Scalar Bremsstrahlung in Gravity-Mediated Ultrarelativistic Collisions

Details Scalar Bremsstrahlung in Gravity-Mediated Ultrarelativistic Collisions Scalar Bremsstrahlung in Gravity-Mediated Ultrarelativistic Collisions

2011-06-17

arxiv.org/abs/1106.3509v1

Physics

High Energy Physics

High Energy Physics - Theory

26 pages, 7 figures

Scientific paper

Classical bremsstrahlung of a massless scalar field $\Phi$ is studied in gravity mediated ultra-relativistic collisions with impact parameter $b$ of two massive point particles in the presence of $d$ non-compact or toroidal extra dimensions. The spectral and angular distribution of the scalar radiation are analyzed, while the total emitted $\Phi-$energy is found to be strongly enhanced by a $d-$dependent power of the Lorentz factor $\gamma$. The direct radiation amplitude from the accelerated particles is shown to interfere destructively (in the first two leading ultra-relativistic orders) with the one due to the $\Phi-\Phi-graviton$ interaction in the frequency regime $\gamma/b\lesssim \omega \lesssim \gamma^2/b$ in all dimensions.

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