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Instead, gravity corresponds to changes in the properties of space and time, which in turn changes the straightest-possible paths that objects will naturally follow. Theories of gravitation. Matter and geometry must satisfy Einstein's equations, so in particular, the matter's energy—momentum tensor must be divergence-free. Wntil the next volume Not only are the Lorentz transformations asymptotic symmetry transformations, there are also additional transformations that are not Lorentz transformations but are asymptotic symmetry transformations.

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General relativity - Wikipedia

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See also: Mathematics of general relativity and Physical theories modified by general relativity. Main article: Gravitational time dilation.

Main articles: Schwarzschild geodesics , Kepler problem in general relativity , Gravitational lens , and Shapiro delay. Main article: Gravitational wave. Main article: Two-body problem in general relativity. Main article: Apsidal precession. Main articles: Geodetic precession and Frame dragging. Main article: Gravitational lensing.

Main articles: Gravitational wave and Gravitational-wave astronomy. Main article: Black hole. Main article: Physical cosmology. Main article: Bondi—Metzner—Sachs group. Main article: Causal structure. Main articles: Horizon general relativity , No hair theorem , and Black hole mechanics. Main article: Spacetime singularity.

Main article: Initial value formulation general relativity. Main article: Mass in general relativity. Main article: Quantum field theory in curved spacetime. Main article: Quantum gravity. Physics portal Astronomy portal. Retrieved 18 April May Einstein's original papers are found in Digital Einstein , volumes 4 and 6. An early key article is Einstein , cf. Pais , ch. The publication featuring the field equations is Einstein , cf. Einstein's condemnation would prove to be premature, cf.

It is more. Retrieved 9 April For the experimental evidence, cf. The Einstein tensor is the only divergence-free tensor that is a function of the metric coefficients, their first and second derivatives at most, and allows the spacetime of special relativity as a solution in the absence of sources of gravity, cf.

Lovelock The fact that, as a consequence of geometric relations known as Bianchi identities , the Einstein tensor satisfies a further four identities reduces these to six independent equations, e. Schutz , sec. John Wiley. ISBN Relativity, Gravitation and Cosmology: a Basic Introduction. Stephani et al. Einstein derived these effects using the equivalence principle as early as , cf. Einstein and the description in Pais , pp. Kennefick for the classic early measurements by Arthur Eddington's expeditions.

For the most precise direct modern observations using quasars, cf. Shapiro et al. Ehlers , sec. Such calculations tacitly assume that the geometry of space is Euclidean , cf. Rindler , sec. Shapiro , Weinberg , ch. Stairs , sec. Bibcode : SPAW Archived from the original on 21 March Retrieved 12 February Nature News. S2CID Retrieved 11 February Abbott; et al.

Physical Review Letters. Bibcode : PhRvL. PMID Schutz , ch. Will , sec. London: Routledge. Retrieved 23 April Buras et al. Font , sec. Also, relativistic lensing effects are thought to play a role for the signals received from X-ray pulsars , cf.

Remillard et al. Observations of the "shadow" of the Milky Way galaxy's central black hole horizon are eagerly sought for, cf. Pais , pp. Peebles et al. Future measurements could also reveal evidence about gravitational waves in the early universe; this additional information is contained in the background radiation's polarization , cf. Peebles , ch. Peacock , sec. Peacock , ch. Here, too, scientists have argued that the evidence indicates not a new form of energy, but the need for modifications in our cosmological models, cf.

Mannheim , sec. Waves from axisymmetric isolated systems". Proceedings of the Royal Society of London A. A : 21— Physical Review. Bibcode : PhRv.. It contains a pedagogical overview of recent developments connecting the subjects of soft theorems, the memory effect and asymptotic symmetries in four-dimensional QED, nonabelian gauge theory and gravity with applications to black holes. To be published Princeton University Press, pages. A more exact mathematical description distinguishes several kinds of horizon, notably event horizons and apparent horizons cf.

A thorough, book-length introduction including an introduction to the necessary mathematics Poisson A review is given in Wald , ch.

Unruh effect: Unruh , cf. Wald , ch. Chandrasekhar , ch. The cosmic censorship conjecture was first presented in Penrose ; a textbook-level account is given in Wald , pp.

For numerical results, see the review Berger , sec. Carlip , sec. Weinberg , ch. Ibanez The theory is successful in that one mode will always correspond to a graviton , the messenger particle of gravity, e. Alpher, R. Quantum Grav. Proceedings of the 17th International Conference , World Scientific, pp. Reidel, pp. General Relativity : Bibcode : gere. Gowdy, Robert H. Bibcode : RvMP Hafele, J. Bibcode : Sci Havas, P. David , It's About Time.

