Thread: Negative Energy/Negative Mass

if we plug in negative values into einsteins equations what strage behaviour would it predict?

How would it affect the curvature of space?
Could a model of an expanding universe be created from a negative energy based model?

Originally Posted by tom

if we plug in negative values into einsteins equations what strange behavior would it predict?

By Einsteins, I'm assuming you mean these few in general?

Originally Posted by tom

Could a model of an expanding universe be created from a negative energy based model?

I think you need to clarify what you mean by "Negative Energy." There's a bit more to that than just trans-versing plus or minus signs.

Originally Posted by tom

if we plug in negative values into einsteins equations what strage behaviour would it predict?

How would it affect the curvature of space?
Could a model of an expanding universe be created from a negative energy based model?

Negative mass is precluded by the Equivalence Principle. As a source of gravitational field, negative mass would generate an outward field and spacetime curvature that is continuous from infinity to the location of the body. An interesting thing about negative mass is that it appears to compress spacetime. Objects with negative mass would demonstrate some of the characteristics that we used to believe tachyons possess. Those ideas were abandoned because such characteristics violate causality.