> Quantum particles in a spin-nematic state carry energy through waves. > “We realised that the properties of the waves in the spin-nematic state are mathemati

> Quantum particles in a spin-nematic state carry energy through waves. > “We realised that the properties of the waves in the spin-nematic state are mathematically identical to those of gravitational waves,” says Shannon. "Gravitational wave analogs in spin nematics and cold atoms" (2024) https://journals.aps.org/prb/abstract/10.1103/PhysRevB.109.L220407 https://journals.aps.org/prb/abstract/10.1103/PhysRevB.109.L... : > Abstract: Large-scale gravitational phenomena are famously difficult to observe, making parallels in condensed matter physics a valuable resource. Here we show how spin nematic phases, found in magnets and cold atoms, can provide an analog to linearized gravity. In particular, we show that the Goldstone modes of these systems are massless spin-2 bosons, in one-to-one correspondence with quantized gravitational waves in flat spacetime. We identify a spin-1 model supporting these excitations and, using simulation, outline a procedure for their observation in a 23⁢Na spinor condensate.