Tyngdekraften og universets udvidelse (5)

Glenn Møller-Holst skrev:

Mogens Michaelsen wrote:

Jeg har tidligere i denne gruppe fremsat den ide, at universets
accellererende udvidelse kunne forklares med tyngdekraften. Vel
at mærke baseret på en *modificeret* teori om tyngdekraften. Men
således at "Dark Matter" ikke eksisterer!

Jeg har fundet en overordentlig interessant artikel, hvor nogle
fysikere arbejder med teorier der ligner meget:

http://essayus.blogspot.com/

Der er links til mere videnskabelige udredninger i artiklen.

Hej Mogens og andre interesserede

Forskerne står næsten i kø for at komme med deres bud:
http://da.wikipedia.org/wiki/
Gravitation#Gravitation.2C_solsystemer.2C_galakser_og_universet

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Men vent på resultatet af Gravity Probe B - der burde snart dukke nogle op:

Stanford: What is Gravity Probe B?:
http://einstein.stanford.edu/content/story_of_gpb/gpbsty1.html

The Geodetic Effect: Measuring the Curvature of Space-time:
http://einstein.stanford.edu/content/story_of_gpb/gpbsty3.html
Citat: "... Third, most important, Gravity Probe B investigates the gravitational action of moving matter. Matter moving through space-time can be thought of as creating a new force -- gravitomagnetism -- which John Wheeler, dean of relativists, describes as being "as different from ordinary gravity as magnetism is from electricity." The frame-dragging measurement detects this force and fixes its scale. Commenting on its unverified status, Wheeler has said "It is hard to imagine a science so exposed for lack of evidence on a force so fundamental to the scheme of physics."..."

2004-09-09, Sciencedaily: NASA Gravity Probe B Mission Enters Science Phase, Ready To Test Einstein's Theory:
http://www.sciencedaily.com/releases/2004/09/040908091101.htm

Gravity Probe B News - Marshall Space Flight Center Space News:
http://www.gravityprobeb.com/

10.03.05 NEWS RELEASES
NASA'S Gravity Probe B Mission Completes Data Collection:
http://www.nasa.gov/centers/marshall/
news/news/releases/2005/05-160.html

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Physics FAQ, 29-Apr-1998 Does Gravity Travel at the Speed of Light?:
http://math.ucr.edu/home/baez/physics/Relativity/GR/grav_speed.html
Citat: "...In general relativity, on the other hand, gravity propagates at the speed of light; that is, the motion of a massive object creates a distortion in the curvature of spacetime that moves outward at light speed....Strictly speaking, gravity is not a "force" in general relativity..."
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Stanford, Dr. Sten Odenwald:

Special & General Relativity Questions and Answers:
http://einstein.stanford.edu/content/relativity/qanda.html

What happens in the space between gravitating bodies?:
http://einstein.stanford.edu/content/relativity/a11277.html

Why does the warping of space near the Earth make its orbit elliptical, but has no effect upon light?:
http://einstein.stanford.edu/content/relativity/a10884.html

Are there really such things as gravitons?:
http://einstein.stanford.edu/content/relativity/q2869.html
Citat: "...We do not know..."

Is gravity the exchange of gravitons, or the curvature of space-time?:
http://einstein.stanford.edu/content/relativity/q1669.html
Citat: "...there is no currently believable quantum theory of gravity involving 'gravitons'. We do not even know, a priori, whether there are such things as gravitons even though we have isolated the particles responsible for the other three forces in nature..."

mvh/Glenn

Hold kæft en masse links!
De ser overordentligt interessante ud mange af dem, synes jeg.


--
Mogens Michaelsen
http://mogmichs.blogspot.com/