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Theory of quantum gravity merging quantum mechanics and general relativity
Loop quantum gravity (LQG) is a theory of quantum gravity that incorporates matter of the Standard Model into the framework established for the intrinsic
Loop_quantum_gravity
Description of gravity using discrete values
Quantum gravity (QG) is a field of theoretical physics that seeks unification of the theory of gravity with the principles of quantum mechanics. It deals
Quantum_gravity
Aspect of loop quantum gravity
Lorentz transformation. In quantum gravity, Lorentz invariance measures the universal features in the hypothetical loop quantum gravity universes; which is a
Lorentz invariance in loop quantum gravity
Lorentz_invariance_in_loop_quantum_gravity
Formulation of general relativity
Hartle–Hawking state, Regge calculus, the Wheeler–DeWitt equation and loop quantum gravity. In the Hamiltonian formulation of ordinary classical mechanics the
Canonical_quantum_gravity
Finite, symmetry-reduced model of loop quantum gravity
Loop quantum cosmology (LQC) is a finite, symmetry-reduced model of loop quantum gravity (LQG) that predicts a "quantum bridge" between contracting and
Loop_quantum_cosmology
This is a list of notable researchers in the physics field of loop quantum gravity. Abhay Ashtekar, Pennsylvania State University, United States John Baez
List of loop quantum gravity researchers
List_of_loop_quantum_gravity_researchers
Model for the origin of the universe
diverse support in works based on loop quantum gravity. In loop quantum cosmology, a branch of loop quantum gravity, the big bounce was first discovered
Big_Bounce
Aspect of astrophysics history
The history of loop quantum gravity spans more than three decades of intense research. General relativity is the theory of gravitation published by Albert
History of loop quantum gravity
History_of_loop_quantum_gravity
Idea in quantum gravity
Induced gravity (or emergent gravity) is an idea in quantum gravity that spacetime curvature and its dynamics emerge as a mean field approximation of
Induced_gravity
Attempts to develop a quantum mechanical theory of cosmology
relativity theory and quantum theory. Such an approach is attempted for instance with loop quantum cosmology, loop quantum gravity, string theory and causal
Quantum_cosmology
Concept of universality in physical science
process in string theory. A very different approach to quantum gravity called loop quantum gravity is fully non-perturbative and manifestly background-independent:
Background_independence
Hypothetical approach to quantum gravity with emergent spacetime
Jan Ambjørn and Jerzy Jurkiewicz, is an approach to quantum gravity that, like loop quantum gravity, is background independent. This means that it does
Causal dynamical triangulation
Causal_dynamical_triangulation
Topological structure in loop quantum gravity
of quantum gravity. These structures are employed in loop quantum gravity as a version of quantum foam. The covariant formulation of loop quantum gravity
Spin_foam
Term in general relativity
In general relativity and quantum gravity, the Gibbons–Hawking–York boundary term is a term that needs to be added to the Einstein–Hilbert action when
Gibbons–Hawking–York boundary term
Gibbons–Hawking–York_boundary_term
Theories trying to extend known physics
direction are supersymmetry, loop quantum gravity, and String theory. Theories of quantum gravity such as loop quantum gravity and others are thought by
Physics beyond the Standard Model
Physics_beyond_the_Standard_Model
Theory of gravitation as curved spacetime
(2000). "Notes for a brief history of quantum gravity". arXiv:gr-qc/0006061. Rovelli, Carlo (1998), "Loop Quantum Gravity", Living Reviews in Relativity, 1
General_relativity
Hypothetical quantum cosmological effect
~10−26 s. A detailed study of the quantum geometry of a black hole event horizon has been made using loop quantum gravity. Loop-quantization does not reproduce
Hawking_radiation
Description of gauge theories using loop operators
allowed one to apply loop techniques as a natural nonperturbative description of Einstein's theory. In canonical quantum gravity the difficulties in using
Loop representation in gauge theories and quantum gravity
Loop_representation_in_gauge_theories_and_quantum_gravity
Theory of quantum gravity
previous approaches to quantum gravity such as loop quantum gravity, is that it uses concepts from condensed matter physics such as quantum critical phenomena
Hořava–Lifshitz_gravity
Theory extending Einstein gravity
non-perturbative ultraviolet fixed point. Unitarity, essential to a theory of quantum gravity, has been established in appropriate constructions, where the appropriate
