Stochastic gravitational-wave background on large cosmological scales

Keywords: gravitational waves, stochastic background, dark matter, bias, tracers, power spectrum


Aim: To formulate a model capable of distinguishing astrophysical from primordial gravitational-wave signals.

Methods: We used a biased tracer formalism valid on large cosmological scales to introduce modeling basics and connected black holes as sources of gravitational wave signal with dark matter.

Results: By deriving the model and using the online tool Code for Anisotropies in the Microwave Background (CAMB), we produced the matter power spectrum and used it to construct the gravitational-wave power spectra as a linear biased tracer. The spectra were generated for different Hubble constants and bias parameter values, showing the difference in the amplitude and scale dependence of the spectra.

Conclusion: Gravitational-wave background signals can be used as complementary cosmological probes in data from future gravitational-wave space detectors like Laser Interferometer Space Antenna (LISA) and others.

Research Articles