Narlikar, Jayant V. Norton, John D. Robert ; Snyder, H. Living Reviews in Relativity. Bibcode : LRR PMC Poisson, Eric , A Relativist's Toolkit. Freeman, pp. Gibbons; E. Shellard; S. Rankin eds. The future of theoretical physics and cosmology: celebrating Stephen Hawking's 60th birthday. Cambridge University Press. Townsend, Paul K. High Energy Physics and Cosmology. Bibcode : hepcbconf..

Traschen, Jennie , Bytsenko, A. D , 14 4 : —, Bibcode : PhRvD.. Relativity: The Special and General Theory. Principle of relativity Galilean relativity Galilean transformation Special relativity Doubly special relativity. Lorentz transformation. Time dilation Mass—energy equivalence Length contraction Relativity of simultaneity Relativistic Doppler effect Thomas precession Ladder paradox Twin paradox. Light cone World line Minkowski diagram Biquaternions Minkowski space.

Introduction Mathematical formulation. Equivalence principle Riemannian geometry Penrose diagram Geodesics Mach's principle. Brans—Dicke theory Kaluza—Klein Quantum gravity. Theories of gravitation. Newton's law of universal gravitation Gauss's law for gravity Poisson's equation for gravity History of gravitational theory.

Classical theories of gravitation Quantum gravity Theory of everything. Kaluza—Klein theory Dilaton Supergravity. Albert Einstein. Branches of physics. Pure Applied Engineering.

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There have been numerous successful tests of this prediction. Predicted in [77] [78] by Albert Einstein, there are gravitational waves: ripples in the metric of spacetime that propagate at the speed of light. These are one of several analogies between weak-field gravity and electromagnetism in that, they are analogous to electromagnetic waves. On February 11, , the Advanced LIGO team announced that they had directly detected gravitational waves from a pair of black holes merging. The simplest type of such a wave can be visualized by its action on a ring of freely floating particles.

A sine wave propagating through such a ring towards the reader distorts the ring in a characteristic, rhythmic fashion animated image to the right. Data analysis methods routinely make use of the fact that these linearized waves can be Fourier decomposed. Some exact solutions describe gravitational waves without any approximation, e.

General relativity differs from classical mechanics in a number of predictions concerning orbiting bodies. It predicts an overall rotation precession of planetary orbits, as well as orbital decay caused by the emission of gravitational waves and effects related to the relativity of direction. In general relativity, the apsides of any orbit the point of the orbiting body's closest approach to the system's center of mass will precess ; the orbit is not an ellipse , but akin to an ellipse that rotates on its focus, resulting in a rose curve -like shape see image.

Einstein first derived this result by using an approximate metric representing the Newtonian limit and treating the orbiting body as a test particle. For him, the fact that his theory gave a straightforward explanation of Mercury's anomalous perihelion shift, discovered earlier by Urbain Le Verrier in , was important evidence that he had at last identified the correct form of the gravitational field equations.

The effect can also be derived by using either the exact Schwarzschild metric describing spacetime around a spherical mass [88] or the much more general post-Newtonian formalism. According to general relativity, a binary system will emit gravitational waves, thereby losing energy. Due to this loss, the distance between the two orbiting bodies decreases, and so does their orbital period. Within the Solar System or for ordinary double stars , the effect is too small to be observable.

This is not the case for a close binary pulsar, a system of two orbiting neutron stars , one of which is a pulsar : from the pulsar, observers on Earth receive a regular series of radio pulses that can serve as a highly accurate clock, which allows precise measurements of the orbital period. Because neutron stars are immensely compact, significant amounts of energy are emitted in the form of gravitational radiation. This was the first detection of gravitational waves, albeit indirect, for which they were awarded the Nobel Prize in physics.

Several relativistic effects are directly related to the relativity of direction. Near a rotating mass, there are gravitomagnetic or frame-dragging effects. A distant observer will determine that objects close to the mass get "dragged around". This is most extreme for rotating black holes where, for any object entering a zone known as the ergosphere , rotation is inevitable. Examples of prominent physicists who support neo-Lorentzian explanations of general relativity are Franco Selleri and Antony Valentini.

The deflection of light by gravity is responsible for a new class of astronomical phenomena. If a massive object is situated between the astronomer and a distant target object with appropriate mass and relative distances, the astronomer will see multiple distorted images of the target. Such effects are known as gravitational lensing. Gravitational lensing has developed into a tool of observational astronomy.

It is used to detect the presence and distribution of dark matter , provide a "natural telescope" for observing distant galaxies, and to obtain an independent estimate of the Hubble constant. Statistical evaluations of lensing data provide valuable insight into the structural evolution of galaxies.

