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In physics, spacetime, also called the space-time continuum, is a mathematical model that fuses the three dimensions of space and the one dimension of time into a single four-dimensional continuum. Spacetime diagrams are useful in visualizing and understanding relativistic effects, such as how different observers perceive where and when events occur.
Nov 18, 2023 · Spacetime acts on momenergy, telling it bow to move; momenergy reacts back on spacetime, telling it bow to curve. This "handshake" between momenergy and spacetime is the origin of momenergy conservation - and the source of spacetime curvature that leads to gravitation (Box 9-1). _____
- You Can’T Tell If You’Re Moving
- Space and Time Are Linked
- Understanding Gravity
In 1632, even before Newton published his now-famous work, Galileo Galilei wrote about the relative motion of objects familiar in his time: ships. If you are in a closed room on a ship sailing at a constant speed and the ride is perfectly smooth, objects behave as they would on land. There’s no physical experiment you could conduct to tell whether ...
Almost 300 years after Galileo, Einstein pondered the consequences of relativity in the context of an important factor: the speed of light. He wasn’t the only person who was pondering these topics—other physicists at the time were aware that there were unanswered questions on this front. But it was Einstein who formulated a theory—his theory of spe...
Einstein’s description of gravity leads to situations just as bizarre as special relativity—time travel included!
How the geometry of space-time changes when matter is present—namely, that the curvature expressed in terms of the excess radius is proportional to the mass inside a sphere, Eq. ( 42.3 ). How objects move if there are only gravitational forces—namely, that objects move so that their proper time between two end conditions is a maximum.
4 days ago · Relativity - Curved Space-Time, Geometric Gravitation: The singular feature of Einstein’s view of gravity is its geometric nature. (See also geometry: The real world.) Whereas Newton thought that gravity was a force, Einstein showed that gravity arises from the shape of space-time. While this is difficult to visualize, there is an analogy that provides some insight—although it is only a ...
Rather, Einstein described them in terms of the geometry of spacetime, i.e. the curvature of spacetime. These tidal accelerations are strictly local. It is the cumulative total effect of many local manifestations of curvature that result in the appearance of a gravitational force acting at a long range from Earth. [1]: 175–190
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The "curvature of spacetime" in general relativity mathematically just means that the distances between objects change in a curved spacetime from what one would expect in Euclidean geometry. For instance, a person living on the surface of a sphere, a curved space, doesn't expect that the shortest path between two points is a straight line.
