Warm DBI inflation with constant sound speed
Abstract We study inflation with the Dirac–Born–Infeld (DBI) noncanonical scalar field in both the cold and warm scenarios. We consider the Anti-de Sitter warp factor $$f(\phi )=f_{0}/\phi ^{4}$$ f(ϕ)=f0/ϕ4 for the DBI inflation and check viability of the quartic potential $$V(\phi )=\lambda \phi ^{...
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2019-01-01
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doaj-5ee9097dabbb437db5f4924ceff7e4c72020-11-25T00:29:22ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522019-01-0179111610.1140/epjc/s10052-019-6578-xWarm DBI inflation with constant sound speedS. Rasouli0K. Rezazadeh1A. Abdolmaleki2K. Karami3Department of Physics, University of KurdistanDepartment of Physics, University of KurdistanResearch Institute for Astronomy and Astrophysics of Maragha (RIAAM)Department of Physics, University of KurdistanAbstract We study inflation with the Dirac–Born–Infeld (DBI) noncanonical scalar field in both the cold and warm scenarios. We consider the Anti-de Sitter warp factor $$f(\phi )=f_{0}/\phi ^{4}$$ f(ϕ)=f0/ϕ4 for the DBI inflation and check viability of the quartic potential $$V(\phi )=\lambda \phi ^{4}/4$$ V(ϕ)=λϕ4/4 in light of the Planck 2015 observational results. In the cold DBI setting, we find that the prediction of this potential in the $$r-n_s$$ r-ns plane is in conflict with Planck 2015 TT, TE, EE + low P data. This motivates us to focus on the warm DBI inflation with constant sound speed. We conclude that in contrary to the case of cold scenario, the $$r-n_s$$ r-ns result of warm DBI model can be compatible with the 68% CL constraints of Planck 2015 TT, TE, EE + low P data in the intermediate and high dissipation regimes, whereas it fails to be observationally viable in the weak dissipation regime. Also, the prediction of this model for the running of the scalar spectral index $$dn_s/d\ln k$$ dns/dlnk is in good agreement with the constraint of Planck 2015 TT, TE, EE + low P data. Finally, we show that the warm DBI inflation can provide a reasonable solution to the swampland conjecture that challenges the de Sitter limit in the standard inflation.http://link.springer.com/article/10.1140/epjc/s10052-019-6578-x |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
S. Rasouli K. Rezazadeh A. Abdolmaleki K. Karami |
spellingShingle |
S. Rasouli K. Rezazadeh A. Abdolmaleki K. Karami Warm DBI inflation with constant sound speed European Physical Journal C: Particles and Fields |
author_facet |
S. Rasouli K. Rezazadeh A. Abdolmaleki K. Karami |
author_sort |
S. Rasouli |
title |
Warm DBI inflation with constant sound speed |
title_short |
Warm DBI inflation with constant sound speed |
title_full |
Warm DBI inflation with constant sound speed |
title_fullStr |
Warm DBI inflation with constant sound speed |
title_full_unstemmed |
Warm DBI inflation with constant sound speed |
title_sort |
warm dbi inflation with constant sound speed |
publisher |
SpringerOpen |
series |
European Physical Journal C: Particles and Fields |
issn |
1434-6044 1434-6052 |
publishDate |
2019-01-01 |
description |
Abstract We study inflation with the Dirac–Born–Infeld (DBI) noncanonical scalar field in both the cold and warm scenarios. We consider the Anti-de Sitter warp factor $$f(\phi )=f_{0}/\phi ^{4}$$ f(ϕ)=f0/ϕ4 for the DBI inflation and check viability of the quartic potential $$V(\phi )=\lambda \phi ^{4}/4$$ V(ϕ)=λϕ4/4 in light of the Planck 2015 observational results. In the cold DBI setting, we find that the prediction of this potential in the $$r-n_s$$ r-ns plane is in conflict with Planck 2015 TT, TE, EE + low P data. This motivates us to focus on the warm DBI inflation with constant sound speed. We conclude that in contrary to the case of cold scenario, the $$r-n_s$$ r-ns result of warm DBI model can be compatible with the 68% CL constraints of Planck 2015 TT, TE, EE + low P data in the intermediate and high dissipation regimes, whereas it fails to be observationally viable in the weak dissipation regime. Also, the prediction of this model for the running of the scalar spectral index $$dn_s/d\ln k$$ dns/dlnk is in good agreement with the constraint of Planck 2015 TT, TE, EE + low P data. Finally, we show that the warm DBI inflation can provide a reasonable solution to the swampland conjecture that challenges the de Sitter limit in the standard inflation. |
url |
http://link.springer.com/article/10.1140/epjc/s10052-019-6578-x |
work_keys_str_mv |
AT srasouli warmdbiinflationwithconstantsoundspeed AT krezazadeh warmdbiinflationwithconstantsoundspeed AT aabdolmaleki warmdbiinflationwithconstantsoundspeed AT kkarami warmdbiinflationwithconstantsoundspeed |
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