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260 papers · 1 filter
Timing-Window Mechanism for Chain-Like Transients in Collisions of Radially Excited Boson Stars
Bo-Xuan Ge
We show that chain-like transients in head-on collisions of radially excited boson stars are controlled by the binary collision time, not by radial excitation alone. For selected \…
The most general four-derivative Unitary String Effective Action with Torsion and Stringy-Running-Vacuum-Model Inflation: Old ideas from a modern perspective
Nick E. Mavromatos, George Panagopoulos
The string-inspired running vacuum model (StRVM) of inflation is based on a Chern-Simons (CS) gravity effective action, in which the only four-spacetime-derivative-order term is a…
Massive boson stars: Stability and GW emission in head-on mergers
Bo-Xuan Ge
We investigate quartically self-interacting massive boson stars by constructing equilibrium sequences and performing dynamical evolutions. The mass curve along these seq…
A bigravity model from noncommutative geometry
Marco de Cesare, Mairi Sakellariadou, Araceli Soler Oficial
Noncommutative gravity, based on a twist-deformation of the differential geometry of spacetime and a first-order formulation of the dynamics, requires additional gravitational degr…
Search for planetary-mass ultra-compact binaries using data from the first part of the LIGO--Virgo--KAGRA fourth observing run
The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1765
We present a search for gravitational waves from inspiraling, planetary-mass ultra-compact binaries using data from the first part of the fourth observing run of LIGO, Virgo and KA…
Testing general relativity with amplitudes of subdominant gravitational-wave modes
Ish Gupta, Purnima Narayan, Lionel London +2
We present an improved subdominant-mode amplitude (SMA) test of general relativity (GR), which probes amplitude-level deviations in the higher-order modes of gravitational-wave (GW…