Is Gravity A Quantum Field

The two archetypal classical fields are Maxwells. Although the quantum field appearing in the Lagrangian is spatially continuous the quantum states of the field are discrete.

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Answer by Viktor T.

Is gravity a quantum field. Loop quantum gravity is absolutely a quantum field theory but it is not a local quantum field theory in the same sense as quantum electrodynamics QED for example. Einstein field equation relates Einstein tensor stress-energy tensor therefore sort of relates curvature energy. What were still lacking however is a quantum field theory of gravity.

Physicists think that in this truer theory gravity must have a quantum form like the other forces of nature. This of course makes the field dynamics non-covariant. Would that mean gravity is not a usual force but may be a generalization of the concept of force into a tensor.

In the normal QFT world that stage stays fixed and unmoving throughout. Rather loop quantum gravity is still a quantum field theory in the mathematical sense a quantum theory whose dynamical variables are mathematically fields. Researchers have sought the quantum theory of gravity since the 1930s.

CTP faculty have played a pioneering role in. The theory has also been applied to describe quantum gravity in a two-dimensional world. It means that gravity stands apart from the other three fundamental forces electromagnetism and the strong and weak nuclear forces which are quantum forces described by quantum field theory and.

Gravity is all about space-time and space-time is the stage on which all the particles strut their stuff as the actors. Einstein defined gravity as space-times curvature but translating his description into the language of quantum field theory creates an infinite number of space-times much as the Earth produces an infinite collection of magnetic fields. Toth IT pro part-time physicist on Quora.

He then shows that to get back covariance you need to add a nonlocal Newtonian term to the Hamiltonian and also have the graviton couple to a conserved tensor. It generally posits a theoretical entity a graviton which is a virtual particle that mediates the gravitational force. The two pillars of modern physics are general relativity and quantum field theory the former describes the large scale structure and dynamics of space-time the latter the microscopic constituents of matter.

Quantum-field-theory general-relativity gravity metric-tensor. Quantum mechanics suggests everything is made of quanta or packets of energy that can behave like both a particle and a wavefor instance quanta of. It seems that if were willing to accept that our theory might not be reliable at all energy scales then gravity can be described in a quantum theory as a quantum field.

If we insist this must work at all energies however then it appears that description will not always work. Holographic dualities give both a new perspective into quantum gravitational phenomena as encoded in quantum field theory and a way to explore aspects of strongly coupled field theories using the gravitational dual. Quantum fields are the quantum theoretical generalizations of classical fields.

Quantum field theory quantum gravity and string theory httpspollinationsaipQmRzMy52gcyLxHJWBH4nUPHaXqUAM2Hisq62uJjBH38oK9 pollinations. Combining the two yields quantum field theory in curved space-time which is needed to. This is what distinguishes quantum gravity from certain other unified field theories -- although in fairness some theories that are typically classified as quantum gravity dont necessarily require a graviton.

And gravity is curvature. Alone of the four forces gravity has no particles attached to it and is instead explained by Einsteins general theory of. While the state space of a single quantum harmonic oscillator contains all the discrete energy states of one oscillating particle the state space of a quantum field contains the discrete energy levels of an arbitrary number of particles.

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