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17 lut 2000 · Time travel has been a staple of science fiction. With the advent of general relativity it has been entertained by serious physicists. But, especially in the philosophy literature, there have been arguments that time travel is inherently paradoxical.
The rubber sheet analogy helps with visualization of space-time, but Einstein himself developed a complete quantitative theory that describes space-time through highly abstract mathematics. General relativity is expressed in a set of interlinked differential equations that define how the shape of space-time depends on the amount of matter (or ...
11 sie 2021 · Einstein’s theory of gravitation is expressed in one deceptively simple-looking tensor equation (tensors are a generalization of scalars and vectors), which expresses how a mass determines the curvature of space-time around it.
Equation 26.20 has the form of a one-dimensional conservation of energy equation where the (1/H0)2(da/dt)2 term is the kinetic energy, the curvature parameter plays the role of the conserved total energy, and the remaining terms (when negated) play the role of an a-dependent potential energy.
General relativity is the theory of space and time and gravity. The essence of the theory is simple: gravity is geometry. The effects that we attribute to the force of gravity are due to the bending and warping of spacetime, from falling cats, to orbiting spinning planets, to the motion of the cosmos on the grandest scale. The purpose of
18 maj 2015 · How is Einstein's equation (Gμν = 8πG Tμν) actually applied? And how does it support the theory of time travel. Answer: Many physicists refer to this as Einstein’s Equations (plural) because it's actually a set of several equations. The symbol Gμν denotes the "Einstein tensor," which is a measure of how much space-time is curving.
According to the general theory of relativity, a gravitational field bends light. What does this have to do with time and space?
