A stellar evolution bound on radiative particle decays and the cosmic microwave background distortion

Details A stellar evolution bound on radiative particle decays and the cosmic microwave background distortion A stellar evolution bound on radiative particle decays and the cosmic microwave background distortion

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...336...61r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 336, Jan. 1, 1989, p. 61-68. Research supported by the University of Califo

Astronomy and Astrophysics

Astrophysics

27

Background Radiation, Cosmic Rays, Elementary Particles, Microwaves, Radioactive Decay, Stellar Evolution, Open Clusters, Plasma Decay, Solar Neutrinos, Stellar Mass

Scientific paper

The connection between particle decays in the early universe and plasmon decays in stars is examined. The primordial decay of type chi - chi(prime)-gamma is discussed, and the parameter range of interest to account for the distortion of the cosmic microwave background is determined. It is shown that the initial number density of chi's relative to photons depends on the chi electromagnetic interaction strength and thus on the chi radiative decay width. The energy loss rate of a nonrelativistic plasma from the process gamma(plasma) - nu(i)-antinu(j) is calculated and implemented together with the conventional process gamma(plasma) - nu(e)-antinu(e), into a stellar evolution code. The evolution of stars with mass 1.3 solar and metallicity z = 0.02 is followed for different values of the transition magnetic moment mu(ij) and the core mass at helium flash, the luminosity at helium flash, and the helium burning lifetime. A relationship between mu(ij) and the core mass at helium flash, the luminosity at helium flash, and the helium burning lifetime is established. A new bound on mu(ij) is set and generalized to find a very general bound on the properties of radiatively decaying particles.

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