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Title of Journal: Astrophys Space Sci

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Abbravation: Astrophysics and Space Science

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Springer Netherlands

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DOI

10.1007/s11218-008-9076-9

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1572-946X

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String black holes as particle accelerators to arb

Authors: Parthapratim Pradhan
Publish Date: 2014/03/26
Volume: 352, Issue: 1, Pages: 129-134
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Abstract

We show that an extremal GibbonsMaedaGarfinkleHorowitzStrominger black hole may act as a particle accelerator with arbitrarily high energy when two uncharged particles falling freely from rest to infinity on the near horizon We show that the center of mass energy of collision is independent of the extreme fine tuning of the angular momentum of the colliding particles We further show that the center of mass energy of collisions of particles at the ISCO r ISCO or at the photon orbit r ph or at the marginally bound circular orbit r mb ie at r≡r ISCO =r ph =r mb =2M could be arbitrarily large for the aforementioned spacetime which is quite different from the Schwarzschild and the ReissnerNordstrøm spacetime For nonextremal GMGHS spacetime the CM energy is finite and depends upon the asymptotic value of the dilation field ϕ 0

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