Etherington duality breaking: gravitational lensing in non-metric spacetimes versus intrinsic alignments
arXiv:2208.07197 · doi:10.1093/mnras/stac3445
Abstract
The Etherington distance duality relation is well-established for metric theories of gravity, and confirms the duality between the luminosity distance and the angular diameter distance through the conservation of surface brightness. A violation of the Etherington distance duality due to lensing in a non-metric spacetime would lead to fluctuations in surface brightness of galaxies. Likewise, fluctuations of the surface brightness can arise in classical astrophysics as a consequence of intrinsic tidal interaction of galaxies with their environment. Therefore, we study these in two cases in detail: Firstly, for intrinsic size fluctuations and the resulting changes in surface brightness, and secondly, for an area-metric spacetime as an example of a non-metric spacetime where the distance duality relation itself acquires modifications. The aim of this work is to quantify whether a surface brightness fluctuation effect due to area-metric gravity would be resolvable compared to the similar effect caused by intrinsic alignment. We thus compare the auto- and cross-correlations of the angular spectra in these two cases and show that the fluctuations in intrinsic brightness can potentially be measured with a cumulative signal-to-noise ratio in a Euclid-like survey. The measurement in area-metric spacetimes, however, depends on the specific parameter choices, which also determine the shape and amplitude of the spectra. While lensing surveys do have sensitivity to lensing-induced surface brightness fluctuations in area-metric spacetimes, the measurement does not seem to be possible for natural values of the Etherington-breaking parameters.
arXiv comment12 pages, 6 figures, submitted to MNRAS
References in corpus (31)
- Modified Gravity and Cosmology
- Stable clustering, the halo model and nonlinear cosmological power spectra
- Karhunen-Loeve eigenvalue problems in cosmology: how should we tackle large data sets?
- A concise reference to (projected) Sersic R^{1/n} quantities, including Concentration, Profile Slopes, Petrosian indices, and Kron Magnitudes
- Intrinsic galaxy alignments from the 2SLAQ and SDSS surveys: luminosity and redshift scalings and implications for weak lensing surveys
- Galaxy alignments: An overview
- The Intrinsic Alignment of Galaxies and its Impact on Weak Gravitational Lensing in an Era of Precision Cosmology
- Cosmic distance-duality as probe of exotic physics and acceleration
- Galaxy alignments: Observations and impact on cosmology
- Galaxy-galaxy weak lensing in SDSS: intrinsic alignments and shear calibration errors
- Weak Lensing: Prospects for Measuring Cosmological Parameters
- Galaxy alignments: Theory, modelling and simulations
- Fresnel analysis of the wave propagation in nonlinear electrodynamics
- Intrinsic Alignments of Galaxies in the Illustris Simulation
- Geometry of physical dispersion relations
- The mass dependence of dark matter halo alignments with large-scale structure
- Propagation of light in area metric backgrounds
- Tidal alignments as a contaminant of the galaxy bispectrum
- Angular ellipticity correlations in a composite alignment model for elliptical and spiral galaxies and inference from weak lensing
- Gravitational dynamics for all tensorial spacetimes carrying predictive, interpretable and quantizable matter
- Quantization of general linear electrodynamics
- Intrinsic and extrinsic correlations of galaxy shapes and sizes in weak lensing data
- Testing gravity with the Milky Way: Yukawa potential
- Gravitational closure of matter field equations
- Distance-duality in theories with a nonminimal coupling to gravity
- Modifications to the Etherington Distance Duality Relation and Observational Limits
- A Framework for Measuring Weak-Lensing Magnification Using the Fundamental Plane
- Dynamics of the Tidal Fields and Formation of Star Clusters in Galaxy Mergers
- Gravitational radiation from birefringent matter dynamics
- Symmetric gravitational closure
- Solutions of gravitational field equations for weakly birefringent spacetimes