3 papers
gr-qc2026
On phase-space singular surfaces in gravity
Dražen Glavan, David M. J. Vokrouhlický
We perform a Hamiltonian constraint analysis of metric gravity in the Jordan frame and show that the regular constraint classification degenerates on singular phase-space su…
gr-qc2026
On the Bondi accretion of a self-interacting complex scalar field
Dražen Glavan, Alexander Vikman, Tom Zlosnik
Scalar fields with a global U(1) symmetry often appear in cosmology and astrophysics. We study the spherically-symmetric, stationary accretion of such a classical field onto a Schw…
gr-qc2025
Measurements in stochastic gravity and thermal variance
Markus B. Fröb, Dražen Glavan, Paolo Meda
We analyze the thermal fluctuations of a free, conformally invariant, Maxwell quantum field (photon) interacting with a cosmological background spacetime, in the framework of quant…