2005/02/28 by Kazuharu Bamba, J. Yokoyama, Jun’ichi Yokoyama +2 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Noncommutative and Quantum Gravity Theories #astro-ph #hep-ph #hep-th
paper · pdf · doi:10.48550/arxiv.hep-ph/0502244
To be published in the proceedings of 22nd Texas Symposium on Relativistic Astrophysics, Stanford University, December 2004, (1104) 6 pages, no figure
arxiv created 2005/02/28 · arxiv updated 2009/12/01
Generation of large-scale magnetic fields is studied in dilaton electromagnetism in noncommutative inflationary cosmology, taking into account the effects of the spacetime uncertainty principle motivated by string theory. We show that it is possible to generate large-scale magnetic fields with sufficient strength to account for the observed fields in galaxies and clusters of galaxies through only adiabatic compression without dynamo amplification mechanism in models of power-law inflation based on spacetime noncommutativity without introducing a huge hierarchy between the dilaton's potential and its coupling to the electromagnetic fields.