Results 31 to 40 of about 74,327 (228)

New constraints on data-closeness and needle map consistency for shape-from-shading [PDF]

, 1999
This paper makes two contributions to the problem of needle-map recovery using shape-from-shading. First, we provide a geometric update procedure which allows the image irradiance equation to be satisfied as a hard constraint.
Hancock, E R, Worthington, P L
core   +2 more sources

Some characterizations on critical metrics for quadratic curvature functions

Proceedings of the American Mathematical Society, 2017
Let \(\mathcal{M}_1(M^n)\) be the space of smooth Riemannian metrics of volume one on closed Riemannian manifold \(M^n\), \(n\geq 3\). It is well known that Einstein metrics are critical for the Einstein-Hilbert scalar curvature functional. Then, it is natural to study critical metrics which arise as solutions of the Euler-Lagrange equations for more ...
Huang, Guangyue, Chen, Li
openaire   +1 more source

FORMATION OF OPTIMAL PARAMETRS OF THE TRAJECTORY OF THE OVERFLIGHT OF UNMANNED AERIAL VEHICLE THROUGH THE SPECIFIED POINTS OF SPACE

Доклады Белорусского государственного университета информатики и радиоэлектроники, 2019
The purpose of the scientific research, results are determinated in the article, is to analytically synthesize the control law of an unmanned aerial vehicle while guiding one along the trajectory that specified by the reference points of space in an ...
A. A. Lobaty, A. Y. Bumai, Du Jun
doaj   +1 more source

Z_2-Regge versus Standard Regge Calculus in two dimensions [PDF]

, 1999
We consider two versions of quantum Regge calculus. The Standard Regge Calculus where the quadratic link lengths of the simplicial manifold vary continuously and the Z_2-Regge Model where they are restricted to two possible values.
A. Hauke, A. Jevicki, B. Berg, C. Holm, C. Holm, C. Holm, C. Holm, C. Holm, D. A. Johnston, E. Bittner, F. David, H. Hamber, H. Hamber, H. Hamber, H. Hamber, H. Hamber, H. Markum, H. W. Hamber, J. Ambjørn, J. Ambjørn, J. Ambjørn, J. B. Hartle, J. B. Hartle, J. Binney, J. Cheeger, J. Riedler, M. Gross, M. Roček, M. Roček, N. H. Christ, P. Homolka, P. Menotti, P. Menotti, P. Menotti, P. Menotti, P. Menotti, P. Menotti, S. Catterall, T. Fleming, T. Regge, V. Kazakov, V. Kazakov, V. Kazakov, V. Kazakov, V. Knizhnik, W. Beirl, W. Beirl, W. Beirl, W. Beirl, W. Beirl, W. Beirl, W. Janke   +51 more
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Structure Theory for Second Order 2D Superintegrable Systems with 1-Parameter Potentials

Symmetry, Integrability and Geometry: Methods and Applications, 2009
The structure theory for the quadratic algebra generated by first and second order constants of the motion for 2D second order superintegrable systems with nondegenerate (3-parameter) and or 2-parameter potentials is well understood, but the results for ...
Ernest G. Kalnins, Jonathan M. Kress, Willard Miller Jr., Sarah Post   +3 more
doaj   +1 more source

Nonlinear multidimensional cosmological models with form fields: stabilization of extra dimensions and the cosmological constant problem

, 2003
We consider multidimensional gravitational models with a nonlinear scalar curvature term and form fields in the action functional. In our scenario it is assumed that the higher dimensional spacetime undergoes a spontaneous compactification to a warped ...
A. Hindawi, A. Lukas, A. Lukas, A. Zhuk, B. Bajc, B. Whitt, C. Barcelo, C.D. Hoyle, C.P. Bachas, D. Wands, D.A. Demir, D.D. Sokolov, D.L. Wiltshire, E. Kiritsis, G. Dvali, G. Dvali, G. Dvali, G. Magnano, I. Antoniadis, J. Audretsch, J. Cline, J. Ellis, J. Garriga, J. Geddes, J. Gray, J. Polchinski, J. Schwarz, J.D. Barrow, J.D. Barrow, J.M. Cline, J.P. Duruisseu, K. Maeda, K. Maeda, L. Perivolaropoulos, L. Perivolaropoulos, L. Randall, L. Randall, L. Wang, M. Lachieze-Rey, M. Rainer, M.B. Green, N. Arkani-Hamed, N. Arkani-Hamed, N. Arkani-Hamed, N. Arkani-Hamed, N. Arkani-Hamed, P. Moniz, P.G.O. Freund, P.J.E. Peebles, R. Bean, R. Bean, R. Bean, R. Bousso, R. Kallosh, R. Kerner, R. Sundrum, R.R. Caldwell, S. Kachru, S. Nasri, S. Nojiri, S. Weinberg, S.M. Carroll, T. Banks, T.D. Saini, U. Günther, U. Günther, U. Günther, U. Günther, U. Günther, U. Günther, U. Günther, U. Günther, V. Sahni, V.A. Rubakov, V.D. Ivashchuk, V.D. Ivashchuk   +75 more
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Reconstruction of lensing from the cosmic microwave background polarization [PDF]

, 2003
Gravitational lensing of the cosmic microwave background (CMB) polarization field has been recognized as a potentially valuable probe of the cosmological density field.
Hirata, Christopher M., Seljak, Uros
core   +2 more sources

Critical metrics for quadratic functionals in the curvature on 4-dimensional manifolds

Differential Geometry and its Applications, 2011
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Euh, Yunhee, Park, JeongHyeong, Sekigawa, Kouei   +2 more
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Weighed scalar averaging in LTB dust models, part I: statistical fluctuations and gravitational entropy

, 2013
We introduce a weighed scalar average formalism ("q-average") for the study of the theoretical properties and the dynamics of spherically symmetric Lemaitre-Tolman-Bondi (LTB) dust models models.
Alexander S, Apostolopoulos P, Biswas T, Biswas T, Biswas T, Bolejko K, Bolejko K, Bondi H, Bonnor W B, Buchert T, Buchert T, Buchert T, Buchert T, Buchert T, Buchert T, Buchert T, Buchert T, Buchert T, Buchert T, Celerièr M N, Celerièr M N, Chuang C H, Clarkson C, Clarkson C, Dunsby P, Dwivedi I H, Dyer C C, Ellis G F R van Elst H, Enqvist K, February S, García-Bellido J, Gron O Hervik S, Hayward S A, Humphreys N P Maartens R Matravers D R, Kolb E, Kolb E W, Krasiński A, Lemaître G, Li N Buchert T Hosoya A Morita M Schwarz D J, Marozzi G, Marra V, Mattsson M, Mattsson M, Mattsson T, Mattsson T, Moffat J W, Paranjape A, Penrose R, Podurets M A, Rasanen S, Rasänen S, Roberto A Sussman, Roy X, Räsanen S, Schwarz D J, Sen N R, Sussman R A, Sussman R A, Sussman R A, Sussman R A, Sussman R A, Sussman R A, van Elst H, Wainwright J, Zalaletdinov R M McKellar R J   +64 more
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Four-dimensional homogeneous critical metrics for quadratic curvature functionals

Transactions of the American Mathematical Society
We determine all homogeneous metrics which are critical for some quadratic curvature functional in dimension four.
Brozos-Vázquez, Miguel, Caeiro-Oliveira, Sandro, Garcia-Rio, Eduardo, Vázquez-Lorenzo, Ramón   +3 more
openaire   +3 more sources