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Dennis Sciama
Dennis William Siahou Sciama, (; 18 November 1926 – 18/19 December 1999) was a British physicist who, through his own work and that of his students, played a major role in developing British physics after the Second World War. He was the PhD supervisor to many famous cosmologists, including Stephen Hawking, Martin Rees and David Deutsch; he is considered one of the fathers of modern cosmology. Education and early life Sciama was born in Manchester, England, the son of Nelly Ades and Abraham Sciama. He was of Syrian-Jewish ancestry — his father born in Manchester and his mother born in Egypt, but both traced their roots back to Aleppo, Syria. Sciama earned his PhD in 1953 at the University of Cambridge supervised by Paul Dirac, with a dissertation on Mach's principle and inertia. His work later influenced the formulation of scalar-tensor theories of gravity. Career and research Sciama taught at Cornell University, King's College London, Harvard University and the Unive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manchester
Manchester () is a city in Greater Manchester, England. It had a population of 552,000 in 2021. It is bordered by the Cheshire Plain to the south, the Pennines to the north and east, and the neighbouring city of Salford to the west. The two cities and the surrounding towns form one of the United Kingdom's most populous conurbations, the Greater Manchester Built-up Area, which has a population of 2.87 million. The history of Manchester began with the civilian settlement associated with the Roman fort ('' castra'') of ''Mamucium'' or ''Mancunium'', established in about AD 79 on a sandstone bluff near the confluence of the rivers Medlock and Irwell. Historically part of Lancashire, areas of Cheshire south of the River Mersey were incorporated into Manchester in the 20th century, including Wythenshawe in 1931. Throughout the Middle Ages Manchester remained a manorial township, but began to expand "at an astonishing rate" around the turn of the 19th century. Manchest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brandon Carter
Brandon Carter, (born 1942) is an Australian theoretical physicist, best known for his work on the properties of black holes and for being the first to name and employ the anthropic principle in its contemporary form. He is a researcher at the Meudon campus of the Laboratoire Univers et Théories, part of the CNRS. Biography Carter studied at the University of Cambridge under Dennis Sciama. He found the exact solution of the geodesic equations for the Kerr/Newman electrovacuum solution, and the maximal analytic extension of this solution. In the process, he discovered the extraordinary ''fourth constant of motion'' and the Killing–Yano tensor. Together with Werner Israel and Stephen Hawking, he proved partially the no-hair theorem in general relativity, stating that all stationary black holes are completely characterized by mass, charge, and angular momentum. In 1982 with astrophysicist Jean-Pierre Luminet, he invented the concept of tidal disruption event (TDE), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gravitational Waves
Gravitational waves are waves of the intensity of gravity generated by the accelerated masses of an orbital binary system that Wave propagation, propagate as waves outward from their source at the speed of light. They were first proposed by Oliver Heaviside in 1893 and then later by Henri Poincaré in 1905 as waves similar to Electromagnetic radiation, electromagnetic waves but the gravitational equivalent. Gravitational waves were later #History, predicted in 1916 by Albert Einstein on the basis of his General relativity, general theory of relativity as ripples in spacetime. Later he refused to accept gravitational waves. Gravitational waves transport energy as gravitational radiation, a form of radiant energy similar to electromagnetic radiation. Newton's law of universal gravitation, part of classical mechanics, does not provide for their existence, since that law is predicated on the assumption that Speed of gravity, physical interactions propagate instantaneously (at infinite ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Darkmatter
DarkMatter was an art and activist collaboration between Janani Balasubramanian and Alok Vaid-Menon, known for their spoken word performances and queer/trans South Asian themes. Background Balasubramanian and Vaid-Menon, both Indian American, met as students at Stanford University in 2009. They later joined the Stanford Slam Poetry Team and performed in spoken word venues like C.U.P.S.I. (College Unions Poetry Slam Invitational) and other college circuit slams. The duo cite a lack of representation of South Asian poets, especially queer and/or trans South Asian poets, as an impetus for their decision to form DarkMatter and tour independently starting in 2013. Much of their poetry and activism is inspired by the lack of visibility for QTPOC (queer/trans people of color), The name DarkMatter was chosen to reflect that invisibility. Both poets decided to finish school and move to New York, making that the center for their art and activism after their first tour in 2013. As a duo, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Big Bang Theory
The Big Bang event is a physical theory that describes how the universe expanded from an initial state of high density and temperature. Various cosmological models of the Big Bang explain the evolution of the observable universe from the earliest known periods through its subsequent large-scale form. These models offer a comprehensive explanation for a broad range of observed phenomena, including the abundance of light elements, the cosmic microwave background (CMB) radiation, and large-scale structure. The overall uniformity of the Universe, known as the flatness problem, is explained through cosmic inflation: a sudden and very rapid expansion of space during the earliest moments. However, physics currently lacks a widely accepted theory of quantum gravity that can successfully model the earliest conditions of the Big Bang. Crucially, these models are compatible with the Hubble–Lemaître law—the observation that the farther away a galaxy is, the faster it is moving ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black Holes
