Summary
We discuss a Poincaré-invariant Hamiltonian dynamics which allows a single physical «common time» for classical manyparticle systems. We consider in detail two particles interacting via a common potentialV 1=V 2=V(r 2), 2r λ=x λ1 −x λ2 and satisfying the constraintsK a≡p 2a +Va=0,a=1,2. The equations of motion automatically lead to the results i) (p λ1 +p λ2 )r λ=0 provided dV(r 2)/dr 2≠0 and ii)K 1 andK 2 satisfy the first-class condition {K 1,K 2}=0. In such a formalism, the objective reality of world-lines for point particles is retained and is compatible with the existence of interaction in the four-dimensional Hamiltonian dynamics.
Riassunto
Si discute la dinamica hamiltoniana invariante secondo Poincaré che permette un singolo «tempo comune» fisico per sistemi classici a molte particelle. Si considerano in dettaglio due particelle interagenti attraverso un potenziale communeV 1=V 2=V(r 2), 2r λ=x λ1 −x λ2 e che soddisfa i vincoliK a≡p 2a +Va=0,a=1,2. Le equazioni di moto portano automaticamente ai risultati i) (p λ1 +p λ2 )r λ=0 se dV(r 2)/d 2≠0 e ii)K 1 eK 2 soddisfano la condizione di prima classe {K 1,K 2}=0. In tale formalismo, si fa propria la realtà obbiettiva di linee di universo per particelle puntiformi, compatibile con l'esistenza d'interazione nella dinamica hamiltoniana quadridimensionale.
Резюме
Мы обсуждаем Пуанкаре-инвариантную гамильтонову динамику, которая допускает единственное физическое «общее время» для классических многочастичных систем. Мы подробно рассматриваем две частицы, вааимодействующие через обший потенциалV 1=V 2=V(r 2), 2r λ=x λ1 −x λ2 и удовлетворяюшие ограничениямK a≡p 2a -m 2a +Va=0,a=1,2. Уравнения движения автоматически приводят к результатам: 1) (p λ1 +p λ2 )·r λ=0, при условии, что dV(r2)/dr 2≠2 и 2)K 1 иK 2 удовлетворяют условию первого класса {K 1,K 2}=0. В таком фармализме для точечных частиц обьективная реальность мировых линий сохраняется и является совместимой с существованием взаимодействия в четырехмерной гамильтоновой динамике.
Similar content being viewed by others
References
P. A. M. Dirac:Rev. Mod. Phys.,21, 392 (1949);Can. J. Math.,2, 129 (1950).
E. C. G. Sudarshan, N. Mukunda andJ. N. Goldberg:Phys. Rev. D.,23, 2218 (1981), and references therein.
D. Dominici, J. Gomis andG. Longhi:Nuovo Cimento B,48, 152 (1978);Nuovo Cimento A,48, 257 (1978)56, 263 (1980).
J. P. Hsu:Nuovo Cimento B,61, 249 (1981);Phys. Rev. D,24, 802 (1981). In these two papers, it has been demonstrated that one single scalar evolution variable (common time) for the many-particle system can be physically realized by setting up clock systems and can be applied to two-particle bound states for deriving the confinement potential ∞r exp [-br] of quarks by solving Nambu's equation.
J. P. Hsu andT. Y. Shi:Phys. Rev. D.,26, 2745 (1982).
See, for example,R. Hakim:J. Math. Phys. (N. Y.) 8, 1315 (1967).
F. J. Dyson:Phys. Rev.,91, 1543 (1953);Ruan Tu-Nan, Zhu Hsi-Quen, Ho Tso-xiu, Qing Cheng-rui andChao-qin:Proceedings of the 1980 Guangzhou Conference on Theoretical Particle Physics (Beijing, 1980), Vol.2, p. 1390.
FollowingDirac ref., we use the general rules governing algebraic relations with strong and weak equations (with the signs≡ and=, respectively): if A≡ 0, then δA=0; ifB=0, then σB≠0.
Y. S. Kim andM. E. Noz:Phys. Rev. D,8, 3521 (1973); for a discussion of models with the constraintP·r=0, see alsoT. Takabayashi:Prog. Theor. Phys.,54, 2127 (1977).T. Takabayashi andS. Kojima:Prog. Theor. Phys.,57, 2127 (1977).
Author information
Authors and Affiliations
Additional information
The work is supported in part by the SMU Research Committee.
Traduzione a cura della Redazione.
Переведено редакцией.
Rights and permissions
About this article
Cite this article
Hsu, J.P. Poincaré-invariant Hamiltonian dynamics with a physical «common time». Nuovo Cimento B 75, 185–194 (1983). https://doi.org/10.1007/BF02831172
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02831172