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Totalitarian Principle
In quantum mechanics, the totalitarian principle states: "Everything not forbidden is compulsory." Physicists including Murray Gell-Mann borrowed this expression, and its satirical reference to totalitarianism, from the popular culture of the early twentieth century. The statement refers to a surprising feature of particle interactions: that any interaction that is not forbidden by a small number of simple conservation laws is not only allowed, but ''must'' be included in the sum over all " paths" that contribute to the outcome of the interaction. Hence if it is not forbidden, there is some probability amplitude for it to happen. In the many-worlds interpretation of quantum mechanics, the principle has a more literal meaning: that every possibility at every interaction that is not forbidden by such a conservation law will actually happen (in some branch of the wave function). Origin of the phrase Neither the phrase nor its application to quantum physics originated with Gell-Ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quantum Mechanics
Quantum mechanics is the fundamental physical Scientific theory, theory that describes the behavior of matter and of light; its unusual characteristics typically occur at and below the scale of atoms. Reprinted, Addison-Wesley, 1989, It is the foundation of all quantum physics, which includes quantum chemistry, quantum field theory, quantum technology, and quantum information science. Quantum mechanics can describe many systems that classical physics cannot. Classical physics can describe many aspects of nature at an ordinary (macroscopic and Microscopic scale, (optical) microscopic) scale, but is not sufficient for describing them at very small submicroscopic (atomic and subatomic) scales. Classical mechanics can be derived from quantum mechanics as an approximation that is valid at ordinary scales. Quantum systems have Bound state, bound states that are Quantization (physics), quantized to Discrete mathematics, discrete values of energy, momentum, angular momentum, and ot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quark
A quark () is a type of elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nucleus, atomic nuclei. All commonly observable matter is composed of up quarks, down quarks and electrons. Owing to a phenomenon known as ''color confinement'', quarks are never found in isolation; they can be found only within hadrons, which include baryons (such as protons and neutrons) and mesons, or in quark–gluon plasmas. There is also the theoretical possibility of #Other_phases_of_quark_matter, more exotic phases of quark matter. For this reason, much of what is known about quarks has been drawn from observations of hadrons. Quarks have various Intrinsic and extrinsic properties, intrinsic physical property, properties, including electric charge, mass, color charge, and Spin (physics), spin. They are the only elementary particles in the Standard Mode ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Everything Which Is Not Forbidden Is Allowed
"Everything which is not forbidden is allowed" is a legal maxim. It is the concept that any action can be taken unless there is a law against it. It is also known in some situations as the "general power of competence" whereby the body or person being regulated is acknowledged to have competent judgement of their scope of action. The opposite principle "everything which is not allowed is forbidden" states that an action can only be taken if it is specifically allowed. A senior English judge, Sir John Laws, stated the principles as: "For the individual citizen, everything which is not forbidden is allowed; but for public bodies, and notably government, everything which is not allowed is forbidden." Legal philosopher Ota Weinberger put it this way: "In a closed system in which all obligations are stated explicitly the following inference rules are valid: (XI) Everything which is not forbidden is allowed". Domestic law Czech Republic The Czech constitution, Article 2, paragra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert Heinlein
Robert Anson Heinlein ( ; July 7, 1907 – May 8, 1988) was an American science fiction author, aeronautical engineer, and naval officer. Sometimes called the "dean of science fiction writers", he was among the first to emphasize scientific accuracy in his fiction, and was thus a pioneer of the subgenre of hard science fiction. His published works, both fiction and non-fiction, express admiration for competence and emphasize the value of critical thinking. His plots often posed provocative situations which challenged conventional social mores. His work continues to have an influence on the science-fiction genre, and on modern culture more generally. Heinlein became one of the first American science-fiction writers to break into mainstream magazines such as ''The Saturday Evening Post'' in the late 1940s. He was one of the best-selling science-fiction novelists for many decades, and he, Isaac Asimov, and Arthur C. Clarke are often considered the "Big Three" of English-language ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jack Parsons
John Whiteside Parsons (born Marvel Whiteside Parsons; October 2, 1914 – June 17, 1952) was an American Aerospace engineering, rocket engineer, chemist, and Thelemite, Thelemite occultist. Parsons was one of the principal founders of both the Jet Propulsion Laboratory (JPL) and Aerojet. He invented the first rocket engine to use a Castability, castable, Composite material, composite rocket propellant, and pioneered the advancement of both Liquid-fuel rocket, liquid-fuel and Solid-fuel rocket, solid-fuel rockets. Parsons was raised in Pasadena, California. He began Amateur rocketry, amateur rocket experiments with school friend Edward Forman in 1928. Parsons was admitted to Stanford University but left before graduating due to financial hardship during the Great Depression. In 1934, Parsons, Forman, and Frank Malina formed the Caltech-affiliated Guggenheim Aeronautical Laboratory (GALCIT) Rocket Research Group, with support by GALCIT chairman Theodore von Kármán. The group w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ace Trade
