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geordief last won the day on August 31 2018

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  1. geordief

    Tensors and electromagnetism

    Is it possible (ie not too complicated for me) to ask where the covector space ** fits into the relationship of those 3 vectors? (if only to perhaps light my path a little into this territory I am only now learning a bit about) ** I presume it must be there somewhere...
  2. I have it on authority **that tensors enable one to model the electromagnetic interaction between a " moving "charge and an electric conductor in such a way as to dispense with frames of reference . I wonder if anyone might have anything to say on the subject and whether it can be shown in more detail how this is the case. **
  3. Would there be any consequences if there was rather than there was not?
  4. No internal structure? Yes I looked at one of his videos. My head hurt succulently!!
  5. Seeing is believing.So what is going on at the deepest part of that beast? Something forceful enough to hold in the contents.. Just nowhere to go ,simple as that -the force of logic? Just like pumping up an inner tube? Gravity is resisted there because there is nothing there for gravity to push against..Is that just Newtonian? Or is the force of gravity zero anyway at the bottom?
  6. geordief

    The outer limits of spacetime

    The void itself is expanding...? Not the distance between objects in the void?
  7. geordief

    The outer limits of spacetime

    Is a sphere a mathematical rather than a physical object? (an idealization) The universe (which is what I was thinking of by "space") cannot be spherical even allowing for it being unobservable in places. So can this universe be both finite and expanding? Would the expansion itself have to be bounded for this to be possible?
  8. geordief

    The outer limits of spacetime

    Can space be both finite and continuously expanding?
  9. "Matter and antimatter cannot coexist in the same physical space because if they come into contact, they annihilate each other. This equal-but-opposite nature of matter and antimatter poses a conundrum for cosmologists, who theorize that the same amount of matter and antimatter should have exploded into existence during the birth of our universe. But if that’s true, all of that matter and antimatter should have annihilated one another, leaving nothing but energy behind." That quote from an article detailing recent findings at the Large Hadron Collider (probably a more interesting story in itself than my query) I thought I had learned that "pure energy" is a misconception but that quote seems to me to be describing it in those terms. The matter /antimatter collision seems to leave behind nothing but energy. Can anyone clear up my misunderstanding?(I thought there was a respectableschool of thought that posited that there was a zero total of energy in the universe even though perhaps this could never be shown experimentally)
  10. geordief

    Electrons in orbit in the atom

    Thanks, that will take me some time to learn.
  11. geordief

    Electrons in orbit in the atom

    Suppose there are a number of electrons at various locations (at the same energetic level) in the atom,is the probability wave used to determine these likely locations? Also do these electrons interact with each other?
  12. I think I have heard that if there is an energetic input into an atom then a constituent electron (or electrons?) will move to a higher energetic level in the atom. Am I to see this as the same electron (s?) moving from one level to another or should I imagine the first electron disappearing from the first level and the second electron materializing at the different level? Would it be the global state that determines the local state? Also is it correct to see the locations of the electrons in their levels as being determined by probability waves and not waves in space (or should that be spacetime?)
  13. I had in mind 2 lines on a sphere which we draw parallel for a short distance (locally,as I think it is described). When these 2 lines are produced (follow their own direction) they converge.
  14. Are you more of a knowledge for knowledge's sake person or is it more of an itch that needs scratching depending on the particular problem? I think the former kind is an illusion and is related to how knowledge was a more valuable commodity when it was unavailable to others. Even Trump seems to be an expert on aviation these days.
  15. I was thinking that we may be like the scallop with all those eyes around the inside edge of the shell. Each of those eyes (each of us "individually") is the universe peeking out. When we are extinguished we just go back to there whence we came (not the exact same place but the place with the same potential for what we are now experiencing to develop) The wish to "live forever " ,whilst understandable puts the cart before the horse and aims to put our puny individual capacity in charge of the running of the universe itself. Quite apart from the misery or irrelevance such an outcome would actually occasion. Strange is tempted live long enough to see things like quantum gravity understood (if I got that right). That would be a mirage;I am sure there would be many equally interesting questions following on from that.