Observations of binary pulsars provide strong indirect evidence for the existence of gravitational waves see Orbital decay , above. Detection of these waves is a major goal of current relativity-related research.

Observations of gravitational waves promise to complement observations in the electromagnetic spectrum. Whenever the ratio of an object's mass to its radius becomes sufficiently large, general relativity predicts the formation of a black hole, a region of space from which nothing, not even light, can escape. In the currently accepted models of stellar evolution , neutron stars of around 1. Astronomically, the most important property of compact objects is that they provide a supremely efficient mechanism for converting gravitational energy into electromagnetic radiation.

Black holes are also sought-after targets in the search for gravitational waves cf. Gravitational waves , above. Merging black hole binaries should lead to some of the strongest gravitational wave signals reaching detectors here on Earth, and the phase directly before the merger "chirp" could be used as a " standard candle " to deduce the distance to the merger events—and hence serve as a probe of cosmic expansion at large distances. Astronomical observations of the cosmological expansion rate allow the total amount of matter in the universe to be estimated, although the nature of that matter remains mysterious in part.

An authoritative answer would require a complete theory of quantum gravity, which has not yet been developed [] cf. The solutions require extreme physical conditions unlikely ever to occur in practice, and it remains an open question whether further laws of physics will eliminate them completely. Since then, other—similarly impractical—GR solutions containing CTCs have been found, such as the Tipler cylinder and traversable wormholes. It is logical to ask what symmetries if any might apply in General Relativity.

A tractable case might be to consider the symmetries of spacetime as seen by observers located far away from all sources of the gravitational field. The naive expectation for asymptotically flat spacetime symmetries might be simply to extend and reproduce the symmetries of flat spacetime of special relativity, viz. In Hermann Bondi , M. Metzner [] and Rainer K. Sachs [] addressed this asymptotic symmetry problem in order to investigate the flow of energy at infinity due to propagating gravitational waves.

Their first step was to decide on some physically sensible boundary conditions to place on the gravitational field at light-like infinity to characterize what it means to say a metric is asymptotically flat, making no a priori assumptions about the nature of the asymptotic symmetry group — not even the assumption that such a group exists.

Then after designing what they considered to be the most sensible boundary conditions, they investigated the nature of the resulting asymptotic symmetry transformations that leave invariant the form of the boundary conditions appropriate for asymptotically flat gravitational fields.

What they found was that the asymptotic symmetry transformations actually do form a group and the structure of this group does not depend on the particular gravitational field that happens to be present. This means that, as expected, one can separate the kinematics of spacetime from the dynamics of the gravitational field at least at spatial infinity. Not only are the Lorentz transformations asymptotic symmetry transformations, there are also additional transformations that are not Lorentz transformations but are asymptotic symmetry transformations.

In fact, they found an additional infinity of transformation generators known as supertranslations. This implies the conclusion that General Relativity GR does not reduce to special relativity in the case of weak fields at long distances. It turns out that the BMS symmetry, suitably modified, could be seen as a restatement of the universal soft graviton theorem in quantum field theory QFT , which relates universal infrared soft QFT with GR asymptotic spacetime symmetries. In general relativity, no material body can catch up with or overtake a light pulse.

No influence from an event A can reach any other location X before light sent out at A to X. In consequence, an exploration of all light worldlines null geodesics yields key information about the spacetime's causal structure. This structure can be displayed using Penrose—Carter diagrams in which infinitely large regions of space and infinite time intervals are shrunk " compactified " so as to fit onto a finite map, while light still travels along diagonals as in standard spacetime diagrams.

Aware of the importance of causal structure, Roger Penrose and others developed what is known as global geometry. In global geometry, the object of study is not one particular solution or family of solutions to Einstein's equations. Rather, relations that hold true for all geodesics, such as the Raychaudhuri equation , and additional non-specific assumptions about the nature of matter usually in the form of energy conditions are used to derive general results.

Using global geometry, some spacetimes can be shown to contain boundaries called horizons , which demarcate one region from the rest of spacetime. The best-known examples are black holes: if mass is compressed into a sufficiently compact region of space as specified in the hoop conjecture , the relevant length scale is the Schwarzschild radius [] , no light from inside can escape to the outside. Since no object can overtake a light pulse, all interior matter is imprisoned as well.

Passage from the exterior to the interior is still possible, showing that the boundary, the black hole's horizon , is not a physical barrier. Early studies of black holes relied on explicit solutions of Einstein's equations, notably the spherically symmetric Schwarzschild solution used to describe a static black hole and the axisymmetric Kerr solution used to describe a rotating, stationary black hole, and introducing interesting features such as the ergosphere.

