Results 41 to 50 of about 1,033,793 (200)

Matrix model formulation of four dimensional gravity [PDF]

, 2000
The attempt of extending to higher dimensions the matrix model formulation of two-dimensional quantum gravity leads to the consideration of higher rank tensor models.
Ambjorn, Barrett, Boulatov, Boulatov, De Pietri, De Pietri, Ooguri, Ponzano, Roberto De Pietri   +8 more
core   +3 more sources

SDUST2023GRA_MSS: the new global marine gravity anomaly model determined from mean sea surface model

Scientific Data
The global marine gravity anomalies are primarily recovered from geoid gradients in the along-track directions obtained through satellite altimetry. However, the accuracy of the gravity model is significantly constrained by the sparse geoid gradients in ...
Jinyun Guo, Xuyang Wei, Zhen Li, Yongjun Jia, Xiaotao Chang, Xin Liu   +5 more
doaj   +1 more source

The Uganda Gravimetric Geoid Model 2014 Computed by The KTH Method

Journal of Geodetic Science, 2015
For many developing countries such as Uganda, precise gravimetric geoid determination is hindered by the low quantity and quality of the terrestrial gravity data.
Sjöberg L. E., Gidudu A., Ssengendo R.
doaj   +1 more source

Some interesting features of new massive gravity

, 2011
A proof that new massive gravity - the massive 3D gravity model proposed by Bergshoeff, Hohm and Townsend (BHT) - is the only unitary system at the tree level that can be constructed by augmenting planar gravity through the curvature-squared terms, is ...
Andringa R, Antonio Accioly, Bergshoeff E, Bergshoeff E, Bergshoeff E, Bergshoeff E Hohm O Townsend P, Bruno Pereira-Dias, Dalmazi D, de Rham C, Deser S, Eslley Scatena, Jefferson Morais, José Helayël-Neto, Rodrigo Turcati, Staruszkiewicz A, Teyssandier P, ’t Hooft G   +16 more
core   +1 more source

A Model of Gravity Vector Measurement Noise for Estimating Accelerometer Bias in Gravity Disturbance Compensation

Sensors, 2018
Compensation of gravity disturbance can improve the precision of inertial navigation, but the effect of compensation will decrease due to the accelerometer bias, and estimation of the accelerometer bias is a crucial issue in gravity disturbance ...
Junbo Tie, Juliang Cao, Lubing Chang, Shaokun Cai, Meiping Wu, Junxiang Lian   +5 more
doaj   +1 more source

Understanding the global patterns of Venezuelan migration: determinants of an expanding diaspora

Development Studies Research, 2023
The economic, political and humanitarian crisis in Venezuela intensified since 2015 and has led to the largest migration crisis in the region’s modern history.
Sandro Pirovino, Elissaios Papyrakis
doaj   +1 more source

Analogue model for quantum gravity phenomenology

, 2005
So called "analogue models" use condensed matter systems (typically hydrodynamic) to set up an "effective metric" and to model curved-space quantum field theory in a physical system where all the microscopic degrees of freedom are well understood.
Barceló C, Barceló C, Bloch I, Liberati S Visser M Weinfurtner S, Liberati S Visser M Weinfurtner S, Matt Visser, Mattingly D, Silke Weinfurtner, Stefano Liberati, Trippenbach M, Visser M, Visser M, Visser M Barceló C Liberati S, Visser M Weinfurtner S   +13 more
core   +2 more sources

The impact of regional trade agreements on bilateral trade flows: A Systemic Literature Review

Competitio, 2022
This paper reviews the theoretical and empirical literature on the impact of regional trade agreements on trade. The empirical literature is arranged based on the econometric methods used to estimate the gravity model.
SIBULELE MCHANI
doaj   +1 more source

Polygon model from first order gravity

, 2004
The gauge fixed polygon model of 2+1 gravity with zero cosmological constant and arbitrary number of spinless point particles is reconstructed from the first order formalism of the theory in terms of the triad and the spin connection.
't Hooft G, 't Hooft G, 't Hooft G, 't Hooft G, 't Hooft G, Alekseev A Yu, Ashtekar A, Barbot T, Buffenoir E Noui K, Cantini L, Carlip S, Freidel L, Hosoya A, Kadar Z, Kadar Z, Livine E-R, Matschull H-J, Matschull H-J, Matschull H-J, Matschull H-J, Mess G, Moncrief V, Nelson J E, Noui K Perez A, Schroers B, Unruh W G, Waelbroeck H, Waelbroeck H, Z Kádár   +28 more
core   +1 more source

Gravimetric geoid modeling from the combination of satellite gravity model, terrestrial and airborne gravity data: a case study in the mountainous area, Colorado

Earth, Planets and Space, 2020
Constructing a high-precision and high-resolution gravimetric geoid model in the mountainous area is a quite challenging task because of the lack of terrestrial gravity observations, rough topography and the geological complexity.
Tao Jiang, Yamin Dang, Chuanyin Zhang
doaj   +1 more source