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Sterile neutrino dark matter from generalized <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi><mml:mi>T</mml:mi></mml:math> -symmetric early-Universe cosmologies
We generalize gravitational particle production in a radiation-dominated $CPT$-symmetric universe to nonstandard but also $CPT$-symmetric early-Universe cosmologies. We calculate the mass of a right-handed ``sterile'' neutrino needed for it to be the cosmological dark matter. Since generically sterile neutrinos mix with the standard model active neutrinos, we use state-of-the-art tools …