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I was watching a lecture by Alan Guth and wished I was in the classroom to be able to ask a question. He explained that the total energy in the universe could be very close to zero since mass and radiation is offset by the negative energy of the gravitational field. I wonder why mass isn't still "popping" into existence as long as a gravitational field also comes to be simultaneously.

Qmechanic
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Jack R. Woods
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The idea of a "Zero-Energy Universe" is a theory held by a limited number of scientists.

There are several stackexchange question that expand on the theory and may help you.

Zero energy universe

Total energy of the Universe

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