Abstract:
In TeV-gravity models the gravitational coupling to particles with energies $\mathcal E\sim m_{Pl}\sim10\,$TeV is not suppressed by powers of ultra-small ratio $\mathcal E/M_{Pl}$ with $M_{Pl}\sim10^{19}$ GeV. Therefore one could imagine strong synchrotron radiation of gravitons by the accelerating particles to become the most pronounced manifestation of TeV-gravity at LHC. However, this turns out to be not true: considerable damping continues to exist, only the place of $\mathcal E/M_{Pl}$ it taken by a power of a ratio $\vartheta\omega/\mathcal E$, where the typical frequency $\omega$ of emitted radiation, while increased by a number of $\gamma$-factors, can not reach $\mathcal E/\vartheta$ unless particles are accelerated by nearly critical fields. Moreover, for currently available magnetic fields $B\sim10\,$T, multi-dimensionality does not enhance gravitational radiation at all even if TeV-gravity is correct.
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