2004/09/21 by Kazuharu Bamba, J. Yokoyama, Jun’ichi Yokoyama
Physics and Astronomy · #Adiabatic process #Black Holes and Theoretical Physics #Classical mechanics #Cosmology and Gravitation Theories #Dilaton #Dynamo #Inflation (cosmology) #Inflaton #Magnetic field #Mathematical physics #Noncommutative and Quantum Gravity Theories #Noncommutative geometry #Physics #Quantum mechanics #Spacetime #Theoretical physics #astro-ph #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.70.083508
published as Phys.Rev. D70 (2004) 083508 · 16 pages, no figure
arxiv created 2004/09/21 · openalex publication_date 2004/10/06 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The 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.