Angel "Java" Lopez en Blog

7 de Septiembre, 2012

Publicado el 7 de Septiembre, 2012, 14:21

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Ya vieron que ando escribiendo bastante sobre Dirac. Tendría mucho para comentar sobre su influencia en la física del último siglo, y me llevaría varias decenas de posts. Su influencia se nota en prácticamente todo lo que hoy se estudia e investiga en física cuántica, siendo el fundador reconocido del tratamiento moderno de campos. Hoy, cuando se busca Higgs y su campo, hay que remontarnos a ecuaciones planteadas inicialmente por Dirac. Van hoy algunos enlaces que he visitado sobre su obra.

Paul Adrien Maurice Dirac, OM, FRS[2] (play /dɪˈræk/ di-rak; 8 August 1902 – 20 October 1984) was an English theoretical physicist who made fundamental contributions to the early development of both quantum mechanics and quantum electrodynamics. He held the Lucasian Chair of Mathematics at the University of Cambridge, was a member of the Center for Theoretical Studies, University of Miami, and spent the last decade of his life at Florida State University.

Among other discoveries, he formulated the Dirac equation, which describes the behaviour of fermions, and predicted the existence of antimatter.

Dirac shared the Nobel Prize in Physics for 1933 with Erwin Schrödinger, "for the discovery of new productive forms of atomic theory

Paul Dirac: One of the greatest British minds of the 20th century

"Of course the most famous geniuses of theoretical physics in the twentieth century were Niels Bohr, Albert Einstein, and P. A. M. Dirac. They went far beyond conceiving models or explaining some experimental facts. Einstein revolutionized our concepts of space, time and gravity. Bohr created the most important concepts necessary for dealing with atomic reality. Dirac succeeded in unifying relativity theory with quantum mechanics, leading both to the concept of antimatter and to quantum field theory, a consistent way of dealing with the interaction of matter with electromagnetic and other fields." Victor Weisskopf

Quantum Physics: Paul Dirac
The inception of quantum field theory (QFT) is usually dated 1927 with Dirac's famous paper on 'The quantum theory of the emission and absorption of radiation.' Here Dirac coined the name quantum electrodynamics (QED) which is the part of QFT that has been developed first. Dirac supplied a systematic procedure for transferring the characteristic quantum phenomenon of discreteness of physical quantities from the quantum mechanical treatment of particles to a corresponding treatment of fields. Employing the quantum mechanical theory of the harmonic oscillator, Dirac gave a theoretical description of how photons appear in the quantization of the electromagnetic radiation field.

Quantum Field Theory

Hidden behind Bohr and Einstein: Time Separation
Dirac's papers are poems, but have you seen figures there. I seem to enjoy translating his poems into cartoons.

The Quantum Theory of the Emission and Absorption of Radiation
The birth of Quantum Electrodynamics

Harmonic Oscillators as Bridges between Theories: Einstein, Dirac, and Feynman
Both Paul A. M. Dirac and Richard P. Feynman were fond of harmonic oscillators, while they used different approaches to physical problems. Both were also keenly interested in making quantum mechanics compatible with special relativity. It is shown that the coupled harmonic oscillators can bridge these two different approaches to physics.

Einstein, Dirac, and Feynman
We love Dirac and Feynman. What did they do for us?

Plate trick
In mathematics and physics, the plate trick, also known as Feynman's plate trick, Dirac's belt trick, spinor spanner or quaternionic handshake is any of several particular physical demonstrations of the mathematical theorem that SU(2) double-covers SO(3), or sometimes this fact itself. The usual demonstration, as indicated by the name, is to hold a plate on one's flat palm, then perform two subsequent rotations of the arm holding the plate which results in the original position.

Dirac Lagrangian

Dirac"s Lagrangian formalism

Bra-ket notation
Bra-ket notation is a standard notation for describing quantum states in the theory of quantum mechanics composed of angle brackets and vertical bars.
The notation was introduced in 1930 by Paul Dirac,[1] and is also known as Dirac notation.

Poisson bracket

Dirac bracket
The Dirac bracket is a generalization of the Poisson bracket developed by Paul Dirac to correctly treat systems with second class constraints in Hamiltonian mechanics and canonical quantization. It is an important part of Dirac's development of Hamiltonian mechanics to handle more general Lagrangians.

When A times B isn't B times A
Paul Dirac: The Matrix has you.

Dirac: Mathematical Details

Dirac Belt Trick

The Strangest Man
By @GrahamFarmelo

The Dirac Equation

The Dirac Equation

Dirac Equation

Heisenberg"s Matrix Mechanics and Dirac"s Re-creation of it 

Science Quotes by Paul A. M. Dirac
A great deal of my work is just playing with equations and seeing what they give.

Algunos de mis posts:

El problema de explicar spin y estadística

Dirac y la cosmología

Heisenberg, presentado por Dirac

Dirac y las amplitudes de probabilidad en física cuántica

Dirac revisando el trabajo de Heisenberg

Erwin Schrödinger creando su ecuación, por P.A.M.Dirac

Grupos y Física, por Dirac

P.A.M. Dirac, por Abdus Salam

Dirac y Feynman, por Abdul Salam

Entrevista a P.A.M.Dirac, por Abdus Salam

Física cuántica (Parte 6) Bra y Kets

Pauli, Dirac, Heisenberg y la religión

Dirac según Gamow 

La necesidad de una teoría cuántica, por Dirac

Paul Adrien Maurice Dirac por Abraham Pais

Paul Adrien Maurice Dirac, por Stephen Hawking

Mis Enlaces

Nos leemos!

Angel "Java" Lopez

Por ajlopez, en: Ciencia