Gravitational Singularities
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Within the classical theory of Newton’s gravity there is the fundamental possibility of singularity. No signal can propagate from within a singularity, but its gravitational influence is permanently present externally and depends only on the total mass, the angular momentum, … Read More

The Ontology of General Relativity
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In classical vision, space and time are containers; matter is the content. The distinctive property of matter is that it carries energy and impulse, preserved over time, resulting in energy and impulse being fundamental ontologically. (Norton 2012) General Relativity (GR) … Read More

Grandfather paradox in time travel
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(Top: original billiard ball trajectory. Middle: the billiard ball emerges from the future, and delivers its past self a strike that averts the past ball from entering the time machine. Bottom: the billiard ball never enters the time machine, giving … Read More

Time Travel
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Time travel involves traveling in a time different from the present, in the past or in the future, basically without a space travel with reference to a local coordinate system. Time travel can be made by a material body that … Read More

Special theory of relativity
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Special Theory of Relativity (or Special relativity) is the formal theory elaborated by Albert Einstein in 1905 in order to draw all the physical consequences of Galilean relativity and the principle according to which the speed of light in a … Read More

Einstein’s Relativity
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(Art drawing about the theory of relativity) The theory of relativity includes both the theory of special relativity as that of general relativity formulated by Albert Einstein in the early twentieth century, who sought to resolve the incompatibility between Newtonian mechanics and electromagnetism. The theory of special relativity, published in 1905, deals with the physics of … Read More