Editing Gravity (section)

=== Einstein field equations ===
{{main| Einstein field equations}}
The Einstein field equations are a [[System of equations|system]] of 10 [[partial differential equation]]s which describe how matter affects the curvature of spacetime. The system is may be expressed in the form
<math display="block">G_{\mu \nu} + \Lambda g_{\mu \nu} = \kappa T_{\mu \nu},</math>
where {{mvar|G{{sub|μν}}}} is the [[Einstein tensor]], {{mvar|g{{sub|μν}}}} is the [[metric tensor (general relativity)|metric tensor]], {{mvar|T{{sub|μν}}}} is the [[stress–energy tensor]], {{math|Λ}} is the [[cosmological constant]], <math>G</math> is the Newtonian constant of gravitation and <math>c</math> is the [[speed of light]].<ref>{{Cite web |title=Einstein Field Equations (General Relativity) |url=https://warwick.ac.uk/fac/sci/physics/intranet/pendulum/generalrelativity/ |access-date=24 May 2022 |website=University of Warwick |language=en |archive-date=25 May 2022 |archive-url=https://web.archive.org/web/20220525140036/https://warwick.ac.uk/fac/sci/physics/intranet/pendulum/generalrelativity/ |url-status=live }}</ref> The constant <math>\kappa = \frac{8\pi G}{c^4}</math> is referred to as the Einstein gravitational constant.<ref>{{Cite web |title=How to understand Einstein's equation for general relativity |url=https://bigthink.com/starts-with-a-bang/einstein-general-theory-relativity-equation/ |access-date=24 May 2022 |website=Big Think |date=15 September 2021 |language=en-US |archive-date=26 May 2022 |archive-url=https://web.archive.org/web/20220526023430/https://bigthink.com/starts-with-a-bang/einstein-general-theory-relativity-equation/ |url-status=live }}</ref>