🚀 go-pugleaf

"Australopithecus Afarensis" <fossil.lucy@cox.net> wrote in message
news:XPLFc.41545$6r1.28385@fed1read06...
> Come on, Bill.  What do you mean by modern?  Does Newtonian Law of gravity
> modern enough for you?  The gravitational potential energy is negative!

Are you doubting it?  If so acquaint yourself with the facts
http://hyperphysics.phy-astr.gsu.edu/hbase/gpot.html.

'Because of the inverse square nature of the gravity force, the force
approaches zero for large distances, and it makes sense to choose the zero
of gravitational potential energy at an infinite distance away. The
gravitational potential energy near a planet is then negative, since gravity
does positive work as the mass approaches. This negative potential is
indicative of a "bound state"; once a mass is near a large body, it is
trapped until something can provide enough energy to allow it to escape.'

Its relation to the overall energy of the universe is explained here
http://www.astrosociety.org/pubs/mercury/31_02/nothing.html or in just about
any book on cosmology.  The negative energy of gravitational attraction
exactly balances the positive energy of matter.

> However, the correct way to look at the amount of energy is like
> temperature.  You have negative numbers for temperature, but the
"inertial"
> observation to temperature is done on the Kelvin scale.  Energy is
similar.

I fail to see your point.

>
> It sounds like you are confused Dark Energy with negative energy.  Could
you
> point out which GR textbook you have studied?

Wald - Genral Relativity and others.  But that gravitaitoal enrgy is
negative does not require GR.

Bill

>
> ----- Original Message ----- 
> From: "Bill Hobba" <bhobba@rubbish.net.au>
> Newsgroups: sci.physics.relativity,it.scienza
> Sent: Saturday, July 03, 2004 07:39 AM
> Subject: Re: Einstein, Dirac and so on....
>
> Come again.  Modern theories predict the negative energy of gravity and
the
> positive energy of particles etc balance to give no energy.  This is a
very
> appealing state of affairs.
>
> Thanks
> Bill
>
>