text stringlengths 559 401k | source stringlengths 13 121 |
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In particle physics, the electroweak interaction or electroweak force is the unified description of two of the fundamental interactions of nature: electromagnetism (electromagnetic interaction) and the weak interaction. Although these two forces appear very different at everyday low energies, the theory models them as ... | Wikipedia/Electroweak_force |
The history of science covers the development of science from ancient times to the present. It encompasses all three major branches of science: natural, social, and formal. Protoscience, early sciences, and natural philosophies such as alchemy and astrology that existed during the Bronze Age, Iron Age, classical antiqu... | Wikipedia/Medieval_science |
In economics, comparative statics is the comparison of two different economic outcomes, before and after a change in some underlying exogenous parameter.
As a type of static analysis it compares two different equilibrium states, after the process of adjustment (if any). It does not study the motion towards equilibrium... | Wikipedia/Comparative_statics |
In physics and mechanics, torque is the rotational analogue of linear force. It is also referred to as the moment of force (also abbreviated to moment). The symbol for torque is typically
τ
{\displaystyle {\boldsymbol {\tau }}}
, the lowercase Greek letter ... | Wikipedia/Moment_of_force |
Varignon's theorem is a theorem of French mathematician Pierre Varignon (1654–1722), published in 1687 in his book Projet d'une nouvelle mécanique. The theorem states that the torque of a resultant of two concurrent forces about any point is equal to the algebraic sum of the torques of its components about the same poi... | Wikipedia/Varignon's_theorem_(mechanics) |
In theoretical physics, the matrix theory is a quantum mechanical model proposed in 1997 by Tom Banks, Willy Fischler, Stephen Shenker, and Leonard Susskind; it is also known as BFSS matrix model, after the authors' initials.
== Overview ==
This theory describes the behavior of a set of nine large matrices. In their ... | Wikipedia/BFSS_matrix_model |
In physics, two objects are said to be coupled when they are interacting with each other. In classical mechanics, coupling is a connection between two oscillating systems, such as pendulums connected by a spring. The connection affects the oscillatory pattern of both objects. In particle physics, two particles are coup... | Wikipedia/Coupling_(physics) |
In theoretical physics, supergravity (supergravity theory; SUGRA for short) is a modern field theory that combines the principles of supersymmetry and general relativity; this is in contrast to non-gravitational supersymmetric theories such as the Minimal Supersymmetric Standard Model. Supergravity is the gauge theory ... | Wikipedia/Supergravity_theory |
In theoretical physics, type II string theory is a unified term that includes both type IIA strings and type IIB strings theories. Type II string theory accounts for two of the five consistent superstring theories in ten dimensions. Both theories have
N
... | Wikipedia/Type_IIB_string_theory |
In mathematics, an integral is the continuous analog of a sum, which is used to calculate areas, volumes, and their generalizations. Integration, the process of computing an integral, is one of the two fundamental operations of calculus, the other being differentiation. Integration was initially used to solve problems ... | Wikipedia/Integral_(calculus) |
In mathematics, a function space is a set of functions between two fixed sets. Often, the domain and/or codomain will have additional structure which is inherited by the function space. For example, the set of functions from any set X into a vector space has a natural vector space structure given by pointwise addition ... | Wikipedia/Functional_space |
In physics, Lagrangian mechanics is a formulation of classical mechanics founded on the d'Alembert principle of virtual work. It was introduced by the Italian-French mathematician and astronomer Joseph-Louis Lagrange in his presentation to the Turin Academy of Science in 1760 culminating in his 1788 grand opus, Mécaniq... | Wikipedia/Lagrangian_(physics) |
In theoretical physics, relativistic Lagrangian mechanics is Lagrangian mechanics applied in the context of special relativity and general relativity.
