String theory is 21 st century physics that fell…

Even before string theory, especially as physics developed in the 20th century, it turned out that the equations that really work in describing nature…

— Edward Witten

“Twentieth-century physics, going full circle back to Heracleitus, postulates that all matter is in motion. In other words, there is no thing, only energy.”

— Camille Paglia

It has become part of the accepted wisdom to say that the twentieth century was the century of physics and the twenty-first century will…

— Freeman Dyson

We live, I think, in the century of science and, perhaps, even in the century of physics.

— Polykarp Kusch

[Heisenberg's seminal 1925 paper initiating quantum mechanics marked] one of the great jumps—perhaps the greatest—in the development of twentieth century physics.

— Abraham Pais

“I have chosen to talk about one of the founder fathers of twentieth-century physics, Niels Bohr, because in both these respects he was a…

— Jacob Bronowski

String theory is an attempt at a deeper description of nature by thinking of an elementary particle not as a little point but as…

— Edward Witten

One very important aspect of string theory is definitely testable. That was the prediction of supersymmetry, which emerged from string theory in the early…

— Edward Witten

So when you ask me how string theory might be tested, I can tell you what's likely to happen at accelerators or some parts…

— Edward Witten

Superstring theories provide a framework in which the force of gravity may be united with the other three forces in nature: the weak, electromagnetic…

— Edward Witten

Quantum mechanics brought an unexpected fuzziness into physics because of quantum uncertainty, the Heisenberg uncertainty principle. String theory does so again because a point…

— Edward Witten

I just think too many nice things have happened in string theory for it to be all wrong. Humans do not understand it very…

— Edward Witten

Technically you need the extra dimensions. At first people didn't like them too much, but they've got a big benefit, which is that the…

— Edward Witten

“This unification of forces and motion has a simple consequence. In a particle theory, you can freely add all kinds of forces, so there…

— Lee Smolin

Throughout my work, I have assumed that the standard model is correct, and hence, the Higgs boson should be found. Although this is not…

— Ashoke Sen