The WIMP of a minimal walking Technicolor Theory

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The WIMP of a minimal walking Technicolor Theory

• J. Virkajärvi
• Jyväskylä University, Finland

with K.Kainulainen and K.Tuominen
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Outline

• Technicolor and the WIMP
• Dynamical Dark Energy
• and the WIMP density
• Model results
• Conclusion outlook

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Basic idea of Technicolor (TC)

• New gauge interaction TC which only
  technifermions feel
• Left and right handed fermions (massless) have
  SU(2)
• chiral symmetry

Early Universe High Temperature T gt TeV
Universe expands, T drops

• Technifermion condensate a composite Higgs
• ( (pseudo) Goldstone bosons)

• Spontaneus symmetry breaking dynamically
• Electroweak symmetry breaking
• Right mass ratio for EW gauge bosons

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Minimal Walking TC (WTC)

• Model Two techniquarks(flavors) in two index
  symmetric ( adjoint) presentation of an SU(2) TC
  gauge group.
• Witten anomaly cured by introducing a new
  Heavy lepton family
• Compatible with EW precision measurements

(Pure Majorana case)
(Sannino Tuominen, hep-ph/0405209 Dietrich,
Sannino Tuominen, hep-ph/0505059 )

• Near conformal (walking) ? FCNCs suppressed.

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Heavy neutrino mass term

• Dirac mass term for charged lepton
• For neutrino four cases
• 1. Pure Dirac mass term ( )
• 2. Pure Majorana mass term (M)
• 3. Mixed Dirac-Majorana mass term
• Two Weyl spinors
• 4. Flavor mixed Majorana mass term
• Two Weyl spinors

decays to the WIMP
Thermally averaged annihilation cross section
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Dynamical Dark Energy

• Dark Energy
• Dark Matter
• Baryonic Matter

• Quintessence
• Dark energy dominates the energy density at
  early times

SM only radiation
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Relic density and dynamical dark energy

• Relic density from Lee Weinberg equation
• Biggest effects to final abundance of the heavy
  neutrinos comes from the cross section and Hubble
  parameter

Number density
0 means T 1MeV
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Model results
Pure Dirac
Pure Majorana
Both cases compatible with nucleosynthesis since
r small (for masses shown).
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Model results (1.approx.)

• Flavor Mixed Majorana case

Similar results by Kouvaris (hep-ph/0703266) for
neutral bound state between techniquark and
technigluon
Yellow area Excluded by LEP
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Constraints to results

• Direct search limits

Pure Majorana, (mixed cases)
Upper limits for
Pure Dirac

• Limit from rotation curves halo models
• lower bound for local density

(Jungman, Kamionkowski, Griest, Phys. Rept. 267)
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Conclusion and outlook

• If a Quintessence-like Dark Energy dominates the
  early universe evolution
• 4th generation dirac neutrino (from MWTC) with
• m lt 800 GeV is excluded
• Majorana neutrino with m gt 100 GeV candidate for
  dark matter
• not excluded by direct searches
• In standard expansion case from flavor mixed
  Majorana mass term
• Mainly sterile Majorana neutrino with m gt 23 GeV
  candidate for dark matter not excluded by LEP or
  direct searches.
• Further studies
• Updating our different neutrino mixing results
• Other CDM (adjoint fermions) in extensions of
  MWTC
• Replacing Quintessence with more advanced DE
  models