Gravitational Forces on Mass < Planck Mass: Evidence?

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Discussion Overview

The discussion revolves around the existence of experimental or observational evidence for gravitational forces acting on masses smaller than the Planck mass. Participants explore the limits of gravitational testability on small scales, seeking verifiable information and data.

Discussion Character

  • Exploratory
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant questions whether a grain of fine sand falling constitutes evidence of gravitational forces on small masses.
  • Another participant emphasizes the need for a comprehensive list of experimental data that demonstrates the limits of gravitational testability for masses less than the Planck mass.
  • A participant references a paper discussing a Gaussian distribution related to small-scale gravitational effects, seeking hard experimental data.
  • There is a mention of neutron-drop experiments, with one participant questioning if these experiments involve masses smaller than 22 micrograms.
  • Participants express a desire for verifiable information and data rather than anecdotal evidence.

Areas of Agreement / Disagreement

Participants do not reach a consensus. There are competing views on what constitutes valid evidence for gravitational forces on small masses, and the discussion remains unresolved regarding the availability of experimental data.

Contextual Notes

Participants express uncertainty about the limits of gravitational testability and the definitions of mass in the context of gravitational forces. There are references to specific experimental setups and papers, but no definitive conclusions are drawn.

Who May Find This Useful

This discussion may be of interest to those researching gravitational physics, experimental methods in small-scale physics, or the implications of the Planck mass in gravitational theory.

jbunch
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Is there any experimental or observational evidence that conclusively shows gravitational forces acting on mass that is less than the Planck mass? thx
 
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Does a grain of fine sand fall? Then you have your answer.
 
I should have been more explicit. I'm looking for verifiable info. on the limits of gravitational testability on a small scale. thx
 
I say again, does a grain of fine sand fall? Why does this not count as gravitational testability?
 
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
 
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.
 
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
 
jbunch said:
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.
 
  • #10
I don't get this either. Don't we already have neutron-drop experiments? Isn't this smaller than 22 micrograms?

Zz.
 
  • #11
thanks, hadn't heard of neutron drops.

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

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