== Introduction ==
The relativistic Lagrangian can be derived in relativistic mechanics to be of the form:
L
=
−
... | Wikipedia/Relativistic_Lagrangian_mechanics |
In physics, a homogeneous material or system has the same properties at every point; it is uniform without irregularities. A uniform electric field (which has the same strength and the same direction at each point) would be compatible with homogeneity (all points experience the same physics). A material constructed wit... | Wikipedia/Homogeneity_(physics) |
In particle physics, flavour or flavor refers to the species of an elementary particle. The Standard Model counts six flavours of quarks and six flavours of leptons. They are conventionally parameterized with flavour quantum numbers that are assigned to all subatomic particles. They can also be described by some of the... | Wikipedia/Flavor_(physics) |
The Philosophy of Science Association (PSA) is an international academic organization founded in 1933 that promotes research, teaching, and free discussion of issues in the philosophy of science from diverse standpoints. The PSA engages in activities such as the publishing of periodicals, essays and monographs in the f... | Wikipedia/Philosophy_of_Science_Association |
In mathematical physics, inversion transformations are a natural extension of Poincaré transformations to include all conformal, one-to-one transformations on coordinate space-time. They are less studied in physics because, unlike the rotations and translations of Poincaré symmetry, an object cannot be physically trans... | Wikipedia/Inversion_transformations |
Causal perturbation theory is a mathematically rigorous approach to renormalization theory, which makes it possible to put the theoretical setup of perturbative quantum field theory on a sound mathematical basis. It goes back to a 1973 work by Henri Epstein and Vladimir Jurko Glaser.
== Overview ==
When developing qu... | Wikipedia/Causal_perturbation_theory |
A Van der Waals molecule is a weakly bound complex of atoms or molecules held together by intermolecular attractions such as Van der Waals forces or by hydrogen bonds.
The name originated in the beginning of the 1970s when stable molecular clusters were regularly observed in molecular beam microwave spectroscopy.
==... | Wikipedia/Van_der_Waals_molecule |
Classical mechanics is a physical theory describing the motion of objects such as projectiles, parts of machinery, spacecraft, planets, stars, and galaxies. The development of classical mechanics involved substantial change in the methods and philosophy of physics. The qualifier classical distinguishes this type of mec... | Wikipedia/Kinetics_(dynamics) |
An intermolecular force (IMF; also secondary force) is the force that mediates interaction between molecules, including the electromagnetic forces of attraction
or repulsion which act between atoms and other types of neighbouring particles (e.g. atoms or ions). Intermolecular forces are weak relative to intramolecular ... | Wikipedia/Intermolecular_force |
Physical Chemistry Chemical Physics is a weekly peer-reviewed scientific journal publishing research and review articles on any aspect of physical chemistry, chemical physics, and biophysical chemistry. It is published by the Royal Society of Chemistry on behalf of eighteen participating societies. The editor-in-chief ... | Wikipedia/Physical_Chemistry_Chemical_Physics |
In physics, helicity is the projection of the spin onto the direction of momentum.
Mathematically, helicity is the sign of the projection of the spin vector onto the momentum vector: "left" is negative, "right" is positive.
== Overview ==
The angular momentum J is the sum of an orbital angular momentum L and a spin S... | Wikipedia/Helicity_(particle_physics) |
The Schrödinger equation is a partial differential equation that governs the wave function of a non-relativistic quantum-mechanical system.: 1–2 Its discovery was a significant landmark in the development of quantum mechanics. It is named after Erwin Schrödinger, an Austrian physicist, who postulated the equation in 1... | Wikipedia/Schrödinger_Equation |
The plum pudding model is an obsolete scientific model of the atom. It was first proposed by J. J. Thomson in 1904 following his discovery of the electron in 1897, and was rendered obsolete by Ernest Rutherford's discovery of the atomic nucleus in 1911. The model tried to account for two properties of atoms then known:... | Wikipedia/Plum_pudding_model |
The chronology protection conjecture is a hypothesis first proposed by Stephen Hawking that laws of physics beyond those of standard general relativity prevent time travel—even when the latter theory states that it should be possible (such as in scenarios where faster than light travel is allowed). The permissibility ... | Wikipedia/Chronology_protection_conjecture |
What is now often called Lorentz ether theory (LET) has its roots in Hendrik Lorentz's "theory of electrons", which marked the end of the development of the classical aether theories at the end of the 19th and at the beginning of the 20th century.
Lorentz's initial theory was created between 1892 and 1895 and was based... | Wikipedia/Lorentz_ether_theory |
In the history of physics, a line of force in Michael Faraday's extended sense is synonymous with James Clerk Maxwell's line of induction. According to J.J. Thomson, Faraday usually discusses lines of force as chains of polarized particles in a dielectric, yet sometimes Faraday discusses them as having an existence all... | Wikipedia/Lines_of_force |
Kinetic exchange models are multi-agent dynamic models inspired by the statistical physics of energy distribution, which try to explain the robust and universal features of income/wealth distributions.