Quadratic_gravity
Theory in modern physics that describes gravity as an entropic force
cosmological inflation, and loop quantum gravity. Also, a specific microscopic model has been proposed that indeed leads to entropic gravity emerging at large scales
Entropic_gravity
Approach to quantum gravity utilizing Wick rotations
physics, Euclidean quantum gravity is a version of quantum gravity. It seeks to use the Wick rotation to describe the force of gravity according to the
Euclidean_quantum_gravity
Hypothetical physical concept
research on loop quantum gravity may eventually play a fundamental role in a theory of everything, but that is not its primary aim. Loop quantum gravity also
Theory_of_everything
Indian-American theoretical physicist
development of loop quantum gravity. He has contributed extensively to loop quantum gravity and its cosmological application, loop quantum cosmology. His
Abhay_Ashtekar
Puzzle of disappearance of information in a black hole
evaporation requires a complete theory of quantum gravity. Within what might be termed the loop-quantum-gravity approach to black holes, it is believed
Black hole information paradox
Black_hole_information_paradox
Classical theory of gravitation
theory gravity Loop quantum gravity Cabral, Francisco; Lobo, Francisco S. N.; Rubiera-Garcia, Diego (December 2019). "Einstein–Cartan–Dirac gravity with
Einstein–Cartan_theory
Study of subatomic particles and forces
reconciliation of gravity to the current particle physics theory is not solved; many theories have addressed this problem, such as loop quantum gravity, string
Particle_physics
triangulations approach to quantum gravity. Augusto Sagnotti: the physicist who demonstrated that perturbative quantum gravity diverges at two loops, and made a number
List of quantum gravity researchers
List_of_quantum_gravity_researchers
Theory of subatomic structure
the graviton, a quantum mechanical particle that carries the gravitational force. Thus, string theory is a theory of quantum gravity. String theory is
String_theory
Set of mathematical concepts in quantum gravity
In quantum gravity, quantum geometry is the set of mathematical concepts that generalize geometry to describe physical phenomena at distance scales comparable
Quantum_geometry
Theory of rapid universe expansion
When investigating the effects the theory of loop quantum gravity would have on cosmology, a loop quantum cosmology model has evolved that provides a possible
Cosmic_inflation
Theories of higher-dimensional general relativity
behavior of black holes in higher dimensions, and the unification of gravity with quantum field theory. The higher-dimensional generalization of the Kerr metric
Higher-dimensional Einstein gravity
Higher-dimensional_Einstein_gravity
Physical theory with matter as quantum fields but gravity as a classical field
Semiclassical gravity is an approximation to the theory of quantum gravity in which one treats matter and energy fields as being quantum and the gravitational
Semiclassical_gravity
American theoretical physicist (born 1955)
to quantum gravity theory, in particular the approach known as loop quantum gravity. He advocates that the two primary approaches to quantum gravity, loop
Lee_Smolin
Most basic type of physical force
GUTs with a quantum gravity theory, faces a greater barrier because no quantum gravity theory (e.g., string theory, loop quantum gravity, and twistor
Fundamental_interaction
Italian theoretical physicist and writer (born 1956)
States. Rovelli works mainly in the field of quantum gravity and is a founder of the theory of loop quantum gravity. He has also worked in the history and philosophy
Carlo_Rovelli
Attraction of masses and energy
looking for a theory that describes gravity in the framework of quantum mechanics (quantum gravity), which would unify gravity and the other known fundamental
Gravity
Philosophical argument against general covariance
resolution as "beyond my wildest expectations." Loop quantum gravity (LQG) is an approach to quantum gravity which attempts to marry the fundamental principles
Hole_argument
Hypothetical phenomenon
hypothesis, gravitational singularities may not be observable. If loop quantum gravity is correct, naked singularities may be possible in nature. When a
Naked_singularity
Condition in which spacetime itself breaks down
defined by "where" or "when". Some theories, such as the theory of loop quantum gravity, suggest that singularities may not exist. This is also true for
Gravitational_singularity
Idea of connecting all of physics into one set of equations
