Results 31 to 40 of about 7,450,955 (310)
Quantum Gravity: Motivations and Alternatives [PDF]
, 2009 The mutual conceptual incompatibility between General Relativity and Quantum Mechanics / Quantum Field Theory is generally seen as the most essential motivation for the development of a theory of Quantum Gravity.
Hedrich, Reiner
core +1 more source
The viability of modified gravity theories [PDF]
, 2009 PhDThis thesis studies the viability of classes of modified gravity (MG) theories based on generalisations of the Einstein-Hilbert action. Particular emphasis is given to f(R) theories in both the metric and Palatini formalisms, scalar-tensor theories ...
Uddin, Kotub
core +4 more sources
Is Gravity an Entropic Force? [PDF]
, 2011 The remarkable connections between gravity and thermodynamics seem to imply that gravity is not fundamental but emergent, and in particular, as Verlinde suggested, gravity is probably an entropic force.
Shan, Gao, Shan Gao
core +1 more source
Frontiers in Earth Science, 2022 Potential field data have long been used in geophysical exploration for archeological, mineral, and reservoir targets. For all these targets, the increased search of highly detailed three-dimensional subsurface volumes has also promoted the recollection ...
José P. Calderón, Luis A. Gallardo
doaj +1 more source
The philosophy behind quantum gravity [PDF]
, 2006 This paper investigates some of the philosophical and conceptual issues raised by the search for a quantum theory of gravity. It is critically discussed whether such a theory is necessary in the first place, and how much would be accomplished if it is ...
Zinkernagel, Henrik +2 more
core +1 more source
The Influence of Bathymetry on Regional Marine Geoid Modeling in Northern Europe
Journal of Marine Science and Engineering, 2022 Although Northern Europe has been the target area in many regionwide geoid determination studies, the research has been land-focused, neglecting bathymetry information. With new projects, such as the Baltic Sea Chart Datum 2000, the attention is shifting
Sander Varbla
doaj +1 more source
environmental monitoring, cartography, image processing, sub-saharan Africa, R programming
Advances in Geodesy and Geoinformation, 2023 The article presents the reviewed and summarised research activities of the Polish research groups on gravimetry and gravity field modelling in the period of 2019–2022.
Jan Krynski +2 more
doaj +1 more source
Aerospace, 2023 Autonomous navigation and orbit determination are key problems of asteroid exploration missions. Inter-satellite range link is a type of measurement widely used in the orbit determination of Earth satellites, but not so widely used in missions around ...
Haohan Li, Xiyun Hou
doaj +1 more source
Measurement of Jupiter’s asymmetric gravity field [PDF]
Nature, 2018 The gravity harmonics of a fluid, rotating planet can be decomposed into static components arising from solid-body rotation and dynamic components arising from flows. In the absence of internal dynamics, the gravity field is axially and hemispherically symmetric and is dominated by even zonal gravity harmonics J2n that are approximately proportional to
Iess, L. +26 more
openaire +8 more sources
Gravity as a Quantum Field Theory
Symmetry, 2023 Classical gravity is understood as the geometry of spacetime, and it seems very different from the other known interactions. In this review, I will instead stress the analogies: Like strong interactions, the low energy effective field theory of gravity is related to a nonlinearly realized symmetry, and like electroweak interactions, it is a gauge ...
openaire +2 more sources