منابع مشابه
Nonstandard optics from quantum spacetime
We study light propagation in the picture of semi-classical space-time that emerges in canonical quantum gravity in the loop representation. In such picture, where space-time exhibits a polymerlike structure at microscales, it is natural to expect departures from the perfect non-dispersiveness of ordinary vacuum. We evaluate these departures, computing the modi cations to Maxwell's equations du...
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The first light detected from a relativistic region about a black hole was discovered by the ASCA satellite by Tanaka et al. (1995); Yaqoob et al. (1998). The now accepted theoretical model describing the broad X-ray emission lines is that of an accretion disk around either a Kerr or a Schwarzscild black hole (Laor 1991; Reynolds et al. 1995; Turner, George, Nandra, & Mushotzky 1997; Nandra et ...
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In their recent paper [8], Kulharni and Raymond show that a closed 3-manifold which admits a complete Lorentz metric of constant curvature 1 (henceforth called a complete Lorentz structure) must be Seifert fibered over a hyperbolic base. Furthermore on every such Seifert fibered 3-manifold with nonzero Euler class they construct such a Lorentz metric. Moreover the Lorentz structure they constru...
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Let k be a field of char(k) 6= 2, and suppose that q ∈ k is not a root of unity. The associated quantum plane [5, §IV.1], denoted by kq[x, y], is defined to be the free k-algebra k{x, y} generated by x and y, modulo the relation yx = qxy. The set of monomials {xy}i, j≥0 is a basis for the underlying k-vector space, and for every pair (i, j) of nonnegative integers, we have yx = qxy . There is a...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1999
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.59.124021