# If we compress a mass $M$ to create a black hole, how does it gravitational field change?

If we create a black hole by compressing a mass $$M$$ to a radius smaller than Schwarzschild Radius, would the gravitational force of the mass $$M$$ (now a black hole) be different before and after becoming a black hole?

• No, as long as the BH doesn't gain angular momentum or cahrge during collapsing.
– KP99
Sep 25 at 15:36
• Are you counting the energy & pressure required to compress the matter? Sep 25 at 15:57
• Possible duplicates: physics.stackexchange.com/q/664342/2451 and links therein. Sep 25 at 16:05
• @safesphere So does that mean black holes are impossible objects in GR?
– KP99
Sep 26 at 16:04