Relativity and Cosmology


Arrow of Time

Authors: Eran sinbar, Yoav Weinstein, Gabriel Sinbar

The arrow of time is the "one-way direction" or "asymmetry" of time. The thermodynamic arrow of time is provided by the Second Law of Thermodynamics, which says that in an isolated system, entropy tends to increase with time (Wikipedia). Nevertheless, this asymmetry of time is not intuitive based on the Einstein’s field equations that relate to space and time as one entity. Since space is symmetrical to all directions time is also expected to be a “two way direction”. Based on Einstein’s field equations mass curves space time and curvature of spacetime is actually what Newtonian physics refer to as potential energy or the gravitational field. Two major questions can arise from this field equation interpretation: 1. Mass m, has a well-defined inherent energy based on Einstein’s special relativity equation, = 2 .The mass curves space-time and this curvature adds potential energy to its surrounding based on Einstein’s field equations. What is the source of this added potential energy? 2. Since space-time is considered as a unified description and since space is symmetric to all directions, we expect that time should flow symmetrically both to the future and to the past. We know that this is not the case and time flows only towards the future.

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[v1] 2017-10-11 02:54:20

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