| dc.contributor | Universidade Estadual Paulista (UNESP) | |
| dc.creator | Suzuki, A. T. | |
| dc.creator | Sales, J. H O | |
| dc.date | 2014-05-27T11:21:15Z | |
| dc.date | 2016-10-25T18:20:20Z | |
| dc.date | 2014-05-27T11:21:15Z | |
| dc.date | 2016-10-25T18:20:20Z | |
| dc.date | 2004-12-14 | |
| dc.date.accessioned | 2017-04-06T01:11:56Z | |
| dc.date.available | 2017-04-06T01:11:56Z | |
| dc.identifier | Modern Physics Letters A, v. 19, n. 38, p. 2831-2844, 2004. | |
| dc.identifier | 0217-7323 | |
| dc.identifier | http://hdl.handle.net/11449/68075 | |
| dc.identifier | http://acervodigital.unesp.br/handle/11449/68075 | |
| dc.identifier | 10.1142/S021773230401566X | |
| dc.identifier | 2-s2.0-11244287594 | |
| dc.identifier | http://dx.doi.org/10.1142/S021773230401566X | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/889457 | |
| dc.description | Gauge fields in the light front are traditionally addressed via, the employment of an algebraic condition n·A = 0 in the Lagrangian density, where Aμ is the gauge field (Abelian or non-Abelian) and nμ is the external, light-like, constant vector which defines the gauge proper. However, this condition though necessary is not sufficient to fix the gauge completely; there still remains a residual gauge freedom that must be addressed appropriately. To do this, we need to define the condition (n·A) (∂·A) = 0 with n·A = 0 = ∂·A. The implementation of this condition in the theory gives rise to a gauge boson propagator (in momentum space) leading to conspicuous nonlocal singularities of the type (k·n)-α where α = 1, 2. These singularities must be conveniently treated, and by convenient we mean not only mathemathically well-defined but physically sound and meaningful as well. In calculating such a propagator for one and two noncovariant gauge bosons those singularities demand from the outset the use of a prescription such as the Mandelstam-Leibbrandt (ML) one. We show that the implementation of the ML prescription does not remove certain pathologies associated with zero modes. However we present a causal, singularity-softening prescription and show how to keep causality from being broken without the zero mode nuisance and letting only the propagation of physical degrees of freedom. | |
| dc.language | eng | |
| dc.relation | Modern Physics Letters A | |
| dc.rights | info:eu-repo/semantics/closedAccess | |
| dc.subject | Light front | |
| dc.subject | Quantum gauge bosons | |
| dc.subject | Singularities in Feynman propagators | |
| dc.subject | boson | |
| dc.subject | calculation | |
| dc.subject | density | |
| dc.subject | electric field | |
| dc.subject | hardness | |
| dc.subject | light | |
| dc.subject | mathematics | |
| dc.subject | quantum chemistry | |
| dc.subject | sound | |
| dc.subject | space | |
| dc.subject | theory | |
| dc.title | Quantum gauge boson propagators in the light front | |
| dc.type | Otro | |
