Lorentz invariance vs. temperature in QFT

The Lorentz invariance of a relativistic QFT is shown to be broken spontaneously at finite temperature with a zero-energy Goldstone spectrum which does not necessarily carry a one-particle structure. The Lorentz behaviour of the temperature is determined and the relation between Gibbs states in different Lorentz frames is clarified.     

Observables and quark confinement in the covariant canonical formalism of Yang-Mills theory II

The theorem stating the absence of localized charged physical states in QED is extended to QCD in the manifestly covariant canonical formalism. The correct relation between the Gupta-Bleuler condition and the coherent photon states associated to the charged sectors is clarified in the case of QED, which secures the existence of electrons as non-localized charged physical states.     

Superalgebras of non-abelian gauge theories in the Manifestly-Covariant canonical formalism

Zeitschrift für Physik C Particles and Fields -     

Stimulated emission effects in excitonic molecule luminescence of CuCl under resonant two-photon excitation

Luminescence spectra of excitonic molecules in CuCl resonantly created by nano-second dye laser excitation are measured at 4.2 K changing the lenghts of the excited region. The spectra are dominated by stimulated emission. The gain coefficient for the M_T line is saturated more easily than that for M_L, though the former is larger under unsaturated conditions. These gain characteristics explain well various stimulated emission effects observed.     

A convenient synthesis of 1,3-dimethyl(5h,7h)imidazo(4,5-dpyrimidine-2,4,6-trithione and its unusual character

1,3-Diemthyl(5H,7H)imidazo(4,5-$\text{d}$pyrimidine-2,4,6-trithione ($\text{1}$) was synthesized by the reaction of carbon disulfide with 1,3-dimethyl-4-cyano-5-aminoimidazolidine-2-thione ($\text{3}$) which was produced by reacting trimethylsilyl cyanide with methyl isothiocyanate followed by methanolysis. An unusual reversible formation of the dimethylamine salt of $\text{1}$ is also described.     

Highly efficient synthesis of azabicyclo[x.y.0]alkane amino acids and congeners by means of Rh-catalyzed cyclohydrocarbonylation

A highly efficient method for the synthesis of 1-azabicyclo[x.y.0]alkane amino acid derivatives and their congeners by means of extremely regioselective cyclohydrocarbonylation (CHC) is described. The CHC reactions are catalyzed by Rh-BIPHEPHOS complex under mild conditions. These CHC reaction processes involve (i) an extremely linear-selective hydroformylation of the terminal alkene moiety of a dehydrodipeptide substrate, (ii) intramolecular condensation to form cyclic N-acyliminium key intermediate, and (iii) the second cyclization through intramolecular nucleophilic addition of a heteoatom nucleophile to the cyclic N-acyliminium moiety to afford the corresponding 1-azabicyclo[x.y.0] system. This consecutive double cyclization process proceeds with extremely high diastereoselectivity in most cases. This method has been successfully applied to the syntheses of 1-azabicyclo[4.4.0], -[5.4.0], and -[4.3.0] systems. The mechanisms of the reactions and the rationale for the observed extremely high diastereoselectivity are presented. This Rh-catalyzed CHC process would serve as a highly efficient and versatile method for the syntheses of a variety of conformationally restrained dipeptides, peptidomimetics, alkaloids, and other biologically active natural or unnatural products.