Results 61 to 70 of about 1,033,793 (200)

Model for gravity at large distances

, 2010
We construct an effective model for gravity of a central object at large scales. To leading order in the large radius expansion we find a cosmological constant, a Rindler acceleration, a term that sets the physical scales and subleading terms.
Grumiller, Daniel
core   +1 more source

POLISH AGRI-FOOD TRADE WITH NON-EU COUNTRIES – A GRAVITY MODEL ANALYSIS [PDF]

Annals of the Polish Association of Agricultural and Agribusiness Economists, 2019
The main aim of the article was to indicate the influence of selected determinants of Poland’s agri-food export to countries outside the European Union.
Agnieszka Sapa, Jolanta Droždz
doaj   +1 more source

Covariant Effective Action and One-Loop Renormalization of 2D Dilaton Gravity with Fermionic Matter

, 1993
Two dimensional dilaton gravity interacting with a four-fermion model and scalars is investigated, all the coefficients of the Lagrangian being arbitrary functions of the dilaton field.
A. Bilal, A. Chamseddine, A. Cooper, A.O. Barvinski, C. Callan, C. Teitelboim, C.G. Callan, D. Cangemi, D. Cangemi, D. Friedan, E. Elizalde, E. Elizalde, E. Elizalde, E. Elizalde, E. Fradkin, E. Hsu, E. Witten, F.D. Mazzitelli, G. 't Hooft, I.G. Avramidi, I.L. Buchbinder, I.M. Lichtzier, J. Polchinski, J.G. Russo, K. Hamada, L. Susskind, R. Jackiw, R. Kantowski, R. Mann, S. D. Odintsov, S. de Alwis, S. Giddings, S. Naftulin, S.D. Odintsov, S.D. Odintsov, S.D. Odintsov, T. Banks, T. Banks, T. Banks, T. Muta   +39 more
core   +1 more source

A New Combination Approach for Gibbs Phenomenon Suppression in Regional Validation of Global Gravity Field Model: A Case Study in North China

Remote Sensing
A global gravity field model (GGM) is essential to be validated with ground-based or airborne observational data for the accurate application of the GGM at a regional scale.
Yingchun Shen, Wei Feng, Meng Yang, Min Zhong, Wei Tian, Yuhao Xiong, Zhongshan Jiang   +6 more
doaj   +1 more source

PRAGMATIC APPROACH IN REGIONAL RAIL TRANSPORT PLANNING [PDF]

Scientific Journal of Silesian University of Technology. Series Transport, 2018
In the field of transport planning in the Czech Republic, there is increasing need not only for infrastructure planning, but also for public transport planning and creating operational concepts.
Vít JANOŠ, Milan KŘÍŽ
doaj   +1 more source

Arctan-Gravity Model [PDF]

Universe, 2015
A new gravity model with the function F(R) = (1/β) arctan (βR – β2R2) instead of the Ricci scalar in the Einstein–Hilbert action, describing inflation of the Universe, is suggested and analyzed. We obtain constant curvature solutions of the model in the Jordan frame. Performing the conformal transformation of the metric, the potential and the mass of a
openaire   +2 more sources

Atom Interferometry tests of the isotropy of post-Newtonian gravity

, 2007
We present a test of the local Lorentz invariance of post-Newtonian gravity by monitoring Earth's gravity with a Mach-Zehnder atom interferometer that features a resolution of about 8*10^(-9)g/Hz^(1/2), the highest reported thus far. Expressed within the
C. M. Will, D. Mattingly, Holger Müller, Keng-Yeow Chung, Sheng-wey Chiow, Steven Chu, Sven Herrmann, Y. Tamura   +7 more
core   +1 more source

Refining satellite Altimetry-Derived gravity anomaly model with shipborne gravity using multilayer perceptron neural networks

Scientific Reports
This study refines the gravity anomaly model derived from altimetry data by employing a multilayer perceptron (MLP) neural network to integrate multi-source geophysical data (longitude, latitude, gravity anomaly, geoid height, bathymetry, and sediment ...
Chengjun Xiao, Jinyun Guo, Chengcheng Zhu, Hui Li, Shangguo Liu, Xin Liu   +5 more
doaj   +1 more source

Synthetic Demand Flow Generation Using the Proximity Factor

Forecasting
One of the biggest challenges in designing a logistics network is predicting the demand flows between all pairs of points in the network. Currently, the gravity model is mainly used for estimating the demand flow between points.
Ekin Yalvac, Michael G. Kay
doaj   +1 more source

Starobinsky model in rainbow gravity [PDF]

Physical Review D, 2016
10 pages, 3 figures.
Chatrabhuti, Auttakit, Yingcharoenrat, Vicharit, Channuie, Phongpichit   +2 more
openaire   +2 more sources