Gravity

GBH "Particles of Thought" host Hakeem Oluseyi interviews Prof. David Kaiser about the puzzling nature of dark matter and how its explanation may be inconsistent with our assumptions of gravity. “If we assume we really know the laws of gravity, which Einstein wrote down beautifully just over a hundred years ago in his general theory of relativity...we have reason to be confident. But what people are saying is could dark matter be the first exception to that,” says Kaiser. 

Davide Castelvecchi of Nature explores the “ambitious scientific quarry” that gravitational-wave scientists are after, including what happened in the first few moments after the Big Bang. Castelvecchi, who speaks with MIT physicist Rainer Weiss for this piece, notes that the field has already “delivered discoveries at a staggering rate, outpacing even the rosiest expectations.”

Research Scientist Allan Adams discusses what gravitational waves reveal about the universe with Guy Raz of NPR’s TED Radio Hour. Adams explains that the detection of gravitational waves is important because they “allow us to see back in time and even unlock some of the mysteries of the origins of our universe.”

Jonathan Amos reports for The BBC on new advanced laser interferometer gravitational observatory (LIGO) facilities that are part of a project headed by MIT and Caltech to detect gravitational waves resulting from extreme cosmic events: “Confirmation of the waves' existence should open up a new paradigm in astronomy,” writes Amos.