Understanding the distributions of income and wealth in an economy has been a classic problem in economics for more th... | Wikipedia/Kinetic_exchange_models_of_markets |
The Wheeler–Feynman absorber theory (also called the Wheeler–Feynman time-symmetric theory), named after its originators, the physicists Richard Feynman and John Archibald Wheeler, is a theory of electrodynamics based on a relativistic correct extension of action at a distance electron particles. The theory postulates ... | Wikipedia/Wheeler–Feynman_time-symmetric_theory |
The theoretical study of time travel generally follows the laws of general relativity. Quantum mechanics requires physicists to solve equations describing how probabilities behave along closed timelike curves (CTCs), which are theoretical loops in spacetime that might make it possible to travel through time.
In the 198... | Wikipedia/Quantum_mechanics_of_time_travel |
This timeline lists significant discoveries in physics and the laws of nature, including experimental discoveries, theoretical proposals that were confirmed experimentally, and theories that have significantly influenced current thinking in modern physics. Such discoveries are often a multi-step, multi-person process. ... | Wikipedia/Timeline_of_developments_in_theoretical_physics |
Double field theory in theoretical physics refers to formalisms that capture the T-duality property of string theory as a manifest symmetry of a field theory.
== Background ==
In double field theory, the T-duality transformation of exchanging momentum and winding modes of closed strings on toroidal backgrounds transl... | Wikipedia/Double_field_theory |
In Scotland, the Industrial Revolution was the transition to new manufacturing processes and economic expansion between the mid-eighteenth century and the late nineteenth century. By the start of the eighteenth century, a political union between Scotland and England became politically and economically attractive, promi... | Wikipedia/Industrial_Revolution_in_Scotland |
The 1970s energy crisis occurred when the Western world, particularly the United States, Canada, Western Europe, Australia, and New Zealand, faced substantial petroleum shortages as well as elevated prices. The two worst crises of this period were the 1973 oil crisis and the 1979 energy crisis, when, respectively, the ... | Wikipedia/1970s_energy_crisis |
Textile manufacture during the British Industrial Revolution was centred in south Lancashire and the towns on both sides of the Pennines in the United Kingdom. The main drivers of the Industrial Revolution were textile manufacturing, iron founding, steam power, oil drilling, the discovery of electricity and its many in... | Wikipedia/Textile_manufacture_during_the_British_Industrial_Revolution |
Industrial archaeology (IA) is the systematic study of material evidence associated with the industrial past. This evidence, collectively referred to as industrial heritage, includes buildings, machinery, artifacts, sites, infrastructure, documents and other items associated with the production, manufacture, extraction... | Wikipedia/Industrial_archaeology |
In macroeconomics, the workforce or labour force is the sum of people either working (i.e., the employed) or looking for work (i.e., the unemployed):
Labour force
=
Employed
+
Unemployed
{... | Wikipedia/Workforce |
British industrial architecture has been created, mainly from 1700 onwards, to house industries of many kinds in Britain, home of the Industrial Revolution in this period. Both the new industrial technologies and industrial architecture soon spread worldwide. As such, the architecture of surviving industrial buildings ... | Wikipedia/British_industrial_architecture |
The production of renewable energy in Scotland is a topic that came to the fore in technical, economic, and political terms during the opening years of the 21st century. The natural resource base for renewable energy is high by European, and even global standards, with the most important potential sources being wind, w... | Wikipedia/Renewable_energy_in_Scotland |
In Karl Marx's critique of political economy and subsequent Marxian analyses, the capitalist mode of production (German: Produktionsweise) refers to the systems of organizing production and distribution within capitalist societies. Private money-making in various forms (renting, banking, merchant trade, production for ... | Wikipedia/Capitalist_mode_of_production_(Marxist_theory) |
The demography of England has since 1801 been measured by the decennial national census, and is marked by centuries of population growth and urbanization. Due to the lack of authoritative contemporary sources, estimates of the population of England for dates prior to the first census in 1801 vary considerably. The popu... | Wikipedia/Demographics_of_England |
Industrial warfare is a period in the history of warfare ranging roughly from the early 19th century and the start of the Industrial Revolution to the beginning of the Atomic Age, which saw the rise of nation-states, capable of creating and equipping large armies, navies, and air forces, through the process of industri... | Wikipedia/Industrial_warfare |
Industrial waste is the waste produced by industrial activity which includes any material that is rendered useless during a manufacturing process such as that of factories, mills, and mining operations. Types of industrial waste include dirt and gravel, masonry and concrete, scrap metal, oil, solvents, chemicals, scrap... | Wikipedia/Industrial_waste |
Digital transformation (DT) is the process of adoption and implementation of digital technology by an organization in order to create new or modify existing products, services and operations by the means of translating business processes into a digital format.
