paper

Gravitational Waves from Mesoscopic Dynamics of the Extra Dimensions

arXiv:astro-ph/0005044 · doi:10.1103/PhysRevLett.85.2044

Abstract

Recent models which describe our world as a brane embedded in a higher dimensional space introduce new geometrical degrees of freedom: the shape and/or size of the extra dimensions, and the position of the brane. These modes can be coherently excited by symmetry breaking in the early universe even on ``mesoscopic'' scales as large as 1 mm, leading to detectable gravitational radiation. Two sources are described: relativistic turbulence caused by a first-order transition of a radion potential, and Kibble excitation of Nambu-Goldstone modes of brane displacement. Characteristic scales and spectral properties are estimated and the prospects for observation by LISA are discussed. Extra dimensions with scale between 10 Åand 1 mm, which enter the 3+1-D era at cosmic temperatures between 1 and 1000 TeV, produce backgrounds with energy peaked at observed frequencies in the LISA band, between and Hz. The background is detectable above instrument and astrophysical foregrounds if initial metric perturbations are excited to a fractional amplitude of or more, a likely outcome for the Nambu-Goldstone excitations.

Latex, 5 pages, plus one figure, final version to appear in Phys. Rev. Lett

References in corpus (4)

Cited by in corpus (27)