# What do you know about the theory of relativity?

Not stuff most people would already know.

Tell me what YOU KNOW about General/Einstein's theory of relativity.

I'm extremely curious and have been researching a lot. I want to understand more.

Especially from others' points of view on this.

### 2 Answers

- oldprofLv 77 years agoFavorite Answer
The general theory of relativity can be written in tensor notation at G + gL = 8pi T. [See source] In which case, the LHS is the geometric curvature of space time (the origin of gravity effects) and the RHS is the mass-energy tensor that warps space and time. L is the cosmological constant, which Einstein later admitted was a big mistake. As each term is a tensor, each term represents a set of equations...up to ten each depending on some assumptions.

Unlike the special TOR, the GTOR does not assume the reference frames to be non accelerating. And that's why the GTOR is more "general" than the special TOR. In fact, the GTOR starts out with the little thought experiment that says in effect: if we ride in an elevator without reference to the outside, how can we tell if the force we feel on our feet is from the elevator accelerating upward or from the force of gravity? The answer is...we can't. They are equivalent; so they must come from the same base cause. And that cause, Einstein found, is warped space and time.

The GTOR has been validated over and over by observing so-called gravity lenses. These are points in deep space where nearby massive stars bend space and time into lens like shape. So light passing nearby is bent and focused just like it would be when passing through a glass lens. Gravity lenses are observed all over space, especially near massive stars like neutron stars.

I recommend you read "The Elegant Universe" by Brian Greene who spends several chapters on the GTOR and how it has be validated through observations.

- Yawn GnomeLv 77 years ago
It peaked my interest in the ToE.

The ToE , Theory of Everything or The Universal Theory, is one that tries to bridge the space/time anomaly and some quirks in the original theory. Maybe they are quarks, people are still working on that one and that is the fun stuff.

The ToR is an amazing string of thought and consciousness. I tend to think or hope that a Grand Unified Theory is still waiting to be examined.

Source(s): peace, love and more later