Chaotic spin precession in anisotropic universes and fermionic dark matter

Kamenshchik, Alexander Yu.; Teryaev, Oleg

doi:10.1134/s1547477116030122

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…It is very small when scattering by a single object is considered but may be enhanced when a neutrino propagates in the Universe. This effect can be especially strong for anisotropic Bianchi universes [21]. The anisotropy of the Universe leads to precession of spin (and, according to the EP, as discussed above, to the helicity flip) with a characteristic timescale on the order of a very early Universe age.…”

Section: -4mentioning

confidence: 99%

Gravitational form factors and nucleon spin structure

Teryaev¹

2016

Front. Phys.

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Nucleon scattering by the classical gravitational field is described by the gravitational (energymomentum tensor) form factors (GFFs), which also control the partition of nucleon spin between the total angular momenta of quarks and gluons. The equivalence principle (EP) for spin dynamics results in the identically zero anomalous gravitomagnetic moment, which is the straightforward analog of its electromagnetic counterpart. The extended EP (ExEP) describes its (approximate) validity separately for quarks and gluons and, in turn, results in equal partition of the momentum and total angular momentum. It is violated in quantum electrodynamics and perturbative quantum chromodynamics (QCD), but may be restored in nonperturbative QCD because of confinement and spontaneous chiral symmetry breaking, which is supported by models and lattice QCD calculations. It may, in principle, be checked by extracting the generalized parton distributions from hard exclusive processes. The EP for spin-1 hadrons is also manifested in inclusive processes (deep inelastic scattering and the Drell-Yan process) in sum rules for tensor structure functions and parton distributions. The ExEP may originate in either gravity-proof confinement or in the closeness of the GFF to its asymptotic values in relation to the mediocrity principle. The GFFs in time-like regions reveal some similarity between inflation and annihilation.

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Section: -4mentioning

confidence: 99%

Gravitational form factors and nucleon spin structure

Teryaev¹

2016

Front. Phys.

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“…This opens [12], in principle, the possibility to attribute the dark matter to the contribution of light sterile neutrinos whose abundance would be much larger than that of thermal ones. The validity of (6.3) would require a sort of fine tuning, but not too strong one, as the required excess of sterile neutrinos is about two orders of magnitude, and the closeness of the rotation angle to π should be also at the percent level.…”

Section: Precession In a Bianchi-ix Universementioning

confidence: 99%

“…Finally, the non-vanishing components of the "gravitomagnetic" contribution to the precession of the Dirac particle in the Bianchi-I universe is, up to cyclic permutations [16],…”

Section: The Precession Of the Dirac Particle In A Gravitational Fieldmentioning

confidence: 99%

Spin precession in anisotropic cosmologies

Kamenshchik

Teryaev

2016

Eur. Phys. J. C

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We consider the precession of a Dirac particle spin in some anisotropic Bianchi universes. This effect is present already in the Bianchi-I universe. We discuss in some detail the geodesics and the spin precession for both the Kasner and the Heckmann-Schucking solutions. In the Bianchi-IX universe the spin precession acquires the chaotic character due to the stochasticity of the oscillatory approach to the cosmological singularity. The related helicity flip of fermions in the very early universe may produce the sterile particles contributing to dark matter.

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Manifestations of the rotation and gravity of the Earth in high-energy physics experiments

2016

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The inertial (due to rotation) and the gravitational fields of the Earth affect the motion of an elementary particle and its spin dynamics. This influence is not negligible and should be taken into account in high-energy physics experiments. Earth's influence is manifest in perturbations in the particle motion, in an additional precession of the spin, and in a change of the constitutive tensor of the Maxwell electrodynamics. Bigger corrections are oscillatory and their contributions average to zero. Other corrections due to the inhomogeneity of the inertial field are not oscillatory but they are very small and may be important only for the storage ring electric dipole moment experiments. Earth's gravity causes the Newton-like force, the reaction force provided by a focusing system, and additional torques acting on the spin. However, there are no observable indications of the electromagnetic effects due to Earth's gravity.

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Chaotic spin precession in anisotropic universes and fermionic dark matter

Cited by 4 publications

References 28 publications

Gravitational form factors and nucleon spin structure

Gravitational form factors and nucleon spin structure

Spin precession in anisotropic cosmologies

Manifestations of the rotation and gravity of the Earth in high-energy physics experiments

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