Letter: Gödel-Type Space-Time Metrics
نویسندگان
چکیده
منابع مشابه
Outline Introduction : Gödel ’ s letter Time and space complexity
complexity Reductions, hardness, completeness Projections, provers and verifiers Complexity 3: Feasibility Dusko Pavlovic Introduction Time and space Abstract complexity Reducibility P vs NP Outline Introduction: Gödel’s letter Time and space complexity
متن کاملEnergy Distribution of a Gödel - Type Space - Time Ragab
We calculate the energy and momentum distributions associated with a Gödel-type space-time, using the well-known energy-momentum complexes of Landau and Lifshitz and Møller. We show that the definitions of Landau and Lifshitz and Møller do not furnish a consistent result.
متن کاملH-type Riemannian Metrics on the Space of Planar Curves
Michor and Mumford have shown that the distances between planar curves in the simplest metric (not involving derivatives) are identically zero. We derive geodesic equations and a formula for sectional curvature for conformally equivalent metrics. We show if the conformal factor depends only on the length of the curve, the metric behaves like an L metric, the sectional curvature is not bounded f...
متن کاملProperties of Sobolev–type metrics in the space of curves
We define a manifold M where objects c ∈ M are curves, which we parameterize as c : S → lR (n ≥ 2, S is the circle). We study geometries on the manifold of curves, provided by Sobolev–type Riemannian metrics H . These metrics have been shown to regularize gradient flows used in Computer Vision applications, see [13, 16] and references therein. We provide some basic results of H metrics; and, fo...
متن کاملCode design metrics for space-time systems under arbitrary fading
This paper presents a worst-case pairwise codeword error probability analysis, under arbitrary block fading, for wireless communication systems with multiple transmit and receive antennas. Our results generalize the Rayleigh-fading space-time code design criteria (full rank and maximum determinant) to arbitrary fading. Keywords— Space-time codes, multiple transmit antennas, product distance.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: General Relativity and Gravitation
سال: 2003
ISSN: 0001-7701,1572-9532
DOI: 10.1023/a:1026022416126