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| Main Authors: | , |
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| Format: | Preprint |
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2023
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| Online Access: | https://arxiv.org/abs/2306.01576 |
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| _version_ | 1866916081188208640 |
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| author | Pareek, Pooja Nautiyal, Akhilesh |
| author_facet | Pareek, Pooja Nautiyal, Akhilesh |
| contents | The large value of non-minimal coupling constant $ξ$ required to satisfy CMB observations in Higgs inflation violates unitarity. In this work we study Higgs-inflation with non-canonical kinetic term of DBI form to find whether $ξ$ can be reduced. To study the inflationary dynamics, we transform the action to the Einstein frame, in which the Higgs is minimally coupled to gravity with a non-canonical kinetic term and modified potential. We choose the Higgs self coupling constant $λ=0.14$ for our analysis. We find that the value of $ξ$ can be reduced from $10^{3}-10^{4}$ to $\mathcal{O}(10)$ to satisfy Planck constraints on amplitude of scalar power spectrum. However, this model produces a larger tensor-to-scalar ratio $r$, in comparison to the Higgs inflation with canonical kinetic term. We also find that, to satisfy joint constraints on scalar spectral index $n_s$ and tensor-to-scalar ratio $r$ from Planck-2018 and bounds on $r$ from Planck and BICEP3, the value of $ξ$ should be of the order of $10^4$. Thus, the issue of unitarity violation remains even after considering Higgs inflation with non-canonical kinetic term |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_01576 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Non-canonical Higgs inflation Pareek, Pooja Nautiyal, Akhilesh Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory The large value of non-minimal coupling constant $ξ$ required to satisfy CMB observations in Higgs inflation violates unitarity. In this work we study Higgs-inflation with non-canonical kinetic term of DBI form to find whether $ξ$ can be reduced. To study the inflationary dynamics, we transform the action to the Einstein frame, in which the Higgs is minimally coupled to gravity with a non-canonical kinetic term and modified potential. We choose the Higgs self coupling constant $λ=0.14$ for our analysis. We find that the value of $ξ$ can be reduced from $10^{3}-10^{4}$ to $\mathcal{O}(10)$ to satisfy Planck constraints on amplitude of scalar power spectrum. However, this model produces a larger tensor-to-scalar ratio $r$, in comparison to the Higgs inflation with canonical kinetic term. We also find that, to satisfy joint constraints on scalar spectral index $n_s$ and tensor-to-scalar ratio $r$ from Planck-2018 and bounds on $r$ from Planck and BICEP3, the value of $ξ$ should be of the order of $10^4$. Thus, the issue of unitarity violation remains even after considering Higgs inflation with non-canonical kinetic term |
| title | Non-canonical Higgs inflation |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2306.01576 |