Baryon isocurvature fluctuations at small scales and baryonic dark matter

Journal Article · Sat May 15 00:00:00 EDT 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.47.4244· OSTI ID:6875891

Dolgov, A ^[1]; Silk, J ^[2]

---

1. Center for Particle Astrophysics, University of California, Berkeley, California 94720 (United States) Institute of Theoretical and Experimental Physics, Moscow (Russian Federation)
2. Center for Particle Astrophysics and Departments of Astronomy and Physics, University of California, Berkeley, California 94720 (United States)

A model of baryogenesis is described which gives rise to fluctuations in baryon number that are large on small scales but of low amplitude on large scales. This provides a mechanism for primordial black-hole formation, and allows the possibility of a critical density of dark matter in baryonic (and antibaryonic) form. Since high-density regions naturally possess both signs of baryonic excess, our model also predicts a small fraction of the mass density of the Universe to be in the form of compact antibaryonic regions. These objects may be observable via a redshifted annihilation feature in the diffuse extragalactic [gamma]-ray background, as both steady sources of [gamma]-ray radiation and annihilation-powered [gamma]-ray bursters at cosmological distances, by a distortion of the spectrum of the 3K background radiation, or by the presence of antihelium nuclei as a rare component of high-energy cosmic rays.

• OSTI ID: 6875891
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 47:10; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
NONLUMINOUS MATTER
FLUCTUATIONS
UNIVERSE
BACKGROUND RADIATION
BLACK HOLES
C INVARIANCE
PHASE TRANSFORMATIONS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INVARIANCE PRINCIPLES
MATTER
RADIATIONS
VARIATIONS
662390* - Electromagnetic Processes & Properties- (1992-)