Recent content by richard.coppack

  1. R

    Graduate Question About Conservation of Energy, the Cosmological Constant and Dark Energy

    Thank you for your reply. Yes, spacetime is curved near a massive object. On a cosmic scale, isn't spacetime broadly flat?
  2. R

    Graduate Question About Conservation of Energy, the Cosmological Constant and Dark Energy

    I am confused about the cosmological constant and dark energy. In the most accepted theory, energy is created as the vacuum of space expands. This contravenes the conservation of energy. The law of conservation of energy does not hold in curved spacetime but isn't our universe flat spacetime ...
    • richard.coppack
    • Thread
    • Conservation Conservation of energy Constant Cosmological Cosmological constant Dark energy Energy
    • Replies: 3
    • Forum: Mechanics
  3. R

    Graduate Time does not run slower or faster

    I am new to the forum, so I hope my question is relevant to the discussion. By the equations of the Lorentz transformation ; from a photon's frame of reference, time = 0. By the same equations x,y and z coordinates are also = 0. Does that mean a photon does not have any coordinates in spacetime.
  4. R

    Graduate Is Clock Synchronization Truly Possible According to Einstein's Theory?

    T= 0 If we could sit on a photon and travel at the speed of light. Would a clock that we were carrying stop completely? I have always wondered. RC