Upper limit on the torsion coupling constant

Hammond, Richard T.

doi:10.1103/physrevd.52.6918

Cited by 56 publications

(52 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is easy to see that the bound (5.16) is incompatible with the one established in [95], because in this paper the torsion mass has been taken to be of the Planck order of magnitude. An additional restriction can be obtained from the analysis of the TEVATRON data but since they concern mainly the light torsion, we will not give the details here.…”

Section: Brief Review Of the Possible Torsion Effects In High-energy mentioning

confidence: 66%

“…After that, the same equation has been obtained in [95,170,120], and the derivation of higher order corrections through the Foldy-Wouthuysen transformation with torsion has been done in [159]. In [120] the Foldy-Wouthuysen transformation has been applied to derive Pauli equation.…”

Section: Generalized Pauli Equation With Torsionmentioning

confidence: 99%

“…In this case the effect of torsion is to provide the contact spinspin interactions. As an examples of works done in this direction one can mention [99] (one can find there more references) and [95], where the Pauli-like equation (4.6), (4.8) has been applied together with the Einstein-Cartan action for torsion. The most recent and complete upper bound for torsion parameters from the contact interactions have been obtained in [18].…”

Section: Experimental Constraints For the Constant Background Torsionmentioning

confidence: 99%

See 2 more Smart Citations

Physical aspects of the space–time torsion

2002

View full text Add to dashboard Cite

Abstract. We review many quantum aspects of torsion theory and discuss the possibility of the space-time torsion to exist and to be detected. The paper starts, in Chapter 2, with a pedagogical introduction to the classical gravity with torsion, that includes also interaction of torsion with matter fields. Special attention is paid to the conformal properties of the theory. In Chapter 3, the renormalization of quantum theory of matter fields and related topics, like renormalization group, effective potential and anomalies, are considered. Chapter 4 is devoted to the action of spinning and spinless particles in a space-time with torsion, and to the discussion of possible physical effects generated by the background torsion. In particular, we review the upper bounds for the magnitude of the background torsion which are known from the literature. In Chapter 5, the comprehensive study of the possibility of a theory for the propagating completely antisymmetric torsion field is presented. It is supposed that the propagating field should be quantized, and that its quantum effects must be described by, at least, some effective low-energy quantum field theory. We show, that the propagating torsion may be consistent with the principles of quantum theory only in the case when the torsion mass is much greater than the mass of the heaviest fermion coupled to torsion. Then, universality of the fermion-torsion interaction implies that torsion itself has a huge mass, and can not be observed in realistic experiments. Thus, the theory of quantum matter fields on the classical torsion background can be formulated in a consistent way, while the theory of dynamical torsion meets serious obstacles. In Chapter 6, we briefly discuss the string-induced torsion and the possibility to induce torsion action and torsion itself through the quantum effects of matter fields.

show abstract

Section: Brief Review Of the Possible Torsion Effects In High-energy mentioning

confidence: 66%

Section: Generalized Pauli Equation With Torsionmentioning

confidence: 99%

Section: Experimental Constraints For the Constant Background Torsionmentioning

confidence: 99%

See 1 more Smart Citation

Physical aspects of the space–time torsion

2002

View full text Add to dashboard Cite

show abstract

“…In the low energy limit, the Dirac equation yielded that same interaction as that predicted by the intrinsic vector approach, 7 and this was used to place an upper bound on the coupling constant. 8 In addition, it was shown that a scalar arises naturally, 9 and it was also shown that this scalar field might be interpreted as the scalar field of string theory. 10 Thus, the theory of gravitation with torsion with (1) adopts many characteristics of string theory -from the mirrored Lagrangian of the low energy string theory limit, to a source which must be at least one dimensional.…”

Section: Introductionmentioning

confidence: 99%

Strings in Gravity with Torsion

Hammond

2000

General Relativity and Gravitation

Self Cite

View full text Add to dashboard Cite

A theory of gravitation in 4D is presented with strings used in the material action in U 4 spacetime. It is shown that the string naturally gives rise to torsion. It is also shown that the equation of motion a string follows from the Bianchi identity, gives the identical result as the Noether conservation laws, and follows a geodesic only in the lowest order approximation. In addition, the conservation laws show that strings naturally have spin, which arises not from their motion but from their one dimensional structure.

show abstract

“…On the other hand, the direct interaction of torsion with fermionic matter fields has received considerable attention for a long time for purposes of formulating general relativity as a gauge theory [2,3,4,5]. In fact, torsion is the geometric object that relates spin of matter with the geometry of the space-time [6].…”

Section: Introductionmentioning

confidence: 99%