Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
AMA | October 2024
Sean Carroll
That doesn't mean that there's zero energy density in the universe. It just means that the energy density that we have comes in the form of particles whose wavelengths are much larger than the size scale of the extra dimensions. So basically a photon that you see in your room carries energy, but its wavelength is much, much larger than the size of the extra dimensions.
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