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Light as a particle
Light as a particle

... curved, as shown in the diagram. However, since vacuum is a good insulator, any electrons that reach the top plate are prevented from responding to the electrical attraction by jumping back across the gap. Instead they are forced to make their way around the circuit, passing through an ammeter. The ...
Nonequilibrium translational effects in evaporation and condensation
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... strengthen the thermodynamic basis for this important phenomenon. We shall present a detailed mesoscopic formulation, starting with the macroscopic one, in order to define proper boundary conditions. As new variables we introduce the condensation coordinate, called the reaction coordinate by Nagayam ...
Lesson 8 - Oregon State University
Lesson 8 - Oregon State University

... Perturbation Theory • Up to now, we have restricted our attention primarily to the solution of problems where things were not changing as a fucntion of time, ie, nuclear structure calculations. Now we shall take up the issue of transitions from one state to another. • To do so, we need to introduce ...
Proposal for Translational Entanglement of Dipole
Proposal for Translational Entanglement of Dipole

... off the field inducing the LIDDI, and separate the two lattices by changing the laser-beam angles. By increasing U0 , the atoms lose their hopping ability and their quantum state is ‘‘frozen’’ with a large effective mass: the bandwidth VB decreases exponentially with U0 and the effective mass increa ...
Chapter 5 PPT
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... Electric field is zero everywhere within the conductor. Any excess charge field on an isolated conductor resides entirely on its surface. The electric field just outside a charged conductor is perpendicular to the conductor’s surface. On an irregular shaped conductor, the charge tends to accumulate ...
Book of Abstracts
Book of Abstracts

... factor between consecutive three-body states. Additionally, the existence of two independent interaction parameters, one between the unlike species, and one between the same species, enables few-body phenomena that have no counterexamples in the homonuclear case [1]. Here we present our recent measu ...
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... quantum physics. They are almost everywhere, and everything is considered to be an effective field theory (EFT). Particle physicists, for example, even take a supposed-tobe fundamental theory such as the celebrated Standard Model of the electromagnetic, weak, and strong interactions to be an EFT (Meis ...
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Atomic Physics

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... the right side is the density of the fluid and has nothing to do with the object in the fluid. Thus, the bouyant force only depends on the volume of the object and the density of the fluid. It does not depend on the density or weight of the object itself. Although the formula was derived using a cyl ...
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... in invariant theory and representation theory, Klyachko exhibited an algorithm for computing all such Pauli-like constraints [4,8]. In fact, his work is part of a more general effort in quantum information theory addressing the quantum marginal problem which asks when a given set of single-site redu ...
Physics 207: Lecture 2 Notes
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... simple point mass under the influence of external forces:  We can use it to relate F and a like we are used to doing. It tells us that if FEXT = 0, the total momentum of the system does not change.  As the woman moved forward in the boat, the boat went backward to keep the center of mass at the sa ...
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Additional acceleration of solar-wind particles in current sheets of
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... when the magnetic field components change their signs, normally assigned to a current sheet origin (“the classic” sector boundary, or the heliospheric current sheet midplane), differ from the times when electrons change their angles by 180◦ , or make “U turns”. In the other words, there are noticeab ...
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Elementary particle



In particle physics, an elementary particle or fundamental particle is a particle whose substructure is unknown, thus it is unknown whether it is composed of other particles. Known elementary particles include the fundamental fermions (quarks, leptons, antiquarks, and antileptons), which generally are ""matter particles"" and ""antimatter particles"", as well as the fundamental bosons (gauge bosons and Higgs boson), which generally are ""force particles"" that mediate interactions among fermions. A particle containing two or more elementary particles is a composite particle.Everyday matter is composed of atoms, once presumed to be matter's elementary particles—atom meaning ""indivisible"" in Greek—although the atom's existence remained controversial until about 1910, as some leading physicists regarded molecules as mathematical illusions, and matter as ultimately composed of energy. Soon, subatomic constituents of the atom were identified. As the 1930s opened, the electron and the proton had been observed, along with the photon, the particle of electromagnetic radiation. At that time, the recent advent of quantum mechanics was radically altering the conception of particles, as a single particle could seemingly span a field as would a wave, a paradox still eluding satisfactory explanation.Via quantum theory, protons and neutrons were found to contain quarks—up quarks and down quarks—now considered elementary particles. And within a molecule, the electron's three degrees of freedom (charge, spin, orbital) can separate via wavefunction into three quasiparticles (holon, spinon, orbiton). Yet a free electron—which, not orbiting an atomic nucleus, lacks orbital motion—appears unsplittable and remains regarded as an elementary particle.Around 1980, an elementary particle's status as indeed elementary—an ultimate constituent of substance—was mostly discarded for a more practical outlook, embodied in particle physics' Standard Model, science's most experimentally successful theory. Many elaborations upon and theories beyond the Standard Model, including the extremely popular supersymmetry, double the number of elementary particles by hypothesizing that each known particle associates with a ""shadow"" partner far more massive, although all such superpartners remain undiscovered. Meanwhile, an elementary boson mediating gravitation—the graviton—remains hypothetical.
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