The goal for its implementation is to increase value throu... | Wikipedia/Digital_transformation |
Improvements to the steam engine were some of the most important technologies of the Industrial Revolution, although steam did not replace water power in importance in Britain until after the Industrial Revolution. From Englishman Thomas Newcomen's atmospheric engine, of 1712, through major developments by Scottish in... | Wikipedia/Steam_power_during_the_Industrial_Revolution |
The Rainhill trials were a competition run from 6 to 14 October 1829, to test George Stephenson's argument that locomotives would have the best motive power for the then nearly-completed Liverpool and Manchester Railway (L&MR). Ten locomotives were entered, of which five were able to compete, running along a 1 mile (1.... | Wikipedia/Rainhill_trials |
Transportation of goods to factories, and of finished products from them, was limited by high transport costs along roads to their destinations. This was not too severe in the case of light valuable materials such as textiles (woolen and linen cloth) but in the case of dense materials such as coal, it could be a limit... | Wikipedia/Transport_during_the_British_Industrial_Revolution |
The Industrial Revolution in Wales was the adoption and developments of new technologies in Wales in the 18th and 19th centuries as part of the Industrial Revolution, resulting in increases in the scale of industry in Wales.
== North-East Wales ==
Flintshire in North-East Wales developed the largest variety of indust... | Wikipedia/Industrial_Revolution_in_Wales |
In 2019, Wales generated 27% of its electricity consumption as renewable electricity, an increase from 19% in 2014. The Welsh Government set a target of 70% by 2030. In 2019, Wales was a net exporter of electricity. It produced 27.9 TWh of electricity while only consuming 14.7 TWh. The natural resource base for renewab... | Wikipedia/Renewable_energy_in_Wales |
The Hungarian Academy of Sciences (Hungarian: Magyar Tudományos Akadémia [ˈmɒɟɒr ˈtudomaːɲoʃ ˈɒkɒdeːmijɒ], MTA) is Hungary’s foremost and most prestigious learned society. Its headquarters are located along the banks of the Danube in Budapest, between Széchenyi rakpart and Akadémia utca. The Academy's primary functions... | Wikipedia/Hungarian_Academy_of_Sciences |
Demography (from Ancient Greek δῆμος (dêmos) 'people, society' and -γραφία (-graphía) 'writing, drawing, description') is the statistical study of human populations: their size, composition (e.g., ethnic group, age), and how they change through the interplay of fertility (births), mortality (deaths), and migration.
D... | Wikipedia/Demographics |
John Cockerill (3 August 1790 – 9 June 1840) was an English-born industrialist who became a prominent businessman in Belgium. Born at Haslingden, Lancashire, England, he was brought by his father (British entrepreneur William Cockerill) to the Liège region, where he continued the family tradition of building wool-proce... | Wikipedia/John_Cockerill_(industrialist) |
Electrical telegraphy is point-to-point distance communicating via sending electric signals over wire, a system primarily used from the 1840s until the late 20th century. It was the first electrical telecommunications system and the most widely used of a number of early messaging systems called telegraphs, that were de... | Wikipedia/Electrical_telegraph |
The AD–AS or aggregate demand–aggregate supply model (also known as the aggregate supply–aggregate demand or AS–AD model) is a widely used macroeconomic model that explains short-run and long-run economic changes through the relationship of aggregate demand (AD) and aggregate supply (AS) in a diagram. It coexists in an... | Wikipedia/AD–AS_model |
An energy crisis or energy shortage is any significant bottleneck in the supply of energy resources to an economy. In literature, it often refers to one of the energy sources used at a certain time and place, in particular, those that supply national electricity grids or those used as fuel in industrial development. Po... | Wikipedia/Energy_crisis |
Life in Great Britain during the Industrial Revolution shifted from an agrarian-based society to an urban, industrialised society. New social and technological ideas were developed, such as the factory system and the steam engine. Work became more regimented, disciplined, and moved outside the home with large segments ... | Wikipedia/Life_in_Great_Britain_during_the_Industrial_Revolution |
Modern monetary theory or modern money theory (MMT) is a heterodox macroeconomic theory that describes currency as a public monopoly and unemployment as evidence that a currency monopolist is overly restricting the supply of the financial assets needed to pay taxes and satisfy savings desires. According to MMT, governm... | Wikipedia/Modern_Monetary_Theory |
