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Pressures
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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.
Alan Guth
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A positive pressure produces an attractive gravitational field... Positive pressures are just sort of normal pressures and attractive gravity is normal gravity, so normal pressures produce normal gravity, but it is possible to have negative pressures, and negative pressures produce repulsive gravity, and that's the secret of what makes inflation possible.
Alan Guth
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Every hand and every hour should be devoted to rescue the world from its insanity of guilt, and to assuage the pangs of human hearts with balm and anodyne. To pity distress is but human; to relieve it is Godlike.
Horace Mann
Alan Guth
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Born:
February 27, 1947
(age 77)
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