Protogalactic Extension of the Parker Bound

Details Protogalactic Extension of the Parker Bound Protogalactic Extension of the Parker Bound

1999-11-05

arxiv.org/abs/astro-ph/9911095v1

Phys.Rev. D62 (2000) 025002

Astronomy and Astrophysics

Astrophysics

9 pages, 1 eps figure

Scientific paper

10.1103/PhysRevD.62.025002

We extend the Parker bound on the galactic flux $\cal F$ 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 $\leq 10^{-9}$G demand that ${\cal F} \leq 5 \times 10^{-21} (m/10^{17} {GeV}) {cm}^{-2} {sec}^{-1} {sr}^{-1}$. 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 ($\Omega_m <1$), the maximum flux allowed is now $8 \times 10^{-19}$ cm^{-2} s^{-1} sr^{-1}, a factor of 150 lower than the maximum flux allowed by the extended Parker bound.

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