Equivalence principle of general relativity holds even at gravitational extremes
This was a measurement of the Nordtvedt parameter which characterizes the difference between a gravitational field and an accelerating reference frame. If there is no difference, as GR predicts, then the parameter is 0.<p>This experiment tests the idea that gravity itself gravitates: gravity imbues very massive bodies with gravitational binding energy, and therefore more inertia. If your inertia is increased due to gravity, do you nevertheless fall at the same rate? i.e. does gravity affect the energy that itself imbues? The conclusion is consistent with &quot;yes.&quot;<p><a href="http:&#x2F;&#x2F;www.scholarpedia.org&#x2F;article&#x2F;Nordtvedt_effect" rel="nofollow">http:&#x2F;&#x2F;www.scholarpedia.org&#x2F;article&#x2F;Nordtvedt_effect</a>