Novel collective excitations in a hot scalar field theory

Abstract

We study the spectrum of quasiparticles in a scalar quantum field theory at high temperature. Our results indicate the existence of novel quasiparticles with purely collective origin at low momenta for some choices of the masses and coupling. Scalar fields play a prominent role in many models of cosmology, and their collective excitations could be relevant for transport phenomena in the early universe.

In v1 there was an error in the self-energy, which is now corrected. This lead to some changes in the plots, but the basic results and conclusions remain unaffected

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Cited by in corpus (11)

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• Sterile neutrino Dark Matter production from scalar decay in a thermal bath
• What can the CMB tell about the microphysics of cosmic reheating?
• On finite density effects on cosmic reheating and moduli decay and implications for Dark Matter production
• Oscillating scalar dissipating in a medium
• Effective Action for Cosmological Scalar Fields at Finite Temperature
• Dissipation of oscillating scalar backgrounds in an FLRW universe
• General Markovian Equation for Scalar Fields in a Slowly Evolving Background
• Cosmological Particle Decays at Finite Temperature