Asim Yildiz

On the electric dipole moment of the neutron

Abstract A nonvanishing contribution to the neutron electric dipole moment, from the interaction of the photon with two-quark subsystems, is calculated. In the Kobayashi—Maskawa model the resulting value of the moment is estimated as O(10−32 e cm; however, strong interaction corrections (gluonic radiative corrections) could give a quark moment contribution which may be numerically larger (possibly 10−30±1e cm).

CP violation in gauge theories and the electric dipole moment of the neutron

Abstract A nonvanishing contribution to the neutron electric dipole moment in CP-violating gauge theories of the weak interactions, arising from interaction of the photon with two-quark subsystems of the three-bound-quark neutron system, is calculated. In the Kobayashi-Maskawa model the resulting value of the moment is estimated as O (10 −32 ) e cm; however, strong interaction corrections (gluonic radiative corrections) give quark moment contributions which may be numerically larger (possibly 10 −30±1 e cm). Either case clearly distinguishes gauge-sector CP violation from Higgs-sector CP violation which typically gives a neutron moment of order 10 −24 e cm.

Finite Temperature Corrections to Field Theory: Electron Mass and Magnetic Moment, and Vacuum Energy

Abstract A finite temperature formalism which maintains Lorentz covariance is rederived and compared to other approaches. It is used to obtain the order-α temperature shifts in the electron mass and magnetic moment, vacuum energy. The mass and magnetic moment shifts, for kT ⪡ m, are of order α( kT m ) 2 and hence beyond the present experimental observation limits. An explicit form for the general temperature mass shift is obtained.

Extended unified field theories: An SU(7) model

Abstract Seeking a theory which unifies strong and electroweak interactions, we propose an SU(7) model which provides an explanation to the flavor question while avoiding the introduction of a t quark. This model is found to be consistent with low energy phenomenology, including the reported decays B → J/Ψ Kπ, and to contain intermediate mass scales such that new physical processes may occur at levels subject to experimental verification.

Neutral SU(2) and neutral currents

Abstract We examine the neutral current structure of a class of topless gauge theories in which b decay and CP violation are mediated by neutral gauge bosons, N. We find a good fit to all data(better than the fit to the standard model) for sin 2 θ = 0.205 and M N 2 /M W 2 ~ 10.

Spectral forms and renormalization group equations of the Schwinger model

By using source methodologies in the Schwinger model, the spectral form for the photon Greens function and the renormalization group formalism are introduced to investigate the non-trivial eigenvalue of the effective coupling constant and its implications for dynamical mass generation.

Vacuum condensation and vacuum stability in 1 + 1 dimensional QCD

Abstract Vacuum condensation and vacuum stability are investigated in the non-Abelian Schwinger model.

Hypercolor unification without cosmological domains

Grand unified models are considered in relation to the cosmological constraint of vanishing domain walls, to solving the strong-CP problem and hypercolor unification. A semisimple theory of (SU(9))/sup 3/ is found to be the best example.

Avoiding domain walls in SU(5) × SU(5)

Abstract We consider the problem of cosmological domain walls in the context of an SU(5) × SU(5) unified model. This model automatically solves the strong CP problem with an invisible axion, but avoids the domain wall problem found by Sikivie for models of this type.

A Modest Appeal to SU(7)

A particular version of SU(7) symmetry without top (t) quark provides an explanation for low energy phenomenology and remains consistent with cosmological baryon generation, proton decay, neutrino mass generation and similar exotic processes by including intermediate mass scales.