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31 | Brian Greene on the Multiverse, Inflation, and the String Theory Landscape

Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas

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The Energy of Empty Space

In string theory, where there are extra dimensions, you can pacify them. But even before we knew about that, there was this thing called the cosmological constant problem. The energy of empty space is a phenomenological tool for making our equations agree with what we observe. We've had a hard time finding a way within sufficiently small number to allow us to calculate the energy of space and find out how it's changing over time.

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