*A Brief History of Time*).

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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*A Brief History of Time*LitChart as a printable PDF.## 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.Chapter 1

**quantum mechanics**—both great achievements of the first half of the 20th century. The first relates to...

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**quantum mechanics**, which eventually gave us nuclear power and microelectronics. Thus, the search for a theory...

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Chapter 3

**quantum mechanics**(as discussed later), space and time can be finite without a boundary. But this doesn't...

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**quantum mechanics**into account.

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**quantum mechanics**comes into play. As such, their focus turned from the massive to the miniscule.

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Chapter 4

**quantum mechanics**based on the uncertainty principle. This theory does not predict definite outcomes, but potential outcomes....

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**quantum mechanics**, the electrons would move as waves, and therefore would only form orbits where the...

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**quantum mechanics**. This does not lead to inconsistency, though, as gravitational forces are so weak compared...

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Chapter 5

**quantum mechanics**. He showed mathematically how spin ½ works and predicted that electrons should have partners,...

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**quantum mechanics**must follow the symmetry of CPT. J. W. Cronin and Val Fitch proved the universe...

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**quantum mechanics**together.

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Chapter 6

**quantum mechanics**, scientists know it is both. Gravity will affect light the same way it does...

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Chapter 7

**quantum theory**combining. John G. Taylor opposed Hawking when he announced these discoveries. But in the end,...

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**Quantum theory**seemed to undermine the idea of singularities, and Hawking’s work turned in that direction in...

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Chapter 8

**quantum mechanics**, it is clear that black holes re-emit mass and energy into the universe, eventually...

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**quantum theory**, particles can be created by energy, which raises the question of where the energy...

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**quantum theory**of gravity.

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**quantum theory**and gravity. If there were, it should involve Feynmann’s sum over histories proposal, which states...

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**quantum mechanics**and general relativity is that gravity is represented in a curved space-time. Applying the sum...

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**quantum theory**scale. Singularities will only appear as such in real time, but one could equally say...

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Chapter 9

**quantum mechanics**, one must apply imaginary time. Imaginary time is no different from the dimensions of...

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**quantum theory**of gravity to know how it all began, rather than guess.

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Chapter 10

**Quantum theory**allows a negative energy balance in certain areas as long as the universe’s overall balance...

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Chapter 11

**quantum theory**despite his own input into its creation. The uncertainty principle, on which

**quantum theory**is...

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**quantum mechanics**.

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Chapter 12

**quantum mechanics**, which introduces a minimum level of randomness.

**Quantum theory**gives particles less well-defined positions...

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**quantum mechanics**, however, leads to ideas of a finite, four-dimensional space with no boundaries. This could...

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