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gr-qc2025
How black hole mimickers and Shapiro-free lenses signal effective dark matter
Lirui Yang, Will Barker, Tobias Mistele +1
We report the existence of two exotic compact objects in the leading relativistic model of modified Newtonian dynamics, namely aether-scalar-tensor theory. This model is consistent…
gr-qc2025
The radial metric function does not identify null surfaces
Yi-Hsiung Hsu, Will Barker, Michael Hobson +1
We investigate the conditions under which a hypersurface becomes null through the use of coordinate transformations. We demonstrate that, in static spacetimes, the correct criterio…