we can now test quantum gravity directly

[scruffy]

We can now test quantum gravity directly, in a controlled lab setting. Here's how.

Levitating diamonds spinning at 20 Mhz (about a billion rpm).

“Levitating Diamonds Reach Impossible Speed”: Spinning at 1.2 Billion RPM, They’re Cracking Open the Secrets of Quantum Gravity

In the cutting-edge world of quantum science, a mesmerizing experiment is unfolding. Researchers at Purdue University have achieved the seemingly impossible

www.sustainability-times.com

These diamonds are created in the lab by doping with nitrogen vacancies. This causes them to emit quantum signals that can be directly monitored.

The experimental apparatus is small. It consists of an electrical O-ring and a couple of lasers. It will easily fit inside a spinning wheel 10 m in diameter, which is sufficient to generate 1G.

Artificial Gravity

by Michael Barratt Today, astronaut Michael Barratt discusses the pros and cons of artificial gravity. The University of Houston presents this series about the machines that make our civilization run, and the people whose ingenuity created them.

engines.egr.uh.edu

Or, they could put in on a spaceship or satellite, where Earth's gravity can't be felt.

https://www.sciencedirect.com/science/article/pii/S2211379713000041

 

[Darkwind]

We can now test quantum gravity directly, in a controlled lab setting. Here's how.

Levitating diamonds spinning at 20 Mhz (about a billion rpm).

“Levitating Diamonds Reach Impossible Speed”: Spinning at 1.2 Billion RPM, They’re Cracking Open the Secrets of Quantum Gravity

In the cutting-edge world of quantum science, a mesmerizing experiment is unfolding. Researchers at Purdue University have achieved the seemingly impossible

www.sustainability-times.com

These diamonds are created in the lab by doping with nitrogen vacancies. This causes them to emit quantum signals that can be directly monitored.

The experimental apparatus is small. It consists of an electrical O-ring and a couple of lasers. It will easily fit inside a spinning wheel 10 m in diameter, which is sufficient to generate 1G.

Artificial Gravity

by Michael Barratt Today, astronaut Michael Barratt discusses the pros and cons of artificial gravity. The University of Houston presents this series about the machines that make our civilization run, and the people whose ingenuity created them.

engines.egr.uh.edu

Or, they could put in on a spaceship or satellite, where Earth's gravity can't be felt.

https://www.sciencedirect.com/science/article/pii/S2211379713000041

Interesting possible applications to this.

Think artificial gravity generators.

 

[toobfreak]

We can now test quantum gravity directly, in a controlled lab setting. Here's how.
Levitating diamonds spinning at 20 Mhz (about a billion rpm).

You do turn up some interesting articles and experiments! However, the continued efforts to try to find a GUT which unites gravity with quantum theory I believe is still doomed to failure because they keep making the same fundamentally flawed assumption about gravity, that it is just another force of nature with its own bosonic force carrier.

 

[scruffy]

You do turn up some interesting articles and experiments! However, the continued efforts to try to find a GUT which unites gravity with quantum theory I believe is still doomed to failure because they keep making the same fundamentally flawed assumption about gravity, that it is just another force of nature with its own bosonic force carrier.

Well... we could debate whether gravity waves are real or artifactual.

How can I say this... you're familiar with the concept of "entrainment"? Like, one oscillator "entraining" another?

Suppose you were investigating a black box and asking whether it was capable of being entrained.

So you send a frequency into it, and you see that the black output changes to the same frequency as the driver, and you notice that the frequency persists in the black box output, even after the source has been removed (terminated). What is your conclusion?

My answer is, you could be looking at a simple filter. The persistent output could just be ringing in the filter.

Another example - you can put two identical pendulums next to each other, start them off at different frequencies and phases, and eventually you'll notice that both frequencies and phases will align. Is this entrainment?

Well... yes and no. Yes because it meets the qualitative description, but no because underneath the covers, what you're really looking at is a saddle point in the dynamic - an unstable equilibrium.

See what I'm getting at? We see the gravity waves, but how do we know they're not just ripples through some other quantum phenomena? Gravity will affect anything with mass, and everything with mass is quantized. Does that mean gravity itself is quantized? How would we prove this?

We'd need to have the gravitational equivalent of a double slit experiment, wouldn't we? In such a case we'd have to set it up so the masses in either slit cancel, and that would be hard to do since our gravitational detectors all have mass. On the other hand, if we use a massless particle as a detector, we're subject to quantum interference.

Maybe this is why Einstein never got past a description of spacetime curvature. Maybe he realized that measuring a gravitational wave doesn't really tell us anything.