Is there evidence for torsion?

Zhang, Chengmin; Yang, Gang; Chen, Fang-Pei; Wu, Xiaoguang

doi:10.1007/bf00760412

Cited by 14 publications

(7 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have proposed a consistent theoretical model 1 to explain the magnetic inclination (magnetic angle to the rotational axis) evolution of the normal pulsar, if the polarized neutron magnetic field of the normal pulsar is taken into account, which concludes the rotation-spin, torsion-spin and magnetic-spin interactions will influence the polarized magnetic field and make the magnetic inclination close to the rotational axis. 1 This conclusion is consistent with the astronomical observational evidence that the magnetic inclination of the pulsars decreases with increasing age of the pulsar, 2-4 and the decay time scale is about 10 6−7 years.…”

Section: Introductionsupporting

confidence: 89%

Rotation Intrinsic Spin Effects and Its Astrophysical Application

Zhang

1998

Mod. Phys. Lett. A

View full text Add to dashboard Cite

On the basis of rotation-spin, torsion-spin and magnetic-spin effects, by which the spin precession arises the polarized magnetic field of neutron star to incline to the rotational axis. In the case of accretion layer structure of the recycled pulsar and the companion star magnetic influence considered, the magnetic inclinations of the recycled pulsars are different from that of the normal radio pulsars. The theoretical conclusions and consistent observational evidence is discussed. 173 Mod. Phys. Lett. A 1998.13:173-180. Downloaded from www.worldscientific.com by MONASH UNIVERSITY on 02/03/15. For personal use only.

show abstract

Section: Introductionsupporting

confidence: 89%

Rotation Intrinsic Spin Effects and Its Astrophysical Application

Zhang

1998

Mod. Phys. Lett. A

View full text Add to dashboard Cite

show abstract

“…(12) with the spin connection in Eq. (15). It is interesting to note that the torsion axial-vector represents the deviation of the axial symmetry from the spherical symmetry [22].…”

Section: Dirac Equation In the Curved Spacetimementioning

confidence: 99%

“…Furthermore, the influence of the rotation-spin coupling on the magnetic inclination evolution of pulsars has also been investigated [15,16].…”

Section: Introductionmentioning

confidence: 99%

Rotation Intrinsic Spin Coupling: The Parallelism Description

Zhang

Беешам

2001

Mod. Phys. Lett. A

View full text Add to dashboard Cite

For the Dirac particle in the rotational system, the rotation induced inertia effect is analogously treated as the modification of the "spin connection" on the Dirac equation in the flat spacetime, which is determined by the equivalent tetrad. From the point of view of parallelism description of spacetime, the obtained torsion axial-vector is just the rotational angular velocity, which is included in the "spin connection". Furthermore the axial-vector spin coupling induced spin precession is just the rotation-spin(1/2) interaction predicted by Mashhoon. Our derivation treatment is straightforward and simplified in the geometrical meaning and physical conception, however the obtained conclusions are consistent with that of the other previous work.

show abstract

“…At this point we can say that such a torsion background is possible if one considers fer romagnetic crystals to design experiments with neutrons. Cosmological background torsion limit at the early Universe is given by < S >= 10 _19 s _1 For astrophysical limits the reader is referred also to recent literature [20,21].…”

Section: [[B}mentioning

confidence: 99%

“…Formula (20) allow us to compute the torsion tensor in terms of thermodynamical quantities. This allow us to build a model for thermodynamic in General Relativity with spin and Torsion.…”

Section: [[B}mentioning

confidence: 99%

Placing Limits on Cartan's Torsion From Non–riemannian Crystals

Andrade¹,

Garcia²

1996

Gravity, Particles and Space-Time

View full text Add to dashboard Cite

Plastic deformations in ferromagnetic substances obtained earlier by S.Amari [I] in terms of Finsler Geometry [2, 31 are obtained in terms of another kind of non-Riemannian geometry endowed with Cartan's torsion vector. Torsion vector is a fundamental concept for the comparison of both geometrical results apllied to the case of uniform magnetization. It is shown that the Cartan's torsion vector can be written as the gradient of the cosine directors of the magnetization direction. It is also shown that the torsion vector vanishes in the case of a Bloch wall of spins. An estimate for torsion in the case of Fe cubic crystals is given. This is a much higher-value than the ones obtained from Einstein-Cartan theory of gravitation. Thermal expansion of crystals can also be used to place a limit on Cartan's torsion.

show abstract

Is there evidence for torsion?

Cited by 14 publications

References 15 publications

Rotation Intrinsic Spin Effects and Its Astrophysical Application

Rotation Intrinsic Spin Effects and Its Astrophysical Application

Rotation Intrinsic Spin Coupling: The Parallelism Description

Placing Limits on Cartan's Torsion From Non–riemannian Crystals

Contact Info

Product

Resources

About