coupling constant of thermal forces

[AntonioLao]

they will add a new catchy phrase

These three catchy slogans properly describe the properties of the photon as the quantum of light. As for gravity, the 4th catchy slogan could be 'duality without visibility.' Meaning that the duality of nature is intrinsic and cannot be separated into personalized individuality or singularity. For example, a person can be potentially good or bad but actualized this person can either be good or be bad but not both. Some more links for the continuing search for graviton:
John Archibald Wheeler died almost two years ago but his coauthor Ignazio Ciufolini for Gravitation and Inertia, Princeton University Press, Princeton, NJ 1995 should be able to continue research on geometrodynamics. http://iopscience.iop.org/0264-9381/...rect=migration and http://en.wikipedia.org/wiki/Gravity_Probe_B
http://www-conf.slac.stanford.edu/pi.../ciufolini.pdf

[Bogie]

These three catchy slogans properly describe the properties of the photon as the quantum of light. As for gravity, the 4th catchy slogan could be 'duality without visibility.' Meaning that the duality of nature is intrinsic and cannot be separated into personalized individuality or singularity. For example, a person can be potentially good or bad but actualized this person can either be good or be bad but not both. Some more links for the continuing search for graviton:
John Archibald Wheeler died almost two years ago but his coauthor Ignazio Ciufolini for Gravitation and Inertia, Princeton University Press, Princeton, NJ 1995 should be able to continue research on geometrodynamics. http://iopscience.iop.org/0264-9381/...rect=migration and http://en.wikipedia.org/wiki/Gravity_Probe_B
http://www-conf.slac.stanford.edu/pi.../ciufolini.pdf

Thank you for the links. It is interesting that there are ways to measure those effects and even more interesting that the pieces might actually be there to put together a physical explanation of gravity; that is the goal isn't it?

There is no question that we can predict gravitational effects with a very high degree of accuracy. However since much of the technical information in those links is beyond me, let me ask you straight out, are we closing in on how gravity works physically, cause and effect, in addition to how to accurately predict its effects? Will success mean that we will be able to describe the mechanics of gravity or will we be hanging our hats on mathematics that works?

[AntonioLao]

are we closing in on how gravity works

The most successful theory on gravity is, of course, Einstein's general theory of relativity. it is experimentally verified at the least by three astrophysical observations: (1) The perihelion shift of planet Mecury, (2) the bending of starlight by the sun, (2) Solar gravitational Doppler redshift. The modern predictions for black holes, gravitons, and gravity waves remain unaccountable. Among these, gravity waves can be useful to astrophysical observations in addition to using the electromagnetic spectrum.