Once Before Time

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A Whole Story of the Universe

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Once Before Time

A Whole Story of the Universe

In 2000, Martin Bojowald, then a twenty-seven-year-old post-doc at Pennsylvania State University, used a relatively new theory called loop quantum gravityâ€”a cunning combination of Einsteinâ€™s theory of gravity with quantum mechanicsâ€”to create a simple model of the universe. Loop quantum cosmology was born, and with it, a theory that managed to do something even Einsteinâ€™s general theory of relativity had failed to doâ€”illuminate the very birth of the universe.

Ever since, loop quantum cosmology, or LQC, has been tantalizing physicists with the idea that our universe could conceivably have emerged from the collapse of a previous one. Now the theory is poised to formulate hypotheses we can actually test. If they are verified, the big bang will give way to the big bounce. Instead of a universe that emerged from a point of infinite density, we will have one that recycles, possibly through an eternal series of expansions and contractions, with no beginning and no end.

Bojowaldâ€™s major realization was that unlike general relativity, the physics of LQC do not break down at the big bang. The greatest mystery surrounding the origin of the universe is what cosmologists call the big bang â€œsingularityâ€â€”the point at the beginning of the universe, prior to the existence of space and time, when gravity, along with the temperature and density of the universe, becomes infinite. The equations of general relativity canâ€™t cope with such infinities, and as a result big bang theory has never been able to give any explanation for the initial condition of our universe, succeeding only in describing and explaining the evolution of the universe from that instant onward. Bojowaldâ€™s theory takes us right up to the first moment of the universeâ€”and then back, even before the big bang itself.

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محتوای مستهجن
توهین به قومیتها و محتوای نژادپرستی
توهین به اقیلیتهای مذهبی
اهانت به مقامات سیاسی و مذهبی
اشاعه ی کودک آزاری
سایر موارد

بستن

فرمت کتاب

ebook

زبان

english

تاریخ انتشار

2010

نویسنده

Martin Bojowald

ناشر

Alfred A. Knopf

شابک

9780307272850

20,000 تومان

خرید کتاب مطالعه نمونه درخواست ترجمه کتاب

خرید کتاب Once Before Time

Once Before Time

گزارش تخلف

فرمت کتاب

ebook

زبان

english

تاریخ انتشار

2010

نویسنده

ناشر

شابک

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