Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-23
Phys.Rev.Lett.101:171302,2008
Astronomy and Astrophysics
Astrophysics
4 pages, 1 figure. Added references, fixed typos
Scientific paper
10.1103/PhysRevLett.101.171302
Many models of baryogenesis rely on anomalous particle physics processes to give baryon number violation. By numerically evolving the electroweak equations on a lattice, we show that baryogenesis in these models creates helical cosmic magnetic fields. After a transitory period, electroweak dynamics is found to conserve the Chern-Simons number and the total electromagnetic helicity. We argue that baryogenesis could lead to magnetic fields of nano-Gauss strength today on astrophysical length scales. In addition to being astrophysically relevant, such helical magnetic fields can provide an independent probe of baryogenesis and CP violation in particle physics.
Achucarro Ana
Copi Craig J.
Ferrer Francesc
Vachaspati Tanmay
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