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gr-qc2026
Covariant variation for point-particle Lagrangians
Finnian Gray, Sebastian Murk, Daniel R. Terno
Structureless test particles in general relativity follow geodesics. For extended bodies, higher-order multipole moments lead to departures from geodesic motion; in particular, spi…
gr-qc2026
Apparent horizon as a membrane
Daniel R. Terno
The requirement that a trapped spacetime domain forms in finite time for distant observers is logically possible and sometimes unavoidable, but its consequences are not yet fully u…
quant-ph2026
Classical-quantum gravity as quantum gravity in disguise
Masahiro Hotta, Sebastian Murk, Daniel R. Terno
Whether gravity must be quantized remains one of the biggest open problems in fundamental physics. Classical-quantum hybrid theories have recently attracted attention as a possible…