The hypothetical quantum particles that behave in gravitational terms have long been postulated and some theories have given description and dynamical attributes to them.
Ιs there any
The idea is that there are physical quantities related to gravity where more than one definite value can exist, requiring a probabilistic interpretation and prediction, such as:
- Quantum Position: In quantum mechanics, the position of an object (like an electron or even a massive particle) associated with gravitational interactions is not always definite. Therefore, the exact location is probabilistic rather than set to a single value.
- Energy Levels in Quantum Gravity:In early quantum gravity models or theories like quantum field theory in curved spacetime, the energy states of gravitational fields (or "gravitons"—the hypothetical quantum particle of gravity) can also be non-deterministic, with multiple possible values subject to probabilistic rules until measured.
-momentum
These quantities are supposedly described by a wavefunction, which gives the probability of finding the particle at different positions.
They can have multiple potential values as described by the particle’s wavefunction.
However no physical observations has ever hinted at such behavior related to gravitational interactions although scientists claim its due to experimental limitations.
However many take this as a legit field, developping it in the hope theories eventually complete the initial hypothesis in a sel consistent or scientific process - affirming way.
Yes, these particles are called gravitons, they are massless particles of spin 2. However the challenge is actually detecting their so-called shot noise. This hasn't been acheived yet.
“Is there a legit branch of physics called "physics of quantum gravitational particles"?”
- yeah, such theories exist, say, loop quantum gravity and string theories, where “quantum gravitational particles” - “gravitons” exist, gravitons are mediators of gravitation, are massless, and have spin 2.
That is another thing, that though these theories are quite legit on mainstream physics, but really are attempts “to reconcile the GR and QM”. The last is, as that is rigorously shown in the Shevchenko-Tokarevsky’s Planck scale informational physical model, in this case it is enough to read https://www.researchgate.net/publication/367397025_The_Informational_Physical_Model_and_Fundamental_Problems_in_Physicssection 6. “Mediation of the fundamental forces in complex systems”,
- is fundamentally impossible, since the GR is based on fundamentally wrong postulate that interactions in gravitationally coupled systems of bodies are interactions in systems “mass-spacetime-mass”. Correspondingly the theories above really are some strange mental constructions, contain no experimentally tested predictions, so on.
Gravity for sure is nothing else than some fundamental Nature force – as that Weak, Electric, and Nuckear/Strong Forces are; all Forces act in the unique Matter’s fundamentally absolute, fundamentally flat, fundamentally continuous, and fundamentally “Cartesian”, spacetime that has metrics (at least) [4+4+1]4D (cτ,X,Y,Z, g,w,e,s,ct)
- which fundamentally cannot be impacted by anything in Matter and impact on anything in Matter.
Correspondingly there are no any principal obstacles at inclusion of Gravity in QM, as, say, Electric [EM in the mainstream] was/is included. Gravity Force is rather similar to Electric Force, and so practically for sure there can be some “gravitational quanta” that are radiated by accelerated Gravity charges “gravitational masses” and at relaxations of some Gravity quantum states - as that are photons in Electric Force case - say, “gravitons”;
- while both – photons and gravitons – are particles, and so fundamentally cannot be/ so aren’t the Forces mediators, which are created at transmission to Electric and Gravity Forces real mediators some momentums/energy,
- and with rather non-zero probability real graviton’s spin is 1 - as the photon’s spin.
However, Gravity is extremely weak Force, and so “ordinary” QM systems, say, “gravitational atoms” don’t exist, so gravitons can be observed only when compose intensive flows – gravitational waves – as photons flows compose EM waves, what is observable only on “classic” macroscale.
Nonetheless quantum nature of Gravity well probably can be observed in experiments with photons, see suggested yet in 2007 experiment in https://www.researchgate.net/publication/215526868_The_informational_model_-_possible_tests , section 2.1.2. “Monochromatic photon beam distortion”
Cheers
Μr Nicolis,
As i said its not just enough to detect a particle i.e graviton
For a interaction to be quantum, Levels of i.e Energy have to be observed that correspond to predictions of the theory related to thst particle.
It seems to me that this obsession to discover the particle has ommitted this and this will. Lead to false hope..
P. P. Afxenti : its not just enough to detect a particle i.e graviton
Nobody ever will detect a graviton as a prediction from a provably incomplete model like QM/GRT has absolut no value for the real world.
Our world - its mass and particles are a consequence of nested EM flux. EM flux is self organized on higher dimensional manifolds, that of course never can follow any O(N) S(N) like symmetry.
Or to sum it up. Theoretical physicists miss most education one would need to properly understand flux based physics.
E.g. QM entanglement in reality is just an EM flux connection fully deterministic. Such trivial misses did lead to fake vacuum energy etc..
- Badges
- Science topic