Zobrazeno 1 - 10
of 141
pro vyhledávání: '"Dubovsky, S L"'
Publikováno v:
Phys. Rev. D 88, 117701 (2013)
We revisit cosmic microwave background (CMB) constraints on the abundance of millicharged particles based on the Planck data. The stringent limit Omega_{mcp}h^2 < 0.001 (95% CL) may be set using the CMB data alone if millicharged particles participat
Externí odkaz:
http://arxiv.org/abs/1310.2376
Autor:
Dubovsky, S. L., Sibiryakov, S. M.
Publikováno v:
Phys.Lett.B638:509-514,2006
We study the effect of spontaneous breaking of Lorentz invariance on black hole thermodynamics. We consider a scenario where Lorentz symmetry breaking manifests itself by the difference of maximal velocities attainable by particles of different speci
Externí odkaz:
http://arxiv.org/abs/hep-th/0603158
Publikováno v:
Phys.Rev.Lett. 94 (2005) 181102
We construct a consistent model of gravity where the tensor graviton mode is massive, while linearized equations for scalar and vector metric perturbations are not modified. The Friedmann equation acquires an extra dark-energy component leading to ac
Externí odkaz:
http://arxiv.org/abs/hep-th/0411158
Autor:
Dubovsky, S. L.
Publikováno v:
JHEP0410:076,2004
We systematically study the most general Lorentz-violating graviton mass invariant under three-dimensional Eucledian group using the explicitly covariant language. We find that at general values of mass parameters the massive graviton has six propaga
Externí odkaz:
http://arxiv.org/abs/hep-th/0409124
Autor:
Dubovsky, S. L.
Publikováno v:
JCAP 0407 (2004) 009
We consider the infrared modification of gravity by ghost condensate. Naively, in this scenario one expects sizeable modification of gravity at distances of order 1000 km, provided that the characteristic time scale of the theory is of the order of t
Externí odkaz:
http://arxiv.org/abs/hep-ph/0403308
Autor:
Dubovsky, S. L., Sibiryakov, S. M.
Publikováno v:
Nucl.Phys. B691 (2004) 91-110
Noncommutative U(N) gauge theories at different N may be often thought of as different sectors of a single theory. For instance, U(1) theory possesses a sequence of vacua labeled by an integer parameter N, and the theory in the vicinity of the N-th v
Externí odkaz:
http://arxiv.org/abs/hep-th/0401046
Publikováno v:
JETP Lett. 79 (2004) 1-5; Pisma Zh.Eksp.Teor.Fiz. 79 (2004) 3-7
We calculate the cosmic microwave background (CMB) anisotropy spectrum in models with millicharged particles of electric charge q\sim 10^{-6}-10^{-1} in units of electron charge. We find that a large region of the parameter space for the millicharged
Externí odkaz:
http://arxiv.org/abs/hep-ph/0311189
Autor:
Dubovsky, S. L., Libanov, M. V.
Publikováno v:
JHEP 0311 (2003) 038
We study whether modification of gravity at large distances is possible in warped backgrounds with two branes and a brane-induced term localized on one of the branes. We find that there are three large regions in the parameter space where the theory
Externí odkaz:
http://arxiv.org/abs/hep-th/0309131
Autor:
Dubovsky, S. L., Sibiryakov, S. M.
Publikováno v:
Nucl.Phys. B664 (2003) 407-438
Noncommutative U(N) gauge theories at different N may be often thought of as different sectors of a single theory: the U(1) theory possesses a sequence of vacua labeled by an integer parameter N, and the theory in the vicinity of the N-th vacuum coin
Externí odkaz:
http://arxiv.org/abs/hep-th/0303233
Publikováno v:
Theor.Math.Phys. 138 (2004) 269-283; Teor.Mat.Fiz. 138 (2004) 319-337
We generalize to noncommutative cylinder the solution generation technique, originally suggested for gauge theories on noncommutative plane. For this purpose we construct partial isometry operators and complete set of orthogonal projectors in the alg
Externí odkaz:
http://arxiv.org/abs/hep-th/0301047