13-18 December 2015
International Conference Centre Geneva
Europe/Zurich timezone

Gravitational waves from a thermal first order phase transition: numerical simulations

16 Dec 2015, 15:24
Level 2, Room 13 (International Conference Centre Geneva)

Level 2, Room 13

International Conference Centre Geneva

17 Rue de Varembé, 1211 Geneva


David Weir (University of Stavanger)


We present large-scale numerical simulations of the gravitational radiation produced by a first order thermal phase transition in the early universe. The dominant source of gravitational waves is sound waves generated by the expanding bubbles of the low-temperature phase. The resulting gravitational wave power spectrum has a power-law form between scales set by the average bubble separation and the bubble wall width. However, the general form of the power spectrum is different from that predicted by the widely-applied envelope approximation, and the predicted gravitational wave energy density is at least two orders of magnitude larger.

Primary author

David Weir (University of Stavanger)

Presentation Materials