Axion Mass Bound in Very Special Relativity

In this paper we propose a very special relativity (VSR)-inspired description of the axion electrodynamics. This proposal is based upon the construction of a proper study of the SIM$(2)$--VSR gauge-symmetry. It is shown that the VSR nonlocal effects give a health departure from the usual axion field theory. The axionic classical dynamics is analysed in full detail, first by a discussion of its solution in the presence of an external magnetic field. Next, we compute photon-axion transition in VSR scenario by means of Primakoff interaction, showing the change of a linearly polarized light to a circular one. Afterwards, duality symmetry is discussed in the VSR framework.Comment: 16 pages; to appear in PL

Field dependent nilpotent symmetry for gauge theories

We construct the field dependent mixed BRST (combination of BRST and anti-BRST) transformations for pure gauge theories. These are shown to be an exact nilpotent symmetry of both the effective action as well as the generating functional for certain choices of the field dependent parameters. We show that the Jacobian contributions for path integral measure in the definition of generating functional arising from BRST and anti-BRST part compensate each other. The field dependent mixed BRST transformations are also considered in field/antifield formulation to show that the solutions of quantum master equation remain invariant under these. Our results are supported by several explicit examples.Comment: 25 pages, No figures, Revte

BRST Quantization of Unimodular Gravity

We study the quantization of two versions of unimodular gravity, namely fully diffeomorphism-invariant unimodular gravity and unimodular gravity with fixed metric determinant, utilizing standard path integral approach. We derive the BRST symmetry of effective actions corresponding to several relevant gauge conditions. We observe that for some gauge conditions, the restricted gauge structure may complicate the formulation and effective actions, in particular, if the chosen gauge conditions involve the canonical momentum conjugate to the induced metric on the spatial hypersurface. The BRST symmetry is extended further to the finite field-dependent BRST transformation, in order to establish the mapping between different gauge conditions in each of the two versions of unimodular gravity.Peer reviewe

Quantum gravity effects on Ho\v{r}ava-Lifshitz black hole

In this paper, we would like to obtain quantum gravity effects by using Ho\v{r}ava-Lifshitz black hole. We consider logarithmic corrected thermodynamics quantities and investigate the effects of logarithmic correction term. Logarithmic correction comes from thermal fluctuation and may be interpreted as quantum loop corrections. As black hole is a gravitational system, hence we can investigate quantum gravity effect. We find such effects on the black hole stability and obtain domain of correction coefficient.Comment: 22 pages, Accepted for publication in NP

Effects of roughing, finishing, and aggressive machining conditions on the milling performance of AISI 1045 steel using TiAlN coated inserts

The objective of the present study is to develop a better understanding of machining performance of TiAlN coated tools during face milling of AISI 1045 medium carbon steel. The influences of three different cutting conditions (roughing, finishing, and aggressive conditions) were investigated on cutting forces, chip temperature, tool wear, surface roughness, and chip characteristics. The highest cutting forces were obtained under roughing condition, while, aggressive mode of machining (high values of cutting speed, feed, and depth of cuts) resulted in the highest chip temperature, crater, and flank wear. Material adhesion and coating delamination were predominant under roughing condition. On the other hand, aggressive condition exhibited diffusion wear causing large depth of crater and severe thermal cracks leading to fracture of the cutting edge. Attrition and abrasion wear were also evident. The results of cutting forces, chip temperature, surface roughness, and chip characteristics were correlated with those of tool wear. Results were found to be beneficial in recommending appropriate criteria for choosing different cutting conditions in face milling of AISI 1045 steel using TiAlN coated insert.info:eu-repo/semantics/publishedVersio

Antimicrobial activity of photo-activated cow urine against certain pathogenic bacterial strains

In the present investigation binary combination of photo activated and it binary combinations was determined against seven bacterial strains. Photoactivated cow urine has shown MIC value 0.25 ml/ml MIC value against Staphylococcus aureus (ATCC 25923), Bacillus cereus (ATCC 11778), Lactobacillus acidophilus (ATCC 53103 and Micrococcus luteus (ATCC 9341), while it was found 0.125 ml/ml against E. coli (ATCC 25922). Binnary combinations of cow urine with Neem and Bavchi oil has shown synergistic effect as the MIC value obtained was 0.125-0.25 ml/ml. Similarly photoactivated cow urine has shown least MBC value that is, 0.25-1.0 ml/ml. Further, growth inhibition zone diameters obtained in presence of photoactivated cow urine and its binary combinations were found much larger than antibiotic drugs. Neem oil has shown highest inhibition zone diameter that is, 45 mm against S. pneumoniae. Neem oiland cow urine have shown 33 to 35 mm inhibition zone diameter against B. cereus, L. acidophilus, Micrococcus. Luteus, K. pneumoniae and S. pneumoniae, while Bawchi oil and cow urine combination has shown high diameter inhibition zone diameter that is 41 mm against K. pnumoniae. Photoactivated cow urine has shown 32 to 36 mm inhibition zone diameter homogeneously against all bacterial strains. It proves very high antimicrobial susceptibility of cow urine and essential oils