Can spacetime be quantized?
Today, while it is generally accepted that spacetime is quantized, there is disagreement as to how quantization manifests itself [5]. Currently, the main candidates for a theory of quantum gravity are loop quantum gravity and string theory.
Does gravity need to be quantized?
Even though gravitation is made from particles (gravitons) too there isn’t a structure with continuous sequence. For this reason it is not possible to quantize the gravitational field.
Can everything be quantized?
Just because something is quantized, or fundamentally quantum in nature, doesn’t mean everything about it must be discrete. The idea that space (or space and time, since they’re inextricably linked by Einstein’s theories of relativity) could be quantized goes way back to Heisenberg himself.
What is the loop theory?
Loop quantum gravity (LQG) is a theory of quantum gravity, which aims to merge quantum mechanics and general relativity, incorporating matter of the Standard Model into the framework established for the pure quantum gravity case.
Why is there no quantum theory of gravity?
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.
How does gravity work?
The answer is gravity: an invisible force that pulls objects toward each other. Earth’s gravity is what keeps you on the ground and what makes things fall. Anything that has mass also has gravity. Objects with more mass have more gravity.
Why is gravity not Quantised?
It states that the quanta of gravitational field are small particles called gravitons (just like the quanta of light is photon). Even the characteristics of the graviton are predicted by QFT. For eg: the gravitons should have a spin four times than that of an electron. Gravitons have not yet been detected.
Has the graviton been discovered?
Unfortunately, the two don’t mesh very well. 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.