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Spacetime Deformation Effect on the Early Universe and the PTOLEMY Experiment

Horvat, Raul; Trampetić, Josip; You, Jiangyang (2017) Spacetime Deformation Effect on the Early Universe and the PTOLEMY Experiment. Modern physics letters B, 772 (10). pp. 130-135. ISSN 0217-9849

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Using a fully-fledged formulation of gauge field theory deformed by the spacetime noncommutativity, we study its impact on relic neutrino direct detection, as proposed recently by the PTOLEMY experiment. The noncommutative background tends to influence the propagating neutrinos by providing them with a tree-level vector-like coupling to photons, enabling thus otherwise sterile right-handed (RH) neutrinos to be thermally produced in the early universe. Such a new component in the universe's background radiation has been switched today to the almost fully active sea of non-relativistic neutrinos, exerting consequently some impact on the capture on tritium at PTOLEMY. The peculiarities of our nonperturbative approach tend to reflect in the cosmology as well, upon the appearances of the coupling temperature, above which RH neutrinos stay permanently decoupled from thermal environment. This entails the maximal scale of noncommutativity as well, being of order of 10^{; ; −4}; ; M_{; ; Pl}; ; , above which there is no impact whatsoever on the capture rates at PTOLEMY. The latter represents an exceptional upper bound on the scale of noncommutativity coming from phenomenology.

Item Type: Article
Uncontrolled Keywords: Big Bang nucleosynthesis, Neutrinos, Noncommutative geometry
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Physical Chemistry
Project titleProject leaderProject codeProject type
prema kvantnoj gravitaciji: nekomutativna geometrija, teorija polja i kozmologija-tqgngftcStjepan MeljanacIP-2014-09-9582HRZZ
Depositing User: Jiangyang You
Date Deposited: 18 Jan 2018 16:04
DOI: 10.1016/j.physletb.2017.06.028

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