For people on a mobile device: > TLDR: > the holographic principle allows physicists to study gravitational systems by projecting them on a boundary > proved

For people on a mobile device: > TLDR: > the holographic principle allows physicists to study gravitational systems by projecting them on a boundary > proved that symmetry is not possible in a gravitational theory if it obeys the holographic principle. > meaning that symmetry would not be possible in quantum gravity.