Zobrazeno 1 - 10
of 81
pro vyhledávání: '"Barrow, J. D."'
Autor:
Hu, J., Webb, J. K., Ayres, T. R., Bainbridge, M. B., Barrow, J. D., Barstow, M. A., Berengut, J. C., Carswell, R. F., Dumont, V., Dzuba, V., Flambaum, V. V., Lee, C. C., Reindl, N., Preval, S. P., Tchang-Brillet, W. -Ü. L.
The gravitational potential phi = GM/Rc^2 at the surface of the white dwarf G191-B2B is 10,000 times stronger than that at the Earth's surface. Numerous photospheric absorption features are detected, making this a suitable environment to test theorie
Externí odkaz:
http://arxiv.org/abs/2007.10905
Publikováno v:
Eur. Phys. J. C 79, 764 (2019)
We consider Friedmann-like universes with torsion and take a step towards studying their stability. In so doing, we apply dynamical-system techniques to an autonomous system of differential equations, which monitors the evolution of these models via
Externí odkaz:
http://arxiv.org/abs/1907.07586
Autor:
Preval, S. P., Barstow, M. A., Bainbridge, M., Reindl, N., Ayres, T., Holberg, J. B., Barrow, J. D., Lee, C. C., Webb, J. K., Hu, J.
Using newly obtained high-resolution data ($R\sim{1\times{10}^{5}}$) from the \textit{Hubble Space Telescope}, and archival UV data from the \textit{Far Ultraviolet Spectroscopic Explorer} we have conducted a detailed UV survey of the three hot, meta
Externí odkaz:
http://arxiv.org/abs/1905.12350
Autor:
Hu, J., Webb, J. K., Ayres, T. R., Bainbridge, M. B., Barrow, J. D., Barstow, M. A., Berengut, J. C., Carswell, R. F., Dzuba, V. A., Flambaum, V. V., Holberg, J. B., Lee, C. C., Preval, S. P., Reindl, N., Tchang-Brillet, W. -Ü L.
White dwarf atmospheres are subjected to gravitational potentials around $10^5$ times larger than occur on Earth. They provide a unique environment in which to search for any possible variation in fundamental physics in the presence of strong gravita
Externí odkaz:
http://arxiv.org/abs/1812.11480
We consider spatially homogeneous and isotropic cosmologies with non-zero torsion. Given the high symmetry of these universes, we adopt a specific form for the torsion tensor that preserves the homogeneity and isotropy of the spatial surfaces. Employ
Externí odkaz:
http://arxiv.org/abs/1809.10064
We investigate the dynamical features of a large family of running vacuum cosmologies for which $\Lambda$ evolves as a polynomial in the Hubble parameter. Specifically, using the critical point analysis we study the existence and the stability of sin
Externí odkaz:
http://arxiv.org/abs/1804.03656
Autor:
Preval, S. P., Barstow, M. A., Holberg, J. B., Barrow, J. D., Berengut, J. C., Webb, J. K., Dougan, D., Hu, J.
Recently, white dwarf stars have found a new use in the fundamental physics community. Many prospective theories of the fundamental interactions of Nature allow traditional constants, like the fine structure constant $\alpha$, to vary in some way. A
Externí odkaz:
http://arxiv.org/abs/1410.0809
Publikováno v:
Phys.Rev.D86:107302,2012
The detection of magnetic fields at high redshifts, and in empty intergalactic space, support the idea that cosmic magnetism has a primordial origin. Assuming that Maxwellian electromagnetism and general relativity hold, and without introducing any `
Externí odkaz:
http://arxiv.org/abs/1210.1183
Publikováno v:
Phys.Rev.D86:023533,2012
Cosmological magnetic fields in open Friedmann universes can experience superadiabatic amplification within the realm of conventional electromagnetism. This is possible mathematically, despite the conformal invariance of Maxwell's equations, because
Externí odkaz:
http://arxiv.org/abs/1205.6662
Publikováno v:
Phys. Rev. D 84, 123518 (2011)
We solve the Klein-Gordon equation for a massive, non-minimally coupled scalar field, with a conformal coupling, undergoing cosmological evolution from a radiation-dominated phase to a future sudden singularity. We show that, after regularisation, th
Externí odkaz:
http://arxiv.org/abs/1110.1321