Evolution of gravitational waves through cosmological transitions

The spectrum of gravitational waves that have been produced in inflation is modified during cosmological transitions. Large drops in the number of relativistic particles, like during the QCD transition or at

e^+e^-

annihilation, lead to steps in the spectrum of gravitational waves. We calculate the transfer function for the differential energy density of gravitational waves for a first-order and for a crossover QCD transition.

gravitational radiation: energy spectrum
inflation
particle: relativistic
quantum chromodynamics: transition
electron positron: annihilation
numerical calculations

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