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Another example of a tachyonic field is the tachyon of bosonic string theory. [ 29 ] [ 32 ] Tachyons are predicted by bosonic string theory and also the Neveu-Schwarz (NS) and NS-NS sectors , which are respectively the open bosonic sector and closed bosonic sector, of RNS superstring theory prior to the GSO projection .
Julia M. Klein of Johns Hopkins Magazine wrote, "There's nothing small about Johns Hopkins physicist Sean Carroll's latest undertaking. The Biggest Ideas in the Universe: Space, Time, and Motion is the first volume in an ambitious trilogy that seeks to explain physics to a popular audience—one willing to grapple with the basics of calculus and other mathematical underpinnings of the field.
As Farnes' theory allows a positive mass (i.e. a ship) to reach a speed equal to the speed of light, it has been dubbed "controversial". [18] If the theory is correct, which has been highly debated in the scientific literature, it would explain dark energy, dark matter, allow closed timelike curves (see time travel ), and suggest that an ...
In theory, a large number of stages could push a vehicle arbitrarily close to the speed of light. [47] These would "burn" such light element fuels as deuterium, tritium, 3 He, 11 B, and 7 Li. Because fusion yields about 0.3–0.9% of the mass of the nuclear fuel as released energy, it is energetically more favorable than fission, which releases ...
Beyond Einstein: The Cosmic Quest for the Theory of the Universe is a book by Michio Kaku, a theoretical physicist from the City College of New York, and Jennifer Trainer Thompson. [1] It focuses on the development of superstring theory, which might become the unified field theory of the strong force, the weak force, electromagnetism and gravity.
The Universe in a Nutshell is a 2001 book about theoretical physics by Stephen Hawking. [ 1 ] [ 2 ] It is generally considered a sequel and was created to update the public concerning developments since the multi-million-copy bestseller A Brief History of Time was published in 1988.
Astrophysics for People in a Hurry is a 2017 popular science book by Neil deGrasse Tyson, centering around a number of basic questions about the universe.Published on May 2, 2017, by W. W. Norton & Company, the book is a collection of Tyson's essays that appeared in Natural History magazine at various times from 1997 to 2007.
Thus, an accelerating universe took a longer time to expand from 2/3 to 1 times its present size, compared to a non-accelerating universe with constant ˙ and the same present-day value of the Hubble constant. This results in a larger light-travel time, larger distance and fainter supernovae, which corresponds to the actual observations.
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