Physics Topics

Physics

New science study results from C. Caprini et al described

2010 FEB 9 - (VerticalNews.com) -- According to a study from France, "We analytically derive the spectrum of gravitational waves due to magneto-hydrodynamical turbulence generated by bubble collisions in a first-order phase transition. In contrast to previous studies, we take into account the fact that turbulence and magnetic fields act as sources of gravitational waves for many Hubble times after the phase transition is completed."

"This modifies the gravitational wave spectrum at large scales. We also model the initial stirring phase preceding the Kolmogorov cascade, while earlier works assume that the Kolmogorov spectrum sets in instantaneously. The continuity in time of the source is relevant for a correct determination of the peak position of the gravitational wave spectrum. We discuss how the results depend on assumptions about the unequal-time correlation of the source and motivate a realistic choice for it. Our treatment gives a similar peak frequency as previous analyses but the amplitude of the signal is reduced due to the use of a more realistic power spectrum for the magneto-hydrodynamical turbulence," wrote C. Caprini and colleagues.

The researchers concluded: "For a strongly first-order electroweak phase transition, the signal is observable with the space interferometer LISA."

Caprini and colleagues published their study in the Journal of Cosmology and Astroparticle Physics (The stochastic gravitational wave background from turbulence and magnetic fields generated by a first-order phase transition. Journal of Cosmology and Astroparticle Physics, 2009;(12):24).

For more information, contact C. Caprini, CEA, IPhT, F-91191 Gif Sur Yvette, France.

Publisher contact information for the Journal of Cosmology and Astroparticle Physics is: IOP Publishing Ltd., Dirac House, Temple Back, Bristol BS1 6BE, England.

Keywords: Electronics, Gravitational Waves, Magnetic Field, Physics.