1 tribute to daniel gogny 08/12/15 detours may (sometime) be the best way, views from former...
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3 Tribute to Daniel Gogny 08/12/15 Daniel’s program 1981: nucleon-nucleon interaction, looking for a deeper insight justification from Quantum Chromodynamics Using tools with proven efficiency: Effective force variational methods and mean field theory An intricate topic with severe issues, gauge invariance, renormalisation … But interesting resultsTRANSCRIPT
1 Tribute to Daniel Gogny 08/12/15
Detours may (sometime) be the best way,
views from former physicists
D. Iracane & P. Chaix, CEA/Saclay
2 Tribute to Daniel Gogny 08/12/15
Being a disciple of Daniel Gogny approach
In 1982, Daniel Gogny was searching in QFT some rationale for his successful Force
Later in the 80s, the Strategic Defense US initiative raised questions about the Free Electron Laser operational capacities
Fundamental approaches within an “applied science organization”:Questions arising from operational considerations.
Work for a deep understanding,in an open, free and rigorous approach.
Push (when possible) up to the end of the story,whatever the detours, to get robust results.
Fun and excitement!
3 Tribute to Daniel Gogny 08/12/15
Daniel’s program1981: nucleon-nucleon interaction, looking for a deeper
insight justification from Quantum Chromodynamics
Using tools with proven efficiency: Effective force variational methods and mean field theory
An intricate topic with severe issues, gauge invariance, renormalisation …
But interesting results
4 Tribute to Daniel Gogny 08/12/15
Looking for an attractive channel, the effective force, a tricky point
Numerical and Mathematical analysis exhibits a competition between 2 phases:- Supraconducting condensate- Bose-Einstein condensate
Gluon condensate studywithin Hartree Fock Bogoliubov mean field theory
5 Tribute to Daniel Gogny 08/12/15
Getting deeper insight relativistic N-body mean field theory
In Quantum Electrodynamics
A domain where forces are well known … … with operational stakes
COMPUTATION OF HEAVY IONS/ATOMS
6 Tribute to Daniel Gogny 08/12/15
From numerical relativistic atomic calculations with Density Functional method
Result in accurate eigenstatesPlus …
A “Spurious” eigenstate
Dirac Hamiltonian with Coulomb interaction bounded from below ?
Hydrogen-like Iron
UU
Z > 137 = 1/α
7 Tribute to Daniel Gogny 08/12/15
… back to fundamental issues
The BDF QED vacuum is stable if α < 4/π(by « chance », α = 1/137 < 4/ π …)
What is the vacuum of QEDfor relativistic Bogoliubov-Dirac-Fock
variational calculations of atoms?
8 Tribute to Daniel Gogny 08/12/15
Meanwhile, the SDIO in USA …
Large power Free Electrons Laser
Operational capacities for Defence applications ?
The ELSA high power, long pulse FEL in CEA
9 Tribute to Daniel Gogny 08/12/15
The non-lineal spectral broadening
←Main frequency F1
←So-called « Sideband » F2
←new effect F3=f(F1,F2)
10 Tribute to Daniel Gogny 08/12/15
11 Tribute to Daniel Gogny 08/12/15
Exp. Num. Theory
Consistent numerical, theoretical and experimental results
12 Tribute to Daniel Gogny 08/12/15
Operational results: FEL can store a significant power …
… by loosing laser coherence
Except if…
13 Tribute to Daniel Gogny 08/12/15
A part of the heritage: How to identify the most important texts