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Hier wird Wissen Wirklichkeit 1 Black holes and "remnants" at the LHC Benjamin Koch FIGSS/University of Frankfurt

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Hier wird Wissen Wirklichkeit 2 Outline What are Large eXtra Dimensions and Motivation Observables for LXDs Black holes in 4+d dimensions Production and decay of black holes in 4+d dimensions Results Outlook

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Hier wird Wissen Wirklichkeit 3 Models with LXDs Main motivation hierachy problem: Why is gravitation so weak? String theory suggests XDs but it is hard to make predictions Effective theories with LXDs: Arkani-Hamed, Dimopoulos & Dvali (ADD) Randall & Sundrum (RS) Universal Extra Dimensions (UXD) All contain one or more eXtra dimensions that are compactified on a radius that is so small that it could not be observed up to now.

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Hier wird Wissen Wirklichkeit 4 The ADD model Newton with LXDs: 3+d space like dimensions d dimensions on d-torus with radii R only gravity propagates in all dimensions (bulk) all other in 4-dim. space time (brane) : : N. Arkani-Hamed, S. Dimopoulos and G. R. Dvali, Phys. Lett. B 429, 263 (1998);

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Hier wird Wissen Wirklichkeit 5 Observables of LXDs Strongest constraints on R for all d More than 1 XD Newton checked to m range 400 TeV ultra high energetic cosmic rays 14 TeV Large Hadron Collider LHC TeV region todays colliders MeV region supernova and neutronstar cooling Measuring Newtons law CM Energy/n Possible observables - microscopic black holes - graviton production- modified cross sections

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Hier wird Wissen Wirklichkeit 6 - XD black hole in macro-cosmos RHRH Black holes in 4+d dimensions -Topology of the horizon -Topology of the horizon - XD black hole in micro-cosmos

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Hier wird Wissen Wirklichkeit 7 - S. Dimopoulos and G. Landsberg Phys. Rev. Lett. 87, (2001). - M. B. Voloshin, Phys. Lett. B 518, 137 (2001); Phys. Lett. B 524, 376 (2002). - S. B. Giddings, ed. N. Graf, eConf C010630, P328 (2001). - S. N. Solodukhin, Phys. Lett. B 533, 153 (2002). - H. Yoshino and V. S. Rychkov, Phys. Rev. D 71 (2005) Konsens finally... most confirm geometrical estimate of cross section; with: Vital discussion Production

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Hier wird Wissen Wirklichkeit 8 Decay - "Balding phase":BH gets rid of its hair mainly via gravitational radiation ->not visible in detector - Hawking phase: decay mainly into standard-model particles. - R. Emparan, G. T. Horowitz and R. C. Myers Phys. Rev. Lett. 85, 499 (2000) - S. B. Giddings and S. Thomas, Phys. Rev. D (2002). - C. M. Harris, M. J. Palmer, M. A. Parker, P. Richardson, A. Sabetfakhri and B. R. Webber, [arXiv:hep-ph/ ]... - Final state: Two possible scenarios - Hawking radiation continues until M BH....M f and then performes something like a final decay - Rapid decay slows down to form quasistable remnant - Y. B. Zeldovich, in: Proc. 2nd Seminar in Quantum Gravity, edited by M. A. Markov and P. C. West, Plenum, New York (1984). - R. J. Adler, P. Chen and D. I. Santiago, Gen. Rel. Grav. 33, 2101 (2001) - J. D. Barrow, E. J. Copeland and A. R. Liddle, Phys. Rev. D 46, 645 (1992). - S. Coleman, J. Preskill and F. Wilczek, Mod. Phys. Lett. A (1991). - S. Hossenfelder, M. Bleicher, S. Hofmann, H. Stocker and A. Kotwal, Phys. Lett. B 566, Rizzo

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Hier wird Wissen Wirklichkeit 9 Modified decay in the presence of quasistable black hole Corrections to the standard hawking evaporations should are presumable suppressed by factors of M f /M BH therefore the entropy of a micro-black hole can be written as In the micro canonical picture the Mass evotution is given by This gives in the limit M>>MR the macro canonical Hawking rate

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Hier wird Wissen Wirklichkeit 10 Mass evolution These spectra were incorporated into an event generator(based on Pythia) and the results were compared to an event generator without quasi stable black holes: "charybdis" Black hole for M f =M R =1 TeV a 0 =1,a i =0 C. M. Harris, P. Richardson and B. R. Webber, JHEP 0308, 033 (2003) [arXiv:hep-ph/ ]

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Hier wird Wissen Wirklichkeit 11 Results Quasi-stable black holes distinguishable from complete BH decay: But how can we tell that it was a BH at all? B. Koch, M.Bleicher and S.Hossenfelder, ``Black hole remnants at the LHC,'' JHEP 0510 (2005) 053

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Hier wird Wissen Wirklichkeit 12 Results - A charged remnant could be seen in the detector directely - A completely decaying BH requests carefull triggering and selection of observables: S.Hossenfelder, B.Koch and M.Bleicher, ``Trapping black hole remnants,'' arXiv:hep-ph/ T. Humanic, " Extra-dimensional physics with p+p in the ALICE Experiment" Alice-Internal note- (preliminary)

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Hier wird Wissen Wirklichkeit 13 Summary - In LXD scenarios a large number of microsc black holes will be produced at the LHC - A final decay or a quasi stable black hole should be distinguishable by just observing the decay products!

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Hier wird Wissen Wirklichkeit 14 - Closer look at possible observables and comparison to other beyond the standard model scenarios - Looking forward to LHC data Outlook thanks to Marcus Bleicher, Sabine Hossenfelder, Horst Stoecker, Tom Humanic, Ulrich Harbach

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