Gravitational leptogenesis in natural inflation
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2017/12/007
Abstract: We compute the gravitational leptogenesis generated from the parity-violating gravitational waves sourced by an abelian gauge field coupled to a pseudo-scalar inflation. We show that, once the CMB bound on the tensor-to-scalar ratio is enforced,… read more here.
Keywords: cosmology; leptogenesis natural; gravitational leptogenesis; inflation ... See more keywords
Chromo-natural inflation supported by enhanced friction from Horndeski gravity
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2024/10/044
Abstract: We study the extension of the chromo-natural inflation model by incorporating nonminimal coupling between the axion field and gravity. Nonminimal coupling is introduced so that it enhances friction in the axion's equation of motion and… read more here.
Keywords: inflation; gravity; natural inflation; chromo natural ... See more keywords
Natural inflation with exponentially small tensor-to-scalar ratio
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DOI: 10.1103/physrevd.110.l061302
Abstract: We demonstrate that"natural inflation", also known as"axion inflation", can be compatible with Planck 2018 measurements of the cosmic microwave background, while predicting an exponentially small tensor-to-scalar ratio, e.g., $r\sim 10^{-15}$. The strong suppression of $r$… read more here.
Keywords: scalar ratio; inflation; natural inflation; tensor scalar ... See more keywords
Strong dynamics and natural inflation
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.98.083504
Abstract: We continue our investigation of the 4d effective field theory for closed string axions in Type II compactifications with D-branes. The inclusion of St\"uckelberg couplings for the axions requires the presence of chiral fermions at… read more here.
Keywords: dynamics natural; natural inflation; inflation; strong dynamics ... See more keywords