Branon Dark Matter J.A.R. Cembranos A.Dobado A.L. Maroto

Report
Branon Dark Matter
J.A.R. Cembranos
A.Dobado
A.L. Maroto
Phys. Rev. Lett. 90, 241301 (2003)
Phys.Rev. D68: 103505, (2003)
Phys.Rev. D69: 101304, (2004)
Introduction: brane fluctuations
- Rigid branes ( f >> MD)
KK modes
Brane-world
scenario
(ADD, 98)
- Flexible branes (f << MD)
Branon fields
(KK modes decouple from SM)
Bando et al. ‘99
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Brane fluctuations
• Bulk metric:
• Brane position:
• Branon fields:
• Branon mass related to bulk curvature:
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Branon dynamics
• Induced metric on the brane:
• Dirac-Nambu-Goto action:
Branon effective action
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Sundrum’ 99,
Dobado & A.L.M ‘01
4
Limits from colliders
• Induced metric on the brane:
LEP-II
...
TEVATRON-I
+ ...
hep-ex/0407017
• Dirac - Nambu - Goto action:
Branon action
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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
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Branon cosmic abundance
Freeze-out in an expanding universe:
Annihilation into all SM pairs X :
,
e.g. annihilation into photons,
Cold branons (M >> T)
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:
Hot branons (M << T)
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Branon cosmic abundance
Cold branons
WMAP limits
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Branon cosmic abundance
Hot branons
WMAP
BBN limits:
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WMAP-CBI-ACBAR-2dF-Ly-a
for
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Combined limits
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Direct detection
Elastic branon-nucleon
cross section
(spin independent)
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Non-thermal branon production
If TRH<< Tf and TRH >> L (L explicit symmetry breaking scale).
Branons are essentially massless 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:
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Cosmic coincidence problem
AdS6 soliton solution
Branon mass:
Fundamental scale:
Bulk C.C. (loop effects):
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Conclusions and future perspectives
• Branons are natural dark matter candidates in brane-world
models.
• Produced as thermal or non-thermal relics (cosmic coincidence)
... or strongly self-interacting dark matter.
• They could be detected in future direct search experiments
(CDMS, CRESST II, ...).
• Indirect detection from halo annihilations into photons or e+e- by
MAGIC, GLAST or AMS (coll.).
• Indirect detection by ANTARES, IceCube, ... from annihilation
into high-energy neutrinos.
• L3 coll. direct searches (published results)
• Future searches at hadronic (LHC) or Linear Colliders.
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