669 research outputs found
Vector-Chiral Equivalence in Null Gauged WZNW Theory
We consider the standard vector and chiral gauged WZNW models by their gauged
maximal null subgroups and show that they can be mapped to each other by a
special transformation. We give an explicit expression for the map in the case
of the classical Lie groups , , , , and note its
connection with the duality map for the Riemmanian globally symmetric spaces.Comment: 13 pages, LaTe
Translational-invariant noncommutative gauge theory
A generalized translational invariant noncommutative field theory is analyzed
in detail, and a complete description of translational invariant noncommutative
structures is worked out. The relevant gauge theory is described, and the
planar and nonplanar axial anomalies are obtained.Comment: V1: 23 pages, 4 figures; V2: Section I. improved, References added.
Version accepted for publication in PR
Asymptotic Level State Density for Parabosonic Strings
Making use of some results concerning the theory of partitions, relevant in
number theory, the complete asymptotic behavior, for large , of the level
density of states for a parabosonic string is derived. It is also pointed out
the similarity between parabosonic strings and membranes.Comment: 9 pages , LaTe
Noncommutative SO(n) and Sp(n) Gauge Theories
We study the generalization of noncommutative gauge theories to the case of
orthogonal and symplectic groups. We find out that this is possible, since we
are allowed to define orthogonal and symplectic subgroups of noncommutative
unitary gauge transformations even though the gauge potentials and gauge
transformations are not valued in the orthogonal and symplectic subalgebras of
the Lie algebra of antihermitean matrices. Our construction relies on an
antiautomorphism of the basic noncommutative algebra of functions which
generalizes the charge conjugation operator of ordinary field theory. We show
that the corresponding noncommutative picture from low energy string theory is
obtained via orientifold projection in the presence of a non-trivial NSNS
B-field.Comment: 17 pages; considerations about fermions added and some minor change
Nutritional value of Jack knife clam Solen dactylus in the ripeness and sexual rest stages
In this study, 60 specimens of Jack knife clam Solen dactylus (Von Cosel, 1989) were collected randomly in autumn 2007 and spring 2008 from 5 stations (intertidal pools) in Golshahr coast of Bandar Abbas, Persian Gulf. After sampling, specimens were frozen and transferred to the laboratory for further biometric parameters measurements. The mean (±SD) anterior- posterior length in autumn and spring were 78.92±17.72 and 77.37±16.20mm, respectively. The mean (±SD) total weight was 9.53±4.88g in autumn and 8.43±4.46g in spring. Moisture, ash, protein and total lipid in soft tissues of clams were measured. These parameters in autumn and spring were 80.23 ± 0.70, 3.42±0.02, 11.3±0.10, 0.86±0.01% and 76.16±1.75, 2.3±0.07, 11.79±0.05, 0.55±0.02%, respectively. The values of moisture, ash and total lipid were higher in autumn (ripeness stage) compared to spring; whereas, the value of protein in autumn was slightly lower than spring. There was no significant difference between the mean of moisture before and after the spawning (P>0.05). The mean ash, protein and total lipid showed a significant difference in the two seasons (P<0.05)
BRST Quantization of Noncommutative Gauge Theories
In this paper, the BRST symmetry transformation is presented for the
noncommutative U(N) gauge theory. The nilpotency of the charge associated to
this symmetry is then proved. As a consequence for the space-like
non-commutativity parameter, the Hilbert space of physical states is determined
by the cohomology space of the BRST operator as in the commutative case.
Further, the unitarity of the S-matrix elements projected onto the subspace of
physical states is deduced.Comment: 20 pages, LaTeX, no figures, one reference added, to appear in Phys.
Rev.
Chiral anomalies in noncommutative gauge theories
Using cohomological methods we discuss several issues related to chiral
anomalies in noncommutative U(N) YM theories in any even dimension. We show
that for each dimension there is only one solution of the WZ consistency
condition and that there cannot be any reducible anomaly, nor any mixed anomaly
when the gauge group is a product group. We also clarify some puzzling aspects
of the issue of the anomaly when chiral fermions are in the adjoint
representation.Comment: 12 pages, Latex, typos and semantic ambiguities correcte
Gauge Invariant Cutoff QED
A hidden generalized gauge symmetry of a cutoff QED is used to show the
renormalizability of QED. In particular, it is shown that corresponding Ward
identities are valid all along the renormalization group flow. The exact
Renormalization Group flow equation corresponding to the effective action of a
cutoff lambda phi^4 theory is also derived. Generalization to any gauge group
is indicated.Comment: V1: 18 pages, 2 figures; V2: Discussions improved. Version accepted
for publication in Physica Script
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