As far as mind-melting ideas go, the ‚hologram principle‚ is right up there. It predicts that, mathematically, the Universe requires just two dimensions, and only looks three dimensional to us because it acts like a giant hologram. It sounds pretty crazy, but over the past two decades, the principle has steadily been gathering steam, and now new results suggest that this principle holds true for flat spaces like our Universe, and could soon be tested.
By Fiona Macdonald|Science alert
This would mean that everything we see in our comfortable, three-dimensional world is just the image of two-dimensional processes, overlaid onto a huge cosmic horizon.
But let’s back things up a little bit, because while this all sounds a little too whacky, the science actually holds up. The holographic principle was first proposed by physicist Leonard Susskind in the 1990s, and Jamie Lendino over at Extreme Tech does a great job of explaining the basic idea:
„It asserts that a volume of space can be thought of as encoded on a boundary to it – such as an observer-dependent gravitational horizon – and therefore needs one less dimension then it appears to need.“
For this to be true, you would need to be able to map the results of gravitational phenomena – usually described with three spatial dimensions – onto the results of the behaviour of quantum particles – described with only two spatial dimensions.