The Second Industrial Revolution, also known as the Technological Revolution, was a phase of rapid scientific discovery, standardisation, mass production and industrialisation from the late 19th century into the early 20th century. The First Industrial Revolution, which ended in the middle of the 19th century, was punc... | Wikipedia/Second_Industrial_Revolution |
John "Iron-Mad" Wilkinson (1728 – 14 July 1808) was an English industrialist who pioneered the manufacture of cast iron and the use of cast-iron goods during the Industrial Revolution. He was the inventor of a precision boring machine that could bore cast iron cylinders, such as cannon barrels and piston cylinders use... | Wikipedia/John_Wilkinson_(industrialist) |
From the mid-1980s to September 2003, the inflation-adjusted price of a barrel of crude oil on NYMEX was generally under US$25/barrel in 2008 dollars. During 2003, the price rose above $30, reached $60 by 11 August 2005, and peaked at $147.30 in July 2008. Commentators attributed these price increases to multiple facto... | Wikipedia/2000s_energy_crisis |
Abbeydale Industrial Hamlet is an industrial museum in the south of the City of Sheffield, England. The museum forms part of a former steel-working site on the River Sheaf, with a history going back to at least the 13th century. It consists of a number of dwellings and workshops that were formerly the Abbeydale Works—a... | Wikipedia/Abbeydale_Industrial_Hamlet |
The corporate debt bubble is the large increase in corporate bonds, excluding that of financial institutions, following the 2008 financial crisis. Global corporate debt rose from 84% of gross world product in 2009 to 92% in 2019, or about $72 trillion. In the world's eight largest economies—the United States, China, Ja... | Wikipedia/Corporate_debt_bubble |
The Anglo-Saxon model (so called because it is practiced in Anglosphere countries such as the United Kingdom, the United States, Canada, New Zealand, Australia and Ireland) is a regulated market-based economic model that emerged in the 1970s based on the Chicago school of economics, spearheaded in the 1980s in the Unit... | Wikipedia/Anglo-Saxon_model |
The real interest rate is the rate of interest an investor, saver or lender receives (or expects to receive) after allowing for inflation. It can be described more formally by the Fisher equation, which states that the real interest rate is approximately the nominal interest rate minus the inflation rate.
If, for exam... | Wikipedia/Real_interest_rate |
In demography, demographic transition is a phenomenon and theory in the social sciences referring to the historical shift from high birth rates and high death rates to low birth rates and low death rates as societies attain more technology, education (especially of women), and economic development. The demographic tran... | Wikipedia/Demographic_transition |
Proto-industrialization is the regional development, alongside commercial agriculture, of rural handicraft production for external markets.
Cottage industries in parts of Europe between the 16th and 19th centuries had long been a niche topic of study.
In the early 1970s, some economic historians introduced the label "p... | Wikipedia/Proto-industrialization |
The Argentine energy crisis was a natural gas supply shortage experienced by Argentina in 2004. After the recession triggered by the Argentine economic crisis (1999-2002), Argentina's energy demands grew quickly as industry recovered, but extraction and transportation of natural gas, a cheap and relatively abundant fos... | Wikipedia/2004_Argentine_energy_crisis |
A labour revolt or workers' uprising is a period of civil unrest characterised by strong labour militancy and strike activity. The history of labour revolts often provides the historical basis for many advocates of Marxism, communism, socialism, anarchism, and human rights, with many instances occurring around the worl... | Wikipedia/Industrial_unrest |
Crisis theory, concerning the causes and consequences of the tendency for the rate of profit to fall in a capitalist system, is associated with Marxian critique of political economy, and was further popularised through Marxist economics.
== History ==
Earlier analysis by Jean Charles Léonard de Sismondi provided the ... | Wikipedia/Crisis_theory |
The Industrial Age is a period of history that encompasses the changes in economic and social organization that began around 1760 in Great Britain and later in other countries, characterized chiefly by the replacement of hand tools with power-driven machines such as the power loom and the steam engine, and by the conce... | Wikipedia/Industrial_Age |
In finance and economics, the nominal interest rate or nominal rate of interest is the rate of interest stated on a loan or investment, without any adjustments for inflation.
== Examples of adjustments or fees ==
An adjustment for inflation (in contrast with the real interest rate).
