scalar event
1Lorentz scalar — In physics a Lorentz scalar is a scalar which is invariant under a Lorentz transformation. A Lorentz scalar is generated from vectors and tensors. While the vectors and tensors are altered by Lorentz transformations, scalars are unchanged.imple… …
2Tunguska event in fiction — The Tunguska event was an explosion that occurred on June 30, 1908 in the Siberian region of Russia, possibly caused by a meteoroid airburst. The event has inspired much speculation and appears in diverse fictional contexts, reviewed here. This… …
3doomsday event — noun a) An occurrence which causes the end of the universe or which destroys the planet earth; a global cataclysm. The universe will contract and grow hotter until the doomsday event that astronomers have dubbed the big crunch. b) A localized… …
4General relativity — For a generally accessible and less technical introduction to the topic, see Introduction to general relativity. General relativity Introduction Mathematical formulation Resources …
5Dark energy — Not to be confused with dark matter, dark fluid, or dark flow. Physical cosmology …
6Nordström's theory of gravitation — In theoretical physics, Nordström s theory of gravitation was a predecessor of general relativity. Strictly speaking, there were actually two distinct theories proposed by the Finnish theoretical physicist Gunnar Nordström, in 1912 and 1913… …
7Brans-Dicke theory — In theoretical physics, the Brans Dicke theory of gravitation (sometimes called the Jordan Brans Dicke theory) is a theoretical framework to explain gravitation. It is a well known competitor of Einstein s more popular theory of general… …
8Special relativity — (SR) (also known as the special theory of relativity or STR) is the physical theory of measurement in inertial frames of reference proposed in 1905 by Albert Einstein (after considerable contributions of Hendrik Lorentz and Henri Poincaré) in the …
9Feynman diagram — The Wick s expansion of the integrand gives (among others) the following termNarpsi(x)gamma^mupsi(x)arpsi(x )gamma^ upsi(x )underline{A mu(x)A u(x )};,whereunderline{A mu(x)A u(x )}=int{d^4pover(2pi)^4}{ig {mu u}over k^2+i0}e^{ k(x x )}is the… …
10Energy condition — In relativistic classical field theories of gravitation, particularly general relativity, an energy condition is one of various alternative conditions which can be applied to the matter content of the theory, when it is either not possible or… …
