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arXiv · 2103.09240

Warp factor and the gravitational wave spectrum

David Andriot·Paul Marconnet·Dimitrios Tsimpis
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Abstract

A distinct signature of compact extra dimensions would be a Kaluza-Klein tower of gravitational waves. Motivated by this prospect, we compute the corresponding spectrum on a warped toroidal background. We evaluate in particular the impact of the warp factor on the spectrum. To that end, we use the complete warp factor H of standard string compactifications, generated by D-branes and orientifolds, thus connecting to recent works on stringy de Sitter constructions. The problematic region close to an orientifold where H < 0 leads to unphysical tachyonic modes in the spectrum. We develop tools that overcome this difficulty and lead to a tachyon-free spectrum. We show, in particular, that the warp factor can lower the first Kaluza-Klein mass by at least 69%.

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David Andriot, Paul Marconnet, Dimitrios Tsimpis. 2021-03-16. Warp factor and the gravitational wave spectrum. https://doi.org/10.1088/1475-7516/2021/07/040

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