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Achilles Papapetrou
Achille Papapetrou ( el, Αχιλλέας Νικολάου Παπαπέτρου; February 2, 1907 – August 12, 1997) was a Greek theoretical physicist, who contributed to the general theory of relativity. He is known for the Mathisson–Papapetrou–Dixon equations, the Majumdar–Papapetrou solution, and the Weyl−Lewis−Papapetrou coordinates of gravity theory. He worked on exact solutions of Einstein's field equations and long sought a solution for rotating masses, which, however, were only found by Roy Kerr. Papapetrou was then the first who recognized and jubilantly welcomed Kerr's breakthrough announced at the Texas Symposium on Relativistic Astrophysics, Dallas, December 1963. Early life and education Papapetrou was born in Irakleia Serres in Northern Greece (Macedonia province), on February 2, 1907. His father was a schoolteacher. During World War I, his family was deported from Serres, but returned at the end of the war. From 1925, Papapetrou studied mechanical a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Irakleia, Serres
Irakleia ( el, Ηράκλεια, before 1926: Τζουμαγιά - ''Tzoumagia'') is a municipality in the Serres regional unit, Central Macedonia, Greece. Population 21,145 (2011). The seat of the municipality is the town of Irakleia, which was formerly known as "Lower Jumaya" (in tr, Barakli Cuma or Cuma-i Zir ("Lower Juma" in Ottoman Turkish); in bg, Долна Джумая, ''Dolna Dzhumaya'';Ιστορία του Ελληνικού Έθνους. Εκδοτική Αθηνών, Αθήνα 1978. , σελ. 228-229Map of the Italian Instituto Geografico de Agostini, showing the distribution of schools, churches, monasteries in the Ottoman vilayet of Saloniki/ref> and in rup, Giumaia di-Nghios). "Upper Dzhumaya" is modern Blagoevgrad, located in Bulgaria. In the Serres area, during Ottoman times, Aromanians The Aromanians ( rup, Armãnji, Rrãmãnji) are an ethnic group native to the southern Balkans who speak Aromanian, an Eastern Romance language. They traditionally l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rodolfo Gambini
Rodolfo Gambini (born 11 May 1946) is a physicist and professor of the Universidad de la Republica in Montevideo, Uruguay and a visiting professor at the Horace Hearne Institute for Theoretical Physics at the Louisiana State University. He works on loop quantum gravity. He got his PhD in Université de Paris VI working with Achilles Papapetrou. From there he moved to the Universidad Simón Bolívar in Venezuela where he rose through the professorial ranks. It was there that together with fellow physicist Antoni Trías he invented the loop representation for Yang-Mills theories in 1986. Gambini returned to Uruguay in 1987 after democracy had returned to the country. Gambini has published over 100 scientific articles ranging from philosophy of science and foundations of quantum mechanics to lattice gauge theories to quantum gravity. He was head of the Pedeciba, the main funding agency for basic sciences in Uruguay (2003–2008). He is a fellow of the American Physical Soci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theory Of Relativity
The theory of relativity usually encompasses two interrelated theories by Albert Einstein: special relativity and general relativity, proposed and published in 1905 and 1915, respectively. Special relativity applies to all physical phenomena in the absence of gravity. General relativity explains the law of gravitation and its relation to the forces of nature. It applies to the cosmological and astrophysical realm, including astronomy. The theory transformed theoretical physics and astronomy during the 20th century, superseding a 200-year-old theory of mechanics created primarily by Isaac Newton. It introduced concepts including 4-dimensional spacetime as a unified entity of space and time, relativity of simultaneity, kinematic and gravitational time dilation, and length contraction. In the field of physics, relativity improved the science of elementary particles and their fundamental interactions, along with ushering in the nuclear age. With relativity, cosmology and astro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solid State Physics
Solid-state physics is the study of rigid matter, or solids, through methods such as quantum mechanics, crystallography, electromagnetism, and metallurgy. It is the largest branch of condensed matter physics. Solid-state physics studies how the large-scale properties of solid materials result from their atomic-scale properties. Thus, solid-state physics forms a theoretical basis of materials science. It also has direct applications, for example in the technology of transistors and semiconductors. Background Solid materials are formed from densely packed atoms, which interact intensely. These interactions produce the mechanical (e.g. hardness and elasticity), thermal, electrical, magnetic and optical properties of solids. Depending on the material involved and the conditions in which it was formed, the atoms may be arranged in a regular, geometric pattern (crystalline solids, which include metals and ordinary water ice) or irregularly (an amorphous solid such as com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
General Relativity And Gravitation
A general officer is an officer of high rank in the armies, and in some nations' air forces, space forces, and marines or naval infantry. In some usages the term "general officer" refers to a rank above colonel."general, adj. and n.". OED Online. March 2021. Oxford University Press. https://www.oed.com/view/Entry/77489?rskey=dCKrg4&result=1 (accessed May 11, 2021) The term ''general'' is used in two ways: as the generic title for all grades of general officer and as a specific rank. It originates in the 16th century, as a shortening of ''captain general'', which rank was taken from Middle French ''capitaine général''. The adjective ''general'' had been affixed to officer designations since the late medieval period to indicate relative superiority or an extended jurisdiction. Today, the title of ''general'' is known in some countries as a four-star rank. However, different countries use different systems of stars or other insignia for senior ranks. It has a NATO rank sc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrical Engineering
