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a bounded dynamic solution is:
g(((nx, ny, nz, r, t') = ((( +(((k)(nx, ny, nz, t')/rk, where n( = x(/r. (4)
3) The non-existence of dynamic solutions: It follows expansion (4) that the non-zero time average of G(1)(t would be of O(1/r3) due to
((n( = (((( + n( n()/r, (5)
since the term of O(1/r2), being a sum of derivatives with respect to t', can have a zero time-average. If G(2)(t is of O(K2/r2) and has a nonzero time-average, consistency can be achieved only if another term of time-average O(K2/r2) at vacuum be added to the source of (1). Note that there is no plane-wave solution for (1') [9,18]. It will be shown by contradiction that there is no dynamic solution for (1) with a massive source. Let us define
((( = ((1)(( + ((2)(( ; (i)(( = ((i)(( - ((( (((i)cd (cd), where i = 1, 2 ; and (((((1)(( = - K T(m)(( . (6)
Then (1)(( is of a first-order; and ((2)(( is finite. On the other hand, from (1), one has
(((((2)(( + H(1)(( + G(2)(( = 0 . (7)
Note that, for a dynamic case, equation (7)& 上一页 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] ... 下一页 >> |