scholarly journals Spectral properties of mesons in hot and dense matter from energy weighted sum rules

2010 ◽  
Author(s):  
D. Cabrera ◽  
A. Polls ◽  
A. Ramos ◽  
L. Tolós ◽  
Juan M. Nieves ◽  
...  
Keyword(s):  
Spectral Properties ◽  
Sum Rules ◽  
Dense Matter ◽  
Weighted Sum ◽  
Properties Of Mesons

scholarly journals Energy-weighted sum rules for mesons in hot and dense matter

2009 ◽  
Vol 80 (4) ◽  
Author(s):  
D. Cabrera ◽  
A. Polls ◽  
A. Ramos ◽  
L. Tolós
Keyword(s):  
Sum Rules ◽  
Dense Matter ◽  
Weighted Sum

THE ENERGY-WEIGHTED SUM RULE IN THE NAMBU-JONA-LASINIO MODEL AND THE PROPERTIES OF MESONS (π, π′)

1992 ◽  
Vol 07 (03) ◽  
pp. 207-213
Author(s):  
C.A. DE SOUSA
Keyword(s):  
Sum Rules ◽  
Weighted Sum ◽  
Chiral Perturbation ◽  
Qcd Sum Rules ◽  
Sum Rule ◽  
Njl Model ◽  
Properties Of Mesons

Vacuum and pionic properties are discussed in the context of the NJL model, using the energy-weighted sum rule which is saturated taking into account the contribution of the π(1300) resonance other than the low-lying pionic mode. Although the simplicity of our assumption the method used here establishes a connection between genuine QCD parameters and hadronic quantities. The results are qualitatively in agreement with important conclusions obtained by sophisticated QCD-inspired approaches as the so-called QCD sum rules or chiral perturbation theories.

A statistical approach to perturbation theory and inverse‐energy‐weighted sum rules

1981 ◽  
Vol 22 (12) ◽  
pp. 2961-2967 ◽  
Author(s):  
Thirumala Raya Halemane
Keyword(s):  
Perturbation Theory ◽  
Statistical Approach ◽  
Sum Rules ◽  
Weighted Sum

Polarization propagator calculations of frequency-dependent polarizabilities, Verdet constants, and energy weighted sum rules

1978 ◽  
Vol 68 (6) ◽  
pp. 2527 ◽  
Author(s):  
Poul Jo̸rgensen ◽  
Jens Oddershede ◽  
Nelson H. F. Beebe
Keyword(s):  
Sum Rules ◽  
Weighted Sum ◽  
Frequency Dependent ◽  
Polarization Propagator

Generalized isospin sum rule: an application to magnetic transitions

1984 ◽  
Vol 62 (8) ◽  
pp. 764-770 ◽  
Author(s):  
John A. Montgomery ◽  
Kwang-Bock Yoo ◽  
Herbert Überall ◽  
B. Bosco
Keyword(s):  
Magnetic Dipole ◽  
Electron Scattering ◽  
Sum Rules ◽  
Experimental Results ◽  
Weighted Sum ◽  
Magnetic Transitions ◽  
Sum Rule ◽  
Numerical Predictions ◽  
Magnetic Dipole Transitions ◽  
Special Case

Energy-weighted sum rules with separated isospin contributions for arbitrary operators and multipolarities are developed for photonuclear and electron-scattering transitions. The Kurath sum rule is contained as a special case. Applying the sum rule to magnetic dipole transitions, ensuing numerical predictions for non-self-conjugate nuclei are compared with experimental results.

Relation between the energy-weighted sum rules for nuclear photoabsorption and nuclear muon capture

1975 ◽  
Vol 11 (6) ◽  
pp. 1894-1898 ◽  
Author(s):  
B. Goulard ◽  
H. Primakoff
Keyword(s):  
Sum Rules ◽  
Muon Capture ◽  
Weighted Sum

scholarly journals The influence of the nuclear surface diffuseness on the transition charge densities.

2019 ◽  
Vol 3 ◽  
pp. 104
Author(s):  
T. S. Kosmas ◽  
J. D. Vergados
Keyword(s):  
Sum Rules ◽  
Form Factors ◽  
Scattering Data ◽  
Nuclear Surface ◽  
Weighted Sum ◽  
Transition Form ◽  
Charge Densities ◽  
Nuclear Ground State ◽  
Surface Diffuseness ◽  
Model Approach

Proton partial occupancies of the nuclear surface orbits are used in a modified shell model approach to study isoscalar dipole transition charge densities and form factors for self-conjugate nuclei. The energy-weighted sum-rules of Harakeh-Dieperink for both the transition form factor and transition charge density are modified so as fractional occupation probabilities of the states may be used. The partial occupancies of the surface n/j-levels are determined by fitting to the experimental inelastic scattering data and compared with those found previously in the study of nuclear ground state properties

Spectral Properties

2018 ◽  
Author(s):  
Klaus Morawetz
Keyword(s):  
Correlation Function ◽  
Spectral Function ◽  
Spectral Properties ◽  
Sum Rules ◽  
Statistical Weight ◽  
Reduced Density Matrix ◽  
Density Of State ◽  
Shell Motion ◽  
Reduced Density ◽  
Quasiparticle Picture

The spectral properties of the nonequilibrium Green’s functions are explored. Causality and sum rules are shown to be completed by the extended quasiparticle picture. The off-shell motion is seen to become visible in satellite structures of the spectral function. Different forms of ansatz to reduce the two-time Green’s function to a one-time reduced density matrix are discussed with respect to the consistency to other approximations. We have seen from the information contained in the correlation function that the statistical weight of excitations with which the distributions are populated are given by the spectral function. This momentum-resolved density of state can be found by the retarded and advance functions.

scholarly journals Energy Weighted Sum Rules for Spin-Dependent Excitations of Nuclei

1980 ◽  
Vol 63 (5) ◽  
pp. 1599-1607 ◽  
Author(s):  
S. Nishizaki ◽  
K. Ando
Keyword(s):  
Sum Rules ◽  
Weighted Sum

scholarly journals Energy-weighted sum rules, y-scaling and duality

2003 ◽  
Vol 17 (3) ◽  
pp. 391-395 ◽  
Author(s):  
J.W. Van Orden ◽  
S. Jeschonnek
Keyword(s):  
Sum Rules ◽  
Weighted Sum
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