The universe would have expanded in a smooth way from a single point. As it expanded, it would have borrowed energy from the gravitational field, to create matter. As any economist could have predicted, the result of all that borrowing, was inflation. The universe expanded and borrowed at an ever-increasing rate. Fortunately, the debt of gravitational energy will not have to be repaid until the end of the universe.
About this quote
- What does it mean?
- Hawking uses an economic metaphor to explain cosmic inflation and energy borrowing in the early universe.
- In plain terms
- The universe grew fast by borrowing energy, like a debt paid at the end.
- What can you take from it?
- Cosmic inflation can be understood through economic analogies.
Where it applies
Putting it to work
Questions to consider
- Why use economics to explain physics?
- How do metaphors shape scientific understanding?
Another view
The debt analogy might mislead people about physical energy conservation.
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