Rotating vs. Stationary Mass Grav Effects?

[Spinoff]

Does a mass in rotation exert a different effect gravitationally than the same mass at rest? I recall it does.

As a thought experiment can we take a dense, small mass and place it in extreme rotation so that it's effect on the local gravational field is intensified?
This thought experiment only works with some convenient assumptions:
The mass is not distorted by the rotation.
The rotation is very extreme, lets say a laser striking our experimental object tangentially and continuously.

What would happen?
Thank you

[tiny-tim]

Hi Spinoff! Welcome to PF! :wink:
Does a mass in rotation exert a different effect gravitationally than the same mass at rest?

Newton says no, Einstein says yes. :smile:

(a rotating body has extra energy, and energy is mass, so the same rotating body has more mass anyway; also, a rotating mass "drags spacetime" around with it very slightly … see http://en.wikipedia.org/wiki/Frame-dragging for some details)