WebMar 15, 1996 · We derive the following strong energy conditions for R+βR2gravity (β≠0): (1) For the k<0FRW metric, the SEC is 0<~n<~4, i.e., −ρn<~pn<~13ρn; (2) for the k=0FRW … Web22 hours ago · The shares are currently trading for $33.82 and their $47.11 average price target suggests a gain of 39% over the next 12 months. (See NOG stock forecast) …

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The strong energy condition is obeyed by all normal/Newtonian matter, but a false vacuum can violate it. Consider the linear barotropic equation state =, where is the matter energy density, is the matter pressure, and is a constant. See more In relativistic classical field theories of gravitation, particularly general relativity, an energy condition is a generalization of the statement "the energy density of a region of space cannot be negative" in a relativistically … See more In general relativity and allied theories, the distribution of the mass, momentum, and stress due to matter and to any non-gravitational fields is … See more There are several alternative energy conditions in common use: Null energy condition The null energy … See more While the intent of the energy conditions is to provide simple criteria that rule out many unphysical situations while admitting any physically reasonable situation, in fact, at … See more In order to understand the statements of the various energy conditions, one must be familiar with the physical interpretation of some scalar and vector quantities constructed from arbitrary timelike or null vectors and the matter tensor. First, a unit timelike … See more Perfect fluids possess a matter tensor of form $${\displaystyle T^{ab}=\rho u^{a}u^{b}+ph^{ab},}$$ where $${\displaystyle {\vec {u}}}$$ is the four-velocity of the matter particles and where See more • Congruence (general relativity) • Exact solutions in general relativity • Frame fields in general relativity • Positive energy theorem See more WebJun 7, 2016 · Strong energy condition and the repulsive character of f (R) gravity. The Raychaudhuri equation enables to examine the whole spacetime structure without … poe thyala

Strong energy condition and the repulsive character of

WebMar 27, 2024 · Why strong energy condition and weak energy condition are relevant in GTR? Stack Exchange Network Stack Exchange network consists of 181 Q&A communities … WebAn energy condition, in the context of a wide class of spacetime theories (including general relativity), is, crudely speaking, a relation one demands the stress-energy tensor of matter … WebHowever, the energy conditions on which these theorems are based on, are beginning to look at less secure if one takes into accounts quantum effects which can violate these energy conditions. Even there are classical systems that can violate these energy conditions which would be problematic in validation of those theorems. poe through sacred ground quest