247 citations · 3.6k across the 88 of their papers we have counts for
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Consistent Thermal Resummation and Phase Transitions with 2PI Methods
Amitayus Banik, Kimmo Kainulainen
We apply the two-particle irreducible (2PI) formalism as a framework for a consistent thermal resummation in studies of cosmological phase transitions. Considering a model with two…
Tachyonic particle production: quantum 2PI formalism with momentum exchanging collisions
Kimmo Kainulainen, Sami Nurmi, Olli Väisänen
Oscillating spacetime curvature can drive particle production during reheating, whose accurate modeling requires the use of non-perturbative out-of-equilibrium methods. Tachyonic i…
Coherent collision integrals for neutrino transport equations
Kimmo Kainulainen, Harri Parkkinen
We present quantum kinetic equations for neutrinos and derive Feynman rules for computing scattering rates involving coherent states. Our rules encompass both flavour- and particle…
Systematic moment expansion for electroweak baryogenesis
Kimmo Kainulainen, Niyati Venkatesan
We present a systematic moment expansion for solving the semiclassical Boltzmann equations for electroweak baryogenesis. The expansion is developed in powers of adiabatic coordinat…
Tachyonic production of dark relics: classical lattice vs. quantum 2PI in Hartree truncation
Kimmo Kainulainen, Sami Nurmi, Olli Väisänen
We study the out-of-equilibrium production of non-minimally coupled self-interacting scalar dark matter during reheating using classical lattice simulations. The outcomes of the cl…
Quantum kinetic equations with flavor and particle-antiparticle coherences for neutrinos
Kimmo Kainulainen, Harri Parkkinen
We develop a formalism to model neutrino evolution encompassing both flavor and particle-antiparticle mixings and decohering collisions. Our results include a quantum kinetic equat…