Etherington duality breaking

• Verfasst von: Giesel, Eileen [VerfasserIn]
• Verfasst von: Ghosh, Basundhara [VerfasserIn]
• Verfasst von: Schäfer, Björn Malte [VerfasserIn]
• Titel: Etherington duality breaking
• Titelzusatz: gravitational lensing in non-metric space-times versus intrinsic alignments
• Verf.angabe: Eileen Sophie Giesel, Basundhara Ghosh and Björn Malte Schäfer
• E-Jahr: 2023
• Jahr: February 2023
• Umfang: 10 S.
• Fussnoten: Online veröffentlicht 2022 November 25 ; Gesehen am 27.03.2023
• Titel Quelle: Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
• Ort Quelle: Oxford : Oxford Univ. Press, 1827
• Jahr Quelle: 2023
• Band/Heft Quelle: 518(2023), 4 vom: Feb., Seite 5490-5499
• ISSN Quelle: 1365-2966
• DOI: doi:10.1093/mnras/stac3445
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1840124857

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 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.