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General relativity is a metric theory of gravitation. At its core are Einstein's equations, which describe the relation between the geometry of a four-dimensional pseudo-Riemannian manifold representing spacetime, and the energy–momentum contained in that spacetime.
Sep 15, 2021 · Learn how Einstein's equation relates spacetime curvature to matter and energy in plain English. Discover the meaning and history of the cosmological constant, the metric, and the stress-energy tensor.
- Ethan Siegel
- An Introduction of Sorts For A Disorganized Section
- Cosmological Constant
- Unorganized Thoughts
- Evolution of The Universe
- Time Dilation
- Gravitational Doppler Effect
- Event Horizon
- Gravitational Waves
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In the olden days. Welcome to another paradigm shift. The principle of equivalence… 1. The absence of a gravitational field (true weightlessness) is indistinguishable from free fall acceleration in a gravitational field (apparent weightlessness). 2. Accelerated motion in the absence of a gravitational field (apparent weight) is indistinguishable fr...
Space-time is more than just a set of values for identifying events. Space-time is a thing unto itself. The cosmological constant is a quantity used in general relativity to describe some properties of space-time. Here's how it goes. Maybe gravity is the curvature of space-time caused by the mass-energy of stuff within it plus the energy of space i...
precession of closed (and open) orbitsgravitational bending of lightGravity Probe A (1976)Gravity Probe B (2004–2005)The Friedmann equation (1923). The standard model of cosmology. A single ordinary differential equation that comes out of the ten coupled nonlinear partial differential equations of Einstein. where… Hubble constant, Hubble parameter, expansion rate The Friedmann equation again. Critical density. Density parameter. Big bang. Georges Lemaître. 2nd Fr...
Time runs slower for a moving object than a stationary one. This consequence of Einstein's theory of special relativity is known as time dilationand it works like this… where… The greater the speed of the moving observer, the closer the ratio v2/c2 is to one, the closer the denominator √(1 − v2/c2)is to zero, the more the time dilates, stretches, e...
Motional doppler (special relativity) Gravitational doppler (general relativity) 1. 1959 Harvard Tower Experiment. Pound, Rebka, and Snyder. Jefferson Physical Laboratory, Harvard. Confirmed in an experiment conducted in an elevator(?) shaft at Harvard University by Robert Pound (1919–2010) and Glen Rebka(1931–2015) in 1959. A source of gamma rays ...
Whatever makes 2Gm/rc2 approach one, makes the dominator √(1 − 2Gm/rc2)approach zero, and makes the time of an event stretch out to infinity. That happens when an event approaches the following distance from a gravitating body… This distance is known as the Schwarzschild radius. Another way to write the equation for gravitational time dilation is i...
binary pulsars spiraling into one anothersuspended aluminum cylinderdiscovered for real in 2015, reported in 2016interferometerLearn about the principle of equivalence, the Einstein field equations, the cosmological constant, and the tests of general relativity. The web page also covers the evolution of the universe, the Friedmann equation, and the standard model of cosmology.
General relativity is Einstein's theory of gravity, in which gravitational forces are presented as a consequence of the curvature of spacetime. In general relativity, objects moving under gravitational attraction are merely flowing along the "paths of least resistance" in a curved, non-Euclidean space.
May 2, 2024 · General relativity, part of the wide-ranging physical theory of relativity formed by the German-born physicist Albert Einstein. It was conceived by Einstein in 1916. General relativity is concerned with gravity, one of the fundamental forces in the universe. Gravity defines macroscopic behaviour,
- The Editors of Encyclopaedia Britannica
General relativity is a theory of gravitation developed by Albert Einstein between 1907 and 1915. The theory of general relativity says that the observed gravitational effect between masses results from their warping of spacetime.
Einstein field equations. In the general theory of relativity, the Einstein field equations ( EFE; also known as Einstein's equations) relate the geometry of spacetime to the distribution of matter within it. [1]
