$$\alpha $$-attractor from superconformal E-models in brane inflation
| Autor: | Waqas Ahmed, Yungui Gong, Mudassar Sabir, Yizhou Lu |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Physics and Astronomy (miscellaneous) Friedmann equations Scalar (mathematics) lcsh:Astrophysics Observable Astrophysics::Cosmology and Extragalactic Astrophysics Lambda General Relativity and Quantum Cosmology symbols.namesake Quadratic equation lcsh:QB460-466 Attractor symbols lcsh:QC770-798 lcsh:Nuclear and particle physics. Atomic energy. Radioactivity Planck Brane Engineering (miscellaneous) Mathematical physics |
| Zdroj: | European Physical Journal European Physical Journal C: Particles and Fields, Vol 80, Iss 1, Pp 1-7 (2020) |
| ISSN: | 1434-6052 1434-6044 |
| Popis: | In the large extra dimensional braneworld inflation, Friedmann equation is modified to include a quadratic term in energy density with an additional parameter $\lambda$ called brane tension in addition to the usual linear term. The high energy brane corrections modify the slow-roll parameters and affect the behaviour of inflation. We analyse the superconformal inflation for E-models and find that there exist $\alpha$-attractors in brane inflation. The predictions for the scalar spectral index $n_s$ and the tensor-to-scalar ratio $r$ are computed numerically, and approximate analytic formulas in the high energy limit have been given for the observable $n_s$ and $r$. The constraints on the model parameters are obtained by using Planck 2018 and BICEP2 observational data. Comment: 11 pages, 3 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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