Properties of Noncomposite Particles

Systematics of heavy quarkonia from Regge trajectories on(n,M2)and(M2,J<

“…The possible reason of such deviation is that the massless quark approximations fails in this case. In the series of works (for example [1,2,27,28]) the results obtained in the framework of the string model with massive quarks are presented and these results are in qualitative agreement with the experimental picture. The same result can be obtained in the framework of the potential models.…”

“…In the series of works [1,2] the attempts were made to describe the relativistic string with fermions at the ends. In the limit of massless quarks the relativistic string model leads to linear Regge trajectories J = α ′ M 2 + α(0).…”

Spacetime diamonds

“…The same thermal particle-number distribution was obtained by Ida et al [12] through a different way. However, they use it as an intermediate result to derive the time-dependent temperature as proposed by Martinetti and Rovelli instead of interpreting it as the diamond temperature.…”

“…Therefore, if the dynamics of the scalar field is conformally invariant and also the vacuum state, then a mode inside the diamond should be perfectly entangled with a corresponding mode outside the diamond. A pair of entangled modes inside and outside the diamond has been calculated in the (1 þ 1)-dimensional spacetime [12]. Here, we are interested in the timelike entanglement between diamonds along the t-axis, which is now not bipartite entanglement but multipartite entanglement.…”

“…Another orthonormal and complete set of modes was introduced in Ref. [12], the modes inside the zeroth diamond, g ð0Þ ω ðVÞ, and that outside,…”