Could dark energy be negative mass?

Negative relativistic mass would also have negative energy, and negative gravity. Dark energy behaves exactly like negative gravity. According to both Newton and Einstein negative gravity can arise from negative energy and its equivalent negative relativistic mass. What could have negative relativistic mass? read more

Yes: Dark energy could be negative mass! In the discovery of accelerating expansion of universe in 1998, negative mass and negative energy were the first result of the field equation and Friedmann equations. read more

Yes! What we are looking for in cosmology is one attraction term and one repulsion term. If a negative mass exists, we can get it. If negative mass and positive mass coexist, gravitational potential energy consists of the following three items. read more

Dark energy is not negative gravity. While it does the opposite of gravity, it behaves in much different ways. Gravity is caused by mass, and decreases with distance exponentially (to be exact to the power of -2). Dark energy is constant everywhere, but is very weak, so does not have a significant effect in short distances. read more