Torsion, Gravity Induced Chiral Symmetry Breaking and Cosmological Bounce
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866914698882973696 |
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| author | Tukhashvili, Giorgi |
| author_facet | Tukhashvili, Giorgi |
| contents | In this paper, we elaborate and extend our proposal arXiv:2307.16098 of the cosmological bouncing model in which a chiral condensate violates the null energy condition and induces a bounce. The condensate formation is caused by the gravitational effects that arise in the effective action when the curvature of space-time is non-zero. As the chiral condensation is a vacuum effect, the symmetries of the FRW space-time are not violated. We explicitly calculate the spinor effective action in the presence of a background gravitational field up to second order in curvature and with derivative corrections and also derive the initial conditions of the condensate. In addition, a new interaction term between the condensate and the scalar field is introduced that might be relevant for producing the adiabatic perturbations during the contraction phase. The curvature/energy density stays far from Planckian values throughout this evolution. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2309_08654 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Torsion, Gravity Induced Chiral Symmetry Breaking and Cosmological Bounce Tukhashvili, Giorgi General Relativity and Quantum Cosmology High Energy Physics - Theory In this paper, we elaborate and extend our proposal arXiv:2307.16098 of the cosmological bouncing model in which a chiral condensate violates the null energy condition and induces a bounce. The condensate formation is caused by the gravitational effects that arise in the effective action when the curvature of space-time is non-zero. As the chiral condensation is a vacuum effect, the symmetries of the FRW space-time are not violated. We explicitly calculate the spinor effective action in the presence of a background gravitational field up to second order in curvature and with derivative corrections and also derive the initial conditions of the condensate. In addition, a new interaction term between the condensate and the scalar field is introduced that might be relevant for producing the adiabatic perturbations during the contraction phase. The curvature/energy density stays far from Planckian values throughout this evolution. |
| title | Torsion, Gravity Induced Chiral Symmetry Breaking and Cosmological Bounce |
| topic | General Relativity and Quantum Cosmology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2309.08654 |