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Dark Matter from vector-like Technicolor
Southern Federal University (Rostov-on-Don, Russia)
Maxim Bezuglov Vladimir Kuksa Vitaly Beylin

QFTHEP'2015 , Samara


Scalar T-diquark states as a possible Dark Matter
.

T-pion fields T-baryon fields DM candidate
· Stability on cosmological time scales · Weak participation in the electromagnetic interaction
Roman Pasechnik, Vitaly Beylin, Vladimir Kuksa, Grigory Vereshkov. arXiv:1407.2392 (2014)


T-baryon mass splitting

The T-baryon mass splitting is due to the electroweak interaction


T-baryon mass splitting

,

-masses of the weak bosons -Fermi constant -mass of the T-baryon


T-baryon mass splitting


Calculation of relic abundance
High symmetry phase: Low symmetry phase: Freeze-out temperature:

We consider T-baryon abundance formation mainly in low-symmetry phase .
(1)
G. Steigman, B. Dasgupta and J. F. Beacom, Phis. Rev. D 86 ,023506 (2012)

- effective kinetic T-baryon annihilation cross section
G. Hinshaw et al. [WMAP Collaboration], Astrophys. J. Suppl. 208, 19 (2013)

T-baryon asymmetry?


Account of coannihilation processes

Coannihilation processes

(2)

Kim Griest, David Seckel, Phis. Rev. D 43 ,3191 (1991)

We shall assume that the initial density of all components of the T-baryon triplet is essentially the same


Table of all the (co)annihilation processes

-Approximation


Theoretical parameters
-mass of the T-baryon -mass of the T-sigma -mass of the T-pion
-mass of the Higgs boson
Scalar self-couplings

Variable parameters :

-small Higgs-T-sigma mixing limit


Kinetic T-baryon coannihilation cross section

The T-baryon (co)annihilation cross section in the (pseudo)scalar and spinor channels vanishes in the small Higgs-T-sigma mixing limit:


The ratio of relic abundance calculated with account of coannihilation processes to the one without them as a function of ( , ) on the left and ( , ff ) on the right


The relic T-baryon abundance as a function of ( , f ) on the left and ( , ) on the right

We can not say anything definite about the ( in the analysis of the relic T-baryon density .

)


The relic T-baryon abundance as a function of ( ,)

Symmetric DM formation is possible only under specific parameter values: ,


· T-baryon sector, with respect to its possible important role for DM astrophysics has been considered; · Mass splitting between charged and uncharged T-baryons appears to be relatively small : ; · Coannihilation processes is wary important for the formation of the relic T-baryon density; · In the low-symmetry phase symmetric T-baryon DM formation is possible only under specific parameter values: , ; · The small value of ( Higgs-T-sigma mixing ; ) is in agreement with the small

Conclusion and discussions

· These estimates allow us to specify in what area of energy we can expect the signal of Technicolor Physics;


Thank you for your attention!