28 citations · 214 across the 21 of their papers we have counts for
18 papers · 1 filter
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…
Thermodynamics of Regular Black Holes in Anti-de Sitter Space
Robie A. Hennigar, David Kubizňák, Sebastian Murk +1
We construct regular black holes with anti-de Sitter asymptotics in theories incorporating infinite towers of higher-order curvature corrections in any dimension . We find…
Gravity-induced birefringence in spherically symmetric spacetimes
Sebastian Murk, Daniel R. Terno, Rama Vadapalli
Geometric optics effectively describes the propagation of electromagnetic waves when the wavelength is much smaller than the characteristic length scale of the medium, making wave…
Light rings and causality for nonsingular ultracompact objects sourced by nonlinear electrodynamics
Sebastian Murk, Ioannis Soranidis
We study observational signatures of nonsingular ultracompact objects regularized by nonlinear electrodynamics. The phenomenon of birefringence causes photons of different polariza…
Categorical Quantum Volume Operator
Alexander Hahn, Sebastian Murk, Sukhbinder Singh +1
We present a generalization of the quantum volume operator quantifying the volume in curved three-dimensional discrete geometries. In its standard form, the quantum volume operator…
Kinematic and energy properties of dynamical regular black holes
Sebastian Murk, Ioannis Soranidis
Nonsingular black holes have received much attention in recent years as they provide an opportunity to avoid the singularities inherent to the mathematical black holes predicted by…
Regular black holes and the first law of black hole mechanics
Sebastian Murk, Ioannis Soranidis
Singularity-free regular black holes are a popular alternative to the singular mathematical black holes predicted by general relativity. Here, we derive a generic condition that sp…
Nomen non est omen: Why it is too soon to identify ultra-compact objects as black holes
Sebastian Murk
Black holes play a pivotal role in the foundations of physics, but there is an alarming discrepancy between what is considered to be a black hole in observational astronomy and the…
Black holes and their horizons in semiclassical and modified theories of gravity
Robert B. Mann, Sebastian Murk, Daniel R. Terno
For distant observers black holes are trapped spacetime domains bounded by apparent horizons. We review properties of the near-horizon geometry emphasizing the consequences of two…
Constraining modified gravity theories with physical black holes
Sebastian Murk
We review the constraints modified theories of gravity must satisfy to be compatible with the spherically symmetric black hole solutions of semiclassical gravity that describe the…
Physical black holes in fourth-order gravity
Sebastian Murk
The existence of black holes is a central prediction of general relativity and thus serves as a basic consistency test for modified theories of gravity. In spherical symmetry, only…
Physical black holes in semiclassical gravity
Sebastian Murk, Daniel R. Terno
We derive and critically examine the consequences that follow from the formation of a regular black or white hole horizon in finite time of a distant observer. In spherical symmetr…
Semiclassical black holes and horizon singularities
Pravin K. Dahal, Sebastian Murk, Daniel R. Terno
In spherical symmetry, solutions of the semiclassical Einstein equations belong to one of two possible classes. Both classes contain solutions that -- depending on the dynamic beha…
Paradoxes before the paradox: surface gravity and the information loss problem
Robert B. Mann, Sebastian Murk, Daniel R. Terno
The information loss paradox is widely regarded as one of the biggest open problems in theoretical physics. Several classical and quantum features must be present to enable its for…
Spherically symmetric black holes in metric gravity
Sebastian Murk, Daniel R. Terno
The existence of black holes is one of the key predictions of general relativity (GR) and therefore a basic consistency test for modified theories of gravity. In the case of spheri…
Universal properties of the near-horizon geometry
Sebastian Murk, Daniel R. Terno
We derive universal properties of the near-horizon geometry of spherically symmetric black holes that follow from the observability of a regular apparent horizon. Only two types of…
Black hole evaporation and semiclassical thin shell collapse
Valentina Baccetti, Sebastian Murk, Daniel R. Terno
In case of spherical symmetry, the assumptions of finite-time formation of a trapped region and regularity of its boundary --- the apparent horizon --- are sufficient to identify t…
Energy-momentum tensor and metric near the Schwarzschild sphere
Valentina Baccetti, Robert B. Mann, Sebastian Murk +1
Regularity of the horizon radius of a collapsing body constrains a limiting form of a spherically-symmetric energy-momentum tensor near it. Its non-zero limit belongs to one…