2002/03/31 by Rouzbeh Allahverdi, Anupam Mazumdar, A. Özpineci +1 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #astro-ph #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.65.125003
published as Phys.Rev. D65 (2002) 125003 · 7 revtex pages, few references corrected and added, final version to appear in Phys. Rev. D
arxiv created 2002/05/22 · openalex publication_date 2002/05/24 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We discuss some interesting aspects of Q-ball formation during the early oscillations of the flat directions. These oscillations are triggered by the running of a soft (mass)2 stemming from the nonzero energy density of the Universe. However, this is quite different from standard Q-ball formation. The running in the presence of gauge and Yukawa couplings becomes strong if m1/2/m0 is sufficiently large. Moreover, Q balls which are formed during the early oscillations constantly evolve, due to the redshift of the Hubble-induced soft mass, until the low-energy supersymmtery breaking becomes dominant. For smaller m1/2/m0, Q balls are not formed during early oscillations because of the shrinking of the instability band due to the Hubble expansion. In this case, Q balls are formed only at the weak scale, but typically carry smaller charges, as a result of their amplitude redshift. Therefore, the Hubble-induced corrections to the flat directions give rise to a successful Q-ball cosmology.