EntityQ986455· pop 8· linked from 110 articlesenergy conditionSign in to savesimplifying assumptions about the behavior of the stress–energy tensor in general relativityConnectionseigenvectors and eigenvaluesEntitygravityEntityInternational Standard Book NumberEntityrealityEntitytheory of relativityEntitygeneral relativityEntitymass densityEntitypressureEntitydigital object identifierEntitymomentumEntityInternational Standard Serial NumberEntitymass–energy equivalenceEntitydark energyEntityQ180686Entitysecond law of thermodynamicsEntitybibcodeEntityQ118398Entityvector fieldEntitycosmological constantEntityCambridge University PressEntityCategoriesMathematics of general relativity