Perturbation Dynamics and Structure Formation in Extended Proca-Nuevo Gravity
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866913058214903808 |
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| author | Kavya, N. S. De, Avik Loo, Tee-How |
| author_facet | Kavya, N. S. De, Avik Loo, Tee-How |
| contents | A comprehensive analysis of cosmological perturbations and structure formation is presented for the Extended Proca-Nuevo (EPN) framework, a vector-tensor extension of General Relativity with a massive spin-1 field. In this scenario, the vector field modifies the background expansion through an algebraic constraint, leading to a characteristic Hubble evolution that interpolates between $Λ$CDM limits while introducing deviations at intermediate redshifts. Assuming minimal matter coupling, the linear perturbation equations are derived in gauge-invariant form and the resulting growth of matter inhomogeneities is analyzed. The EPN sector induces effective anisotropic stress and couples a single propagating scalar mode to the metric potentials, leaving the matter growth equation in its GR form but with a modified expansion history. The full scalar perturbation system is presented, stability conditions are discussed, and the results provide a foundation for testing the EPN framework against current and future cosmological observations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_21962 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Perturbation Dynamics and Structure Formation in Extended Proca-Nuevo Gravity Kavya, N. S. De, Avik Loo, Tee-How General Relativity and Quantum Cosmology A comprehensive analysis of cosmological perturbations and structure formation is presented for the Extended Proca-Nuevo (EPN) framework, a vector-tensor extension of General Relativity with a massive spin-1 field. In this scenario, the vector field modifies the background expansion through an algebraic constraint, leading to a characteristic Hubble evolution that interpolates between $Λ$CDM limits while introducing deviations at intermediate redshifts. Assuming minimal matter coupling, the linear perturbation equations are derived in gauge-invariant form and the resulting growth of matter inhomogeneities is analyzed. The EPN sector induces effective anisotropic stress and couples a single propagating scalar mode to the metric potentials, leaving the matter growth equation in its GR form but with a modified expansion history. The full scalar perturbation system is presented, stability conditions are discussed, and the results provide a foundation for testing the EPN framework against current and future cosmological observations. |
| title | Perturbation Dynamics and Structure Formation in Extended Proca-Nuevo Gravity |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2604.21962 |