TY - JOUR
T1 - Superadiabatic basis in cosmological particle production
T2 - Application to preheating
AU - Yamada, Yusuke
N1 - Publisher Copyright:
© 2021 IOP Publishing Ltd and Sissa Medialab.
PY - 2021/9
Y1 - 2021/9
N2 - We discuss the adiabatic basis dependence of particle number in time-dependent backgrounds. In particular, we focus on preheating after inflation, and show that, for the optimal basis, the time dependence of the produced particle number can be well approximated by a simple connection formula, which can be obtained by analysing Stokes phenomenon in given backgrounds. As we show explicitly, the simple connection formula can describe various parameter regions such as narrow and broad resonance regime in a unified manner.
AB - We discuss the adiabatic basis dependence of particle number in time-dependent backgrounds. In particular, we focus on preheating after inflation, and show that, for the optimal basis, the time dependence of the produced particle number can be well approximated by a simple connection formula, which can be obtained by analysing Stokes phenomenon in given backgrounds. As we show explicitly, the simple connection formula can describe various parameter regions such as narrow and broad resonance regime in a unified manner.
KW - inflation
KW - particle physics - cosmology connection
KW - quantum field theory on curved space
UR - http://www.scopus.com/inward/record.url?scp=85115201624&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85115201624&partnerID=8YFLogxK
U2 - 10.1088/1475-7516/2021/09/009
DO - 10.1088/1475-7516/2021/09/009
M3 - Article
AN - SCOPUS:85115201624
SN - 1475-7516
VL - 2021
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
IS - 9
M1 - 009
ER -