Gravitational Forces on Mass < Planck Mass: Evidence?

[jbunch]

Is there any experimental or observational evidence that conclusively shows gravitational forces acting on mass that is less than the Planck mass? thx

 

[Vanadium 50]

Does a grain of fine sand fall? Then you have your answer.

 

[jbunch]

I should have been more explicit. I'm looking for verifiable info. on the limits of gravitational testability on a small scale. thx

 

[Vanadium 50]

I say again, does a grain of fine sand fall? Why does this not count as gravitational testability?

 

[jbunch]

It most certainly does. As I said, less than the Planck mass. Let's keep dividing that grain of sand by 2. Looking for a comprehensive list of experimental data that shows the experimental limit. thx

 

[Dohbis]

https://www.physicsforums.com/showthread.php?t=709338 ahh yes

 

[jbunch]

I don't get it. Are you saying that experiments haven't been carried out? And that there is not a limit to the experiments where we can verify in a lab a gravitational attraction? Doesn't sound crackpot to me. Just looking for the data.

 

[jbunch]

Here's a good paper showing a Gaussian distribution on Si with a length order of magnitude 10 minus 12. Looking for hard experimental data.

http://arxiv.org/pdf/1210.0457v3.pdf

 

[Bill_K]

As I said, less than the Planck mass. Let's keep dividing that grain of sand by 2.

No need to make it smaller. The Planck mass is 22 micrograms, so such a grain of sand would be about a tenth of a millimeter across, easily visible to the naked eye.

 

[ZapperZ]

I don't get this either. Don't we already have neutron-drop experiments? Isn't this smaller than 22 micrograms?

Zz.

 

[jbunch]

thanks, hadn't heard of neutron drops.

http://www.int.washington.edu/talks/WorkShops/int_13_1a/People/Gandolfi_S/Gandolfi.pdf