current leading candidates are M-theory, superstring theory and loop quantum gravity. Attempts to "unify" the known fundamental interactions continues
Unification of theories in physics
Unification_of_theories_in_physics
American mathematical physicist (b. 1961)
Riverside (UCR) in Riverside, California. He has worked on spin foams in loop quantum gravity, applications of higher categories to physics, and applied category
John_C._Baez
be a product of a discrete structure of spacetime itself (as in loop quantum gravity)? Are there deviations from the predictions of general relativity
List of unsolved problems in physics
List_of_unsolved_problems_in_physics
particle physics. Efforts to describe gravity using the same techniques have, to date, failed. The study of quantum field theory is still flourishing, as
History of quantum field theory
History_of_quantum_field_theory
Classical statement of gravity as force
Newton's law of universal gravitation describes gravity as a force by stating that every particle attracts every other particle in the universe with a
Newton's law of universal gravitation
Newton's_law_of_universal_gravitation
Topics referred to by the same term
refer to: Loop quantum gravity, a theory that aims to merge quantum mechanics and general relativity Liouville quantum gravity, a theory of gravity on two-dimensional
LQG
Numerical coefficient in loop quantum gravity
appearing in loop quantum gravity (LQG), a nonperturbative theory of quantum gravity. The Immirzi parameter measures the size of the quantum of area in
Immirzi_parameter
Non-fiction book by American theoretical physicist Lee Smolin
include string theory, M-theory, and Smolin's preferred approach, loop quantum gravity. Smolin suggests that these approaches may be approximations of a
Three Roads to Quantum Gravity
Three_Roads_to_Quantum_Gravity
Description of physical properties at the atomic and subatomic scale
graviton, a quantum mechanical particle that carries gravitational force. Another popular theory is loop quantum gravity (LQG), which describes quantum properties
Quantum_mechanics
Time period of seeming infinite density just after the Big Bang
proposed as a result of the problems created by quantum mechanics. One model, using loop quantum gravity, aims to explain the beginnings of the universe
Initial_singularity
Quantum field theory with a Lie group base manifold
related to background independent quantum gravity approaches such as loop quantum gravity, the spin foam formalism and causal dynamical triangulation. Its
Group_field_theory
Physics generalization
into quantum mechanical systems. It emerges from several approaches to quantum gravity, including string theory, loop quantum gravity, and quantum geometry
Generalized uncertainty principle
Generalized_uncertainty_principle
Attempt to find a consistent theory of quantum gravity
sets Critical phenomena Euclidean quantum gravity Fractal cosmology Functional renormalization group Loop quantum gravity Perturbative renormalization Planck
Asymptotic_safety
Zero energy solution to the Schrödinger equation in loop quantum gravity
The Kodama state in physics for loop quantum gravity, is a zero energy solution to the Schrödinger equation (a linear partial differential equation that
Kodama_state
timeline of quantum computing Lie superalgebra supergroup (physics) supercharge supermultiplet supergravity theory of everything loop quantum gravity spin network
List of mathematical topics in quantum theory
List_of_mathematical_topics_in_quantum_theory
2017 book by Carlo Rovelli
into three sections, covering the theory of relativity, space-time, loop quantum gravity, and thermodynamics. The first section, The Crumbling of Time, opens
The_Order_of_Time_(book)
Modern theory of gravitation that combines supersymmetry and general relativity
theory makes gravity arise in a natural way. Like all covariant approaches to quantum gravity, supergravity contains a spin-2 field whose quantum is the graviton
Supergravity
Continuous progression from past to future
this scale exist; an example is loop quantum gravity. Loop quantum gravity suggests that time is quantized; if gravity is quantized, spacetime is also
Time
Model of gravity with dilation
Claudio Teitelboim. The theory is notable for being a toy model of quantum gravity that is exactly solvable, and it has found applications in understanding
Jackiw–Teitelboim_gravity
Hypothetical astronomical object
In loop quantum gravity theory, a Planck star is a hypothetical astronomical object, theorized as a compact, exotic star, that exists within a black hole's
Planck_star
Linear perturbations to solutions of nonlinear Einstein field equations
gravity is the application of perturbation theory to the metric tensor that describes the geometry of spacetime. As a consequence, linearized gravity
