3 papers
gr-qc2026
A Topological Origin of Black Hole Mass
Sandipan Sengupta
We show that the notion of a black hole mass could be superceded by that of a topological charge in a spacetime without matter and curvature singularity. This feature emerges throu…
gr-qc2025
Cosmological Consequences of Varying Couplings in Gravity Action
Sandipan Sengupta
We develop a Lagrangian formulation for gravity with matter where the gravitational couplings are universally treated as being field-dependent. The solutions for FLRW geometries an…
gr-qc2025
Galactic Spacetime Solutions with a Varying Newton's Coupling
Rounak Chakraborty, Sandipan Sengupta
We find a new family of galactic metrics corresponding to flat rotation curves at the outer radii. These are vacuum solutions to a gravity theory where the Newton's coupling varies…