First look at continuous spin gravity: Time delay signatures
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866910213411438592 |
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| author | Kundu, Shayarneel Schuster, Philip Toro, Natalia |
| author_facet | Kundu, Shayarneel Schuster, Philip Toro, Natalia |
| contents | We consider the possibility that gravity is mediated by "continuous spin" particles, i.e.~ massless particles whose invariant spin scale $ρ_g$ is non-zero. In this case, the primary helicity-2 modes of gravitational radiation on a Minkowski background mix with a tower of integer-helicity partner modes under boosts, with $ρ_g$ controlling the degree of mixing. We develop a formalism for coupling spinless matter to continuous spin gravity at linearized level. Using this formalism, we calculate the time-delay signatures induced by gravitational waves in an idealized laser interferometer detector. The fractional deviation from general relativity predictions is $O(ρ_g/ω)$ for gravitational wave frequencies $ω>ρ_g$, and the effects of waves with $ω\lesssim ρ_g$ are damped. The precision and low frequency ranges of gravitational wave detectors suggest potential sensitivity to spin scales at or below $\sim 10^{-14}$ eV at ground-based laser interferometers and $\sim 10^{-24}$ eV at pulsar timing arrays, motivating further analysis of observable signatures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_03817 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | First look at continuous spin gravity: Time delay signatures Kundu, Shayarneel Schuster, Philip Toro, Natalia General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory We consider the possibility that gravity is mediated by "continuous spin" particles, i.e.~ massless particles whose invariant spin scale $ρ_g$ is non-zero. In this case, the primary helicity-2 modes of gravitational radiation on a Minkowski background mix with a tower of integer-helicity partner modes under boosts, with $ρ_g$ controlling the degree of mixing. We develop a formalism for coupling spinless matter to continuous spin gravity at linearized level. Using this formalism, we calculate the time-delay signatures induced by gravitational waves in an idealized laser interferometer detector. The fractional deviation from general relativity predictions is $O(ρ_g/ω)$ for gravitational wave frequencies $ω>ρ_g$, and the effects of waves with $ω\lesssim ρ_g$ are damped. The precision and low frequency ranges of gravitational wave detectors suggest potential sensitivity to spin scales at or below $\sim 10^{-14}$ eV at ground-based laser interferometers and $\sim 10^{-24}$ eV at pulsar timing arrays, motivating further analysis of observable signatures. |
| title | First look at continuous spin gravity: Time delay signatures |
| topic | General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2503.03817 |