# What Is The Quantum Theory Of General Relativity

## What is the quantum theory of general relativity?

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.

## Why are general relativity and quantum field theory incompatible?

In quantum field theory, the Minkowski spacetime with its set of preferred inertial frames plays the role of background spacetime. In general relativity there is no place for a background metric. In fact, the components of the metric are the physical entities we need to quantize.

## What is the relativistic quantum field theory?

Relativistic Quantum Field Theory (RQFT): RQFT refers to a QFT that’s consistent with the principles of special relativity, which include invariance under Lorentz transformations and the universality of the speed of light in vacuum.

## What is the quantum field theory?

QFT is used in particle physics to construct physical models of subatomic particles and in condensed matter physics to construct models of quasiparticles. QFT treats particles as excited states (also called quanta) of their underlying quantum fields, which are more fundamental than the particles.

## What is the difference between relativity and quantum field theory?

Under quantum field theory, particles interact over zero distance in spacetime. Under the general theory of relativity, the theorized force carrier particle for gravity, the graviton, cannot operate at zero distance.

## What is the relationship between relativity and quantum physics?

Both phenomena are like two sides of the same coin. Relativity is inside the light cone phenomena (since nothing can travel faster than light), while Quantum Mechanics is outside the light cone phenomena (allowing instant communications in ‘quantum entanglement’ experiments).

## Does gravity exist at the quantum level?

There are a number of proposed quantum gravity theories. Currently, there is still no complete and consistent quantum theory of gravity, and the candidate models still need to overcome major formal and conceptual problems.

## What are the 2 postulates of general relativity?

These are: (1) the constancy of the speed of light in vacuum and (2) the form invariance of physical laws in all inertial frames. Every textbook lists out these two postulates and derives everything from them.

## What did Einstein think of quantum field theory?

Einstein saw Quantum Theory as a means to describe Nature on an atomic level, but he doubted that it upheld a useful basis for the whole of physics. He thought that describing reality required firm predictions followed by direct observations.

## What is the contradiction between general relativity and quantum mechanics?

In theoretical physics, the problem of time is a conceptual conflict between general relativity and quantum mechanics in that quantum mechanics regards the flow of time as universal and absolute, whereas general relativity regards the flow of time as malleable and relative.

## Is quantum field theory correct?

These invisible fields sometimes act like particles, sometimes like waves. They can interact with one another. They can even, some of them, flow right through us. The theory of quantum fields is arguably the most successful scientific theory of all time.

## What is quantum theory of spacetime?

In mathematical physics, the concept of quantum spacetime is a generalization of the usual concept of spacetime in which some variables that ordinarily commute are assumed not to commute and form a different Lie algebra. The choice of that algebra still varies from theory to theory.

## Which is harder quantum physics or general relativity?

General relativity is harder than quantum mechanics. But quantum field theory is the hardest of all. There are more books on quantum mechanics published in a given period of time than books on general relativity. Books on QFT would be seen the least.

## Is general relativity harder than quantum field theory?

Quantum field theory is harder to learn than general relativity. General relativity has all conventional mathematics as prerequisites : linear algebra, tensor calculus, differential geometry, partial differential equations, etc.