dark energy

Expanding Universe Mystery Deepens

Expanding Universe Mystery Deepens

An important discrepancy in measurements of the universe’s acceleration has theorists wondering whether we’ve gotten something fundamentally wrong in our understanding of the history of the universe.

String Theorists’ Heads Bobble Over Potential Dark Energy Wobble

String Theorists’ Heads Bobble Over Potential Dark Energy Wobble

Harvard physicist Cumrun Vafa is one of string theory’s strongest proponents. But this winter, other string theorists have been reeling from his latest conjecture, which might invalidate their ideas built on a decade-long assumption that dark energy is constant. Vafa’s work implies that dark energy’s value changes.