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...ason, electrovacuums are sometimes called (source-free) ''Einstein–Maxwell solutions''. ...the [[Einstein tensor]] <math>G^{ab}</math>, are well-defined. In general relativity, they can be interpreted as geometric manifestations (curvature and forces) ...

An '''electromagnetic four-potential''' is a [[General relativity|relativistic]] [[vector function]] from which the [[electromagnetic field]] As measured in a given [[frame of reference]], and for a given [[Gauge theory|gauge]], the ...

...5|publisher=Penguin Books Limited|isbn=978-1-84614-702-9|chapter=3}}</ref> In mathematics, the set of all time translations on a given system form a [[Li ...|s2cid=1652633}}</ref> [[Time crystals]], a state of matter first observed in 2017, break time-translation symmetry.<ref name=Gibney/> ...

...thumb|300px|Plot of a two-dimensional slice of the gravitational potential in and around a uniform spherical body. The [[inflection point]]s of the cross ...is zero, is by convention [[infinitely]] far away from any mass, resulting in a negative potential at any [[wikt:finite|finite]] distance. ...

...ate]] of an electric stove to the bottom of a saucepan in contact with it. In the absence of an opposing external driving energy source, within a body or ...usion|diffusion]] of molecules during their [[random motion]]. [[Photons]] in this context do not collide with one another, and so heat transport by [[el ...

...l Statue Equations.jpg|thumb|Maxwell's equations on a plaque on his statue in Edinburgh]] ...t light is an electromagnetic phenomenon. The modern form of the equations in their most common formulation is credited to [[Oliver Heaviside]].<ref name ...

{{Short description|Fundamental quantity in physics}} ...pg|thumb|right|[[Léon Foucault|Foucault]]'s [[Foucault pendulum|pendulum]] in the [[Panthéon, Paris|Panthéon]] of [[Paris]] can measure [[time]] as well ...

{{Short description|Amount of matter present in an object}} {{about|the scientific concept|the main liturgical service in some Christian churches|Mass (liturgy)|other uses|Mass (disambiguation)}} ...

...energy is known to be smooth because it doesn't accumulate preferentially in galaxies and clusters..."</ref> Dark energy's [[Energy density|density]] is ...entists thought that the gravitational attraction of [[matter]] and energy in the universe would cause the universe's expansion to slow over time. Since ...

{{Short description|Relativity concept expressed as E {{=}} mc²}} ...re the system is moving, its [[relativistic energy]] and [[Mass in special relativity|relativistic mass]] (instead of [[Rest Mass|rest mass]]) obey the same form ...

{{short description|Change of wavelength in photons during travel}} ...upercluster]] of distant galaxies (right), as compared to absorption lines in the visible spectrum of the [[Sun]] (left). Arrows indicate redshift. Wavel ...

...Spacetime diagram]]s are useful in visualizing and understanding [[Special relativity|relativistic]] effects such as how different observers perceive ''where'' a ...the [[Lorentz transformation]] and [[Special relativity|special theory of relativity]]. ...

...s no contradiction with [[Albert Einstein|Einstein's]] theory of [[special relativity]].{{sfnp|Sciama|1991|p=137}} ...of the greatest [[List of unsolved problems in physics|unsolved mysteries in physics]]. Many physicists believe that "the vacuum holds the key to a full ...

...k-formed]] from the suffix "-logy", as in "geology", "anthropology", etc., in the sense of the "study of science".<ref name=Zameck>{{cite book |first=Ste ...uld mean 'words about words'". [[Logology (theology)|Burke's "logology"]], in this [[theology|theological]] sense, has been cited as a useful tool of soc ...

...time and discussion have been invested in its current form.--> There is no general consensus among mathematicians about a common definition for their [[academ ...These results include previously proved [[theorem]]s, axioms, and{{emdash}}in case of abstraction from nature{{emdash}}some basic properties that are con ...

{{short description|List of definitions of terms and concepts commonly used in the study of engineering}} {{term|term= '''[[Absolute electrode potential]]'''}}{{defn|defn=In [[electrochemistry]], according to an [[IUPAC]] definition,<ref>[http://gol ...

{{Short description|List of definitions of terms and concepts commonly used in the study of engineering}} ...'''}}{{defn|defn='''(The double integration method)''' is a technique used in [[structural analysis]] to determine the [[Deflection (engineering)|deflect ...