The accelerating expansion of the universe is usually explained by an invisible force known as dark energy. But a new study ...

The universe’s accelerating expansion has long puzzled physicists. For decades, dark energy, an unseen force thought to make ...

The rapid acceleration of the universe’s expansion continues to challenge our understanding of fundamental physics. Why the ...

Black hole singularities should not exist, according to theories of quantum mechanics. New tweaks to Einstein's equations of general relativity could finally do away with them, and explain what truly ...

Proceedings of the National Academy of Sciences of the United States of America, Vol. 106, No. 34 (Aug. 25, 2009), pp. 14213-14218 (6 pages) We derive a system of three coupled equations that ...