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Inflation is a prequel to the conventional Big Bang theory. ...It does provide a theory of the propulsion that drove the universe into this humungous episode of expansion which we call the Big Bang.

— Alan Guth The Early Universe (2012)

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More quotes by Alan Guth

The Big Bang theory says nothing about what banged, why it banged, or what happened before it banged.

It becomes very tempting to ask whether, in principle, it's possible to create a universe in the laboratory—or a universe in your backyard—by man-made processes.

The recent developments in cosmology strongly suggest that the universe may be the ultimate free lunch.

It is said that there’s no such thing as a free lunch. But the universe is the ultimate free lunch.

In short what I like to say is that the Big Bang says nothing about what banged, why it banged, or what happened before it banged. It really has no bang in the Big Bang. It is a bangless theory, despite its name.

The Early Universe (2012)

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Quote text and notes from Wikiquote: Alan Guth (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.