Linearized_gravity
Compact astronomical body
actually made up of quantum microstates and need not have a singularity or an event horizon. The theory of loop quantum gravity proposes that the curvature
Black_hole
Key constraint in some theories admitting Hamiltonian formulations
reformulation. This led to the loop representation of quantum general relativity and in turn loop quantum gravity. Within the loop representation, Thiemann
Hamiltonian_constraint
Classical field theory describing gravitation
generalized Einstein–Cartan–Kibble–Sciama gravity using weak deflection angle and shadow cast", Classical and Quantum Gravity, 37 (22), arXiv:2005.00982, Bibcode:2020CQGra
Poincaré_gauge_theory
Fluctuation of spacetime on very small scales
principle Loop quantum gravity Lorentzian wormhole Planck time Stochastic quantum mechanics String theory Wormhole Virtual black hole Quantum Foam, Don
Quantum_foam
Diagram used to represent quantum field theory calculations
invariant under local gauge transformations. In loop quantum gravity (LQG), a spin network represents a "quantum state" of the gravitational field on a 3-dimensional
Spin_network
Restatement of Newton's law of universal gravitation
In physics, Gauss's law for gravity, also known as Gauss's flux theorem for gravity, is a law of physics that is equivalent to Newton's law of universal
Gauss's_law_for_gravity
Nonpertubative field theoretic approach to quantum gravity
safety approach to quantum gravity provides a nonperturbative notion of renormalization in order to find a consistent and predictive quantum field theory of
Physics applications of asymptotically safe gravity
Physics_applications_of_asymptotically_safe_gravity
Hypothetical elementary particle that mediates gravity
theories of quantum gravity, the graviton is the hypothetical elementary particle that mediates the force of gravitational interaction. It is a quantum of gravitational
Graviton
Gravity filtration is a method of filtering impurities from solutions by using gravity to pull liquid through a filter. The two main kinds of filtration
Gravity_filtration
Conceptual conflict between general relativity and quantum mechanics
objective passage of time. Motivated by the Immirzi ambiguity in loop quantum gravity and the near-conformal invariance of the standard model of elementary
Problem_of_time
Condensed matter physics model involving only closed loops
studied in loop quantum gravity. This has led to the proposal by Levin and Wen, and Smolin, Markopoulou and Konopka that loop quantum gravity's spin networks
String-net_liquid
Philosophical view that there is no correct way of perceiving the passage of time
Strata-cut animation Le Bihan, Baptiste (2020). "String theory, loop quantum gravity and eternalism". European Journal for Philosophy of Science. 10 (2)
Eternalism (philosophy of time)
Eternalism_(philosophy_of_time)
Hypothetical particle
(1996). "Canonical reduction of two-dimensional gravity for particle dynamics". Classical and Quantum Gravity. 13 (9): 2585–2602. arXiv:gr-qc/9605004. Bibcode:1996CQGra
Dilaton
Extension of quantum field theory to curved spacetime
which gravity is strong enough to influence (quantum) matter, yet not strong enough to require quantization itself, physicists have formulated quantum field
Quantum field theory in curved spacetime
Quantum_field_theory_in_curved_spacetime
Constraint in loop quantum gravity
This led to the loop representation of quantum general relativity and in turn loop quantum gravity. Within the loop quantum gravity representation Thomas
Hamiltonian_constraint_of_LQG
Theory of gravity
functional forms may be inspired by corrections arising from a quantum theory of gravity. f(R) gravity was first proposed in 1970 by Hans Adolph Buchdahl (although
F(R)_gravity
Configuration space in quantum theory
Foundations of Quantum Field Theory By Tian Yu Cao A. Ashtekar and J. Lewandowski, Background independent quantum gravity: A status report, Class. Quantum Grav
Quantum_configuration_space
Candidate "Theory of Everything"
other theories such as loop quantum gravity are considered by physicists and researchers to be less elegant, because they posit gravity to be completely different
Introduction_to_M-theory
Italian theoretical physicist
assistant professor at the Pennsylvania State University who works on loop quantum gravity and black hole thermodynamics. He has derived the Bekenstein-Hawking
Eugenio_Bianchi
French physicist and philosopher
behavior of the Universe around the Big Bang. He worked on both loop quantum gravity and string theory. He is involved in scientific popularization, collaborates
Aurélien_Barrau
