Hidezumi Terazawa

Observable effects of the possible sub-structure of leptons and quarks

Abstract Some observable effects of the possible sub-structure of leptons and quarks are discussed in subquark models of leptons and quarks. They include (1) possible deviations of the anomalous magnetic moments of leptons (and quarks) from the QEWD (and QCD) predictions, (2) possible deviations of the weak charged currents of leptons (and quarks) from the V-A form and (3) possible existence of the excited states of leptons and quarks as well as those of gauge bosons and Higgs scalars.

Gravity and Electromagnetism as Collective Phenomena of Fermion-Antifermion Pairs

A generally covariant formulation is made for the previously proposed unified model of the Nambu-Jona-Lasinio type for gravity and electromagnetism. The gravitational and electro-magnetic fields are generated as collective excitations of fermion-antifermion pairs. The modl is shown to be effectively equivalent to the Einstein-Weyl theory of general relativity. The G-α relation, the relation between the fine structure constant and the Newtonian gravitational constant is re-derived.

Dynamical subquark model of pregauge and pregeometric interactions

Abstract A dynamical subquark model of leptons and quarks in which both gauge bosons and gravitons (or the space-time metric) are composites of a subquark-antisubquark pair is presented and discussed. Yang-Mills gauge theory and Einsteins general relativity appear as effective theories.

Cosmological Origin of Mass Scales

Abstract We discuss the possibility that spontaneous breakdown of conformal invariance due to the very existence of our universe originates all the mass (or length) scales ranging from the Planck mass (∼1019 GeV) to the Hubble constant (∼10−42 GeV) and suggest that the photon may have a curvature-dependent mass which is as small as 10−42 GeV. We also present a possible clue to Diracs large number hypothesis.

Super-Hypernuclei in the Quark-Shell Model. III

A super-hypernucleus is a nucleus which consists of many strange quarks as well as up and down quarks. An important part of the results of our recent investigation on the mass spectrum and other properties of super-hypernuclei in the quark-shell model is reported. It is expected that not only certain exotic nuclei such as the “dideltas” (Dδ ++++ and Dδ - ) but also certain super-hypernuclei such as the “hexalambda” (Hλ) and the “vigintiquattuoralambda” (Vqλ) may appear as quasi-stable nuclei. However, in the quark-shell model, there is no qualitative reason why the “dihyperon” or “H dibaryon” (H) should be quasi-stable or even stable. Many other predictions including a sudden increase of the K/π ratio due to the production of super-hypernuclei in heavy-ion collisions at high energies are also made.

Quark Physics in Inelastic Virtual Compton Scattering

Inelastic virtual Compton scattering of photons from nucleons for lepton-pair production, γ+ p ( n ) →γ * +anything and γ * → l + + l - , is proposed to study not only the quark structure of the nucleon but that of the photon. In a special kinematical region, the cross section for this process measures the sum of quartic charges of quarks in the nucleon while in another region, it does the quark distribution function of the photon. The magnitude of the relevant cross section is estimated to be of order 10 -34 cm 2 , which seems to be feasible for any future experiments by photon beams at energies higher than 1 GeV.

Pregeometric origin of the big bang

The temperature-dependent effective action for gravity is calculated in pregeometry. It indicates that the effective potential for the space-time metric has the minimum at the origin for extremely high temperature. The origin of the big bang can be taken as a local and spontaneous phase transition of the space-time from the pregeometric phase to the geometric one.

Subquark pregeometry with spontaneously broken conformal invariance

Abstract We present a model of subquark pregeometry in which the Higgs scalar as well as the space-time metric appears as a composite of subquark-antisubquark pairs. The effective langrangian becomes the einstein one with no cosmological term when conformal invariance is broken spontaneously.

Quark mixings in a subquark model

Abstract Quark mixings and theor momentum dependences are discussed in a subquark model in which the weak current is made of the iso-doublet spinor subquarks. The Cabibbo angle is predicted to become larger as momentum transfer between quarks grows up.

Model of the Nambu-Jona-Lasinio Type for Gravity

An effective Lagrangian for gravitational field is constructed in our model of the Nambu-Jona-Lasinio type for gravity. It is shown that in a certain coordinate condition, the equation of motion derived from this Lagrangian is reduced to the Einsteins equation of motion in the weak-field approximation.