Primordial Planets with an Admixture of Dark Matter Particles and Baryonic Matter
baryonic admixture; dark matter; DM; early universe; primordial planets
It has been suggested that primordial planets could have formed in the early universe and the missing baryons in the universe could be explained by primordial free-floating planets of solid hydrogen. Many such planets were recently discovered around the old and metal-poor stars, and such planets could have formed in early epochs. Another possibility for missing baryons in the universe could be that these baryons are admixed with DM particles inside the primordial planets. Here, we discuss the possibility of the admixture of baryons in the DM primordial planets discussed earlier. We consider gravitationally bound DM objects with the DM particles constituting them varying in mass from 20 to100 GeV. Different fractions of DM particles mixed with baryonic matter in forming the primordial planets are discussed. For the different mass range of DM particles forming DM planets, we have estimated the radius and density of these planets with different fractions of DM and baryonic particles. It is found that for heavier-mass DM particles with the admixture of certain fractions of baryonic particles, the mass of the planet increases and can reach or even substantially exceed Jupiter mass. The energy released during the process of merger of such primordial planets is discussed. The energy required for the tidal breakup of such an object in the vicinity of a black hole is also discussed. 2023 by the authors.
Multidisciplinary Digital Publishing Institute (MDPI)
All Open Access; Gold Open Access; Green Open Access
https://doi.org/10.3390/universe9090401 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85172133967&doi=10.3390%2funiverse9090401&partnerID=40&md5=9a03d139c2901ba7c4e7d9dcee8578e7
Kiren O.V., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India, Department of Physics, St Claret PU College, Bangalore, 560013, India; Kenath A., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Sivaram C., Indian Institute of Astrophysics, Bangalore, 560034, India