A scale-invariant spectrum of isocurvature perturbations is generated during collapse in the scaling solution in models where two or more fields have steep negative exponential potentials. The scale invariance of the spectrum is realized by a tachyonic instability in the isocurvature field. We show that this instability is due to the fact that the scaling solution is a saddle point in the phase space. The late-time attractor is identified with a single-fielddominated ekpyrotic collapse in which a steep blue spectrum for isocurvature perturbations is found. Although quantum fluctuations do not necessarily to disrupt the classical solution, an additional preceding stage is required to establish classical homogeneity.
The alm of the report is to reveal the regularities of the structure states formation in irradiated crystals with ion-covalent bonds/ formulate the conditions of radiation-induced changes in crystal structure and present ideas about factors which affect the structure stability under irradiation. "To solve this problem we used both the known data and our experimental results~. on
Single crystals of NazSD.III are grown by metastable nucleation from aqueous solutions at 50°C. This phase is orthorhombic with space group Cmcm and cell constants a = 5.607A 0 , b = 8.96AO, c = 6.967A 0 , Z = 4. The structure is refined to R = 4.5%. The structure consists of tetrahedral and octahedral framev10rk. The thermal vibrations of most of the atoms are large along c-axis (Zeit. Krist.-in Press). Single crystals of this phase III (fig. 3a: Weissenberg Photograph 0-layer) on heating upto phase I and cooling, show oriented domains of phase III and phase II in the same crystals (fig. 3b: Weissenberg photograph 0-layer).
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