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Vacuum solution : ウィキペディア英語版
Vacuum solution
A vacuum solution is a solution of a field equation in which the sources of the field are taken to be identically zero. That is, such field equations are written without matter interaction (i.e.- set to zero).
==Examples==

*In Maxwell's theory of electromagnetism, a vacuum solution would represent the electromagnetic field in a region of space where there are no electromagnetic sources (charges and electric currents), i.e. where the current 4-vector vanishes:
:J^a=0
*Einstein's theory of general relativity where a vacuum solution would represent the gravitational field in a region of spacetime where there are no gravitational sources (masses), i.e. where the energy-momentum tensor vanishes:
:T_=0
*Kaluza–Klein vacuum (static) field equations
*Kasner vacuum solution

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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