Home > Research > Publications & Outputs > Q-ball formation in the wake of Hubble-induced ...

Electronic data

  • PhysRevD

    Rights statement: © 2002 The American Physical Society

    Final published version, 80.1 KB, PDF document


Text available via DOI:

View graph of relations

Q-ball formation in the wake of Hubble-induced radiative corrections

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number125003
<mark>Journal publication date</mark>24/05/2002
<mark>Journal</mark>Physical Review D
Issue number12
Number of pages7
Publication StatusPublished
<mark>Original language</mark>English


We discuss some interesting aspects of the $\rm Q$-ball formation during the early oscillations of the flat directions. These oscillations are triggered by the running of soft $({\rm mass})^2$ stemming from the nonzero energy density of the Universe. However, this is quite different from the standard $\rm Q$-ball formation. The running in presence of gauge and Yukawa couplings becomes strong if $m_{1/2}/m_0$ is sufficiently large. Moreover, the $\rm Q$-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 $m_{1/2}/m_0$, $\rm Q$-balls are not formed during early oscillations because of the shrinking of the instability band due to the Hubble expansion. In this case the $\rm Q$-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 $\rm Q$-ball cosmology.

Bibliographic note

© 2002 The American Physical Society 7 revtex pages, few references corrected and added, final version to appear in Phys. Rev. D