Massive vector particles tunneling from Kerr and Kerr-Newman black holes

In this paper, we investigate the Hawking radiation of massive spin-1 particles from 4-dimensional Kerr and Kerr-Newman black holes. By applying the Hamilton-Jacobi ansatz and the WKB approximation to the field equations of the massive bosons in Kerr and Kerr-Newman space-time, the quantum tunneling method is successfully implemented. As a result, we obtain the tunneling rate of the emitted vector particles and recover the standard Hawking temperature of both the two black holes.Comment: 14 pages, Acknowledgements added and typos corrected, Version accepted for publication in Physics Letters

Solar system tests for realistic f(T)f(T) models with nonminimal torsion-matter coupling

In the previous paper, we have constructed two $f(T)$ models with nonminimal torsion-matter coupling extension, which are successful in describing the evolution history of the Universe including the radiation-dominated era, the matter-dominated era, and the present accelerating expansion. Meantime, the significant advantage of these models is that they could avoid the cosmological constant problem of $\Lambda$CDM. However, the nonminimal coupling between matter and torsion will affect the tests of Solar system. In this paper, we study the effects of Solar system in these models, including the gravitation redshift, geodetic effect and perihelion preccesion. We find that Model I can pass all three of the Solar system tests. For Model II, the parameter is constrained by the measure of the perihelion precession of Mercury.Comment: 10 page

Assessing antibacterial property, UV protection, and thermal comfort of nanosilver treated cotton and polyester knit fabrics for sportswear

Although many studies have validated the antibacterial property of nanosilver treated fabrics (e.g. Paladini, De Simone, Sannino, & Pollini, 2014), few has been done on the assessment of UV protection property and/or thermal comfort. No study has been found assessing thermal comfort of nanosilver treated fabrics with human, clothing, and environment all taken into consideration. Hence, the purpose of this study was to introduce a dynamic numerical thermal model to assess the thermal comfort of nanosilver treated knit fabrics for sportswear. The antibacterial property and UV protection of the nanosilver treated knit fabrics were also evaluated