Re: "anti-gravity"

From: Tom Capizzi (etianshrdlu_at_verizon.net)
Date: 02/17/05 

Date: Thu, 17 Feb 2005 17:13:10 GMT

"George" <georgekinley@hotmail.com> wrote in message
news:xn0dym6nw2y8nzf006@news.europe.nokia.com...
> Tesseract wrote:
>
>> If it were possible to create a particle with a negative mass, would
>> it produce an anti-gravitational effect? If so, would Newton's 3rd
>> law have a conflict?
>>
>> Is there any ideas floating around about how/if negative mass is
>> possible?
>
> there is nothing like negative mass, like there is no word like cold in
> physical sence , only hot or less hot, they are just opposite.

Actually, I have read of experiments near absolute zero involving magnetic
fields that are rapidly quenched where temperature temporarily dips below
absolute zero. However briefly, absolute temperature is negative.

In the matter at hand, general relativity establishes an equivalence between
mass and curvature of spacetime. Isn't it true that this curvature is
positive?
And the absence of mass is equivalent to flatness, or zero curvature? So,
would it not be fair to hypothesize that negative mass would be equivalent
to negative curvature of spacetime? What would a geodesic look like? Then
there are other questions. Would negative mass attract other negative mass
or would it repel?

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