Using global geometry, later studies have revealed more general properties of black holes. With time they become rather simple objects characterized by eleven parameters specifying: electric charge, mass-energy, linear momentum , angular momentum , and location at a specified time. This is stated by the black hole uniqueness theorem : "black holes have no hair", that is, no distinguishing marks like the hairstyles of humans. Irrespective of the complexity of a gravitating object collapsing to form a black hole, the object that results having emitted gravitational waves is very simple.

Even more remarkably, there is a general set of laws known as black hole mechanics , which is analogous to the laws of thermodynamics. For instance, by the second law of black hole mechanics, the area of the event horizon of a general black hole will never decrease with time, analogous to the entropy of a thermodynamic system.

This limits the energy that can be extracted by classical means from a rotating black hole e. As thermodynamical objects with non-zero temperature, black holes should emit thermal radiation. Semi-classical calculations indicate that indeed they do, with the surface gravity playing the role of temperature in Planck's law. This radiation is known as Hawking radiation cf. There are other types of horizons.

In an expanding universe, an observer may find that some regions of the past cannot be observed " particle horizon " , and some regions of the future cannot be influenced event horizon.

Another general feature of general relativity is the appearance of spacetime boundaries known as singularities. Spacetime can be explored by following up on timelike and lightlike geodesics—all possible ways that light and particles in free fall can travel.

But some solutions of Einstein's equations have "ragged edges"—regions known as spacetime singularities , where the paths of light and falling particles come to an abrupt end, and geometry becomes ill-defined. In the more interesting cases, these are "curvature singularities", where geometrical quantities characterizing spacetime curvature, such as the Ricci scalar , take on infinite values.

Given that these examples are all highly symmetric—and thus simplified—it is tempting to conclude that the occurrence of singularities is an artifact of idealization. While no formal proof yet exists, numerical simulations offer supporting evidence of its validity.

Each solution of Einstein's equation encompasses the whole history of a universe — it is not just some snapshot of how things are, but a whole, possibly matter-filled, spacetime. It describes the state of matter and geometry everywhere and at every moment in that particular universe. Due to its general covariance, Einstein's theory is not sufficient by itself to determine the time evolution of the metric tensor.

It must be combined with a coordinate condition , which is analogous to gauge fixing in other field theories. To understand Einstein's equations as partial differential equations, it is helpful to formulate them in a way that describes the evolution of the universe over time.

The best-known example is the ADM formalism. The notion of evolution equations is intimately tied in with another aspect of general relativistic physics. In Einstein's theory, it turns out to be impossible to find a general definition for a seemingly simple property such as a system's total mass or energy. The main reason is that the gravitational field—like any physical field—must be ascribed a certain energy, but that it proves to be fundamentally impossible to localize that energy.

Nevertheless, there are possibilities to define a system's total mass, either using a hypothetical "infinitely distant observer" ADM mass [] or suitable symmetries Komar mass. The hope is to obtain a quantity useful for general statements about isolated systems , such as a more precise formulation of the hoop conjecture.

If general relativity were considered to be one of the two pillars of modern physics, then quantum theory, the basis of understanding matter from elementary particles to solid state physics , would be the other. Ordinary quantum field theories , which form the basis of modern elementary particle physics, are defined in flat Minkowski space, which is an excellent approximation when it comes to describing the behavior of microscopic particles in weak gravitational fields like those found on Earth.

These theories rely on general relativity to describe a curved background spacetime, and define a generalized quantum field theory to describe the behavior of quantum matter within that spacetime. The demand for consistency between a quantum description of matter and a geometric description of spacetime, [] as well as the appearance of singularities where curvature length scales become microscopic , indicate the need for a full theory of quantum gravity: for an adequate description of the interior of black holes, and of the very early universe, a theory is required in which gravity and the associated geometry of spacetime are described in the language of quantum physics.

Attempts to generalize ordinary quantum field theories, used in elementary particle physics to describe fundamental interactions, so as to include gravity have led to serious problems. One attempt to overcome these limitations is string theory , a quantum theory not of point particles , but of minute one-dimensional extended objects. Another approach starts with the canonical quantization procedures of quantum theory. Using the initial-value-formulation of general relativity cf.

Space is represented by a web-like structure called a spin network , evolving over time in discrete steps. Depending on which features of general relativity and quantum theory are accepted unchanged, and on what level changes are introduced, [] there are numerous other attempts to arrive at a viable theory of quantum gravity, some examples being the lattice theory of gravity based on the Feynman Path Integral approach and Regge Calculus , [] dynamical triangulations , [] causal sets , [] twistor models [] or the path integral based models of quantum cosmology.

