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second reply: do you now what action-at-a-distance is? It doesn't require the fictional gravitons. Newtonian mechanics doesn't require such imaginary particles.
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:::::Actually, any quantum theory of gravity, whether it reduces to GR at large scales or not, requires gravitons ''by definition''.  Do you even understand what a graviton ''is''?  ''The quantum of a gravitational field.''  Just as any quantum theory of electromagnetism ''must'' include the photon in its particle spectrum, any quantum theory of gravity ''must'' include the graviton in its particle spectrum.  And yes, string theory requires them; the entire reason string theory started being developed as a theory of everything is that gravitons (i.e. massless spin-2 bosons) naturally appear as part of its particle spectrum! [[User:Yill|Yill]] 14:57, 6 April 2010 (EDT)
 
:::::Actually, any quantum theory of gravity, whether it reduces to GR at large scales or not, requires gravitons ''by definition''.  Do you even understand what a graviton ''is''?  ''The quantum of a gravitational field.''  Just as any quantum theory of electromagnetism ''must'' include the photon in its particle spectrum, any quantum theory of gravity ''must'' include the graviton in its particle spectrum.  And yes, string theory requires them; the entire reason string theory started being developed as a theory of everything is that gravitons (i.e. massless spin-2 bosons) naturally appear as part of its particle spectrum! [[User:Yill|Yill]] 14:57, 6 April 2010 (EDT)
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:::::: Yill, do you now what [[action-at-a-distance]] is?  It doesn't require the fictional gravitons.  Newtonian mechanics doesn't require such imaginary particles.--[[User:Aschlafly|Andy Schlafly]] 00:00, 7 April 2010 (EDT)
    
::The "flatness problem" refers primarily to curvature expected from inflation, not GR itself.  It is misleading to call the counterexample the "flatness problem," and then pretend it has a solution.  The counterexample described is not resolved.--[[User:Aschlafly|Andy Schlafly]] 21:12, 5 April 2010 (EDT)
 
::The "flatness problem" refers primarily to curvature expected from inflation, not GR itself.  It is misleading to call the counterexample the "flatness problem," and then pretend it has a solution.  The counterexample described is not resolved.--[[User:Aschlafly|Andy Schlafly]] 21:12, 5 April 2010 (EDT)
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