Nonminimally-coupled warm Higgs inflation: Metric vs. Palatini formulations

Thammarong Eadkhong (School of Science, Walailak University, Nakhon Si Thammarat, Thailand) ; Punsiri Dam-O (School of Science, Walailak University, Nakhon Si Thammarat, Thailand) ; Phongpichit Channuie (School of Science, Walailak University, Nakhon Si Thammarat, Thailand; College of Graduate Studies, Walailak University, Nakhon Si Thammarat, Thailand) ; Davood Momeni (Northern Virginia Community College, Annandale, United States of America)

In this work, we study the non-minimally-coupled Higgs model in the context of warm inflation scenario on both metric and Palatini approaches. We particularly consider a dissipation parameter of the form Γ=CTT with CT being a coupling parameter and focus only on the strong regime of the interaction between inflaton and radiation fluid. We compute all relevant cosmological parameters and constrain the models using the observational Planck 2018 data. We discover that the ns and r values are consistent with the observational bounds. Having used the observational data, we constrain a relation between ξ and λ for the non-minimally-coupled warm Higgs inflation in both metric and Palatini cases. To produce ns and r in agreement with observation, we find that their values are two orders of magnitude higher than those of the usual (cold) non-minimally-coupled Higgs inflation.

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      "surname": "Dam-O", 
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      "surname": "Momeni", 
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      "title": "Nonminimally-coupled warm Higgs inflation: Metric vs. Palatini formulations"
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      "value": "In this work, we study the non-minimally-coupled Higgs model in the context of warm inflation scenario on both metric and Palatini approaches. We particularly consider a dissipation parameter of the form <math><mi>\u0393</mi><mo>=</mo><msub><mrow><mi>C</mi></mrow><mrow><mi>T</mi></mrow></msub><mi>T</mi></math> with <math><msub><mrow><mi>C</mi></mrow><mrow><mi>T</mi></mrow></msub></math> being a coupling parameter and focus only on the strong regime of the interaction between inflaton and radiation fluid. We compute all relevant cosmological parameters and constrain the models using the observational Planck 2018 data. We discover that the <math><msub><mrow><mi>n</mi></mrow><mrow><mi>s</mi></mrow></msub></math> and r values are consistent with the observational bounds. Having used the observational data, we constrain a relation between \u03be and \u03bb for the non-minimally-coupled warm Higgs inflation in both metric and Palatini cases. To produce <math><msub><mrow><mi>n</mi></mrow><mrow><mi>s</mi></mrow></msub></math> and r in agreement with observation, we find that their values are two orders of magnitude higher than those of the usual (cold) non-minimally-coupled Higgs inflation."
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Published on:
13 July 2023
Publisher:
Elsevier
Published in:
Nuclear Physics B , Volume 994 C (2023)

Article ID: 116289
DOI:
https://doi.org/10.1016/j.nuclphysb.2023.116289
Copyrights:
The Author(s)
Licence:
CC-BY-3.0

Fulltext files: