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Some model-independent phenomenological consequences of flexible brane-worlds

IRGAC 2006. Barcelona, July 11-15 2006. Some model-independent phenomenological consequences of flexible brane-worlds. J.A.R. Cembranos A. Dobado A. L. Maroto. Summary. Brane worlds: branons vs. KK gravitons Phenomenology in colliders Branons as dark matter Virtual branon effects.

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Some model-independent phenomenological consequences of flexible brane-worlds

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  1. IRGAC 2006 Barcelona, July 11-15 2006 Some model-independent phenomenological consequences of flexiblebrane-worlds J.A.R. Cembranos A. Dobado A. L. Maroto

  2. Summary • Brane worlds: branons vs. KK gravitons • Phenomenology in colliders • Branons as dark matter • Virtual branon effects Antonio L. Maroto

  3. Brane worlds: • branons vs. KK gravitons Antonio L. Maroto

  4. Introduction: brane worlds MD f4 R fundamental scale of gravity in D = 4 + d dimensions brane tension Brane hierarchy Brane universe ADD, 98 Antoniadis, et al. 98 Antonio L. Maroto

  5. Kaluza-Klein gravitons 3+1 coordinates extra-dimensional coordinates KK graviton tower Linearizing the bulk gravitational field KK graviton mass (torus compactif.) Antonio L. Maroto

  6. Branons (brane fluctuations) Brane position Isometry group of GMN Brane ground state Sundrum, ‘99 Dobado, A.L.M. ‘01 Branonspa(x) GB fields Spontaneous isometry breaking Coset space Antonio L. Maroto

  7. Branons • Bulk metric: • Branon mass related to bulk curvature: • Induced metric on the brane: Antonio L. Maroto

  8. Branon dynamics Dirac-Nambu-Goto Induced metric Antonio L. Maroto

  9. KK gravitons vs. branons KK-production Branon production Bando et al. ‘99 KK-SM coupling suppression Antonio L. Maroto

  10. KK gravitons vs. branons - Rigid branes ( f >> MD) Kaluza-Klein modes Brane-world scenario - Flexible branes (f << MD) Branon fields (KK modes decouple from SM) Antonio L. Maroto

  11. Phenomenology in colliders Antonio L. Maroto

  12. Limits from colliders LEP-II... TEVATRON-I + ... hep-ex/0407017 • Induced metric on the brane: • Dirac - Nambu - Goto action: Branon action Cembranos, Dobado, A.L.M, ’03 Antonio L. Maroto

  13. Prospects for future colliders Single photon-Z Monojet (quark production) Monojet (gluon prod.) Antonio L. Maroto

  14. Prospects for future colliders TEVATRON-II LHC ILC Cembranos, Dobado, A.L.M, ’04 Antonio L. Maroto

  15. Branons as dark matter Antonio L. Maroto

  16. A new dark matter candidate • Brane orientation branons are pseudoscalar particles • Parity on the brane branons couple by pairs to SM . (stable particles) Branons are stable, massive and weakly interacting particles NATURAL DARK MATTER CANDIDATES Cembranos, Dobado, A.L.M, ’03 Antonio L. Maroto

  17. e1 + - + e1 + e2 +p -p ê2 +p +p ê1 ê1 Parity on the brane P Odd-dimensional branes: pseudoscalar branons Even-dimensional branes: scalar branons P Antonio L. Maroto

  18. Branon cosmic abundance Freeze-out in an expanding universe: Annihilation into all SM pairs X : , e.g. annihilation into photons, : Cold branons (M >> T)Hot branons (M << T) Antonio L. Maroto

  19. Branon cosmic abundance Cold branons WMAP limits Antonio L. Maroto

  20. Branon cosmic abundance Hot branons WMAP WMAP-CBI-ACBAR-2dF-Ly-a BBN limits (light branons): for Antonio L. Maroto

  21. Combined limits Antonio L. Maroto

  22. Direct detection Elastic branon-nucleon cross section (spin independent) Antonio L. Maroto

  23. Non-thermal branon production (L = (M f2 RB)1/2explicit symmetry breaking scale). Branons are very light particles and decoupled from SM. Brane initial position: Y0 = O (RB) and p0 = f 2 RB Dark matter as coherent brane oscillations (similar to axions) If H(T) > G(T) for T < TRH brane oscillations only diluted by Hubble expansion. Non-thermal branon abundance: If L << TRH << Tf A.L.M, ’04 Antonio L. Maroto

  24. Non-thermal branon production Tf < (M MP)1/2 Antonio L. Maroto

  25. Virtual branon effects Antonio L. Maroto

  26. Radiative corrections One-loop SM effective action SM masses renormalization New SM vertices Cembranos, Dobado, A.L.M, ’06 Antonio L. Maroto

  27. Muon anomalous magnetic moment Cembranos, Dobado, A.L.M, ’06 Brookaven (g-2) coll. (2004) 2.7s above SM Antonio L. Maroto

  28. Conclusions and future perspectives Low-energy branon dynamics universally described by effective action depending on 3 parameters (M,f,N) For f << MD only branons and SM particles relevant degrees of freedom. Limits on (M,f) from present and future colliders Loop effects contribute to the muon anomalous magnetic moment Branons are natural dark matter candidates (thermal or non- thermal production) Future detection in direct or indirect experiments? Antonio L. Maroto

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