Results 31 to 40 of about 6,253,661 (292)
Defect Wormholes Are Defective
Universe, 2023 The various “defect wormholes” developed by Klinkhamer have recently attracted considerable attention—especially in view of the fact that the simplest example, the so-called “vacuum defect wormhole”, was claimed to be an everywhere-vacuum everywhere ...
Joshua Baines, Rudeep Gaur, Matt Visser
doaj +1 more source
Singularity theorems from weakened energy conditions [PDF]
, 2011 We establish analogues of the Hawking and Penrose singularity theorems based on (a) averaged energy conditions with exponential damping; (b) conditions on local stress-energy averages inspired by the Quantum Energy Inequalities satisfied by a number of ...
Fewster, Christopher J. +1 more
core +3 more sources
Inviolable energy conditions from entanglement inequalities [PDF]
, 2014 Via the AdS/CFT correspondence, fundamental constraints on the entanglement structure of quantum systems translate to constraints on spacetime geometries that must be satisfied in any consistent theory of quantum gravity.
Lashkari, Nima +3 more
core +2 more sources
Nanocomposites, 2023 In this work, Ni-W/diamond composite alloy coatings were successfully fabricated on low carbon steel by using direct current (DC) electrodeposition. The Ni-W molar ratio was varied in the range of 0.22–2 in the plating bath. The effect of variation of Ni-
Malay Kumar Das +2 more
doaj +1 more source
Stringy black holes and energy conditions [PDF]
, 1996 The energy condition inequalities for the matter stress energy comprised out of the dilaton and Maxwell fields in the dilaton-Maxwell gravity theories emerging out of string theory are examined in detail. In the simplistic 1+1 dimensional models, $R\le 0$
A. Borde +27 more
core +4 more sources
Null Energy Condition in Dynamic Wormholes [PDF]
Physical Review Letters, 1998 4 pages in RevTex; some textual changes made, references added and some key definitions ...
Hochberg, David, Visser, Matt
openaire +2 more sources
Energy conditions in modified Gauss-Bonnet gravity [PDF]
, 2011 In considering alternative higher-order gravity theories, one is liable to be motivated in pursuing models consistent and inspired by several candidates of a fundamental theory of quantum gravity.
A. De Felice +11 more
core +2 more sources
Criteria for energy conditions
Classical and Quantum Gravity, 2022 Abstract In model building studies, it is important to check the energy conditions for the corresponding energy–momentum tensor determined by the gravitational field equations in order to single out physically reasonable models. In this process, one often encounters a situation where the energy–momentum tensor has one off-diagonal ‘space–
Hideki Maeda, Tomohiro Harada
openaire +3 more sources
Energy Markets and Global Economic Conditions [PDF]
The Review of Economics and Statistics, 2020 AbstractWe evaluate alternative indicators of global economic activity and other market fundamentals in terms of their usefulness for forecasting real oil prices and global petroleum consumption. World industrial production is one of the most useful indicators. However, by combining measures from several different sources, we can do even better.
Baumeister, Christiane +2 more
openaire +3 more sources
Abnormal thickness-dependent magneto-transport properties of vdW magnetic semiconductor Cr2Si2Te6
npj 2D Materials and Applications, 2023 Cr2Si2Te6 (CST) is a van der Waals (vdW) ferromagnetic semiconductor. The unique spin model and temperature-dependent magnetic ordering of CST provide opportunities for the next generation of two-dimensional (2D) spintronic devices.
Yun Li +6 more
doaj +1 more source