3 papers
gr-qc2026
Teleocosmology and quantum post-selection
Paul C. W. Davies, João Magueijo
Although cosmic acceleration is well established, its physical origin remains contentious. Most explanations invoke either a non-zero vacuum energy, i.e. a cosmological constant, o…
gr-qc2026
Modified Friedmann equations and non-singular cosmologies in non-polynomial quasi-topological gravities
Johanna Borissova, João Magueijo
Quasi-topological theories of gravity are known to resolve black-hole singularities. We investigate whether the same mechanism can remove cosmological singularities. Focusing on no…
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…