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Re: [Phys-l] teaching different descriptions of "reality"



Jack Uretsky wrote:
Hi all-
Brian Blais writes, in part, with respect to the trajectory of a thrown ball:
> 5) quantum gravity: the ball exchanges gravitons with the Earth,
which influe$> path

Sorry, Brian. This is a complete misconception. "Gravitons" represent the interactions of gravitational waves which are far too weak to perceptibly influence the trajectory of a thrown baseball.

thanks for the correction! I knew I should have read more about it before
speaking... :)

But, the modern quantum description of interaction is entirely due to particle
exchange, yes? or am I mistake on that too (it's been a while since I've looked at
it, and I don't think that I ever studied gravity with respect to these things).

How does string theory describe this process of the ball going up and down in the
Earth's gravitational field?


bb

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bblais@bryant.edu
http://web.bryant.edu/~bblais