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Topic: Fermi theory


In the News (Sun 29 Nov 09)

  
  Enrico Fermi - Wikipedia, the free encyclopedia
Enrico Fermi (September 29, 1901–November 28, 1954) was an Italian physicist most noted for his work on beta decay, the development of the first nuclear reactor, and for the development of quantum theory.
In 1938, Fermi won the Nobel Prize in Physics for his "demonstrations of the existence of new radioactive elements produced by neutron irradiation, and for his related discovery of nuclear reactions brought about by slow neutrons".
On November 28, 1954, Fermi died at the age of 53 of stomach cancer in Chicago, Illinois and was interred there in Oak Woods Cemetery.
en.wikipedia.org /wiki/Enrico_Fermi   (1548 words)

  
 Fermi's interaction - Wikipedia, the free encyclopedia
In physics, Fermi's interaction is an old explanation of the weak force, proposed by Enrico Fermi.
The solution is to replace the four-fermion contact interaction by a more complete theory (see UV completion) — an exchange of a W boson or a Z boson as explained in the electroweak theory.
Before the electroweak theory and the Standard Model were constructed, George Sudarshan and Robert Marshak, and also independently Richard Feynman and Murray Gell-Mann were able to determine the correct tensor structure (vector minus axial vector, V−A) of the four-fermion interaction.
en.wikipedia.org /wiki/Fermi's_interaction   (167 words)

  
 Enrico Fermi | Physicist
Fermi settled in the United States in 1939, and became professor of physics at Columbia University in New York City.
Fermi was placed in charge of the Manhattan Project at the University of Chicago in 1942.
Laura Fermi traces her husband's career from his childhood, when he taught himself physics, through his rise in the Italian university system concurrent with the rise of fascism, to his receipt of the Nobel Prize, which offered a perfect opportunity to flee the country without arousing official suspicion, and his odyssey to the United States.
www.lucidcafe.com /library/95sep/fermi.html   (652 words)

  
 Enrico Fermi - Biography
Enrico Fermi was born in Rome on 29th September, 1901, the son of Alberto Fermi, a Chief Inspector of the Ministry of Communications, and Ida de Gattis.
In 1944, Fermi became American citizen, and at the end of the war (1946) he accepted a professorship at the Institute for Nuclear Studies of the University of Chicago, a position which he held until his untimely death in 1954.
Fermi was member of several academies and learned societies in Italy and abroad (he was early in his career, in 1929, chosen among the first 30 members of the Royal Academy of Italy).
nobelprize.org /nobel_prizes/physics/laureates/1938/fermi-bio.html   (975 words)

  
 Thomas-Fermi Theory (ResearchIndex)   (Site not responding. Last check: 2007-11-07)
Sometimes called the `statistical theory', it was invented by L. Home/Search Context Related
1 The ThomasFermi theory of atoms, molecules and solids (context) - LIEB, SIMON - 1977
1 the stability of molecules in Thomas-Fermi theory (context) - TELLER - 1962
citeseer.ist.psu.edu /428881.html   (383 words)

  
 Fermi's Paradox
Fermi realized that any civilization with a modest amount of rocket technology and an immodest amount of imperial incentive could rapidly colonize the entire Galaxy.
Kaluza-Klein theory fails to resolve several problems, especially in the quantum realm, but the idea of using extra dimensions is revisited in the early 1980's.
While it may be an effective theory that works at low energies, it cannot be the final theory of everything, mostly because of a problem with infinities.
zebu.uoregon.edu /~js/cosmo/lectures/lec28.html   (2363 words)

  
 [No title]   (Site not responding. Last check: 2007-11-07)
The fact that Thomas-Fermi theory is asymptotically correct in the limit of large nuclear charge is a classical result due to Lieb and Simon~\cite{LS}.
We shall however also use Thomas-Fermi theory for other values of this parameter and we therefore allow it to be arbitrary for the moment.
We consider the following function: \begin{equation} \label{eq:tf1} f^\beta({\cal R,Z})= \febe+\cf\sum^M_{J=1}Z_j^{7/3} \end{equation} Using the scaling properties of Thomas-Fermi theory we have \begin{equation} \label{eq:tf2} f^\beta({\cal R,Z})=\overline{Z}^{7/3}f^\beta\left(\overline{Z}^{1/3}{\cal R},\overline{Z}^{-1}{\cal Z}\right) \end{equation} In \cite{BL} the asymptotics of $\lambda^7f^\beta(\lambda{\cal R},{\cal Z})$ for large $\lambda$ was studied in the case of a finite number of nuclei.
www.ma.utexas.edu /mp_arc/papers/98-644   (4301 words)