Ace Books is a publisher of science fiction (SF) and fantasy books founded in New York City in 1952 by A. A. Wyn, Aaron A. Wyn. It began as a genre publisher of mystery fiction, mysteries and western (genre), westerns, and soon branched out into other genres, publishing its first science fiction title in 1953. This was successful, and science fiction titles outnumbered both mysteries and westerns within a few years. Other genres also made an appearance, including nonfiction, Gothic fiction, gothic novels, media tie-in novelizations, and romance novel, romances. Ace became known for the ''dos-à-dos binding#Tête-bêche, tête-bêche'' binding format used for many of its early books, although it did not originate the format. Most of the early titles were published in this "Ace Double" format, and Ace continued to issue books in varied genres, bound ''tête-bêche'', until 1973. Ace, along with Ballantine Books, was one of the leading science fiction publishers for its first ten ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Once And Future King
''The Once and Future King'' is a collection of fantasy novels by T. H. White about the legend of King Arthur. It is loosely based upon the 1485 work ''Le Morte d'Arthur'' by Sir Thomas Malory. It was first published in 1958 as a collection of shorter novels that were published from 1938 to 1940, with some new or amended material. The title refers to a legend that Arthur will one day return as king. Plot Most of the book takes place in Gramarye, the name that White gives to Britain, and chronicles the youth and education of King Arthur, his rule as a king, and the romance between Sir Lancelot and Queen Guinevere. The story starts in the final years of the rule of King Uther Pendragon. '' The Sword in the Stone'' The first part, "The Sword in the Stone" (first published 1938), chronicles Arthur's upbringing by his foster father Sir Ector, his rivalry and friendship with his foster brother Kay, and his initial training by Merlyn, a wizard who lives through time backwards. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hadron
In particle physics, a hadron is a composite subatomic particle made of two or more quarks held together by the strong nuclear force. Pronounced , the name is derived . They are analogous to molecules, which are held together by the electric force. Most of the mass of ordinary matter comes from two hadrons: the proton and the neutron, while most of the mass of the protons and neutrons is in turn due to the binding energy of their constituent quarks, due to the strong force. Hadrons are categorized into two broad families: baryons, made of an odd number of quarks (usually three) and mesons, made of an even number of quarks (usually two: one quark and one antiquark). Protons and neutrons (which make the majority of the mass of an atom) are examples of baryons; pions are an example of a meson. A tetraquark state (an exotic meson), named the Z(4430), was discovered in 2007 by the Belle Collaboration and confirmed as a resonance in 2014 by the LHCb collaboration. Two pe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physicist
A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe. Physicists generally are interested in the root or ultimate causes of Phenomenon, phenomena, and usually frame their understanding in mathematical terms. They work across a wide range of Physics#Research fields, research fields, spanning all length scales: from atom, sub-atomic and particle physics, through biological physics, to physical cosmology, cosmological length scales encompassing the universe as a whole. The field generally includes two types of physicists: Experimental physics, experimental physicists who specialize in the observation of natural phenomena and the development and analysis of experiments, and Theoretical physics, theoretical physicists who specialize in mathematical modeling of physical systems to rationalize, explain and predict natural phenomena. Physicists can apply their k ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Particle Physics
Particle physics or high-energy physics is the study of Elementary particle, fundamental particles and fundamental interaction, forces that constitute matter and radiation. The field also studies combinations of elementary particles up to the scale of protons and neutrons, while the study of combinations of protons and neutrons is called nuclear physics. The fundamental particles in the universe are classified in the Standard Model as fermions (matter particles) and bosons (force-carrying particles). There are three Generation (particle physics), generations of fermions, although ordinary matter is made only from the first fermion generation. The first generation consists of Up quark, up and down quarks which form protons and neutrons, and electrons and electron neutrinos. The three fundamental interactions known to be mediated by bosons are electromagnetism, the weak interaction, and the strong interaction. Quark, Quarks cannot exist on their own but form hadrons. Hadrons that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wave Function
In quantum physics, a wave function (or wavefunction) is a mathematical description of the quantum state of an isolated quantum system. The most common symbols for a wave function are the Greek letters and (lower-case and capital psi (letter), psi, respectively). Wave functions are complex number, complex-valued. For example, a wave function might assign a complex number to each point in a region of space. The Born rule provides the means to turn these complex probability amplitudes into actual probabilities. In one common form, it says that the squared modulus of a wave function that depends upon position is the probability density function, probability density of measurement in quantum mechanics, measuring a particle as being at a given place. The integral of a wavefunction's squared modulus over all the system's degrees of freedom must be equal to 1, a condition called ''normalization''. Since the wave function is complex-valued, only its relative phase and relative magnitud ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
