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gr-qc2026
Disformal Maps: Classification and Singular Dynamics
Mohammad Ali Gorji, Pavel Jiroušek, Alexander Vikman +1
Being agnostic about the field content of a gravitational system, we consider a general disformal transformation of the metric, , on a four-dimensional Lore…
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★ 6 cited
Causality and Stability from Acoustic Geometry
Ignacy Sawicki, Georg Trenkler, Alexander Vikman
In scalar-tensor theories with derivative interactions, backgrounds spontaneously break local Lorentz invariance. We study the motion of perturbations of the scalar, "phonons", on…