title: On astrophysical solutions in the constructive gravity program and cosmological tests for weakly birefringent spacetime
creator: Giesel, Eileen Sophie
subject: ddc-530
subject: 530 Physics
description: Via gravitational closure [Dü+18]; [Wol22]; [Due20]; [Wie18] could show, how gravitational  theories based on the matter content of spacetime can be systematically constructed. While  this successfully reproduces general relativity for metric spacetimes, finding a solution for the  simplest generalization of Maxwell electrodynamics with a vacuum birefringence allowing,  area-metric structure has in general not been possible so far. For highly symmetric FLRW  spacetimes a metric, as well as an area-metric solution could be derived [Due20]; [Fis17].  Based on this result, the constructive gravity program will be applied for spherically symmetric,  stationary metric spacetimes. Furthermore, an according ansatz is worked out for  area-metric geometries, and it is discussed which difficulties arise in finding a corresponding  solution. Furthermore, the Etherington-duality is violated in the case of weakly area-metric  gravitation [Sch+17]; [Ale20b]; [SW17], and this violation will be investigated with weak  gravitational lensing experiments. The observable is the surface brightness, which is, however,  heavily influenced by astrophysical processes like physical interaction of galaxies with tidal  fields. Beyond that, it is studied how galaxies also get bent due to tidal interactions and how  strong this effect is compared to its analog in gravitational lensing.
date: 2023
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/32691/1/Dissertation_Giesel_Eileen.pdf
identifier: DOI:10.11588/heidok.00032691
identifier: urn:nbn:de:bsz:16-heidok-326914
identifier:   Giesel, Eileen Sophie  (2023) On astrophysical solutions in the constructive gravity program and cosmological tests for weakly birefringent spacetime.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/32691/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng