Angel "Java" Lopez en Blog

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.

http://en.wikipedia.org/wiki/Paul_Dirac

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
http://www.telegraph.co.uk/technology/4436537/Paul-Dirac-One-of-the-greatest-British-minds-of-the-20th-century.html

P.A.M.Dirac
http://www.lucasianchair.org/20/dirac.html
"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
http://www.spaceandmotion.com/physics-paul-dirac.htm
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
http://plato.stanford.edu/entries/quantum-field-theory/

Hidden behind Bohr and Einstein: Time Separation
http://www.ysfine.com/einstein/einbohr.html
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
http://www.ffn.ub.es/luisnavarro/nuevo_maletin/Dirac_QED_1927.pdf
The birth of Quantum Electrodynamics

Harmonic Oscillators as Bridges between Theories: Einstein, Dirac, and Feynman
http://arxiv.org/abs/quant-ph/0411017
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
http://www.ysfine.com/maga/dirfey.html
We love Dirac and Feynman. What did they do for us?

Plate trick
http://en.wikipedia.org/wiki/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
http://en.wikipedia.org/wiki/Lagrangian#Dirac_Lagrangian

Dirac"s Lagrangian formalism
http://www.toequest.com/forum/quantum-physics/742-dirac-s-lagrangian-formalism.html

Bra-ket notation
http://en.wikipedia.org/wiki/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
http://en.wikipedia.org/wiki/Poisson_bracket

Dirac bracket
http://en.wikipedia.org/wiki/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
http://www.guardian.co.uk/science/life-and-physics/2011/jan/29/1?CMP=twt_gu
Paul Dirac: The Matrix has you.

Dirac: Mathematical Details
http://gregegan.customer.netspace.net.au/APPLETS/21/DiracNotes.html

Dirac Belt Trick
http://gregegan.customer.netspace.net.au/APPLETS/21/21.html

The Strangest Man
http://www.facebook.com/pages/The-Strangest-Man/105128831946
By @GrahamFarmelo

The Dirac Equation
http://www.mathpages.com/home/kmath654/kmath654.htm

The Dirac Equation
http://electron6.phys.utk.edu/qm2/modules/m9/dirac.htm

Dirac Equation
http://en.wikipedia.org/wiki/Dirac_equation

Heisenberg"s Matrix Mechanics and Dirac"s Re-creation of it
http://www.worldscibooks.com/etextbook/7271/7271_chap02.pdf 

Science Quotes by Paul A. M. Dirac
http://www.todayinsci.com/D/Dirac_Paul/DiracPaul-Quotations.htm
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
http://ajlopez.zoomblog.com/archivo/2011/01/11/el-problema-de-explicar-spin-y-estadis.html

Dirac y la cosmología
http://ajlopez.zoomblog.com/archivo/2007/08/27/dirac-y-las-cosmologia.html

Heisenberg, presentado por Dirac
http://ajlopez.zoomblog.com/archivo/2007/08/22/heisenberg-presentado-por-Dirac.html

Dirac y las amplitudes de probabilidad en física cuántica
http://ajlopez.zoomblog.com/archivo/2011/03/17/dirac-y-las-amplitudes-de-probabilidad.html

Dirac revisando el trabajo de Heisenberg
http://ajlopez.zoomblog.com/archivo/2011/03/15/dirac-revisando-el-trabajo-de-Heisenbe.html

Erwin Schrödinger creando su ecuación, por P.A.M.Dirac
http://ajlopez.zoomblog.com/archivo/2011/03/12/erwin-Schrdinger-creando-su-ecuacion-p.html

Grupos y Física, por Dirac
http://ajlopez.zoomblog.com/archivo/2011/01/22/grupos-y-Fisica-por-Dirac.html

P.A.M. Dirac, por Abdus Salam
http://ajlopez.zoomblog.com/archivo/2010/08/19/pam-Dirac-por-Abdus-Salam.html

Dirac y Feynman, por Abdul Salam
http://ajlopez.zoomblog.com/archivo/2010/08/24/dirac-y-Feynman-por-Abdul-Salam.html

Entrevista a P.A.M.Dirac, por Abdus Salam
http://ajlopez.zoomblog.com/archivo/2010/10/02/entrevista-a-Pamdirac-por-Abdus-Salam.html

Física cuántica (Parte 6) Bra y Kets
http://ajlopez.zoomblog.com/archivo/2011/03/26/fisica-cuantica-Parte-6-Bra-y-Kets.html

Pauli, Dirac, Heisenberg y la religión
http://ajlopez.zoomblog.com/archivo/2010/07/04/pauli-Dirac-Heisenberg-y-la-religion.html

Dirac según Gamow
http://ajlopez.zoomblog.com/archivo/2009/03/20/dirac-segun-Gamow.html 

La necesidad de una teoría cuántica, por Dirac
http://ajlopez.zoomblog.com/archivo/2012/07/24/la-necesidad-de-una-teoria-cuantica-po.html

Paul Adrien Maurice Dirac por Abraham Pais
http://ajlopez.zoomblog.com/archivo/2012/07/22/paul-Adrien-Maurice-Dirac-por-Abraham-.html

Paul Adrien Maurice Dirac, por Stephen Hawking
http://ajlopez.zoomblog.com/archivo/2012/07/15/paul-Adrien-Maurice-Dirac-por-Stephen-.html

Mis Enlaces

http://www.delicious.com/ajlopez/dirac

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
http://twitter.com/ajlopez

Por ajlopez, en: Ciencia