Etherington duality breaking: gravitational lensing in non-metric space-times versus intrinsic alignments
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...
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| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
February 2023
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2023, Jahrgang: 518, Heft: 4, Pages: 5490-5499 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stac3445 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/stac3445
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| Verfasserangaben: | Eileen Sophie Giesel, Basundhara Ghosh and Björn Malte Schäfer |
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| 245 | 1 | 0 | |a Etherington duality breaking |b gravitational lensing in non-metric space-times versus intrinsic alignments |c Eileen Sophie Giesel, Basundhara Ghosh and Björn Malte Schäfer |
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| 520 | |a 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 space-time 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: First, for intrinsic size fluctuations and the resulting changes in surface brightness, and secondly, for an area-metric space-time as an example of a non-metric space-time, 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 Σ(ℓ) ≥ 3 in a Euclid-like survey. The measurement in area-metric space-times, 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 space-times, the measurement does not seem to be possible for natural values of the Etherington-breaking parameters. | ||
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