XPost: sci.astro.research   
   From: jacob@jacob.remcomp.fr   
      
   Le 10/03/2021   11:09, Phillip Helbig (undress to reply) a écrit :   
      
   > How well do we know the value of G?   
   >   
   > G is the constant (well, as far as we know) of nature whose value is   
   > known with the least precision.  How well do we know it?  Presumably   
   > only Cavendish-type experiments can measure it directly.  Other   
   > measurements of G, particularly astronomical ones, probably actually   
   > measure GM, or GMm.  In some cases, those quantities might be known to   
   > more precision than G itself.   
   >   
   > Suppose G were to vary with time, or place, or (thinking of something   
   > like MOND here) with the acceleration in question.  Could that be   
   > detected, or would it be masked by wrong assumptions about the mass(es)   
   > involved?   
   >   
   > Just as an example, would a smaller value of G and correspondingly   
   > higher masses be compatible with LIGO observations?   
      
   There is a very interesting article in scientific american about this:   
      
   see   
      
   https://www.scientificamerican.com/article/physicists-measure-th   
   -gravitational-force-between-the-smallest-masses-yet/   
      
   [Moderator's note: See also https://www.aspelmeyer.quantum.at/news/ -P.H.]   
      
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