Results 11 to 20 of about 92,362 (201)

Dynamical laws of superenergy in General Relativity

, 2007
The Bel and Bel-Robinson tensors were introduced nearly fifty years ago in an attempt to generalize to gravitation the energy-momentum tensor of electromagnetism.
Alfonso García-Parrado Gómez-Lobo, Anderson A, Bel L, Bel L, Bel L, Bel L, Bergqvist G, Bergqvist G, Bergqvist G, Chevreton M, Ellis G F R, Eriksson I, Eriksson I, Hawking S W, Herrera L, Herrera L, Jackson D, Klainerman S, Lazkoz R, Maartens R, Martín-García J M, Mashoon B, Naber G L, Penrose R, Penrose R Rindler W, Senovilla J M M, Senovilla J M M, Stephani H, Szabados L, Thorne K S   +29 more
core   +1 more source

Intrinsic alignments of galaxies in the MassiveBlack-II simulation: analysis of two-point statistics [PDF]

, 2015
The intrinsic alignment of galaxies with the large-scale density field is an important astrophysical contaminant in upcoming weak lensing surveys. We present detailed measurements of the galaxy intrinsic alignments and associated ellipticity-direction ...
Di Matteo, Tiziana, Feng, Yu, Khandai, Nishikanta, Mandelbaum, Rachel, Singh, Sukhdeep, Tenneti, Ananth   +5 more
core   +1 more source

Canonical Quasilocal Energy and Small Spheres [PDF]

, 1998
Consider the definition E of quasilocal energy stemming from the Hamilton-Jacobi method as applied to the canonical form of the gravitational action. We examine E in the standard "small-sphere limit," first considered by Horowitz and Schmidt in their ...
Brown, J. D., Lau, S. R., York, J. W.
core   +4 more sources

CT-duality as a local property of the world-sheet

, 2005
In the present article, we study the local features of the world-sheet in the case when probe bosonic string moves in antisymmetric background field. We generalize the geometry of surfaces embedded in space-time to the case when the torsion is present ...
B. SAZDOVIĆ, Banks T., Callan C. G.
core   +2 more sources

On Two Kinds of Differential Operators on General Smooth Surfaces [PDF]

, 2013
Two kinds of differential operators that can be generally defined on an arbitrary smooth surface in a finite dimensional Euclid space are studied, one is termed as surface gradient and the other one as Levi-Civita gradient.
Xie, Xi-Lin
core  

Geometry of crossing null shells

, 2003
New geometric objects on null thin layers are introduced and their importance for crossing null-like shells are discussed. The Barrab\`es--Israel equations are represented in a new geometric form and they split into decoupled system of equations for two ...
Ashtekar, Barrabès, Belinfante, Belinfante, Dirac, Dray, Hájı́ček, Hájı́ček, Hájı́ček, Hájı́ček, Hájı́ček, Hájı́ček, Hájı́ček, Israel, Israel, Jacek Jezierski, Jezierski, Jezierski, Kijowski, Kijowski, Kijowski, Kijowski, Kouletsis, Louko, Magli, Mars, Raychaudhuri, Redmount, Taub   +28 more
core   +2 more sources

Diffusion‐based size determination of solute particles: a method adapted for postsynaptic proteins

FEBS Open Bio, EarlyView.
We present a diffusion‐based approach for measuring the size of macromolecules and their complexes, and demonstrate its use on postsynaptic proteins. The method requires fluorescein‐labelled protein samples, a microfluidic device that maintains laminar flow for said samples, a microscope recording the emitted fluorescent signals, and an analytic ...
András László Szabó, Eszter Nagy‐Kanta, Soma Varga, Edit Andrea Jáger, Csaba István Pongor, Mária Laki, András József Laki, Zoltán Gáspári   +7 more
wiley   +1 more source

An intrinsic characterization of 2+2 warped spacetimes

, 2010
We give several equivalent conditions that characterize the 2+2 warped spacetimes: imposing the existence of a Killing-Yano tensor $A$ subject to complementary algebraic restrictions; in terms of the projector $v$ (or of the canonical 2-form $U ...
Bianchi L, Carot J, Carot J, Cartan E, Cotton É, Ferrando J J, Ferrando J J, Ferrando J J, Ferrando J J, Ferrando J J, Ferrando J J, Ferrando J J, Ferrando J J Sáez J A, Ferrando J J Sáez J A, Haddow B, Joan Josep Ferrando, Juan Antonio Sáez, Minguzzi E, O'Neill B, Rainich G Y, Raposo A P, Riemann B, Takeno H   +22 more
core   +2 more sources

How Fluids Bend: the Elastic Expansion for Higher-Dimensional Black Holes [PDF]

, 2013
Hydrodynamics can be consistently formulated on surfaces of arbitrary co-dimension in a background space-time, providing the effective theory describing long-wavelength perturbations of black branes. When the co-dimension is non-zero, the system acquires
Armas, Jay
core   +2 more sources

Bistable Mechanisms 3D Printing for Mechanically Programmable Vibration Control

Advanced Engineering Materials, EarlyView.
This work introduces a 3D‐printed bistable mechanism integrated into tuned mass dampers (TMDs) for mechanically adaptive passive vibration suppression. Through optimized geometry, the bistable design provides adaptable vibration reduction across a broad range of scenarios, achieving effective vibration mitigation without complex controls or external ...
Ali Zolfagharian, Frédéric Demoly, Mohammad Lakhi, Bernard Rolfe, Mahdi Bodaghi   +4 more
wiley   +1 more source