Gravitational Radiation from Primordial Helical MHD Turbulence

TL;DR

Compared to the unmagnetized EWPT case, the spectrum of MHD-turbulence-generated GWs peaks at lower frequency with larger amplitude and can be detected by the proposed Laser Interferometer Space Antenna.

Abstract

We consider gravitational waves (GWs) generated by primordial inverse-cascade helical magneto-hydrodynamical (MHD) turbulence produced by bubble collisions at the electroweak phase transitions (EWPT). Compared to the unmagnetized EWPT case, the spectrum of MHD-turbulence-generated GWs peaks at lower frequency with larger amplitude and can be detected by the proposed Laser Interferometer Space Antenna (LISA).

Figures (1)

• Figure 1: The spectrum of gravitational radiation from MHD turbulence for $g_\ast=100,~T_\ast=100~{\rm GeV},~\gamma=0.01$, and $M=1/\sqrt{3}$, for four different initial magnetic helicity values, $\alpha_\star=0$ (solid line), $\alpha_\star=0.02$ (dashed line), $\alpha_\star=0.05$ (dash-dotted line), and $\alpha_\star=0.1$ (dotted line). The bold line is the LISA design sensitivity curve.