All candidate theories still have major formal and conceptual problems to overcome. They also face the common problem that, as yet, there is no way to put quantum gravity predictions to experimental tests and thus to decide between the candidates where their predictions vary , although there is hope for this to change as future data from cosmological observations and particle physics experiments becomes available.

General relativity has emerged as a highly successful model of gravitation and cosmology, which has so far passed many unambiguous observational and experimental tests. However, there are strong indications the theory is incomplete. Mathematical relativists seek to understand the nature of singularities and the fundamental properties of Einstein's equations, [] while numerical relativists run increasingly powerful computer simulations such as those describing merging black holes.

From Wikipedia, the free encyclopedia. Theory of gravitation as curved spacetime. For the graduate textbook by Robert Wald, see General Relativity book. For a more accessible and less technical introduction to this topic, see Introduction to general relativity. Introduction History. Fundamental concepts. Equivalence principle Special relativity World line Pseudo-Riemannian manifold. Equations Formalisms. Play media. Main articles: History of general relativity and Classical theories of gravitation.

Main articles: Einstein field equations and Mathematics of general relativity. See also: Two-body problem in general relativity. Main article: Alternatives to general relativity. See also: Mathematics of general relativity and Physical theories modified by general relativity. Main article: Gravitational time dilation.

Main articles: Schwarzschild geodesics , Kepler problem in general relativity , Gravitational lens , and Shapiro delay. Main article: Gravitational wave. Main article: Two-body problem in general relativity.

Main article: Apsidal precession. Main articles: Geodetic precession and Frame dragging. Main article: Gravitational lensing. Main articles: Gravitational wave and Gravitational-wave astronomy.

Main article: Black hole. Main article: Physical cosmology. Main article: Bondi—Metzner—Sachs group. Main article: Causal structure. Main articles: Horizon general relativity , No hair theorem , and Black hole mechanics. Main article: Spacetime singularity. Main article: Initial value formulation general relativity. Main article: Mass in general relativity. Main article: Quantum field theory in curved spacetime. Main article: Quantum gravity. Physics portal Astronomy portal.

Retrieved 18 April May Einstein's original papers are found in Digital Einstein , volumes 4 and 6. An early key article is Einstein , cf.

Pais , ch. The publication featuring the field equations is Einstein , cf. Einstein's condemnation would prove to be premature, cf.

It is more. Retrieved 9 April For the experimental evidence, cf. The Einstein tensor is the only divergence-free tensor that is a function of the metric coefficients, their first and second derivatives at most, and allows the spacetime of special relativity as a solution in the absence of sources of gravity, cf.

Lovelock The fact that, as a consequence of geometric relations known as Bianchi identities , the Einstein tensor satisfies a further four identities reduces these to six independent equations, e. Schutz , sec. John Wiley. ISBN Relativity, Gravitation and Cosmology: a Basic Introduction.

Stephani et al. Einstein derived these effects using the equivalence principle as early as , cf. Einstein and the description in Pais , pp. Kennefick for the classic early measurements by Arthur Eddington's expeditions.

For the most precise direct modern observations using quasars, cf. Shapiro et al. Ehlers , sec. Such calculations tacitly assume that the geometry of space is Euclidean , cf. Rindler , sec. Shapiro , Weinberg , ch. Stairs , sec. Bibcode : SPAW Archived from the original on 21 March Retrieved 12 February Nature News.

S2CID Retrieved 11 February Abbott; et al. Physical Review Letters. Bibcode : PhRvL. PMID Schutz , ch. Will , sec. London: Routledge. Retrieved 23 April Buras et al. Font , sec. Also, relativistic lensing effects are thought to play a role for the signals received from X-ray pulsars , cf. Remillard et al. Observations of the "shadow" of the Milky Way galaxy's central black hole horizon are eagerly sought for, cf. Pais , pp. Peebles et al. Future measurements could also reveal evidence about gravitational waves in the early universe; this additional information is contained in the background radiation's polarization , cf.

Peebles , ch. Peacock , sec. Peacock , ch. Here, too, scientists have argued that the evidence indicates not a new form of energy, but the need for modifications in our cosmological models, cf. Mannheim , sec. Waves from axisymmetric isolated systems". Proceedings of the Royal Society of London A.

A : 21— Physical Review. Bibcode : PhRv.. It contains a pedagogical overview of recent developments connecting the subjects of soft theorems, the memory effect and asymptotic symmetries in four-dimensional QED, nonabelian gauge theory and gravity with applications to black holes. To be published Princeton University Press, pages. Sign Up. A text message with your code has been sent to:.

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