It was begun with the invention of relativity theory and quantum theory.

It was Einstein's great general theory of relativity.

So this is general relativity, this is quantum theory.

We associate the name of Einstein with the theory of relativity.

And he was reading Einstein's recently published general theory of relativity, and he was thrilled by this theory.

Then Einstein, with his special theory of relativity, looked at a whole set of symmetries of Maxwell's equations, which are called special relativity.

Text In another 30 minutes they would reach the Theory of Relativity. And then?

And not only that, they make the analogy to relativity theory and cosmology often.

Under extreme conditions, general relativity and quantum theory allow time to behave like another dimension of space.

(d) QUICK STEP verification of the equivalence of the inertial and gravitational mass (theory of relativity) with a relative precision of 10 17.

At the same time, we physicists have been busy trying to make sense of and build on and integrate the discoveries of quantum theory and relativity.

Their work demonstrated convincingly the appropriateness of general relativity as a theory of gravitation under extreme conditions and indirectly confirmed the existence of the gravitational radiation Albert Einstein had predicted.

General Relativity Orbit Tracer

Unexpected by researchers, such a force had nevertheless been predicted in 1915 by a modification that Albert Einstein proposed to his own theory of gravity, the general theory of relativity. But he later dropped the modification, known as the cosmological term, calling it the biggest blunder of his life.

One Hundred Years of Relativity

This is a year when Einstein is basking in the glow of having discovered the special theory of relativity and decides to take on a new project, to try to understand fully the grand, pervasive force of gravity.

I'm thinking of Lorenz contractions and Einsteinian relativity.

STOCKHOLM This year marks the centenary of Albert Einstein's general theory of relativity, his masterwork describing gravity as the curvature of space and time. Yet, as is often true in science, Einstein's insights have provided physicists with as many questions as they have answered.

This computer simulation is due to a relativity group at NASA Goddard.

So there is this direct line between feminine handicraft, Euclid and general relativity.

Because they're moving real fast, relativity says the internal motions go very slow.

A few years ago, I was pretty excited to discover that there are candidate universes with incredibly simple rules that successfully reproduce special relativity, and even general relativity and gravitation, and at least give hints of quantum mechanics.

The God theory is not just a bad theory.

In theory, there is no difference between theory and practice. But, in practice, there is.

The problems with having a theory is that your theory may be loaded with cognitive biases.

Theory and empirical evidence

There was a theory.

That is the theory.

So without a theory of planetary rings and with only grainy data, you can't have a good theory.

It's just elementary probability theory.

Brian Greene on string theory

Superstring theory what is it?

But enough of the theory.

Emily Levine's theory of everything

It is not a theory.

So beautiful. What a theory.

It's not a minority theory.

Everybody likes the aquatic theory.

A Theory of Boardroom Justice

A Grand Unified Economic Theory?

The experiment confirmed his theory.

This theory is very controversial.

One small part of this E8 shape can be used to describe the curved space time of Einstein's general relativity, explaining gravity.

One of the other predictions of string theory no, that's not one of the other predictions of string theory.

This particular prediction cannot be tested (no observation could establish that the universe isat rest, even if it were), but it is impossible to change the equations of general relativity arbitrarily. They are tightly constrained by the explanatory substance of Einstein s theory, which holds that gravity is due to the curvature of spacetime, that light has the same speed for all observers, and so on.