Electrical engineering is an engineering discipline concerned with the study, design, and application of equipment, devices, and systems which use electricity, electronics, and electromagnetism. It emerged as an identifiable occupation in the latter half of the 19th century after commercialization of the electric telegraph, the telephone, and electrical power generation, distribution, and use. Electrical engineering is now divided into a wide range of different fields, including computer engineering, systems engineering, power engineering, telecommunications, radio-frequency engineering, signal processing, instrumentation, photovoltaic cells, electronics, and optics and photonics. Many of these disciplines overlap with other engineering branches, spanning a huge number of specializations including hardware engineering, power electronics, electromagnetics and waves, microwave engineering, nanotechnology, electrochemistry, renewable energies, mechatronics/control, and ele ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World War I
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fighting occurring throughout Europe, the Middle East, Africa, the Pacific, and parts of Asia. An estimated 9 million soldiers were killed in combat, plus another 23 million wounded, while 5 million civilians died as a result of military action, hunger, and disease. Millions more died in genocides within the Ottoman Empire and in the 1918 influenza pandemic, which was exacerbated by the movement of combatants during the war. Prior to 1914, the European great powers were divided between the Triple Entente (comprising France, Russia, and Britain) and the Triple Alliance (containing Germany, Austria-Hungary, and Italy). Tensions in the Balkans came to a head on 28 June 1914, following the assassination of Archduke Franz Ferdi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Texas Symposium On Relativistic Astrophysics
Ivor Robinson (October 7, 1923 – May 27, 2016) was a British-American mathematical physicist, born and educated in England, noted for his important contributions to the theory of relativity. He was a principal organizer of the Texas Symposium on Relativistic Astrophysics. Biography Born in Liverpool, October 7, 1923, "into a comfortable Jewish middle-class family", Ivor Robinson read mathematics at Cambridge University as an undergraduate, where he was influenced by Abram Samoilovitch Besicovitch. He took his B.A. in Mathematics in 1947. His first academic placements were at University College of Wales, King's College London, University of North Carolina, University of Hamburg, Syracuse University and Cornell University. Alfred Schild was developing a department strong in relativity at Austin, Texas, when a second Texas center for relativity research was proposed. Lloyd Berkner was directing the Southwest Center for Advanced Studies at Dallas and brought Ivor Robinson there ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roy Kerr
Roy Patrick Kerr (; born 16 May 1934) is a New Zealand mathematician who discovered the Kerr geometry, an exact solution to the Einstein field equation of general relativity. His solution models the gravitational field outside an uncharged rotating massive object, including a rotating black hole.''Cracking the Einstein Code'' by Fulvio Melia, 2009 His solution to Einstein's equations predicted spinning black holes before they were discovered. Early life and education Kerr was born in 1934 in Kurow, New Zealand. He was born into a dysfunctional family, and his mother wa ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
General Theory Of Relativity
General relativity, also known as the general theory of relativity and Einstein's theory of gravity, is the differential geometry, geometric scientific theory, theory of gravitation published by Albert Einstein in 1915 and is the current description of gravitation in modern physics. General theory of relativity, relativity generalizes special relativity and refines Newton's law of universal gravitation, providing a unified description of gravity as a geometric property of space and time in physics, time or four-dimensional space, four-dimensional spacetime. In particular, the ' is directly related to the energy and momentum of whatever matter and radiation are present. The relation is specified by the Einstein field equations, a system of second order partial differential equations. Newton's law of universal gravitation, which describes classical gravity, can be seen as a prediction of general relativity for the almost flat spacetime geometry around stationary mass distribution ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theoretical Physicist
Theoretical physics is a branch of physics that employs mathematical models and abstractions of physical objects and systems to rationalize, explain and predict natural phenomena. This is in contrast to experimental physics, which uses experimental tools to probe these phenomena. The advancement of science generally depends on the interplay between experimental studies and theory. In some cases, theoretical physics adheres to standards of mathematical rigour while giving little weight to experiments and observations.There is some debate as to whether or not theoretical physics uses mathematics to build intuition and illustrativeness to extract physical insight (especially when normal experience fails), rather than as a tool in formalizing theories. This links to the question of it using mathematics in a less formally rigorous, and more intuitive or heuristic way than, say, mathematical physics. For example, while developing special relativity, Albert Einstein was concerned with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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