Gravitational wave observations of compact binaries allow us to test general relativity (and modifications thereof) in the strong and highly dynamical field regime gravity. Here, we confront two extensions relativity, Chern-Simons, Einstein-dilaton-Gauss-Bonnet theories, against gravitational sources from GWTC-1 GWTC-2 catalogs by LIGO-Virgo Collaboration. By stacking posterior individual event...

The sensitivities of current gravitational-wave detectors are limited around signal frequencies 100 Hz by mirror thermal noise. One proposed option to reduce this noise is operate the in a higher-order spatial laser mode. This operation would require high-power input beam such Here, we discuss generation Hermite–Gaussian modes HG2,2, HG3,3, and HG4,4 using one water-cooled light modulator (SLM)...

Based on the second-order moments definition, beam propagation factor of a new mathematical model Hollow higher-order Cosh-Gaussian (HhCG) beams is investigated. Analytical formula for M2-factor HhCG derived, which depends hollowness parameter l, order n, cosh part δ and waist ω0. The influences these parameters are illustrated with numerical examples. result provides more general characteristi...