A theory of how small particles are formed and act based on the quantum principle (by which energy is emitted in certain packets, or quanta) and the uncertainty principle.
Quantum mechanics Quotes in A Brief History of Time
The A Brief History of Time quotes below are all either spoken by Quantum mechanics or refer to Quantum mechanics. For each quote, you can also see the other terms and themes related to it (each theme is indicated by its own dot and icon, like this one: Note: all page numbers and citation info for the quotes below refer to the Bantam edition of A Brief History of Time published in 1988.).
Chapter 8 Quotes
We don’t yet have a complete and consistent theory that combines quantum mechanics and gravity. However, we are fairly certain of some features that such a unified theory should have.
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Quantum mechanics Term Timeline in A Brief History of Time
The timeline below shows where the term Quantum mechanics appears in A Brief History of Time. The colored dots and icons indicate which themes are associated with that appearance.
Scientists now describe the universe in terms of the general theory of relativity and quantum mechanics —both great achievements of the first half of the 20th century. The first relates to... (full context)
...the ultimate theory becomes hard to justify. Then again, people argued this about relativity and quantum mechanics , which eventually gave us nuclear power and microelectronics. Thus, the search for a theory... (full context)
...curved, like the surface of the earth. When combining the general theory of relativity with quantum mechanics (as discussed later), space and time can be finite without a boundary. But this doesn't... (full context)
...down at the beginning of the universe. When the universe was squeezed into infinite density, quantum mechanics comes into play. As such, their focus turned from the massive to the miniscule. (full context)
Heisenberg, Erwin Schrodinger, and Paul Dirac in the 1920s created quantum mechanics based on the uncertainty principle. This theory does not predict definite outcomes, but potential outcomes.... (full context)
...electrons could only orbit at specific distances, which would balance it all out. According to quantum mechanics , the electrons would move as waves, and therefore would only form orbits where the... (full context)
Einstein’s general theory of relativity is considered a classical theory because it does not include quantum mechanics . This does not lead to inconsistency, though, as gravitational forces are so weak compared... (full context)
...the first to propose a theory consistent with both the general theory of relativity and quantum mechanics . He showed mathematically how spin ½ works and predicted that electrons should have partners,... (full context)
...people up the wrong way, and was the first significant example of general relativity and quantum theory combining. John G. Taylor opposed Hawking when he announced these discoveries. But in the end,... (full context)
...emissions. But is seems when a black hole becomes really small, it will simply disappear. Quantum theory seemed to undermine the idea of singularities, and Hawking’s work turned in that direction in... (full context)
...collapses back in on itself, or in localized singularities in black holes. But when applying quantum mechanics , it is clear that black holes re-emit mass and energy into the universe, eventually... (full context)
...would also account for why there is so much matter in the universe. According to quantum theory , particles can be created by energy, which raises the question of where the energy... (full context)
...about nuclear science at the time, but also because of his own refusal to accept quantum theory despite his own input into its creation. The uncertainty principle, on which quantum theory is... (full context)
Today, Laplace’s approach is defunct because of the uncertainty principle of quantum mechanics , which introduces a minimum level of randomness. Quantum theory gives particles less well-defined positions... (full context)