blike Posted January 21, 2003 Posted January 21, 2003 If gravity travels faster than light, couldn't it be used to send information at superluminal speeds? By measuring gravitational effect, can't you calculate mass of the object and its relative motion?
fafalone Posted January 21, 2003 Posted January 21, 2003 Yup. But we don't yet have much control over gravity.
Radical Edward Posted January 21, 2003 Posted January 21, 2003 I thought it was demonstrated to be the same speed though...
fafalone Posted January 21, 2003 Posted January 21, 2003 It was published in a non-prestigous journal, was accurate only within 25%, and has already been harshly criticized. According to some experts they mistakenly measured the speed of light instead.
Radical Edward Posted January 21, 2003 Posted January 21, 2003 wouldn't GR just fall apart though? I thought it was one of Einstein's most basic assumptions that he had to make.
Radical Edward Posted January 21, 2003 Posted January 21, 2003 I don't really know any GR.... what would the impact be if it was superluminal?
blike Posted January 21, 2003 Author Posted January 21, 2003 Yup. But we don't yet have much control over gravity. Well, the point wasn't really that someday we could harness this potential... I thought information at >c speeds was a big no no..
fafalone Posted January 21, 2003 Posted January 21, 2003 R:alpha::beta:-(1/2)g:alpha::beta:R+:lambda:g:alpha::beta: = ((8:pi::kappa: )/c2)*T:alpha::beta: (Einstein's field equation) Look that over, I'll explain more later, late for class also need to get a better symbol set, any ideas where?
Radical Edward Posted January 21, 2003 Posted January 21, 2003 field equations? oh I'll have two, no fries.
fafalone Posted January 22, 2003 Posted January 22, 2003 Well first of all, consider the constants in the expression: :kappa: is the gravitational constant; 6.67259x10−11m3kg-1s−2 :alpha: is the fine structure constant, ~7.2993x10-3 :pi: of course is 3.14159... and c is (currently) 2.99792458x108 m/s I'll let you all work on it for a while now.
MajinVegeta Posted March 8, 2003 Posted March 8, 2003 is the gravitational constant; 6.67259x10−11m3kg-1s−2 I thought that was Boltzmann's constant (they look so much alike). How do you tell them apart? I've seen B's constant written that way too.
fafalone Posted March 9, 2003 Posted March 9, 2003 boltzman's constant wouldn't be abbreviated with a g...
Dave Posted March 9, 2003 Posted March 9, 2003 Originally posted by fafalone also need to get a better symbol set, any ideas where? you could make a load of vbcode tags for MathML i suppose. although you need mozilla or a special plugin for IE, it does make symbols (and indeed the math) look nice
Guest HYavel Posted May 5, 2003 Posted May 5, 2003 I think gravity could be the result of faster than light forces. Read "The circulating Universe, A new Dynamic" on this forum..
Guest Don Posted May 15, 2003 Posted May 15, 2003 That of which gravity is the result is not known. There are several theories. The most obvious is that gravity is an attribute of the elemental particles. That theory is out of favor because it involves action at a distance and explanation by definition. Under that theory gravity is eternal as is its host particle. If the particle moves so does its gravity, instantaneously.
NORDIC_ONE Posted November 28, 2005 Posted November 28, 2005 gravity is effectively affected as mass comes "into being"...apply a "bias" somewhere, and "SEE" how gravity "acts", ( being a "Weak" force, gravity is easily manipulated). ... When worlds are formed, bais are applied and Gravity , having allready been there, (for gravity is infinitely "faster" than light) "gives way to mass". ...(mass affects and effects gravity). Where a bias is applied, gravity is manipulated...
swansont Posted November 29, 2005 Posted November 29, 2005 gravity is effectively affected as mass comes "into being"...apply a "bias" somewhere, and "SEE" how gravity "acts", ( being a "Weak" force, gravity is easily manipulated). ... When worlds are formed, bais are applied and Gravity , having allready been there, (for gravity is infinitely "faster" than light) "gives way to mass". ...(mass affects and effects gravity). Where a bias is applied, gravity is manipulated... There is another "thread" on this, where it is "explained" that gravity is not "faster" than light. Plus, you need to "define" your terms to have them "make sense."
Severian Posted November 29, 2005 Posted November 29, 2005 What was wrong with typing [math]R_{\alpha \beta}-\frac{1}{2}g_{\alpha \beta}R+\lambda g_{\alpha \beta} = \frac{8 \pi \kappa}{c^2} T_{\alpha \beta}[/math]?
[Tycho?] Posted November 29, 2005 Posted November 29, 2005 Hasn't there been more than one experiment to determine that gravity does indeed seem to propegate at c? One was observing the collapse of a binary neutron star system, I dont remember what the other one was.
ydoaPs Posted December 3, 2005 Posted December 3, 2005 What was wrong with typing [math]R_{\alpha \beta}-\frac{1}{2}g_{\alpha \beta}R+\lambda g_{\alpha \beta} = \frac{8 \pi \kappa}{c^2} T_{\alpha \beta}[/math']? we didn't have [math]\LaTeX[/math] at the point, i think.
swansont Posted December 3, 2005 Posted December 3, 2005 '']Hasn't there been more than one experiment to determine that gravity does indeed seem to propegate at c? One was observing the collapse of a binary neutron star system, I dont remember what the other one was. Yes, mentioned in the other thread(s) about the subject.
Rosemary Posted December 4, 2005 Posted December 4, 2005 I thought that massless particles could move at, but not above the speed of light, and gravitons (if they do exist), could move at the speed of light, but not fasted.
5614 Posted December 4, 2005 Posted December 4, 2005 Rosemary: You are correct assuming that gravitons have a rest mass of 0. This is a fairly safe assumption, if gravitons exist they must have specific properties, a rest mass of 0 is one of these properties. So yes, your "thought" was correct.
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