  
 Fermi Theory of Beta Decay   (Site not responding. Last check: 2007-11-07)
By 1934, Enrico Fermi had developed a theory of beta decay to include the neutrino, presumed to be massless as well as chargeless.
Straightforward in concept, Fermi's Golden Rule says that the transition rate is proportional to the strength of the coupling between the initial and final states factored by the density of final states available to the system.
But the nature of the interaction which led to beta decay was unknown in Fermi's time (the weak interaction).
hyperphysics.phy-astr.gsu.edu /hbase/quantum/fermi2.html   (218 words)

  
 The Fermi Paradox: An Approach Based on Percolation Theory
Many proposals for solutions to the Fermi paradox exist, all of which are unsatisfactory in one way or another [3].
Proposed solutions to the Fermi paradox either deny the possibility of extraterrestrial civilizations [1, 5], an assumption as yet unwarranted, or accept the possibility of extraterrestrial technological civilizations and propose explanations for why such civilizations may nevertheless not have colonized the galaxy.
I propose a model for the problem based on the assumption that long-term colonization of the galaxy proceeds via a "percolation" process similar to the percolation problem which is well studied in condensed-matter physics.
www.sff.net /people/Geoffrey.Landis/percolation.htp   (2469 words)

  
 [No title]
\bibitem{LR69} {\em An exact quantum theory of the time-dependent harmonic oscillator and of a charged particle in a time-dependent electromagnetic field}, H.R. Lewis, Jr., and W. Riesenfeld, J. Math.
\bibitem{NS87} {\em Time-dependent density-functional theory in the linear-response regime}, T.K. Ng and K.S. Singwi, Phys.
\bibitem{GSB95} {\em A density functional theory study of frequency-dependent polarizabilities and Van der Waals dispersion coefficients for polyatomic molecules}, S.J.A. van Gisbergen, J.G. Snijders, and E.J. Baerends, J. Chem.
dft.rutgers.edu /tex/refers.txt   (12557 words)

  
 The Pion Beta Decay Experiment and A Remeasurement of the Panofsky Ratio - 2.1.1 Fermi Theory of the Beta Decay
Fermi's idea was to compare the four-fermion point interaction as an interaction of two currents in analogy to the electromagnetic interaction.
Fermi consequently introduced the weak current that decomposes into a hadronic and a leptonic current.
Using the picture of second quantization (field quantization) the transition operator can be pictured as annihilator of the particle of the right hand side and creator of the particle on the left hand side.
pibeta.web.psi.ch /docs/publications/tom_diss/html/web_diss-2.1.1.html   (1343 words)

  
 RG and FLT   (Site not responding. Last check: 2007-11-07)
The Fermi liquid fixed point Hamiltonian with its leading order corrections is identified and we show that the mean field calculations for this model correspond to the Landau phenomenological approach.
We then show how these results can be deduced by a reorganization of perturbation theory, in close parallel to that for the renormalized $\phi^4$ field theory.
The parameters specifying the Fermi liquid fixed point Hamiltonian are related to the renormalized vertices appearing in the perturbation theory.
www.ma.ic.ac.uk /~ahewson/RGFLT.html   (350 words)

  
 Electroweak Theory   (Site not responding. Last check: 2007-11-07)
The first two lectures will be a rapid non-mathematical overview of the electroweak theory and its development.
Handouts are available for the theory session of the course.
A series of six homeworks will be used to illustrate material and complete derivations where the framework is set up in the lectures.
www.shef.ac.uk /physics/teaching/phy604/electroweak.html   (224 words)

  
 Fermi Theory of Beta Decay   (Site not responding. Last check: 2007-11-07)
The Matrix Element in the Fermi Theory of Beta Decay
The Shape Factor in the Fermi Theory of Beta Decay
The Fermi Function in the Fermi Theory of Beta Decay
hyperphysics.phy-astr.gsu.edu /HBASE/quantum/fermi3.html   (30 words)

