By Abhay Ashtekar

Chosen issues on quantum gravity are handled emphasizing extra geometrical me- equipment and conceptual concerns than sensible research, perturbative expansions and computation of numbers, The lirst half bargains with Asymptotic Quantization sheding gentle at the beginning of the Bondi-Meizner-Sachs workforce within the gravitational radiation concept. the second one half is dedicated to canonical quantization, which gives the de- particular quantum dynamics and enhances the in basic terms kinematic;)] asympotic descrip- description preset"!Led within the lirsf half.

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Physics (USSR) 3 0, 1058 (1956); ibid. 32, 59 (1957). 24. A. Haug, Theoretical Solid-State Physics, Vol. 1 (Pergamon, Oxford, 1972); C. Kittel, Introduction to Solid-State Physics, 6th ed. (Wiley, New York, 1986); N. W. Ashcroft and N. D. Mermin, Solid-State Physics (Saunders, Philadelphia, 1976); W. Harrison, Solid-State Theory (Dover, New York, 1980). 25. A. C. Rose-Innes and E. H. Rhoderick, Introduction to Superconductivity, 2d ed. (Pergamon, Oxford, UK, 1978). 26. C. J. Gorter and H. B. G.

7) This equation is very useful in the qualitative discussion of the electrical transport phenomenon. The inverse mass-dependence law means that the ion contribution to the FREE-ELECTRON MODEL FOR A METAL 39 electric transport in an ionized gas will be smaller by at least three orders of magnitude than the electron contribution. Also note that the conductivity is higher if the number density is greater and/or if the mean free time is greater. 8) is called the rate of collision or the collision rate.

B. G. Casimir, Physica 1 , 306 (1934). 27. J. Bardeen, L. N. Cooper, and J. R. Schrieffer, Phys. Rev. 108 , 1175 (1957). 28. H. Fröhlich, Phys. Rev. 79, 845 (1950). 29. L. N. Cooper, Phys. Rev. 104, 1189 (1956). 30. D. J Douglas Jr. and R. W. Schmitt, Rev. Mod. Phys. 36 , l–331 (1964); R. D. , Superconductivity (Marcel Dekker, New York, 1969). 31. S. Fujita, J. Supercond. 4, 297 (1991); J. Supercond. 5, 83 (1992); S. Fujita and S. Watanabe, J. Supercond. 5, 219 (1992); J. Supercond. 6, 75 (1993).