"What it takes to produce a gravitational repulsion is a negative pressure. According to general relativity, it turns out... both pressures and energy densities can produce gravitational fields, unlike Newtonian physics, where it's only mass densities that produce gravitational fields."
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Academics from the United StatesJews from the United StatesCosmologistsPhysicists from the United StatesAstronomers from the United States
Original Language: English
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Lecture 1: Inflationary Cosmology: Is Our Universe Part of a Multiverse? Part I.
https://en.wikiquote.org/wiki/Alan_Guth
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Alan Guth
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