N=2 PNGB Quintessence Dark Energy
arXiv:2002.01756 · doi:10.1007/s40042-021-00235-7
Abstract
In this paper we show that a pseudo-Nambu-Goldstone boson (PNGB) quintessence of spontaneous symmetry breaking (SSB) is responsible for an epoch of the late time cosmic acceleration. We suggest that an N=2 PNGB quintessence with SSB can give rise to the fast-roll cosmic acceleration in evolution of the Universe. In the N=2 PNGB quintessence model, the standard slow-roll condition in which the absolute value of the tachyonic mass squared of this model is much less than the square of the Hubble constant , is broken down to the fast-roll condition, . However, it is shown that the fast-rolling associated with the N=2 PNGB quintessence of SSB can be led to the epoch of the late time cosmic acceleration. Indeed, in our PNGB model, this epoch can be quite long lasting since the mass of the N=2 PNGB quintessence field is extremely small as .
arXiv comment7 pages, 2 figures, minor revision, to be published in JKPS
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