The original point i was making was that schrodingers thought experiment was intended to refute, not support or demonstrate the copenhagen interpretation as was claimed.
That aside the observer effect is a very old idea and has been displaced with newer theories
One must define observer and measurement
Quantum decoherance is now the better accepted theory
Which brings us back to the von Neumann chain
http://www.physicsforums.com/showthread.php?t=498186
The math is at the links within this one, but this commentator nails it
Schrodinger himself subscribed to a deterministic answer
Long story short, the universe measures itself, it does not need a conscious observer
Erwin Schrödinger's intention for his infamous cat-killing box was to discredit certain non-intuitive implications of quantum mechanics
That aside the observer effect is a very old idea and has been displaced with newer theories
One must define observer and measurement
However, most quantum physicists, in resolving Schrödinger's seeming paradox, now understand that the acts of 'observation' and 'measurement' must also be defined in quantum terms before the question makes sense. From this point of view, there is no 'observer effect', only one vastly entangled quantum system
Quantum decoherance is now the better accepted theory
In the last few decades, major advances have been made toward a theoretical understanding of the collapse process. This new theoretical framework, called quantum decoherence, supersedes previous notions of instantaneous collapse and provides an explanation for the absence of quantum coherence after measurement. Decoherence correctly predicts the form and probability distribution of the final eigenstates, and explains the apparent randomness of the choice of final state in terms of einselection.[4]
Accepting that wavefunctions are physically real, Penrose believes that things can exist in more than one place at one time. In his opinion, a macroscopic system, like a human being, cannot exist in more than one place for a measurable time, as the corresponding energy difference is very large. A microscopic system, like an
electron, can exist in more than one location forever, unless the energy difference becomes large enough.[3][need quotation to verify]
In Einstein's theory, any object that has mass causes a warp in the structure of space and time around it. This warping produces the effect we experience as gravity. Penrose points out that tiny objects, such as dust specks, atoms and electrons, produce space-time warps as well. Ignoring these warps is where most physicists go awry. If a dust speck is in two locations at the same time, each one should create its own distortions in space-time, yielding two superposed gravitational fields. According to Penrose's theory, it takes energy to sustain these dual fields. The stability of a system depends on the amount of energy involved: the higher the energy required to sustain a system, the less stable it is. Over time, an unstable system tends to settle back to its simplest, lowest-energy state: in this case, one object in one location producing one gravitational field. If Penrose is right, gravity yanks objects back into a single location, without any need to invoke observers or parallel universes.[2]
Objective collapse theories[edit]
According to objective collapse theories, superpositions are destroyed spontaneously (irrespective of external observation) when some objective physical threshold (of time, mass, temperature, irreversibility, etc.) is reached. Thus, the cat would be expected to have settled into a definite state long before the box is opened. This could loosely be phrased as "the cat observes itself", or "the environment observes the cat".
Objective collapse theories require a modification of standard quantum mechanics to allow superpositions to be destroyed by the process of time evolution. This process, known as "decoherence", is among the fastest processes currently known to physics.
Which brings us back to the von Neumann chain
http://www.physicsforums.com/showthread.php?t=498186
The math is at the links within this one, but this commentator nails it
Von Neumann meant it literally - it can be made anywhere.
But nowadays dechorence solves the issue. And with digital recording equipment in the form of computers these days its really hard to see exactly why you need conciousness to collapse it anyway.
Schrodinger himself subscribed to a deterministic answer
Einstein and Schrödinger did not like the fundamental randomness implied by quantum mechanics. They wanted to restore determinism to physics. Indeed Schrödinger's wave equation predicts a perfectly deterministic time evolution of the wave function
Long story short, the universe measures itself, it does not need a conscious observer
Last edited by a moderator: