In this paper the quantum cosmologld consequences of introducing a term cubic in the Ricci cwature scalar R into the Einstein-Hllberl action are investigated. It is argued that this (em represents a more generic perturbation to the anion than the quadratic correction usually considered. A qualitative argument suggests that there exists a region of parameter space in which neither the tunnelling nor the no-boundary boundary conditions predict an epoch of inflation that can solve the horizon and flatness problems of the standard big bang model. 'Ibis is in contrast to the Rz-theory.
In order to expand the industrial usefulness of an isothermal time-temperature-transformation (TTT) cure diagram, a method to make it applicable to a solid-state sample involving only resins and a catalyst was studied by using dynamic DSC (DDSC) and cone plate dynamic mechanical analysis (DMA). To estimate how much curing occurred for an industrially used epoxy resin molding compound manufactured in a production process was also studied, together with its position in the TTT cure diagram. The TTT cure diagram proved to be useful for determining the differences between compounds without their dissolution in a solvent, and for estimating their heat history during the production process.
A 6-dimensional grand unified theory with the compact space having the topology of a real projective plane, i.e., a 2-sphere with opposite points identified, is considered. The space is locally flat except for two conical singularities where the curvature is concentrated. One supersymmetry is preserved in the effective 4d theory. The unified gauge symmetry, for example SU(5) , is broken only by the non-trivial global topology. In contrast to the Hosotani mechanism, no adjoint Wilson-line modulus associated with this breaking appears. Since, locally, SU(5) remains a good symmetry everywhere, no UV-sensitive threshold corrections arise and SU(5)-violating local operators are forbidden. Doublettriplet splitting can be addressed in the context of a 6d N = 2 super Yang-Mills theory with gauge group SU(6). If this symmetry is first broken to SU(5) at a fixed point and then further reduced to the standard model group in the above non-local way, the two light Higgs doublets of the MSSM are predicted by the group-theoretical and geometrical structure of the model.
Dynamic mechanical properties of melt grown Polyoxymethylene are studied for specimens with different lamella thicknesses and for irradiated specimens over a range of temperature from -30°C to 150°C. The apparent relaxation strength of the mechanical α-dispersion is proportional to the lamella thickness. This result qualitatively satisfies the requirements of Okano's theory of crystalline dispersion. The apparent relaxation strength of the α-dispersion for irradiated specimens increases with increasing irradiation dose. This behavior is not due to the growth of lamella thickness with irradiation, but due to other effects, such as the occurrence of lattice defects in crystallites by irradiation. Thus it is impossible to explain this behavior in terms of Okano's theory. The apparent activation energy of the α-dispersion does not change with γ-irradiation, which indication, which indicates that the irradiation does not essentially influence the molecular mechanism of the dispersion.
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