158 citations · 271 across the 7 of their papers we have counts for
7 papers
Black hole mimickers: from theory to observation
Cosimo Bambi, Ramy Brustein, Vitor Cardoso +16
The black hole paradigm, while remarkably successful, raises fundamental questions-both classical and quantum-about the nature of spacetime, horizons, and singularities. Black hole…
Constraining Dirty Black Holes and pseudo-complex General Relativity with the Gravitational Waves Transient Catalog 3.0
Yehu I. Maimon, Alex B. Nielsen, Ofek Birnholtz
We use data from the Gravitational Wave Transient Catalog 3.0 to update constraints on parameterized deviations from General Relativity, as encountered in pseudo-complex general re…
Possible Causes of False General Relativity Violations in Gravitational Wave Observations
Anuradha Gupta, K. G. Arun, Enrico Barausse +40
General relativity (GR) has proven to be a highly successful theory of gravity since its inception. The theory has thrivingly passed numerous experimental tests, predominantly in w…
Constraining parametric deviations from the Kerr spacetime using black hole ringdowns of GW150914 and GW190521
Zaryab Ahmed, Shilpa Kastha, Alex B. Nielsen
The ringdown phase of a binary black hole merger is modelled by the quasi-normal modes of a perturbed Kerr black hole. According to the black hole no-hair theorem, the emitted ring…
1PN effective binary Lagrangian for the gravity-Kalb-Ramond sector in the conservative regime
Vegard Undheim, Alex Bentley Nielsen, Eirik Eik Svanes
Within the framework of string theory, a number of new fields are possible correcting the Einstein-Hilbert action, including a Kalb-Ramond two-form field. In this work we derive ex…
Black holes and black hole thermodynamics without event horizons
Alex B. Nielsen
We investigate whether black holes can be defined without using event horizons. In particular we focus on the thermodynamic properties of event horizons and the alternative, locall…