Is there a graviton in string theory?

Is there a graviton in string theory?

In string theory, believed to be a consistent theory of quantum gravity, the graviton is a massless state of a fundamental string. If it exists, the graviton is expected to be massless because the gravitational force has a very long range, and appears to propagate at the speed of light.

Do gravitons bend spacetime?

Gravity is not caused by curvature in spacetime. Rather, curvature is caused by the force of gravity. Einstein’s view on general relativity is often misrepresented and it is unfortunate that so much of the physics community incorrectly makes out curvature as central to the theory.

Has a graviton been observed?

Einstein’s general relativity describes how physics plays out on the scale of the universe, with gravity as the main actor. One consequence of that: while scientists know of particles associated with the strong, weak and electromagnetic forces, they have yet to discover a particle of gravity, or graviton.

Why does gravity bend space time?

Gravity is associated with the slowing of time, but that is because the gravitational effect and the time dilation effect are due to the same phenomena. The proximity of mass energy slows time and contracts space (this is what is called the curving of spacetime).

How strong is graviton?

Graviton Manipulation: Graviton can exert his gravitational control over a maximum distance of 2.36 miles from his body. Thus, the maximum volume of matter he could influence at once is 55.0585 cubic miles.

What are graviton particles?

graviton, postulated quantum that is thought to be the carrier of the gravitational field. It is analogous to the well-established photon of the electromagnetic field. Gravitons, like photons, would be massless, electrically uncharged particles traveling at the speed of light.

What causes gravity in space?

With his theory of relativity, Albert Einstein explained how gravity is more than just a force: it is a curvature in the space-time continuum. That sounds like something straight out of science fiction, but simply put, the mass of an object causes the space around it to essentially bend and curve.

Is string theory a theory of quantum gravity?

In string theory, one of the many vibrational states of the string corresponds to the graviton, a quantum mechanical particle that carries gravitational force. Thus string theory is a theory of quantum gravity . String theory is a broad and varied subject that attempts to address a number of deep questions of fundamental physics.

Is there a complete quantum field theory of 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.

How many dimensions of spacetime are there in string theory?

String theories require extra dimensions of spacetime for their mathematical consistency. In bosonic string theory, spacetime is 26-dimensional, while in superstring theory it is 10-dimensional, and in M-theory it is 11-dimensional.

Why is spin 2 required for quantum gravity?

So fundamental excitation in quantum gravity must have spin two. In string theory the oscillations of the closed string includes a symmetric tensor state that can be identified with gravity as well as anti-symmetric tensor (The Kalb Ramond field) and a scalar field (the dilaton).