Primordial Gravitational Waves From Black Hole Evaporation in Standard and Non-Standard Cosmologies

Understand

Gravitons radiated from light, evaporating black holes contribute to the stochastic background of gravitational waves.

• The spectrum of such emission depends on both the mass and the spin of the black holes, as well as on the redshifting that occurs between the black hole formation and today.
• This, in turn, depends on the expansion history of the universe, which is largely unknown and unconstrained at times prior to the synthesis of light elements.
• Here, we explore the features of the stochastic background of gravitational waves from black hole evaporation under a broad range of possible early cosmological histories.