Results 31 to 40 of about 130,273 (231)
On Killing vector fields and Newman–Penrose constants [PDF]
Journal of Mathematical Physics, 2000 Asymptotically flat space–times with one Killing vector field are studied. The Killing equations are solved asymptotically using polyhomogeneous expansions (i.e., series in powers of 1/r and ln r), and solved order by order. The solution to the leading terms of these expansions yields the asymptotic form of the Killing vector field.
openaire +3 more sources
Sufficient Conditions for Periodicity of a Killing Vector Field [PDF]
Proceedings of the American Mathematical Society, 1973 Let X X be a complete Killing vector field on an n n -dimensional connected Riemannian manifold. Our main purpose is to show that if X X has as few as n n closed orbits which are located properly with respect to each other, then X X must have periodic flow ...
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UNIT KILLING VECTOR FIELDS ON NEARLY KÄHLER MANIFOLDS [PDF]
International Journal of Mathematics, 2005 We study 6-dimensional nearly Kähler manifolds admitting a Killing vector field of unit length. In the compact case, it is shown that up to a finite cover there is only one geometry possible, that of the 3-symmetric space S3 × S3.
Moroianu, Andrei +2 more
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Global solutions in gravity [PDF]
, 1999 The method of conformal blocks for construction of global solutions in gravity for a two-dimensional metric having one Killing vector field is described.Comment: 4 pages, 2 figures, minor ...
Carter +10 more
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Bacteria‐Responsive Nanostructured Drug Delivery Systems for Targeted Antimicrobial Therapy
Advanced Materials, EarlyView.Bacteria‐responsive nanocarriers are designed to release antimicrobials only in the presence of infection‐specific cues. This selective activation ensures drug release precisely at the site of infection, avoiding premature or indiscriminate release, and enhancing efficacy.
Guillermo Landa +3 more
wiley +1 more source
Electron in higher-dimensional weakly charged rotating black hole spacetimes
, 2012 We demonstrate separability of the Dirac equation in weakly charged rotating black hole spacetimes in all dimensions. The electromagnetic field of the black hole is described by a test field approximation, with vector potential proportional to the ...
Cariglia, Marco +3 more
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Particle Number and 3D Schroedinger Holography [PDF]
, 2013 We define a class of space-times that we call asymptotically locally Schroedinger space-times. We consider these space-times in 3 dimensions, in which case they are also known as null warped AdS.
Hartong, Jelle, Rollier, Blaise
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Matrix Viscoelasticity Regulates Dendritic Cell Migration and Immune Priming
Advanced Materials, EarlyView.Matrix viscoelasticity is a key mechanical feature of the tumor microenvironment but remains poorly understood in immune regulation. Here, we develop a tunable collagen platform to decouple viscoelasticity from stiffness and show that slow‐relaxing matrices constrain dendritic cell migration by limiting actomyosin‐driven matrix remodeling, thereby ...
Wei‐Hung Jung +6 more
wiley +1 more source
Gauge conditions for binary black hole puncture data based on an approximate helical Killing vector
, 2003 We show that puncture data for quasicircular binary black hole orbits allow a special gauge choice that realizes some of the necessary conditions for the existence of an approximate helical Killing vector field.
A. Ashtekar +29 more
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Magnetically Actuated Drops‐on‐Stilts Microrobots for Transport and Delivery of Hydrophobic Cargo
Advanced Materials Interfaces, EarlyView.Iron oxide nanoparticles and oil droplets in external magnetic fields form “drops‐on‐stilts” microrobots that transport hydrophobic cargo. Tunable nanoparticle–droplet interactions generate stilt‐like structures. Field rotation enables walking, obstacle navigation, and collective motion.
Oluwafemi Ligan +9 more
wiley +1 more source