scholarly journals Simple-minded unitarity constraint and an application to unparticles

2010 ◽  
Vol 81 (5) ◽  
Author(s):  
Antonio Delgado ◽  
Matthew J. Strassler
Keyword(s):  
Unitarity Constraint

scholarly journals Unitarity constraint on the Kähler curvature

2018 ◽  
Vol 2018 (9) ◽  
Author(s):  
Yohei Ema ◽  
Ryuichiro Kitano ◽  
Takahiro Terada
Keyword(s):  
Unitarity Constraint

Spin Observables in Pion Photoproduction and Nucleon Compton Scattering from the Chiral Lagrangian and Dispersion Relations

2016 ◽  
Vol 40 ◽  
pp. 1660066
Author(s):  
A. M. Gasparyan ◽  
M. F. M. Lutz ◽  
B. Pasquini
Keyword(s):  
Compton Scattering ◽  
Pion Photoproduction ◽  
Nucleon Spin ◽  
Threshold Region ◽  
Chiral Perturbation ◽  
Spin Observables ◽  
Double Polarization ◽  
Reasonable Description ◽  
Unitarity Constraint ◽  
Chiral Lagrangian

A scheme based on the chiral Lagrangian, analyticity and unitarity is applied to spin observables in pion photoproduction and nucleon Compton scattering. Subthreshold partial-wave amplitudes are calculated in chiral perturbation theory and extrapolated beyond the threshold region imposing the micro-causality and the unitarity constraint. A reasonable description of various spin observables up to energies [Formula: see text] MeV is obtained in terms of the parameters relevant at order [Formula: see text] in the chiral Lagrangian. Nucleon spin-polarizabilities predicted in our scheme are consistent with recent measurements of double polarization asymmetries at MAMI.

UNITARITY CONSTRAINT ON GENERAL SUPERSYMMETRY ALGEBRA

1989 ◽  
Vol 04 (23) ◽  
pp. 2259-2262 ◽  
Author(s):  
KAZUNARI SHIMA ◽  
YOSHIAKI TANII
Keyword(s):  
Unitary Representations ◽  
Trivial Extension ◽  
Supersymmetry Algebra ◽  
Unitarity Constraint

The existence of massless unitary representations of the general supersymmetry algebra, which contains a vector-spinor generator, is examined. It is shown that unitary representations exist when parameters in the algebra satisfy certain relations. However, the algebra in that case turns out to be a trivial extension of the ordinary supersymmetry algebra.

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