منابع مشابه
Black Crunch
We study the growth of fluctuations in collapsing cosmologies, extending old work of Lifschitz and Khalatnikov. As examples of systems where the fluctuations have a different composition than the background we study scalar fields with general improvement terms. Fluctuations always grow, and often dominate the homogeneous background. We argue that even for very dilute fluctuations, scattering pr...
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Royal Roads University (RRU) is a special purpose university in British Columbia, Canada. Since 1995, this university has focused primarily on multi-sectoral and interdisciplinary graduate education for working professionals. Most programs are offered in a blended online and face-to-face format, which enables adult learners to continue in their professions while they pursue their studies. While...
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of the famous one-child policy, which Deng introduced in 1979, may be beginning to backfire. Economic analysts now fear that, if the officially reported fertility rate of 1.2 children per woman is correct, the side-effects of a greying society will kick in earlier than anticipated. Reports suggest that the dependency rate, i.e. the number of children and pensioners per 100 workforce, may reach ...
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ژورنال
عنوان ژورنال: Nature
سال: 2011
ISSN: 0028-0836,1476-4687
DOI: 10.1038/nj7338-399a