Gravity theories that are invariant under Weyl transformations
conformal gravity theories, as well as any theory with higher derivatives, is the typical presence of ghosts, which point to instabilities of the quantum version
Conformal_gravity
Physics theory
relativity and quantum mechanics. Scientists are currently attempting to detect rainbow gravity using the Large Hadron Collider. Rainbow gravity theory's origin
Rainbow_gravity_theory
Mexican physicist
approach known as Loop quantum gravity and to loop quantum cosmology. Profile and research at the UNAM site. Abstract of an article on Loop Quantization of
Alejandro_Corichi
Proposed theories of gravity
of gravity. These attempts can be split into four broad categories based on their scope: Classical theories of gravity, which do not involve quantum mechanics
Alternatives to general relativity
Alternatives_to_general_relativity
has developed into a broad and varied subject with connections to quantum gravity, particle and condensed matter physics, cosmology, and pure mathematics
History_of_string_theory
Female Italian theoretical physicist
Philosophy. Her research explores the quantum aspects of the gravitational field, in the framework of Loop Quantum Gravity. Her work covers topics from the
Francesca_Vidotto
Theory of fundamental physics
unify quantum mechanics (which describes three of the four known fundamental interactions) with gravity, making SVT a derivative of quantum gravity and
Superfluid_vacuum_theory
German theoretical physicist (born 1977)
physicist known for her contributions to loop quantum gravity and the spin foam approach to quantum gravity. She has been a faculty member at Perimeter
Bianca_Dittrich_(physicist)
2002 science fiction novel by Australian author Greg Egan
within spacetime. Quantum Graph Theory (QGT) is a fictional improvement of the real theory of Loop Quantum Gravity (LQG), with quantum graphs in the former
Schild's_Ladder
Fringe theory of physics
attention. Lisi made a further presentation for the International Loop Quantum Gravity Seminar on November 13, 2007, and responded to press inquiries on
An Exceptionally Simple Theory of Everything
An_Exceptionally_Simple_Theory_of_Everything
Region in spacetime from which nothing can escape
gravity is expected to, at minimum, require a theory of quantum gravity. One such candidate theory is M-theory. Another such candidate theory is loop
Event_horizon
Theory of gravity in which the graviton has nonzero mass
In theoretical physics, massive gravity is a theory of gravity that modifies general relativity by endowing the graviton with a nonzero mass. In the classical
Massive_gravity
Theory proposed by Roger Penrose
non-commutative holomorphic twistor quantum algebra.) Background independence Complex spacetime History of loop quantum gravity Robinson congruences Spin network
Twistor_theory
Theory of gravity
of shape dynamics is the absence of a problem of time in canonical quantum gravity. The replacement of the spacetime picture with a picture of evolving
Shape_dynamics
Variables used in general relativity
relativity, which led to the loop representation of quantum general relativity and in turn loop quantum gravity and quantum holonomy theory. Let us introduce
Ashtekar_variables
Category of theories
of scientific theories in the field of physics that are non-quantum or both non-quantum and non-relativistic, depending on the context. In historical
Classical_physics
Unified field theory
Available online in Blum, Alexander S.; Rickles, Dean (July 2018). Quantum Gravity in the First Half of the Twentieth Century: A Sourcebook. Berlin:
Kaluza–Klein_theory
Class of models of gravitation treating gravitons as composite particles
In theoretical physics, composite gravity refers to models that attempted to derive general relativity in a framework where the graviton is constructed
Composite_gravity
Truths and principles of the study of matter, space, time and energy
theories such as loop quantum gravity claim that spacetime is emergent. As Carlo Rovelli, one of the founders of loop quantum gravity, has said: "No more
Philosophy_of_physics
LOOP QUANTUM-GRAVITY
LOOP QUANTUM-GRAVITY
Boy/Male
Hindu, Indian
Calm
Surname or Lastname
English (Somerset)
English (Somerset) : habitational name from Look in Puncknowle, Dorset, named in Old English with lūce ‘enclosure’.English : possibly a variant of Luck 3.Northern English and Scottish : from a vernacular pet form of Lucas.Dutch (van Look) : topographic name from look ‘enclosure’ or habitational name from a place named with this word.Thomas Look (b. c. 1622) was in Lynn, MA, by 1646. His son, also called Thomas (b. 1646), moved to Martha’s Vineyard about 1670.