Compound interest (also referred t... | Wikipedia/Nominal_interest_rate |
Moderate realism (also called immanent realism) is a position in the debate on the metaphysics of universals which holds that there is no realm in which universals exist (in opposition to Platonic realism, which asserts the existence of abstract objects), nor do they really exist within particulars as universals, but r... | Wikipedia/Moderate_realism |
In philosophy and early physics, horror vacui (Latin: horror of the vacuum) or plenism ()—commonly stated as "nature abhors a vacuum", for example by Spinoza—is a hypothesis attributed to Aristotle, later criticized by the atomism of Epicurus and Lucretius, that nature contains no vacuums because the denser surrounding... | Wikipedia/Horror_vacui_(physics) |
Aristotle's theory of universals is Aristotle's classical solution to the problem of universals, sometimes known as the hylomorphic theory of immanent realism. universals are the characteristics or qualities that ordinary objects or things have in common. They can be identified in the types, properties, or relations ob... | Wikipedia/Aristotle's_theory_of_universals |
Action at a distance is the concept in physics that an object's motion can be affected by another object without the two being in physical contact; that is, it is the concept of the non-local interaction of objects that are separated in space. Coulomb's law and Newton's law of universal gravitation are based on action ... | Wikipedia/Action_at_a_distance_(physics) |
In magnetostatics, Ampère's force law describes the force of attraction or repulsion between two current-carrying wires. The physical origin of this force is that each wire generates a magnetic field, following the Biot–Savart law, and the other wire experiences a magnetic force as a consequence, following the Lorentz ... | Wikipedia/Ampère's_force_law |
Science and Hypothesis (French: La Science et l'Hypothèse) is a book by French mathematician Henri Poincaré, first published in 1902. Aimed at a non-specialist readership, it deals with mathematics, space, physics and nature. It puts forward the theses that absolute truth in science is unattainable, and that many commo... | Wikipedia/La_Science_et_l'Hypothèse |
In electromagnetism, the electromagnetic tensor or electromagnetic field tensor (sometimes called the field strength tensor, Faraday tensor or Maxwell bivector) is a mathematical object that describes the electromagnetic field in spacetime. The field tensor was developed by Arnold Sommerfeld after the four-dimensional... | Wikipedia/Faraday_tensor |
Sinusoidal plane-wave solutions are particular solutions to the wave equation.
The general solution of the electromagnetic wave equation in homogeneous, linear, time-independent media can be written as a linear superposition of plane-waves of different frequencies and polarizations.
The treatment in this article is cla... | Wikipedia/Sinusoidal_plane-wave_solutions_of_the_electromagnetic_wave_equation |
In general relativity, the Raychaudhuri equation, or Landau–Raychaudhuri equation, is a fundamental result describing the motion of nearby bits of matter.
The equation is important as a fundamental lemma for the Penrose–Hawking singularity theorems and for the study of exact solutions in general relativity, but has ind... | Wikipedia/Raychaudhuri_equation |
In general relativity, the Hamilton–Jacobi–Einstein equation (HJEE) or Einstein–Hamilton–Jacobi equation (EHJE) is an equation in the Hamiltonian formulation of geometrodynamics in superspace, cast in the "geometrodynamics era" around the 1960s, by Asher Peres in 1962 and others. It is an attempt to reformulate general... | Wikipedia/Hamilton–Jacobi–Einstein_equation |
In electromagnetism, the Lorentz force is the force exerted on a charged particle by electric and magnetic fields. It is the fundamental force that governs the motion of charged particles in electromagnetic fields and underlies many physical phenomena, from the operation of electric motors and particle accelerators to ... | Wikipedia/Lorenz_force |
The Friedmann equations, also known as the Friedmann–Lemaître (FL) equations, are a set of equations in physical cosmology that govern cosmic expansion in homogeneous and isotropic models of the universe within the context of general relativity. They were first derived by Alexander Friedmann in 1922 from Einstein's fie... | Wikipedia/Friedmann_equations |
The Fresnel equations (or Fresnel coefficients) describe the reflection and transmission of light (or electromagnetic radiation in general) when incident on an interface between different optical media. They were deduced by French engineer and physicist Augustin-Jean Fresnel () who was the first to understand that ligh... | Wikipedia/Fresnel_equations |
The Milne model was a special-relativistic cosmological model of the universe proposed by Edward Arthur Milne in 1935. It is mathematically equivalent to a special case of the FLRW model in the limit of zero energy density and it obeys the cosmological principle. The Milne model is also similar to Rindler space in that... | Wikipedia/Milne_model |
In mathematics, the Ernst equation is an integrable non-linear partial differential equation, named after the American physicist Frederick J. Ernst.
