Production of purely gravitational dark matter: the case of fermion and vector boson

Abstract

We consider the simplest possibility for a model of particle dark matter in which dark matter has only gravitational interaction with the standard model sector. Even in such a case, it is known that the gravitational particle production in an expanding universe may lead to a correct relic abundance depending on the inflation scale and the mass of dark matter particle. We provide a comprehensive and systematic analysis of the gravitational particle production of fermionic and vectorial dark matter, and emphasize that particles which are much heavier than the Hubble parameter but lighter than inflaton can also be produced abundantly.

Misalignment & Co.: (pseudo-)scalar and vector dark matter with curvature couplings

“…Given the correspondence between transverse vector fluctuations and scalar ones, it is expected that the energy density stored in small scale fluctuations can also be important here. In addition to that and as a particularity of the vector case, the authors of [42] (see [72] as well) showed that longitudinal vector fluctuations can be copiously produced during inflation also for κ = 0.…”

Deciphering the archaeological record: Cosmological imprints of nonminimal dark sectors

“…Furthermore, as shown in Refs. [38][39][40][41][42][43][44][45], oscillations of background quantities induced by inflaton dynamics can also contribute to particle production in the early universe.…”

Completely dark photons from gravitational particle production during the inflationary era

“…[29][30][31][32][33][34][35][36][37][38], spin-1/2 particles by refs. [39][40][41], spin-1 particles by refs. [40,[42][43][44], and spin-3/2 particles by refs.…”

“…[39][40][41], spin-1 particles by refs. [40,[42][43][44], and spin-3/2 particles by refs. [31,45,46].…”