Abstract
The variation of cosmic baryon number generation with grand unification energy is investigated in a variety of cosmological models. We show that ‘low’ energy unification schemes of the Pati-Salam type will not generate a significant cosmological baryon number in cosmological models consistent with observation. We also evaluate the baryon production by primordial black holes with delta function and power-law number density spectra. A sufficiently steep black hole number spectrun allows ‘low’ energy unification schemes to explain the observed baryon content of the universe and also be in accord with other astronomical limits. The production of stable magnetic monopoles by the Hawking effect is also calculated. In conjunction with observations of the Universe's deceleration this enables the black hole production to be excluded when the unification scale is ‘low’. It also enables very strong limits to be placed on the possible abundance of primordial black holes.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
