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We know particles that exists outside of time: Photons, travelling at the speed of light, see their path (and their lifetime) relativistically contracted to a point (and an instant of no duration). It must obviously be mathematically possible to describe what happens to a photon in its own rest frame. We just do not know how: Just changing our frame of ...


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No complete formulation of physics without time is possible. To be physical, a formulation must explain and predict the observable universe, of which time is a fundamental feature. In a timeless formulation, no quantities can change and no events can cause or be caused. Since we overwhelmingly find that quantities do change and events have causal relations ...


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In my opinion there is a misunderstanding here in what the arrow of time means, entropy and what time is. Time is a way to measure changes in space:dx/dt ,dy/dt , dz/dt. Take a contour map. If there were no time, the contour is invariant. In a similar way that if there were no dx/dy, dy/dz,dz/dx ... three dimensional space would be an unchanging invariant ...


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I personally like the view pesented in this paper. So, different snapshots of the universe at dfferent times, should actually be considered to be different universes which are related to each other by being correlated. While awkward from an intuitive point of view, it is a far more natural from the point fo view of quantum mechanics.


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In classical mechanics, time is the unique parametrisation of dynamical systems. In relativity theory, one then sees that time is somewhat more than this, because there exists a global symmetry (the Poincaré-group) that involes time and space on an equal basis (called spacetime). Also, one can show that parametrisation by time is not the only way to do ...


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"Time" is very difficult to define properly, in General Relativity time is the 4th dimension of what is known as "spacetime" and this dimension is one which you may only move "forward" and you must move through spacetime at the speed of light, which is why time slows down as you move near the speed of light. Other than this, time is not well defined; you ...


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If we restrict ourselves to within the steady state and measure some properties Steady states do not exist in isolation . Any mass/body in isolation in space will radiate black body radiation and its thermodynamic variables will be changing, and thus will not be in a "steady state". (hence the entropy production cannot be measured since it is ...



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