A growing body of theoretical and experimental work in physics is converging on a striking possibility: time, the dimension humans experience as a constant forward flow, may not be a fundamental ...

This puzzle is known as the problem of time, and it remains one of the most persistent obstacles to a unified theory of ...

Arts and Science researchers developed particles that use sound waves to swing in the air without external forces to determine their rate of oscillation. The discovery could further research on other ...

Physicists at NYU have discovered a new type of time crystal—an exotic state of matter whose particles rhythmically “tick” while levitating on sound waves.

Physicists have demonstrated that waves can bounce off boundaries in time, not just in space, producing signals that behave ...

“This retroactive idea. It has to be that,” says Nobel Prize-winning mathematical physicist Sir Roger Penrose, reflecting on a problem about the building blocks of reality that has dogged physics for ...

What if the flow of time isn’t as one-way as it seems? Researchers from the University of Surrey have uncovered evidence that in the strange world of quantum physics, time could theoretically run both ...