Results 51 to 60 of about 250,232 (209)

Visible Shapes of Black Holes M87* and SgrA*

Universe, 2020
We review the physical origins for possible visible images of the supermassive black hole M87* in the galaxy M87 and SgrA* in the Milky Way Galaxy. The classical dark black hole shadow of the maximal size is visible in the case of luminous background ...
Vyacheslav I. Dokuchaev, Natalia O. Nazarova   +1 more
doaj   +1 more source

Investigation of some galactic and extragalactic gravitational phenomena [PDF]

Serbian Astronomical Journal, 2012
Here we present a short overview of the most important results of our investigations of the following galactic and extragalactic gravitational phenomena: supermassive black holes in centers of galaxies and quasars, supermassive black hole ...
Jovanović P.
doaj   +1 more source

Possible Alterations of Local Gravitational Field Inside a Superconductor

Entropy, 2021
We calculate the possible interaction between a superconductor and the static Earth’s gravitational fields, making use of the gravito-Maxwell formalism combined with the time-dependent Ginzburg–Landau theory.
Giovanni Alberto Ummarino, Antonio Gallerati   +1 more
doaj   +1 more source

Gravitation and Nonlocality [PDF]

, 2001
The physical basis of the standard theory of general relativity is examined and a nonlocal theory of accelerated observers is described that involves a natural generalization of the hypothesis of locality.
Mashhoon, Bahram
core   +1 more source

The Interaction of Quantum Gravity with Matter

, 2010
The interaction of (linearized) gravitation with matter is studied in the causal approach up to the second order of perturbation theory. We consider the generic case and prove that gravitation is universal in the sense that the existence of the ...
Bogoliubov N N, D R Grigore, Dütsch M Gracia-Bondía J M Scheck F Varilly J C, Epstein H, Glaser V, Grigore D R, Grigore D R, Grigore D R, Grigore D R, Grigore D R, Grigore D R, Grigore D R, Grigore D R Scharf G, Grigore D R Scharf G, Jost R, Popineau G Stora R, Scharf G, Scharf G, Scharf G, Steinmann O, Stora R, Streater R F, Weinberg S, Wightman A S   +23 more
core   +1 more source

Extremal Cosmological Black Holes in Horndeski Gravity and the Anti-Evaporation Regime

Universe, 2020
Extremal cosmological black holes are analysed in the framework of the most general second order scalar-tensor theory, the so-called Horndeski gravity.
Ismael Ayuso, Diego Sáez-Chillón Gómez   +1 more
doaj   +1 more source

Hořava–Lifshitz $F\left(\overline{R}\right)$ Theories and the Swampland

Universe, 2023
The compatibility between the de Sitter Swampland conjecture and Hořava–Lifshitz F(R¯) theories with a flat FLRW metric is studied. We first study the standard f(R) theories and show that the only way in which the dS conjecture can be made independent of
Hugo García-Compeán, Daniel Mata-Pacheco, Luis Zapata   +2 more
doaj   +1 more source

Mie's Theories of Matter and Gravitation [PDF]

, 2007
Unifying physics by describing a variety of interactions – or even all interactions – within a common framework has long been an alluring goal for physicists. One of the most ambitious attempts at unification was made in the 1910s by Gustav Mie.
Smeenk, Chris
core  

Gravitation and Duality Symmetry

, 2005
By generalizing the Hodge dual operator to the case of soldered bundles, and working in the context of the teleparallel equivalent of general relativity, an analysis of the duality symmetry in gravitation is performed.
A. L. BARBOSA, Ashtekar A., de Andrade V. C., de Andrade V. C., Deser S., Hayashi K., Henneaux M., J. G. PEREIRA, Kobayashi S., Konopleva N. P., V. C. DE ANDRADE, Weitzenböck R.   +11 more
core   +1 more source

Routing in multi-sink sensor networks based on gravitation field

Tongxin xuebao, 2008
The process of data forwarding in sensor networks was analogy to electric charge moving in electrostatic field. By this analogy, a method which abstracted a sensor networks to a Gravitation Field was proposed.
doaj   +2 more sources