“A preview of the ideas you're going to be reading about in ten years.” — Steven Pinker
“JUST WHAT IS DARK ENERGY?” Dark energy, itself directly unobservable, is the most bewildering substance known, the only “stuff” that acts both on subatomic scales and across the largest distances in the cosmos.
Stephon H. S. Alexander
is an associate professor of physics at Haverford College. His research focuses on unresolved problems—such as the cosmological-constant or dark-energy problem—that connect cosmology to quantum gravity and the standard model of elementary particles. Stephon H. S. Alexander's Edge Bio Page
The early universe is hot and dense; the late universe is cold and dilute. Well…why is it like that? The truth is, we have no idea.
Sean Carroll, theoretical physicist, is a senior research associate at Caltech. His research ranges over a number of topics in theoretical physics, including cosmology, field theory, particle physics, and gravitation. He is the author if a graduate textbook, Spacetime and Geometry: An Introduction to General Relativity and cofounder and contributor to the Cosmic Variance blog. Sean Carroll's Edge Bio Page