.
AB - We analyze reheating scenarios where a hidden sector is populated during reheating along with the sector containing the Standard Model. We numerically solve the Boltzmann equations describing perturbative reheating of the two sectors, including the full dependence on quantum statistics, and study how quantum statistical effects during reheating as well as the non-equilibrium inflaton-mediated energy transfer between the two sectors affects the temperature evolution of the two radiation baths. We obtain new power laws describing the temperature evolution of fermions and bosons when quantum statistics are important during reheating. We show that inflaton-mediated scattering is generically most important at radiation temperatures T ∼ Mϕ/4, and build on this observation to obtain analytic estimates for the temperature asymmetry produced by asymmetric reheating. We find that for reheating temperatures Trh ≪ Mϕ/4, classical perturbative reheating provides an excellent approximation to the final temperature asymmetry, while for Trh ≫ Mϕ/4, inflaton-mediated scattering dominates the population of the colder sector and thus the final temperature asymmetry. We additionally present new techniques to calculate energy transfer rates between two relativistic species at different temperatures.
KW - Cosmology of Theories beyond the SM
KW - Thermal Field Theory
UR - http://www.scopus.com/inward/record.url?scp=85071574158&partnerID=8YFLogxK
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U2 - 10.1007/JHEP08(2019)151
DO - 10.1007/JHEP08(2019)151
M3 - Article
AN - SCOPUS:85071574158
SN - 1126-6708
VL - 2019
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 8
M1 - 151
ER -