Can gravitons be detected?

[Josiah]

Is the fact that it detects gravitational waves, means that its also stopping it?

 

[PeterDonis]

Is the fact that it detects gravitational waves, means that its also stopping it?

No.

 

[Josiah]

Could you use that information to help come up with an idea of how to stop the gravitational wave?
If the graviton is absorbed/ makes the electrons jump to a different level, does that mean it gets stopped?

 

[PeterDonis]

Could you use that information to help come up with an idea of how to stop the gravitational wave?

If by "stop the gravitational wave" you mean "absorb all its energy", no.

If the graviton is absorbed/ makes the electrons jump to a different level, does that mean it gets stopped?

A gravitational wave is not just one graviton. Indeed, we don't even know if "graviton" is a correct model of gravitational waves at any level, as I pointed out in post #3 of this thread. We have no evidence of any quantum aspects of gravitational waves and no prospect of getting any any time soon.

 

[renormalize]

Could you use that information to help come up with an idea of how to stop the gravitational wave?
If the graviton is absorbed/ makes the electrons jump to a different level, does that mean it gets stopped?

Any gravitational wave detectable on Earth with current technology would consist of an immense number of gravitons:

(https://physics.stackexchange.com/questions/438306/can-ligo-be-explained-in-terms-of-gravitons)
Thus, the effect on the overall wave of "blocking" (absorbing) a single graviton would be utterly negligible.
But if you do yearn to fully stop a $200\,\text{Hz}$ gravitational wave carrying $2\,\text{mW/m}^2$ you "merely" need to come up with a clever way to absorb $10^{28}$ gravitons per second per meter-squared!
Good luck with that.

 

[Josiah]

Hi,
Apparently the bar detector for gravitational waves detects a single gravitational wave, thus could it be used to detect all the gravitational waves that pass through it?

 

[PeterDonis]

Apparently the bar detector for gravitational waves detects a single gravitational wave, thus could it be used to detect all the gravitational waves that pass through it?

A single bar detector can only detect a fairly narrow range of frequencies of gravitational waves. Also it is not very sensitive as compared with interferometer detectors like LIGO. So no, it will not detect all gravitational waves passing through it.

 

[Josiah]

Hi
I was just wondering if the bar detectors, are in any way related to this experiment.



Spinning superconductors have been the subject of controversial "anti-gravity" claims, most notably by Eugene Podkletnov in the 1990s, who suggested
rotating superconductors could reduce the weight of objects above them, hinting at gravity modification, but these results haven't been consistently replicated, though theories explore potential gravitomagnetic effects where rapid rotation creates subtle spacetime distortions, a concept tied to general relativity and quantum phenomena, rather than true anti-gravity, with ongoing interest from some researchers and defense agencies, despite mainstream skepticism about practical applications.

The Podkletnov Experiments & Claims

Eugene Podkletnov and his colleague claimed a fast-spinning superconducting disc, levitated magnetically and exposed to radio frequencies, caused a small, measurable weight loss (around 0.05%) in objects above it, suggesting a gravity-shielding effect.

 

[Josiah]

Is there any similarity between the bar detector and this experiment?​

​

Gravity modification experiment using a rotating superconducting disk and radio frequency fields​

Abstract​

An experiment is described which attempts to replicate the results of Podkletnov et al. concerning an alleged detection of a gravity-like force above a spinning superconductor. The experiment is based on Podkletnov’s published descriptions plus personal communications. A full description of the apparatus and operation is given.

Introduction​

This report summarizes the results of experiments performed at Hathaway Consulting Services in an effort to confirm the reported results of Podkletnov [1], [2].
In 1992 in an article in Physica C [1], Podkletnov and Nieminen claimed to demonstrate the existence of a gravity-like force from spinning bulk YBCO ceramic superconductors influenced by combined magnetic levitation forces and RF illumination. A small test mass suspended above the superconductor apparently showed a 0.05% weight loss under certain conditions. A relatively large size (145 mm diameter×6 mm thick) sintered single-layer disk with specific grain size distribution of relatively small grains was required to be levitated by Meissner magnetic levitation up to 7 mm above a single “pancake” coil operated at frequencies of 50–106 Hz. In addition, the disk was spun to high speeds using edge-oriented pseudo-rotating magnetic fields provided by a magnetic stator positioned around the periphery of the disk and operated at similar frequencies. The experiment was performed below 60 K in the vapours of liquid helium.
In 1997, Podkletnov published an updated version of the experiment on the Los Alamos Physics web site [2]. This was essentially the same experiment as reported in 1992 and achieved up to 1–2% weight loss in test objects but with the following experimental differences. A much larger superconducting disk in a ring configuration (27 cm outside diameter×8 cm inside diameter×1 cm thick) was used with a small–medium grain size distribution in a bi-layer structure. One layer was superconducting and the other was a normal conductor at the experimental operating temperatures. The disk was levitated above either three or six individual solenoidal coils and two toroidal coils threaded through the center hole of the disk and operated in a 2-phase mode to drive the disk in rotation. Determination of weight loss (or gain) was by test masses of dimensions similar to those of the superconducting disk itself.

 

[PeterDonis]

this experiment?

Where is this from?

 

[PeterDonis]

I was just wondering if the bar detectors, are in any way related to this experiment.

If by "this experiment" you mean the claims by Podkletnov (which have never actually had any evidence for them), the answer is no.

 

[Josiah]

Where is this from?

 

[PeterDonis]

@Josiah that's not a textbook or a peer-reviewed paper. You will have a very hard time finding one of those regarding Podkletnov's work.

In any case, as I've already said, it's irrelevant to the thread topic, which at this point has been sufficiently covered, so this thread is closed.