# Boltzmann or Bogoliubov? Approaches Compared in Gravitational Particle Production

@inproceedings{Kaneta2022BoltzmannOB, title={Boltzmann or Bogoliubov? Approaches Compared in Gravitational Particle Production}, author={Kunio Kaneta and Sung Mook Lee and Kin-ya Oda}, year={2022} }

Gravitational particle production is a minimal contribution to reheating the Universe after the end of inflation. To study this production channel, two different approaches have commonly been considered, one of which is based on the Boltzmann equation, and the other is based on the Bogoliubov transformation. Each of these has pros and cons in practice. The collision term in the Boltzmann equation can be computed based on quantum field theory in the Minkowski spacetime, and thus many techniques…

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