 # Question: Do Gravitons Really Exist?

## Why do we need gravitons?

In the case of gravity, those particles are known as ‘gravitons’.

Most theorists believe that gravitons must exist, because quantum theory has successfully explained every other force of nature.

Quantum theory predicts that as gravity has an effectively infinite range, the graviton must have an incredibly low mass..

## Who discovered gravity?

Sir Isaac NewtonSir Isaac Newton was an English mathematician and mathematician and physicist who lived from 1642-1727. The legend is that Newton discovered Gravity when he saw a falling apple while thinking about the forces of nature.

## Does gravity exist in a vacuum?

In a vacuum, gravity causes all objects to fall at the same rate. The mass of the object does not matter. If a person drops a hammer and a feather, air will make the feather fall more slowly. … The spacecraft, its crew and any objects aboard are all falling toward but around Earth.

## Does gravity travel faster than light?

As long as gravitational waves and photons have no rest mass, the laws of physics dictate that they must move at exactly the same speed: the speed of light, which must equal the speed of gravity.

## Is gravity a quantum?

Quantum mechanics suggests everything is made of quanta, or packets of energy, that can behave like both a particle and a wave—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.

## What does boson mean?

: a particle (such as a photon or meson) whose spin quantum number is zero or an integral number — compare fermion.

## Is time a quantum?

In General Relativity, matter and energy tell space how to curve, while curved space tells matter and energy how to move. But in General Relativity, space and time are continuous and non-quantized. All the other forces are known to be quantum in nature, and require a quantum description to match reality.

## Does a graviton exist?

In theories of quantum gravity, the graviton is the hypothetical quantum of gravity, an elementary particle that mediates the force of gravity. There is no complete quantum field theory of gravitons due to an outstanding mathematical problem with renormalization in general relativity.

## Is gravity a wave or a particle?

Gravity is a force. For all other forces that we are aware of (electromagnetic force, weak decay force, strong nuclear force) we have identified particles that transmit the forces at a quantum level. In quantum theory, each particle acts both as a particle AND a wave. This is called duality.

## Can gravitons be dark matter?

We consider the possibility that the massive graviton is a viable candidate of dark matter in the context of bimetric gravity. We first derive the energy-momentum tensor of the massive graviton and show that it indeed behaves as that of dark matter fluid.

## How fast is gravity?

The best results, at the present time, tell us that the speed of gravity is between 2.993 × 10^8 and 3.003 × 10^8 meters per second, which is an amazing confirmation of General Relativity and a terrible difficulty for alternative theories of gravity that don’t reduce to General Relativity!

## What is gravity made of?

They proposed that gravity is actually made of quantum particles, which they called “gravitons.” Anywhere there is gravity, there would be gravitons: on earth, in solar systems, and most importantly in the miniscule infant universe where quantum fluctuations of gravitons sprung up, bending pockets of this tiny space- …

## Where do gravitons come from?

Since Einstein’s equations couple the geometry of spacetime with matter/energy, then mass/energy are the sources of geometric fluctuations and hence gravitons result from interactions between matter/energy and the geometry in which they live.