A black hole is a region of spacetime where gravity is so strong that nothing, including light or other electromagnetic waves, has enough energy to escape it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of no escape is called the event horizon. Although it has a great effect on the fate and circumstances of an object crossing it, it has no locally detectable features according to general relativity. In many ways, a black hole acts like an ideal black body, as it reflects no light. Moreover, quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum as a black body of a temperature inversely proportional to its mass. This temperature is of the order of billionths of a kelvin for stellar black holes, making it essentially impossible to observe directly. Objects whose gravitational fields are too strong for light to escape were first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cosmology
Cosmology () is a branch of physics and metaphysics dealing with the nature of the universe. The term ''cosmology'' was first used in English in 1656 in Thomas Blount (lexicographer), Thomas Blount's ''Glossographia'', and in 1731 taken up in Latin by German philosophy, German philosopher Christian Wolff (philosopher), Christian Wolff, in ''Cosmologia Generalis''. Religious cosmology, Religious or mythological cosmology is a body of beliefs based on Mythology, mythological, Religion, religious, and Esotericism, esoteric literature and traditions of Cosmogony, creation myths and eschatology. In the science of astronomy it is concerned with the study of the chronology of the universe. Physical cosmology is the study of the observable universe's origin, its large-scale structures and dynamics, and the ultimate fate of the universe, including the laws of science that govern these areas. It is investigated by scientists, such as astronomers and physicists, as well as Philosophy, ph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tim Palmer (physicist)
Timothy Noel Palmer CBE FRS (born 31 December 1952) is a mathematical physicist by training. He has spent most of his career working on the dynamics and predictability of weather and climate. Among various research achievements, he pioneered the development of probabilistic ensemble forecasting techniques for weather and climate prediction (at the Met Office and the European Centre for Medium-Range Weather Forecasts). These techniques are now standard in operational weather and climate prediction around the world, and are central for reliable decision making for many commercial and humanitarian applications. Early life and education Palmer was born in Kingston upon Thames, Surrey in 1952. He received a 1st Class Joint Honours Degree in Mathematics and Physics from the University of Bristol and a Doctor of Philosophy in General Relativity Theory from the University of Oxford. Research Palmer’s research has focussed on the nonlinear predictability and dynamics of the climate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antony Valentini
Antony Valentini is a theoretical physicist known for his work on the foundations of quantum physics.Lee Smolin: '' The Trouble With Physics: The Rise of String Theory, The Fall of a Science, and What Comes Next'', First Mariner book edition 2007, p. 322anp. 326/ref> Education and career Valentini obtained an undergraduate degree from Cambridge University, then earned his Ph.D. in 1992 with Dennis Sciama at the International School for Advanced Studies (ISAS-SISSA) in Trieste, Italy.Antony Valentini: ''On the Pilot-Wave Theory of Classical, Quantum and Subquantum Physics'', Ph.D. Thesis, ISAS, Trieste 1992 In 1999, after seven years in Italy, he took up a post-doc grant to work at the Imperial College with Lee Smolin and Christopher Isham. He worked at the Perimeter Institute for Theoretical Physics. In February 2011, he became professor of physics and astronomy at Clemson University; as of 2022, he was listed as adjunct faculty. Together with Mike Towler, Royal Society resea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Martin Rees
Martin John Rees, Baron Rees of Ludlow One or more of the preceding sentences incorporates text from the royalsociety.org website where: (born 23 June 1942) is a British cosmologist and astrophysicist. He is the fifteenth Astronomer Royal, appointed in 1995, and was Master of Trinity College, Cambridge, from 2004 to 2012 and President of the Royal Society between 2005 and 2010. Education and early life Rees was born on 23 June 1942 in York, England.Anon (2017) After a peripatetic life during the war his parents, both teachers, settled with Rees, an only child, in a rural part of Shropshire near the border with Wales. There, his parents founded Bedstone College, a boarding school based on progressive educational concepts. He was educated at Bedstone College, then from the age of 13 at Shrewsbury School. He studied for the mathematical tripos at Trinity College, Cambridge, graduating with first class honours. He then undertook post-graduate research at Cambridge and compl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adrian Melott
Adrian Lewis Melott (born January 7, 1947) is an American physicist. He is one of the pioneers of using large-scale computing to investigate the formation of large-scale structure in a Universe dominated by dark matter. He later turned his attention to an area he calls “astrobiophysics”, examining a variety of ways that external events in our galaxy may have influenced the course of life on Earth, including analysis of gamma-ray burst events. Life Born in Moundsville, West Virginia, his early scientific interest was in physical chemistry, but later changed to study physics at Bethany College in West Virginia. He became active in the antiwar and educational movements of the 60's, and was drawn into the Unitarian ministry. He attended Starr King School for the Ministry in Berkeley, California and was minister in Tampa, Florida for 7 years. During this time he continued his interest in physics. In 1977 he entered the physics program at the University of Texas at Austin where ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
