منابع مشابه
The Big Bang Theory
The first theoretical evidence for the Big Bang came from Alexander Friedmann in 1922, when he showed that Albert Einstein’s theory of general relativity predicted that the universe was either expanding or contracting. Einstein was so upset with this result that he introduced a cosmological constant into his theory which would make the universe static. Later he said that this was his biggest bl...
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The big bang-big crunch (BB-BC) algorithm is a popular metaheuristic optimization technique proposed based on one of the theories for the evolution of the universe. The algorithm utilizes a two-phase search mechanism: big-bang phase and big-crunch phase. In the big-bang phase the concept of energy dissipation is considered to produce disorder and randomness in the candidate population while in ...
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We consider a picture in which the transition from a big crunch to a big bang corresponds to the collision of two empty orbifold planes approaching each other at a constant non-relativistic speed in a locally flat background space-time, a situation relevant to recently proposed cosmological models. We show that p-brane states which wind around the extra dimension propagate smoothly and unambigu...
متن کاملThe "big bang" theory and Down syndrome.
I am convinced that some of the most joyful, life-changing conventions in our field are those that focus on families with children having Down syndrome. Whole families come. Some appear with babes in arms. Clinicians named Pueschel, Crocker, Kumin, Falvey, Rosenberg and many others hold impromptu clinics in halls, lobbies, and special session rooms. It all goes so well because these parents hun...
متن کاملBig Bang Models in String Theory
These proceedings are based on lectures delivered at the “RTN Winter School on Strings, Supergravity and Gauge Theories”, CERN, January 16 January 20, 2006. The school was mainly aimed at Ph.D. students and young postdocs. The lectures start with a brief introduction to spacetime singularities and the string theory resolution of certain static singularities. Then they discuss attempts to resolv...
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ژورنال
عنوان ژورنال: SSRN Electronic Journal
سال: 2009
ISSN: 1556-5068
DOI: 10.2139/ssrn.1338614