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28 March 2024
 
  » arxiv » hep-th/0307011

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Echoing the extra dimension
A. O. Barvinsky ; Sergey N. Solodukhin ;
Date 1 Jul 2003
Journal Nucl.Phys. B675 (2003) 159-178
Subject High Energy Physics - Theory; Mathematical Physics | hep-th astro-ph gr-qc hep-ph math-ph math.MP
AbstractWe study the propagating gravitational waves as a tool to probe the extra dimensions. In the set-up with one compact extra dimension and non-gravitational physics resigning on the 4-dimensional subspace (brane) of 5-dimensional spacetime we find the Green’s function describing the propagation of 5-dimensional signal along the brane. The Green’s function has a form of the sum of contributions from large number of images due to the compactness of the fifth dimension. Additionally, a peculiar feature of the causal wave propagation in five dimensions (making a five-dimensional spacetime very much different from the familiar four-dimensional case) is that the entire region inside the past light-cone contributes to the signal at the observation point. The 4-dimensional propagation law is nevertheless reproduced at large (compared to the size of extra dimension) intervals from the source as a superposition of signals from large number of images. The fifth dimension however shows up in the form of corrections to the purely 4-dimensional picture. We find three interesting effects: a tail effect for a signal of finite duration, screening at the forefront of this signal and a frequency-dependent amplification for a periodic signal. We discuss implications of these effects in the gravitational wave astronomy and estimate the sensitivity of gravitational antenna needed for detecting the extra dimension.
Source arXiv, hep-th/0307011
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