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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…
physics.ins-det2025
First experimental results and optimization study of the portable neutron-gamma imager GN-Vision
Jorge Lerendegui-Marco, James Hallam, Gastón Cisterna +9
GN-Vision is a compact, dual-modality imaging device designed to simultaneously localize the spatial origin of -ray and slow neutron sources, with potential applications in nucl…