Robert Benkel
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View article: Waveform Modelling for the Laser Interferometer Space Antenna
Waveform Modelling for the Laser Interferometer Space Antenna Open
LISA, the Laser Interferometer Space Antenna, will usher in a new era in gravitational-wave astronomy. As the first anticipated space-based gravitational-wave detector, it will expand our view to the millihertz gravitational-wave sky, wher…
View article: Tests of general relativity with binary black holes from the second LIGO-Virgo gravitational-wave transient catalog
Tests of general relativity with binary black holes from the second LIGO-Virgo gravitational-wave transient catalog Open
Gravitational waves enable tests of general relativity in the highly dynamical and strong-field regime. Using events detected by LIGO-Virgo up to 1 October 2019, we evaluate the consistency of the data with predictions from the theory. We …
View article: GW190412: Observation of a binary-black-hole coalescence with asymmetric masses
GW190412: Observation of a binary-black-hole coalescence with asymmetric masses Open
We report the observation of gravitational waves from a binary-black-hole coalescence during the first two weeks of LIGO’s and Virgo’s third observing run. The signal was recorded on April 12, 2019 at 05∶30∶44 UTC with a network signal-to-…
View article: GW190814: Gravitational Waves from the Coalescence of a 23 Solar Mass Black Hole with a 2.6 Solar Mass Compact Object
GW190814: Gravitational Waves from the Coalescence of a 23 Solar Mass Black Hole with a 2.6 Solar Mass Compact Object Open
We report the observation of a compact binary coalescence involving a 22.2-24.3 M o˙ black hole and a compact object with a mass of 2.50-2.67 M o˙ (all measurements quoted at the 90% credible level). The gravitational-wave signal, GW190814…
View article: Black holes, gravitational waves and fundamental physics: a roadmap
Black holes, gravitational waves and fundamental physics: a roadmap Open
The grand challenges of contemporary fundamental physics—dark matter, dark energy, vacuum energy, inflation and early universe cosmology, singularities and the hierarchy problem—all involve gravity as a key component. And of all gravitatio…
View article: Causal structure of black holes in shift-symmetric Horndeski theories
Causal structure of black holes in shift-symmetric Horndeski theories Open
In theories with derivative (self-)interactions, the propagation of\nperturbations on nontrivial field configurations is determined by effective\nmetrics. Generalized scalar-tensor theories belong in this class and this\nimplies that the m…
View article: Dynamical obstruction to perpetual motion from Lorentz-violating black holes
Dynamical obstruction to perpetual motion from Lorentz-violating black holes Open
Black holes in Lorentz-violating theories have been claimed to violate the\nsecond law of thermodynamics by perpetual motion energy extraction. We revisit\nthis question for a Penrose splitting process in a spherically symmetric\nsetting w…
View article: Black hole hair formation in shift-symmetric generalised scalar-tensor gravity
Black hole hair formation in shift-symmetric generalised scalar-tensor gravity Open
A linear coupling between a scalar field and the Gauss-Bonnet invariant is\nthe only known interaction term between a scalar and the metric that: respects\nshift symmetry; does not lead to higher order equations; inevitably introduces\nbla…
View article: Dynamical scalar hair formation around a Schwarzschild black hole
Dynamical scalar hair formation around a Schwarzschild black hole Open
Scalar fields coupled to the Gauss-Bonnet invariant evade the known no-hair\ntheorems and have nontrivial configurations around black holes. We focus on a\nscalar field that couples linearly to the Gauss-Bonnet invariant and hence\nexhibit…