Protogalactic extension of the Parker bound

Journal Article · Sat Jul 15 04:00:00 EDT 2000 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.62.025002· OSTI ID:20217152

Lewis, M J ^[1]; Freese, Katherine ^[1]; Tarle, Gregory ^[1]

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1. Randall Physics Laboratory, University of Michigan, Ann Arbor, Michigan 48109-1120 (United States)

We extend the Parker bound on the galactic flux F of magnetic monopoles. By requiring that a small initial seed field must survive the collapse of the protogalaxy, before any regenerative dynamo effects become significant, we develop a stronger bound. The survival and continued growth of an initial galactic seed field {<=}10{sup -9} G demand that F{<=}5x10{sup -21}(m/10{sup 17} GeV)cm{sup -2} sec{sup -1} sr{sup -1}. For a given monopole mass, this bound is four and a half orders of magnitude more stringent than the previous ''extended Parker bound,'' but is more speculative as it depends on assumptions about the behavior of magnetic fields during protogalactic collapse. For monopoles which do not overclose the universe ({omega}{sub m}<1), the maximum flux allowed is now 8x10{sup -19} cm{sup -2} s{sup -1} sr{sup -1}, a factor of 150 lower than the maximum flux allowed by the extended Parker bound. (c) 2000 The American Physical Society.

• OSTI ID: 20217152
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 2 Vol. 62; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMOLOGICAL MODELS
GALACTIC EVOLUTION
GRAND UNIFIED THEORY
LIMITING VALUES
MAGNETIC MONOPOLES
THEORETICAL DATA