hey,
I'd like to design and build an ear piece 'induction receiver'. It would function as a loudspeaker which would fit inside the ear, and would receive a signal from a bluetooth transmitter which would be worn around the neck. So, a mobile phone call could be heard in the ear piece as the...
yay...
my boas, wheeler, frankel, geroch and schutz all arrived today... so i can start reading ;) The spacetime physics is indeed the origonal red edition, with answers at the back etc. Probably won't be posting anything here for a while as i read through those, unless I'm really stuck. I'd...
Very interesting... i guess space-time curvature might very well be dynamic at the quantum level and only appear to be static at the macroscopic level. Hence a theory like GR which assumes space-time is static would model the macroscopic level or reality very well but not the quantum level.
I...
Einstein obviously managed to relate space-time content with space-time curvature sucesfully... I wonder if he was thinking about describing the other forces and perhaps even matter as space-time curvature, maybe that is the unified field theory he was searching for. If gravity can be described...
well GR is a great theory and it's all about geometry... Were SR and GR the first theories in physics to model a force in a geometric way? I can't think of any other examples, obviously there are many that came after GR like Kaulza-Klein, Strings, LQG etc. Seems like around about 1910 was the...
Interesting that it seems to be not possible to 'geometricize' mass-energy in only R^4. Heim apparently managed to geometricize all known types of particles, but that required R^6. Those two extra dimensions are not spatial or rolled up into a tiny ball like in Kaluza-Klein theory however, they...
I'm going to read 'A First Course In GR' before i post any more threads on the subject... otherwise i'd probably just be asking too many elementary questions. But, if anyone wants to clarify on one point, then feel free...
Einstein relates the stress-energy tensor to curvature right...
thanks pervect for the clarification... i sort of get it now. Is there any fundamental reason in nature why it takes 16 numbers (of which 10 are unique) to describe the stress-energy tensor, or is it just a mathematical convenience/neccesity. It seems to me that if there are several definitions...
From my very limited knowledge of General Relativity, i have the impression that mass is just considered as 'other' in this theory. By that i mean, GR assumes matter to be made of something other than space-time, and only deals with the effect that matter has on the geometry of space-time. Is...
I'm curious about the theories of Burkhard Heim. I get the impression that few really understand them, or take them seriously. I'm wondering if anyone knows enough about it to say a little about it, a kind of 'popular' overview? I know there are other threads about his theories on PF, but the...
yes of course it needs more maths, but it must go deeper than that. There are different approaches to physics... experimental, theoretical, mathematical... I'm not sure how they relate. I would think mathematical physics is even more 'rigorous' than theoretical physics.
Of course they also have a standard physics degree, but my goal is to become a theoretical physicist, so a question would be... would an undergraduate mathematical physics degree better suit me or a physics degree.