== The Ernst equation ==
The equation reads:
ℜ
(
u
)
(
u
r
... | Wikipedia/Ernst_equation |
In physics, gravity (from Latin gravitas 'weight'), also known as gravitation or a gravitational interaction, is a fundamental interaction, a mutual attraction between all massive particles. On Earth, gravity takes a slightly different meaning: the observed force between objects and the Earth. This force is dominated ... | Wikipedia/Gravitational_physics |
The electromagnetic wave equation is a second-order partial differential equation that describes the propagation of electromagnetic waves through a medium or in a vacuum. It is a three-dimensional form of the wave equation. The homogeneous form of the equation, written in terms of either the electric field E or the ma... | Wikipedia/Electromagnetic_wave_equation |
In astrophysics, the Tolman–Oppenheimer–Volkoff (TOV) equation constrains the structure of a spherically symmetric body of isotropic material which is in static gravitational equilibrium, as modeled by general relativity. The equation is
d
P
... | Wikipedia/Tolman–Oppenheimer–Volkoff_equation |
Finite-difference time-domain (FDTD) or Yee's method (named after the Chinese American applied mathematician Kane S. Yee, born 1934) is a numerical analysis technique used for modeling computational electrodynamics.
== History ==
Finite difference schemes for time-dependent partial differential equations (PDEs) have ... | Wikipedia/Finite-difference_time-domain_method |
In electromagnetism, a branch of fundamental physics, the matrix representations of the Maxwell's equations are a formulation of Maxwell's equations using matrices, complex numbers, and vector calculus. These representations are for a homogeneous medium, an approximation in an inhomogeneous medium. A matrix representa... | Wikipedia/Matrix_representation_of_Maxwell's_equations |
In electromagnetism and applications, an inhomogeneous electromagnetic wave equation, or nonhomogeneous electromagnetic wave equation, is one of a set of wave equations describing the propagation of electromagnetic waves generated by nonzero source charges and currents. The source terms in the wave equations make the p... | Wikipedia/Inhomogeneous_electromagnetic_wave_equation |
Science in the medieval Islamic world was the science developed and practised during the Islamic Golden Age under the Abbasid Caliphate of Baghdad, the Umayyads of Córdoba, the Abbadids of Seville, the Samanids, the Ziyarids and the Buyids in Persia and beyond, spanning the period roughly between 786 and 1258. Islamic ... | Wikipedia/Science_in_medieval_Islam |
The many-worlds interpretation (MWI) is an interpretation of quantum mechanics that asserts that the universal wavefunction is objectively real, and that there is no wave function collapse. This implies that all possible outcomes of quantum measurements are physically realized in different "worlds". The evolution of re... | Wikipedia/Many-worlds_interpretation_of_quantum_mechanics |
The B-theory of time, also called the "tenseless theory of time", is one of two positions regarding the temporal ordering of events in the philosophy of time. B-theorists argue that the flow of time is only a subjective illusion of human consciousness, that the past, present, and future are equally real, and that time ... | Wikipedia/B-theory_of_time |
In philosophy, the philosophy of physics deals with conceptual and interpretational issues in physics, many of which overlap with research done by certain kinds of theoretical physicists. Historically, philosophers of physics have engaged with questions such as the nature of space, time, matter and the laws that govern... | Wikipedia/Philosophical_interpretation_of_classical_physics |
An interpretation of quantum mechanics is an attempt to explain how the mathematical theory of quantum mechanics might correspond to experienced reality. Quantum mechanics has held up to rigorous and extremely precise tests in an extraordinarily broad range of experiments. However, there exist a number of contending sc... | Wikipedia/Quantum_metaphysics |
The term physics envy is used to criticize modern writing and research of academics working in areas such as "softer sciences", philosophy, liberal arts, business administration education, humanities, and social sciences. The term argues that writing and working practices in these disciplines have overused confusing ja... | Wikipedia/Physics_envy |
Some interpretations of quantum mechanics posit a central role for an observer of a quantum phenomenon. The quantum mechanical observer is tied to the issue of observer effect, where a measurement necessarily requires interacting with the physical object being measured, affecting its properties through the interaction.... | Wikipedia/Observer_(quantum_physics) |
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