## What is general relativity quantum gravity?

General relativity models gravity as curvature of spacetime: in the slogan of John Archibald Wheeler, “Spacetime tells matter how to move; matter tells spacetime how to curve.” On the other hand, quantum field theory is typically formulated in the flat spacetime used in special relativity.

**Does general relativity allow for gravitons?**

There is no complete quantum field theory of gravitons due to an outstanding mathematical problem with renormalization in general relativity. In string theory, believed to be a consistent theory of quantum gravity, the graviton is a massless state of a fundamental string.

**Does general relativity contradict quantum mechanics?**

Quantum mechanics is incompatible with general relativity because in quantum field theory, forces act locally through the exchange of well-defined quanta.

### Is general relativity quantum?

In general relativity, events are continuous and deterministic, meaning that every cause matches up to a specific, local effect. In quantum mechanics, events produced by the interaction of subatomic particles happen in jumps (yes, quantum leaps), with probabilistic rather than definite outcomes.

**Does general relativity disprove gravity?**

General relativity has grown more important than it was in Einstein’s day. GETTING A GRIP ON GRAVITY Einstein’s general theory of relativity explains gravity as a distortion of space (or more precisely, spacetime) caused by the presence of matter or energy.

**Can gravitons travel faster than light?**

Even if gravity crosses the event horizon, it can not be said to travel faster than light.

#### Why can’t quantum mechanics explain gravity?

Quantum mechanics suggests everything is made of quanta, or packets of energy, that can behave like both a particle and a waveâ€”for instance, quanta of light are called photons. Detecting gravitons, the hypothetical quanta of gravity, would prove gravity is quantum. The problem is that gravity is extraordinarily weak.

**Is Newtonian physics still valid?**

Newtonian physics continues to be applied in every area of science and technology where force, motion, and gravitation must be reckoned with. However, today’s physicists, unlike Newton, know that his laws do not work in all circumstances.

**Does time exist without gravity?**

Yes, time exists without gravity! In the Minkowski spacetime of Special Relativity there is time but no gravity. Did you learn about Lorentz transformations and kinematic time dilation? They have nothing to do with gravity.