Girl/Female
Tamil
Look, Blessed with beauty, Shape, Beauty
Boy/Male
Latin Biblical
Born fourth.
Boy/Male
Dutch, German, Hebrew
God will Multiply; God will Add
Girl/Female
Biblical
Fourth.
Surname or Lastname
English
English : metonymic occupational name for a cooper, from Middle English coupe ‘tub’, ‘container’ (see Cooper). In some cases the surname may have been derived from a pub or house sign.Dutch : from koop ‘purchase’, ‘bargain’, hence a nickname for a haggler or a metonymic occupational name for a merchant.
Biblical
fourth
Surname or Lastname
North German
North German : habitational name from any of several places called Loose or Loosey.North German : from a short form of Nikolaus, German form of Nicholas.Dutch : nickname from the adjective loos ‘cunning’, ‘artful’, ‘guileful’.English : variant spelling of Loose.
Male
French
French form of Latin Lupus, LOUP means "wolf."
Girl/Female
Hindu
Look, Blessed with beauty, Shape, Beauty
Boy/Male
Hindu, Indian, Rajasthani, Sindhi, Traditional
Look; Beauty; Appearance
Male
Dutch
, Jehovah's gift (or grace).
Boy/Male
Hebrew
God will multiply.
Boy/Male
British, English
Barrel Maker
Boy/Male
Arabic
The Biblical Lot is the English Language Equivalent
Surname or Lastname
English
English : possibly from the Old Norse personal name Tópi, Túpi, a short form of a personal name formed with þórr, name of the Norse god of thunder (see Thor) + a second element with initial b-, for example björn ‘bear’, ‘warrior’. On the other hand, the name is found mainly in Dorset and Devon, which are far from areas of Scandinavian settlement.
Surname or Lastname
Dutch
Dutch : from a short form of the Germanic personal name Robrecht.Altered spelling of German Rupp.English : variant spelling of Roope.
Boy/Male
Danish, Finnish, French, German, Latin, Shakespearean, Swedish
Born Fifth
Boy/Male
Bengali, Indian
Loop; Autumn
LOOP QUANTUM-GRAVITY
LOOP QUANTUM-GRAVITY
Girl/Female
Arabic, Australian, Muslim
With Beautiful Curls
Female
Norse
Old Norse name composed of the elements hjörr "sword" and dis "goddess," hence "sword goddess."
Girl/Female
Arabic, Farsi, Iranian, Muslim
Precious; Expensive
Boy/Male
Hindu
The meaning of name is gods name
Girl/Female
Hindu, Indian
Intelligent or Name of Lord Lakshmi
Boy/Male
Indian
Little leopard
Male
Chinese
people's hero.
Girl/Female
Spanish American
Help.
Boy/Male
Muslim
Example
Female
Egyptian
, Amunta.
LOOP QUANTUM-GRAVITY
LOOP QUANTUM-GRAVITY
LOOP QUANTUM-GRAVITY
LOOP QUANTUM-GRAVITY
LOOP QUANTUM-GRAVITY
v. t.
To beat in the game of loo by winning every trick.
n.
A curve of any kind in the form of a loop.
v. t.
To let hang down; as, to lop the head.
n.
Expression of the eyes and face; manner; as, a proud or defiant look.
v. i.
To seem; to appear; to have a particular appearance; as, the patient looks better; the clouds look rainy.
n.
Quantity; amount.
v. t.
To look at; to turn the eyes toward.
v. t.
To make a loop of or in; to fasten with a loop or loops; -- often with up; as, to loop a string; to loop up a curtain.
n.
A ring; a circular band; anything resembling a hoop, as the cylinder (cheese hoop) in which the curd is pressed in making cheese.
v. t.
To influence, overawe, or subdue by looks or presence as, to look down opposition.
v. t.
To break over the poop or stern, as a wave.
v. t.
To express or manifest by a look.
n.
See Loon, the bird.
n.
See 1st Loop.
v. t.
To bind or fasten with hoops; as, to hoop a barrel or puncheon.
n.
Hence; Appearance; aspect; as, the house has a gloomy look; the affair has a bad look.
n.
A definite portion of a manifoldness, limited by a mark or by a boundary.
v. i.
To direct the attention (to something); to consider; to examine; as, to look at an action.
pl.
of Quantum
pl.
of Trou-de-loup