Cosmological constraints on unstable particles: Numerical bounds and analytic approximations
Cosmological constraints on unstable particles: Numerical bounds and analytic approximations
Many extensions of the Standard Model predict large numbers of additional unstable particles whose decays in the early universe are tightly constrained by observational data. For example, the decays of such particles can alter the ratios of light-element abundances, give rise to distortions in the cosmic microwave background, alter the …