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gr-qc2026
The Symbiosis of Vainshtein and Chameleon Screening
Sergi Sirera, Tessa Baker, Clare Burrage +2
We present the first study of coexisting Vainshtein and Chameleon screening in cosmic structures. Screening hides fifth forces locally, keeping modified gravity viable. Realistic d…
gr-qc2025
Bimodular Gravity: Vacuum Evolution with a Frame-Dependent Phantom Crossing
James Hallam, João Magueijo
Unimodular gravity recasts the cosmological constant as an integration constant, fixed by a constraint on the volume element rather than chosen in the action. We ask what becomes o…