Speaker
Jani Dahl
(University of Helsinki)
Description
A first-order phase transition in the early universe acts as a potential source of primordial gravitational waves (GWs). For a wide range of scenarios, the dominant GW contribution is believed to arise from sound waves, whose decay through acoustic turbulence plays a vital role in determining the intensity of the ensuing GW signal. To study this decay, we have developed a relativistic hydrodynamic simulation code based on the first-order viscous BDNK formulation, which is causal and stable across a range of hydrodynamic frames. The relativistic hyperbolic conservation laws are solved numerically using a finite volume scheme with shock-capturing methods to ensure accurate conservation and shock resolution.
Author
Jani Dahl
(University of Helsinki)
Co-authors
David Weir
(University of Helsinki)
Kari Rummukainen
Prof.
Mark Hindmarsh
(University of Helsinki, University of Sussex)