Results 21 to 30 of about 455,834 (341)

"Peeling property" for linearized gravity in null coordinates [PDF]

, 2001
A complete description of the linearized gravitational field on a flat background is given in terms of gauge-independent quasilocal quantities. This is an extension of the results from gr-qc/9801068.
Bardeen J M, Bondi H, Christodoulou D, Erdelyi A (ed), Friedlander F G, Friedlander F G, Jacek Jezierski, Jankowski A, Jezierski J, Jezierski J, Jezierski J, Jezierski J, Jezierski J, Klainerman S, Kroon J A V, Mino Y, Newman E T, Penrose R, van der Burg M G J   +18 more
core   +3 more sources

Study on Parameter Choice Methods for the RFMP with Respect to Downward Continuation

Frontiers in Applied Mathematics and Statistics, 2017
Recently, the regularized functional matching pursuit (RFMP) was introduced as a greedy algorithm for linear ill-posed inverse problems. This algorithm incorporates the Tikhonov-Phillips regularization which implies the necessity of a parameter choice ...
Martin Gutting, Bianca Kretz, Volker Michel, Roger Telschow   +3 more
doaj   +1 more source

Approximation of gravitational calculation based on analytical models

Geodesy and Cartography, 2022
Gravity meters can be used to measure all effects that make up the Earth’s gravity field. Many of these effects are caused by known sources such as the Earth’s rotation, distance from the Earth’s center, topographic relief, and tidal variation. Physical
Ashraf A. A. Beshr, Fawzi H. Zarzoura
doaj   +1 more source

Gravitational Shielding Effects in Gauge Theory of Gravity

, 2003
In 1992, E.E.Podkletnov and R.Nieminen find that, under certain conditions, ceramic superconductor with composite structure has revealed weak shielding properties against gravitational force. In classical Newton's theory of gravity and even in Einstein's
Wu, Ning
core   +1 more source

Gravitational Effects on the Neutrino Oscillation [PDF]

, 1996
The propagation of neutrinos in a gravitational field is studied. A method of calculating a covariant quantum-mechanical phase in a curved space-time is presented.
Bilenky, C. Giunti, C.W. Kim, Cardall, Fornengo, Giunti, J. Song, N. Fornengo, Piriz, Stodolsky   +9 more
core   +5 more sources

Mechanism of Gravity Impulse

, 2005
It is well-known that energy-momentum is the source of gravitational field. For a long time, it is generally believed that only stars with huge masses can generate strong gravitational field.
, A. Westphal, Albert Einstein, E. Podkletnov, E. Podkletnov, E. Podkletnov, Isaac Newton, Ning WU, Ning WU, Ning WU, Ning WU, Ning WU, Ning WU, Ning WU, Ning WU, Ning Wu, Ning WU, Ning WU, Ning WU, Ning WU, Ning WU, Ning WU, Ning WU, Ning WU, Ning WU, Ning Wu, Ning Wu, Ning WU, Wu Ning   +28 more
core   +1 more source

Vacua of the gravitational field [PDF]

, 2016
The Poincar\'e invariant vacuum is not unique in quantum gravity. The BMS supertranslation symmetry originally defined at null infinity is spontaneously broken and results in inequivalent Poincar\'e vacua.
Compère, Geoffrey, Long, Jiang
core   +1 more source

Theoretical research progress of gravitational field modeling in Earth science and deep-space exploration

地球与行星物理论评
Modeling the gravitational field of irregular celestial bodies is a common problem currently faced by the researchers in the fields of Earth science and deep space exploration.
Zhi Yin, Kefei Zhang, Yabo Duan, Junsheng Liu, Qinglu Mu   +4 more
doaj   +1 more source

Effective Potential for Quintessential Inflation Driven by Extrinsic Gravity

Universe, 2023
We numerically study the evolution of the extrinsic energy density in the context of an inflationary regime at the background level in a five-dimensional model using a Bayesian analysis from a dynamic nested sampler (DYNESTY) code.
Abraão J. S. Capistrano, Luís Antonio Cabral   +1 more
doaj   +1 more source

Constraining non-minimally coupled tachyon fields by Noether symmetry

, 2009
A model for a spatially flat homogeneous and isotropic Universe whose gravitational sources are a pressureless matter field and a tachyon field non-minimally coupled to the gravitational field is analyzed. Noether symmetry is used to find the expressions
Capozziello S, Capozziello S, Capozziello S, Capozziello S, Chimento L P, De Souza J C C, De Souza R C, Fiziev P P, Fukugita M, Gilberto M Kremer, Herrera R, Panotopoulos G, Ren J Meng X, Ribas M O, Riess A G, Riess A G, Rudinei C de Souza, Spalinski M, Srivastava S K   +18 more
core   +1 more source