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local - Physics
local - Physics

Electrical Charge
Electrical Charge

Possible large-N fixed-points and naturalness for O(N) scalar fields
Possible large-N fixed-points and naturalness for O(N) scalar fields

6 Field-Theoretical Methods in Quantum Magnetism
6 Field-Theoretical Methods in Quantum Magnetism

Ground-state properties of the attractive one
Ground-state properties of the attractive one

The physics and geometry of fracture and frustration
The physics and geometry of fracture and frustration

Quantum transport signatures of chiral edge states in Sr2RuO4
Quantum transport signatures of chiral edge states in Sr2RuO4

These notes
These notes

... renormalized coefficients. The theoretical tools corresponding to this physics have involved sophisticated diagramatic techniques such as Feynman diagrams, which are all based on the existence of a well controlled limit of zero interaction Green’s function. It was realized in the fifties, with the t ...
fluka-models
fluka-models

neutrino
neutrino

Matrix Product States for Lattice Gauge Theories
Matrix Product States for Lattice Gauge Theories

... In a perturbative treatment, one uses series expansions of transition amplitudes to obtain physical predictions. At a pictorially level the coefficients of these power series expansions can be represented by the well known Feynman diagrams which can be classified by the order of the coupling constan ...
Neutral Weak Interactions
Neutral Weak Interactions

An introduction to topological phases of electrons
An introduction to topological phases of electrons

1911
1911

... The question of the stability of the atom proposed need not be considered at this stage, for this will obviously depend upon the minute structure of the atom, and on the motion of the constituent charged parts. In order to form some idea of the forces required to deflect an a particle through a larg ...
Heisenberg Groups and Noncommutative Fluxes
Heisenberg Groups and Noncommutative Fluxes

Lecture notes: Group theory and its applications in physics
Lecture notes: Group theory and its applications in physics

Unitary quantum theory as a formal framework for a
Unitary quantum theory as a formal framework for a

Phases of Matter and Phase Transitions
Phases of Matter and Phase Transitions

Document
Document

Quantum Darwinism as a Darwinian process - Non
Quantum Darwinism as a Darwinian process - Non

... of Los Alamos National Laboratory and colleagues has spanned more than 25 years and has identified and developed a number of novel processes and constructs. The most important of these might include: decoherence, einselection, envariance and the theory of Quantum Darwinism. The theoretical advances ...
Roland Katz –15/01/2015
Roland Katz –15/01/2015

The Scattering of α and β Particles by Matter and the
The Scattering of α and β Particles by Matter and the

... deflexions of more than a right angle at a single encounter. They found, for example, that a small fraction of the incident α particles, about 1 in 20,000 turned through an average angle of 90 degrees in passing through a layer of gold–foil about .00004 cm. thick, which was equivalent in stopping po ...
thesis
thesis

Introduction - Princeton University Press
Introduction - Princeton University Press

< 1 ... 17 18 19 20 21 22 23 24 25 ... 120 >

Quantum chromodynamics

In theoretical physics, quantum chromodynamics (QCD) is the theory of strong interactions, a fundamental force describing the interactions between quarks and gluons which make up hadrons such as the proton, neutron and pion. QCD is a type of quantum field theory called a non-abelian gauge theory with symmetry group SU(3). The QCD analog of electric charge is a property called color. Gluons are the force carrier of the theory, like photons are for the electromagnetic force in quantum electrodynamics. The theory is an important part of the Standard Model of particle physics. A huge body of experimental evidence for QCD has been gathered over the years.QCD enjoys two peculiar properties:Confinement, which means that the force between quarks does not diminish as they are separated. Because of this, when you do separate a quark from other quarks, the energy in the gluon field is enough to create another quark pair; they are thus forever bound into hadrons such as the proton and the neutron or the pion and kaon. Although analytically unproven, confinement is widely believed to be true because it explains the consistent failure of free quark searches, and it is easy to demonstrate in lattice QCD.Asymptotic freedom, which means that in very high-energy reactions, quarks and gluons interact very weakly creating a quark–gluon plasma. This prediction of QCD was first discovered in the early 1970s by David Politzer and by Frank Wilczek and David Gross. For this work they were awarded the 2004 Nobel Prize in Physics.The phase transition temperature between these two properties has been measured by the ALICE experiment to be well above 160 MeV. Below this temperature, confinement is dominant, while above it, asymptotic freedom becomes dominant.
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