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

Date

2002-06-15

Author

Allahverdi, Rouzbeh
Mazumdar, Anupam
Özpineci, Altuğ

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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.

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https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0037098351&origin=inward
https://hdl.handle.net/11511/106872

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Department of Physics, Article