Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-10-22
Phys.Rev.D51:2693-2702,1995
Physics
High Energy Physics
High Energy Physics - Phenomenology
Submitted to Physical Review {\rm D}: October 4, 1994 21 page, UM-AC 94-35
Scientific paper
10.1103/PhysRevD.51.2693
A semiclassical calculation of particle production by a scalar field in a potential is performed. We focus on the particular case of production of fermions by a Nambu-Goldstone boson $\theta$. We have derived a (non)local equation of motion for the $\theta$-field with the backreaction of the produced particles taken into account. The equation is solved in some special cases, namely for purely Nambu-Goldstone bosons and for the tilted potential $ U(\theta ) \propto m^2 \theta^2 $. Enhanced production of bosons due to parametric resonance is investigated; we argue that the resonance probably disappears when the expansion of the universe is included. Application of our work on particle production to reheating and an idea for baryogenesis in inflation are mentioned.
Dolgov Alexandre
Freese Katherine
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