Spanish and Portuguese Relativity Meeting

Session

Parallel session 5 (Gravitational Waves)

23 Jul 2024, 14:30

Conveners

Parallel session 5 (Gravitational Waves)

• Session convener: Fabrizio Rompineve

95. Gravitational waves from boson star mergers

Dr Daniela Cors Agulló (University of Cambridge)

23/07/2024, 14:30

We provide results of the gravitational wave energy emitted by head-on collisions of equal-mass solitonic boson stars. Our numerical simulations span a two-dimensional parameter space, where a range of values for the central amplitude of the star is considered for different values of the solitonic constant. We report gravitational wave energies emitted by the merger of fluffy (less compact)...

33. Numerical Relativity Simulations of Dark Matter Admixed Neutron Star Mergers: Unveiling Effects on Gravitational Waves and Ejecta

Edoardo Giangrandi (University of Coimbra, University of Potsdam)

23/07/2024, 14:45

We present a novel study of the impact of asymmetric dark matter (DM) on the dynamics of binary neutron star (BNS) mergers and the associated gravitational wave (GW) signatures. Utilizing numerical relativity simulations with a recently developed framework for DM admixed BNS, we analyze not only the emitted GW signal but also the dynamical behavior of the ejected material (ejecta) during and...

92. Gravitational wave fluxes for a spinning particle in the Hamilton-Jacobi formalism

Gabriel Andres Piovano (University College Dublin)

23/07/2024, 15:00

Extreme mass-ratio inspirals (EMRIs) are one of the most intriguing sources of gravitational waves. An EMRI binary consists of a stellar mass compact object falling into a supermassive black hole. Thanks to such a large disparity in scales, we can model these binaries, in first approximation, as a point particle (the ``secondary'') free-falling into the spacetime generated by the more massive...

57. Propagation and emission of gravitational waves in the weak-field limit within the Palatini formalism

Mr Albert Duran-Cabacés (Universidad de Valladolid)

23/07/2024, 15:15

In the era of gravitational waves physics, when detections of wave fronts are increasing in number, sensitivity, frequencies and distances, gravitational physics has entered a period of maximum activity and brilliance. This has opened a new window where General Relativity can be challenged in both weak and strong-field regimes. For this reason, modified theories of gravity have been proposed,...

46. New windows onto nHz Gravitational Wave science with astrometry

Giorgio Mentasti

23/07/2024, 15:30

We present a summary of novel techniques based on astrometry science and exploiting the joint measurement from astrometric surveys and Pulsar Timing Array to constraint the production of gravitational waves in the nHz band. We address our presentation on the possibility of probing a stochastic GW background with data coming from existing and planned optical surveys, such as Gaia and LSST,...

11. Resonance absorption of gravitational waves and modified gravity in the forthcoming LISA project

Luis Acedo Rodríguez (University of Extremadura)

23/07/2024, 15:45

The recent release of NANOGrav's 15-year data strongly supports the
evidence for the existence of a stochastic gravitational wave background [1]. These waves could have originated by the merging of Supermassive Binary Black Holes (SMBBHs) throughout the history of the Universe. They also have a frequency in a range that could be resonant with the orbital periods in the Solar System and,...