Results 11 to 20 of about 4,769 (119)

Ruled real hypersurfaces of complex space forms

Kodai Mathematical Journal, 2010
Real hypersurfaces in non-flat complex space forms with integrable holomorphic distribution and symmetric φ-Ricci tensor which are φ-Einstein are ruled real hypersurfaces.
Hamada, Tatsuyoshi, Inoguchi, Jun-ichi
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On ruled real hypersurfaces in a complex space form

Tsukuba Journal of Mathematics, 1993
A real hypersurface \(M\) of a complex space form \(N\) is said to be ruled if \(M\) is foliated by one-codimensional totally geodesic complex submanifolds of \(N\). The authors provide a sufficient condition for a real hypersurface in a non-flat complex space form to be ruled.
Ahn, Seong-Soo, Lee, Sung-Baik, Suh, Young-Jin   +2 more
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Is "the theory of everything'' merely the ultimate ensemble theory? [PDF]

, 1998
We discuss some physical consequences of what might be called ``the ultimate ensemble theory'', where not only worlds corresponding to say different sets of initial data or different physical constants are considered equally real, but also worlds ruled ...
Albrecht, Asgeirsson, Balashov, Barrow, Barrow, Barrow, Barrow, Büchel, Carr, Carter, Chaitin, Coleman, Courant, Curry, Davies, Davies, Davies, Deser, Deutsch, Dorling, Eddington, Ehrenfest, Ehrenfest, Everett III, Feinberg, Freeman, Goodstein, Greenstein, Hawking, Hawking, Hilbert, Hoyle, Linde, Linde, Max Tegmark, Misner, Nielsen, Nielsen, Nozick, Penrose, Poincaré, Press, Robinson, Rucker, Schrödinger, Solomonoff, Tangherlini, Tegmark, Tegmark, Tegmark, Tipler, Vilenkin, Weinberg, Weinberg, Weyl, Wheeler, Wheeler, Whitrow, Wigner, Zeh, Zurek   +60 more
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Twistor representation of null two-surfaces [PDF]

, 2001
We present a twistor description for null two-surfaces (null strings) in 4D Minkowski space-time. The Lagrangian density for a variational principle is taken as a surface-forming null bivector.
Ashtekar, Bandos, Barbashov, Bengtsson, Brink, Brink, Dabrowski, Dreyer, Feber, Frittelli, Gusev, Ilienko, Kar, Kossowski, Kostyantin Ilyenko, Lousto, Mukhopadhyay, Newman, Penrose, Schild, Shirafuji, Soroka, Stachel, Volkov, Zheltukhin, Zheltukhin, Zheltukhin   +26 more
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Ruled real hypersurfaces having the same sectional curvature as that of an ambient nonflat complex space form [PDF]

Kodai Mathematical Journal, 2016
Ruled real hypersurfaces in a nonflat complex space form $\tilde{M}_n(c) (n ≧ 2)$ are obtained by having a one-codimensional foliation whose leaves are totally geodesic complex hypersurfaces of the ambient space. Motivated by a fact that the sectional curvature $K$ of every ruled real hypersurface $M$ in $\tilde{M}_n(c) (n ≧ 3)$ satisfies $|c/4| ≦ |K(X,
Maeda, Sadahiro, Tanabe, Hiromasa, Kim, Young Ho   +2 more
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Weak Minimal Area In Entanglement Entropy [PDF]

, 2015
We re-visit the minimal area condition of Ryu-Takayanagi in the holographic calculation of the entanglement entropy. In particular, the Legendre test and the Jacobi test.
Pal, Shesansu Sekhar, Rath, Shubhalaxmi
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On geometry of hypersurfaces of a pseudoconformal space of Lorentzian signature

, 1998
There are three types of hypersurfaces in a pseudoconformal space C^n_1 of Lorentzian signature: spacelike, timelike, and lightlike. These three types of hypersurfaces are considered in parallel.
Akivis, Akivis, Akivis, Beem, Chandrasekhar, Duggal, Klein, Klein, Kossowski, M.A. Akivis, O'Neill, Schiemankgk, V.V. Goldberg   +12 more
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Sectional curvatures of ruled real hypersurfaces in a complex hyperbolic space

Differential Geometry and its Applications, 2017
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Maeda, Sadahiro, Tanabe, Hiromasa
openaire   +1 more source

Quantization of Contact Manifolds and Thermodynamics

, 2007
The physical variables of classical thermodynamics occur in conjugate pairs such as pressure/volume, entropy/temperature, chemical potential/particle number.
Arnold, Arnold, Blair, Buchdahl, Connes, Connes, Courant, Gilmore, Lieb, Roulstone, S.G. Rajeev, Thurston, W Gibbs, Weinstein, Witten   +14 more
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Relative Ruan and Gromov-Taubes Invariants of Symplectic 4-Manifolds

, 2013
We define relative Ruan invariants that count embedded connected symplectic submanifolds which contact a fixed stable symplectic hypersurface V in a symplectic 4-manifold (X,w) at prescribed points with prescribed contact orders (in addition to ...
Fintushel R., Jabuka S., JOSEF G. DORFMEISTER, Lee J., Li J., Li T.-J., McDuff D., Pjateckiĭ-Šapiro I. I., TIAN-JUN LI   +8 more
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