  
 An inversion theorem in Fermi surface theory (ResearchIndex)   (Site not responding. Last check: 2007-11-07)
An inversion theorem in Fermi surface theory (ResearchIndex)
Abstract: We prove a perturbative inversion theorem for the map between the interacting and the noninteracting Fermi surface for a class of many fermion systems with strictly convex Fermi surfaces and short-range interactions between the fermions.
This theorem gives a physical meaning to the counterterm function K that we use in the renormalization of these models: K can be identi ed as that part of the self{energy that causes the deformation of the Fermi surface when the interaction is turned on.
citeseer.ist.psu.edu /315230.html   (272 words)

  
 The positivity of the pressure in Thomas-Fermi theory, R. Benguria, E. H. Lieb
The positivity of the pressure in Thomas-Fermi theory, R. Benguria, E. Lieb
The positivity of the pressure in Thomas-Fermi theory
Erratum : Erratum: ``The positivity of the pressure in Thomas-Fermi theory''.
projecteuclid.org /getRecord?id=euclid.cmp/1103904562   (41 words)

  
 Local Fermi Liquid Theory   (Site not responding. Last check: 2007-11-07)
We develop the theory of a Fermi Liquid with the microscopic constraint of a local self-energy.(J. Engelbrecht and K. Bedell, Phys.
For such a Local Fermi Liquid, the forward scattering sum-rule imposes strong limitations on the Fermi-Liquid parameters, which rule out any Pomeranchek instabilities.
For both attractive and repulsive interactions a Local Fermi Liquid is robust against instabilities towards ferromagnetism and phase separation.
flux.aps.org /meetings/BAPSMAR96/abs/S2980001.html   (123 words)

  
 Fefferman, Seco: The mathematics of large atoms
[CFS1] Córdoba, A. Fefferman, C. Seco, L. «A Trigonometric Sum relevant to the Non-relativistic Theory of Atoms» Proc.
[En] Englert, B. «Semiclassical Theory of the Atom» Springer Verlag Lecture Notes in Physics, vol 301.
[LS] Lieb, E. and Simon, B. «Thomas-Fermi Theory of Atoms, Molecules and Solids» Adv.
www.numdam.org /numdam-bin/item?id=JEDP_1995____A11_0   (493 words)

  
 Introduction
Devising accurate schemes to approximate the many-electron problem has been an important goal since the founding of quantum mechanics in the early
Several notable advances have been made, starting from Thomas-Fermi theory in the late
A significant leap in electronic structure theory was made in
portellen.phycmt.dur.ac.uk /sjc/thesis_ppr/node5.html   (919 words)

  
 Equations of State of Elements from the Thomas-Fermi Theory
Equations of State of Elements from the Thomas-Fermi Theory
An investigation of the equations of state of elements as given by the Thomas-Fermi theory has been carried out in a region corresponding to higher pressures than have hitherto been discussed in detail.
In particular, reselling and systematic downloading of files is prohibited.
stacks.iop.org /0370-1298/68/726   (239 words)

  
 Fermilab Theory Seminars—2006
Towards a High Energy Theory for the Ghost Condensate
Systems of Two Heavy Quarks with Effective Field Theories
Inclusive Semileptonic B Decays in Soft-Collinear Effective Theory
theory.fnal.gov /seminars/seminars.html   (163 words)

  
 Landau Fermi-Liquid Theory Concepts and Applications Condition: New - SHOP.COM
ISBN: 0471824186 Publisher: John Wiley & Sons Inc Description: A professional reference for physicists working in condensed matter physics as well as in nuclear physics and astrophysics, on Landau's theory of Fermi liquids--a vital theory of both...
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www.shop.com /op/aprod-p33554733   (229 words)

  
 Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
Availability information may be found in the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or via the "Full-text Availability" link.
For a journal article, please see the Resource Relation field.
; Vol/Issue: 10; International symposium on atomic, molecular and solid-state theory and quantum statistics; 19 Jan 1976; Sanibel, FL, USA
www.osti.gov /energycitations/product.biblio.jsp?osti_id=6586913   (116 words)

  
 University of Chicago Particle Theory Group   (Site not responding. Last check: 2007-11-07)
This is the home page for the Particle Theory Group at the Enrico Fermi Institute, University of Chicago.
Our research covers a wide variety of topics, including string theory, field theory, particle phenomenology, mathematical physics, gravitation, and cosmology.
For more details see our research description at the Physics Department web site.
hamilton.uchicago.edu   (61 words)

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