No abstract

X‐ray diffraction in a perfect crystal with distorted surface layer is considered on the basis of the recurrence relations for amplitude reflection and transmission coefficients of X‐rays in a multilayer crystal. It is shown that such parameters of a distorted layer as its thickness and change in the interplanar spacing can be determined directly from diffraction curves of different orders.

It is shown that introducing quantum effects using de Broglie-Bohm theory in the canonical formulation of gravity changes the constraint algebra. The new algebra is a clear projection of general coordinate transformations to the spatial and temporal diffeomorphisms. The quantum Einstein equations are manifestly covariant under the above diffeomorphisms.

No abstract

No abstract