Recent content by therapeuter

i figure out what this twilight zone circus is about now. i know where you guys are from. you have evacuated this forum. you then try to b.s. as real as possible about general relativity, as if you knew relativity and i didn't, and hope to discredit me in front of the important people. it's not...

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alright the discussion is finished. feel like in a twilight zone or some kind. how can you not even know what Gaussian metric is? and if minkowski metric doesn't apply to euclidean, then i should give you my head. lorentzian? this is so strange. from which world did your guys come from? it's...

LB, are you sure you know about relativity at all? you seem to be speaking gibberish. does anyone here who knows about relativity have any comment? thanks.

hello. I'm working on a philosophical summary of general relativity. i have difficulty understanding tensor. i made the following characterization; can any expert minds here tell me if i said it correctly? if anyone can take a peek to see if what i got so far is correct that'd be sooooooo...

what i have heard is that photon, since it is already flying at the speed of light, cannot be slowed down. so it cannot be going slower than the speed of light and then accelerated to the speed of light. neither can it be accelerated from the speed of light beyond the speed of light. so F = ma...

these are good references. I'm learning something new. especially the Noether theorem. does anyone else have something to say?

not sure about this "prediction" and "development" thing. I'm only asking about the philosophical meaning of what i read... to see if it's correct. I'm not trying to make a "formal" theory of the physical world. but is the "invariant mass" really an established concept? how come i read that...

i have a more serious question now. after reading that both the mass and kinetic energy of an electron will increase toward infinity when its velocity is approaching c, i realize: in the frame relative to which it is moving, the electron effectively travels a shorter and shorter distance...

hi i want to see if i got this right. i read that the interval between two events connected by light is zero, since the displacement in space, dx, is equal to the time displacement, cdt (x^2 + y^2 + z^2 - c^2t^2 = 0). does this not only explain why time stops for the object that reaches...

excellent clarification, robphy. infinite thanx. as for mejen, where are you from?

Thanks mejen, what i still don't understand is, what is the difference between ds^2=dx^2 + dy^2+dz^2-c^2dt^2 and ds^2=c^2dt^2 - dx^2 - dy^2 - dz^2 i mean, if the distance comes up 0.75 using the first equation, it will be -0.75 with the second. is that of no consequence? i mean...

this seems to mean that euclidean space is a special case of minkowskian space... is it right? (like circle is a special case of ellipsis, when the eccentricity is zero)

but einstein's statement that lorentz transformation corresponds to a rotation of the coordinates in 4 dimensional space time is still valid right? (i also guess that means that motion results in the rotation of your coordinate system: is it right?) You have to go through the modern linear...

hi thank you both, i got it. with the help of this page: http://astro.physics.sc.edu/selfpacedunits/Unit56.html and i actually didn't notice Einstein discusses this in ch. 26: http://www.marxists.org/reference/archive/einstein/works/1910s/relative/ch26.htm i think i might have...