42,772 articles
Einstein–Podolsky–Rosen paradox
The Einstein–Podolsky–Rosen (EPR) paradox is a 1935 argument by Einstein, Podolsky, and Rosen claiming quantum mechanics is incomplete; Bell tests from 1972 onward sided with quantum mechanics.
Einstein–Rosen cylindrical waves
Einstein–Rosen cylindrical waves are exact vacuum solutions of Einstein's field equations describing gravitational waves with cylindrical symmetry, introduced by Einstein and Rosen in their 1937 paper "On Gravitational Waves".
Einstein's static universe
Einstein's static universe is a cosmological solution of general relativity, presented by Albert Einstein in 1917, in which a finite, positively curved 3-sphere universe is balanced by a cosmological constant.
Einstein's thought experiments
Einstein's thought experiments (German: Gedankenexperimente) are imaginary scenarios Albert Einstein used to derive relativity, including the chasing of a light beam, the light clock, the train and embankment, and the elevator.
Einstein@Home
Einstein@Home is a distributed volunteer computing project launched in 2005 by the Max Planck Institute for Gravitational Physics, which uses idle PCs to find pulsars.
Einsteinium
Einsteinium (Element 99), symbol Es, is a synthetic radioactive actinide discovered in 1952 in the Ivy Mike thermonuclear test debris; it has no uses outside basic research.
Eirene (moon)
Eirene, officially Jupiter LVII and once designated S/2003 J 5, is a small retrograde irregular moon of Jupiter in the Carme group, discovered by Scott S. Sheppard in 2003.
Eisenstein series
Eisenstein series are modular forms defined as sums of inverse powers over the nonzero points of a lattice, the simplest explicit examples in the theory of modular forms.
Eisenstein's criterion
Eisenstein's criterion, also called the Schönemann–Eisenstein theorem, is a test in algebra that proves a polynomial with integer coefficients irreducible over the rationals, published by Eisenstein in 1850.
Eisinga Planetarium in Franeker
The Eisinga Planetarium, officially the Royal Eise Eisinga Planetarium, is a working scale model of the solar system built into a Franeker home between 1774 and 1781.
Eitan Tadmor
Eitan Tadmor, born 1954 in Jerusalem, is an applied mathematician at the University of Maryland known for central schemes for conservation laws and entropy stability.
Eizi Hirota
Eizi Hirota (廣田榮治) is a Japanese spectroscopist known for detecting about 100 transient molecules and free radicals by microwave and infrared laser spectroscopy, and for winning the Japan Academy Prize.
Ejecta
Ejecta is material forced or thrown out, especially by a volcanic eruption, an impact on a planet or moon, or a stellar explosion, ranging from ash to bombs.
Ejnar Hertzsprung
Ejnar Hertzsprung (1873–1967) was a Danish chemist-turned-astronomer who discovered that stars divide into giants and dwarfs, first calibrated Cepheid distances, and pioneered the Hertzsprung–Russell diagram.
EK Dra
EK Draconis, abbreviated EK Dra, is a young, rapidly rotating G-type star about 111 light-years away in Draco, studied as a proxy for the young Sun.
Ekman layer
The Ekman layer is the wind-driven surface layer of the ocean, about 100 m deep, where the current spirals with depth due to Earth's rotation.
Ekman pumping
Ekman pumping is the vertical motion induced in a rotating fluid where a frictional boundary layer meets the interior, caused by friction turning the flow across isobars.
Ekman transport
Ekman transport is the net horizontal movement of wind-driven surface water in the ocean, deflected 90 degrees to the right of the wind in the Northern Hemisphere.
El Abra mine
El Abra is an open-pit copper mine in Chile's Antofagasta Region, 75 kilometers northeast of Calama, owned by Freeport-McMoRan (51%) and Codelco, producing copper cathodes since 1996.
El Colegio de México
El Colegio de México, known as Colmex, is a public research university in Mexico City founded in 1940, focused on the social sciences and humanities.
El Farol Bar problem
The El Farol Bar problem is a model of decision-making introduced by economist W. Brian Arthur in 1994, where 100 people decide whether to attend a bar enjoyable only under 60 attendance.
El Niño–Southern Oscillation
The El Niño–Southern Oscillation (ENSO) is a Pacific Ocean climate pattern alternating between the warm El Niño and cool La Niña phases, driving year-to-year climate variability.
El Rosario Formation
El Rosario Formation (Formación Rosario), Late Cretaceous Campanian-Maastrichtian marine to non-marine clastic unit on the Pacific coast of Baja California, Mexico; type section near El Rosario town; includes deep-marine turbidites and rich fossils.
El Teniente
El Teniente is an underground copper mine in the Andes of central Chile, about 50 kilometers east of Rancagua, and the largest underground copper deposit in operation.
El Victor
El Victor is a gold deposit and former open pit in the Mulatos District of Sonora, Mexico, operated by Alamos Gold and mined until mid-2021.
Elad Harel
Elad Harel is a physical chemist and assistant professor at Northwestern University who works on multidimensional ultrafast spectroscopy and halide perovskites, and received the 2016 PECASE award.
ELAIS N1
ELAIS N1 is an extragalactic survey field in the northern sky, mapped in the infrared by ESA's Infrared Space Observatory and later a LOFAR deep radio field.
Elastic cloaking
Elastic cloaking is the design of a material shell that makes an object invisible to elastic waves, first demonstrated experimentally in a polymer plate in 2012.
Elastic collision
An elastic collision is a collision between bodies in which total kinetic energy is conserved alongside momentum, so no kinetic energy becomes heat or deformation.
Elastic energy
Elastic energy, or elastic potential energy, is the energy stored in an object when it is deformed, such as a stretched spring, and returned as work.