Cosmological Gravitational Waves from Ultralight Vector Dark Matter
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866910163549552640 |
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| author | Chase, Tomás Ferreira Nacir, Diana López |
| author_facet | Chase, Tomás Ferreira Nacir, Diana López |
| contents | We compute the abundance of cosmological gravitational waves produced during the evolution of an ultralight vector (spin-1) dark matter field. A homogeneous background vector field breaks spatial isotropy, requiring a Bianchi I geometry and inducing a mixing between the scalar, vector, and tensor perturbation sectors. We derive the perturbation equations in this background and show that, as a consequence of this mixing, scalar perturbations act as a source of tensor modes, generating a stochastic GW background. The production and cosmological evolution of these gravitational waves are implemented in a modified version of CLASS, from which we obtain the present-day spectrum. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_21080 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Cosmological Gravitational Waves from Ultralight Vector Dark Matter Chase, Tomás Ferreira Nacir, Diana López Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology We compute the abundance of cosmological gravitational waves produced during the evolution of an ultralight vector (spin-1) dark matter field. A homogeneous background vector field breaks spatial isotropy, requiring a Bianchi I geometry and inducing a mixing between the scalar, vector, and tensor perturbation sectors. We derive the perturbation equations in this background and show that, as a consequence of this mixing, scalar perturbations act as a source of tensor modes, generating a stochastic GW background. The production and cosmological evolution of these gravitational waves are implemented in a modified version of CLASS, from which we obtain the present-day spectrum. |
| title | Cosmological Gravitational Waves from Ultralight Vector Dark Matter |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2604.21080 |