Form factors in RQM approaches: Constraints from space-time translations
نویسندگان
چکیده
منابع مشابه
Form factors in RQM approaches: constraints from space-time translations, extension to constituents with spin-1/2 and unequal masses
Constraints related to transformations of currents under space-time translations have been considered for the relativistic quantum mechanics calculation of form factors of J = 0 systems composed of scalar constituents with equal masses. Accounting for these constraints amounts to take into account many-body currents that restore the equality of the momentum transferred separately to the system ...
متن کاملForm factors in relativistic quantum mechanic: constraints from space-time translations
The comparison of form factors calculated from a single-particle current in different relativistic quantum mechanic approaches evidences tremendous discrepancies. The role of constraints coming from space-time translations is considered here with this respect. It is known that invariance under these translations implies the energy-momentum conservation relation that is usually assumed to hold g...
متن کامل5 Form Factors in Relativistic Quantum Mechanics Approaches and Space - Time Translation Invariance
Invariance of form factors under Lorentz boosts is a criterion often advocated to determine whether their estimate in a RQM framework is reliable. It is shown that verifying relations stemming from covariance properties under space-time translations could be a more important criterion. Form factors calculated in different approaches for a simple system are discussed with these various respects....
متن کاملGeometric inequalities from phase space translations
We establish a quantum version of the classical isoperimetric inequality relating the Fisher information and the entropy power of a quantum state. The key tool is a Fisher information inequality for a state which results from a certain convolution operation: the latter maps a classical probability distribution on phase space and a quantum state to a quantum state. We show that this inequality a...
متن کاملThe Analysis of Time-space Translations in Quantum Fields
I discuss the indefinite metrical structure of the time-space translations asrealized in the indefinite inner products for relativistic quantum fields, familiarin the example of quantum gauge fields. The arising indefinite unitary nondiag-onalizable representations of the translations suggest as the positive unitaritycondition for the probability interpretable positive defin...
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ژورنال
عنوان ژورنال: The European Physical Journal A
سال: 2008
ISSN: 1434-6001,1434-601X
DOI: 10.1140/epja/i2008-10603-9