Gravitational Wave Production by Collisions: More Bubbles

Details Gravitational Wave Production by Collisions: More Bubbles Gravitational Wave Production by Collisions: More Bubbles

2008-06-11

arxiv.org/abs/0806.1828v2

JCAP 0809:022,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 4 figures; some comments added, published version

Scientific paper

10.1088/1475-7516/2008/09/022

We reexamine the production of gravitational waves by bubble collisions during a first-order phase transition. The spectrum of the gravitational radiation is determined by numerical simulations using the "envelope approximation". We find that the spectrum rises as f^3.0 for small frequencies and decreases as f^-1.0 for high frequencies. Thus, the fall-off at high frequencies is significantly slower than previously stated in the literature. This result has direct impact on detection prospects for gravity waves originating from a strong first-order electroweak phase transition at space-based interferometers, such as LISA or BBO. In addition, we observe a slight dependence of the peak frequency on the bubble wall velocity.

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