Probing a scale dependent gravitational slip with galaxy strong lensing systems
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arXiv
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| Format: | Preprint |
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2023
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| author | Guerrini, Sacha Mörtsell, Edvard |
| author_facet | Guerrini, Sacha Mörtsell, Edvard |
| contents | Observations of galaxy-scale strong gravitational lensing systems enable unique tests of departures from general relativity at the kpc-Mpc scale. In this work, the gravitational slip parameter $γ_{\rm PN}$, measuring the amplitude of a hypothetical fifth force, is constrained using 130 elliptical galaxy lens systems. We implement a lens model with a power-law total mass density and a deprojected De Vaucouleurs luminosity density, favored over a power-law luminosity density. To break the degeneracy between the lens velocity anisotropy, $β$, and the gravitational slip, we introduce a new prior on the velocity anisotropy based on recent dynamical data. For a constant gravitational slip, we find $γ_{\rm PN}=0.90^{+0.18}_{-0.14}$ in agreement with general relativity at the 68\% confidence level. Introducing a Compton wavelength $λ_g$, effectively screening the fifth force at small and large scales, the best fit is obtained for $λ_g \sim 0.2$ Mpc and $γ_{\rm PN} = 0.77^{+0.25}_{-0.14}$. A local minimum is found at $λ_g \sim 100$ Mpc and $γ_{\rm PN}=0.56^{0.45}_{-0.35}$. We conclude that there is no evidence in the data for a significant departure from general relativity and that using accurate assumptions and having good constraints on the lens galaxy model is key to ensure reliable constraints on the gravitational slip. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_11915 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Probing a scale dependent gravitational slip with galaxy strong lensing systems Guerrini, Sacha Mörtsell, Edvard Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology Observations of galaxy-scale strong gravitational lensing systems enable unique tests of departures from general relativity at the kpc-Mpc scale. In this work, the gravitational slip parameter $γ_{\rm PN}$, measuring the amplitude of a hypothetical fifth force, is constrained using 130 elliptical galaxy lens systems. We implement a lens model with a power-law total mass density and a deprojected De Vaucouleurs luminosity density, favored over a power-law luminosity density. To break the degeneracy between the lens velocity anisotropy, $β$, and the gravitational slip, we introduce a new prior on the velocity anisotropy based on recent dynamical data. For a constant gravitational slip, we find $γ_{\rm PN}=0.90^{+0.18}_{-0.14}$ in agreement with general relativity at the 68\% confidence level. Introducing a Compton wavelength $λ_g$, effectively screening the fifth force at small and large scales, the best fit is obtained for $λ_g \sim 0.2$ Mpc and $γ_{\rm PN} = 0.77^{+0.25}_{-0.14}$. A local minimum is found at $λ_g \sim 100$ Mpc and $γ_{\rm PN}=0.56^{0.45}_{-0.35}$. We conclude that there is no evidence in the data for a significant departure from general relativity and that using accurate assumptions and having good constraints on the lens galaxy model is key to ensure reliable constraints on the gravitational slip. |
| title | Probing a scale dependent gravitational slip with galaxy strong lensing systems |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2309.11915 |