A new study found a simple and powerful way to control particles and form crystals: illuminating them. The research provides a simple and reversible method for forming crystals that can be used to develop a new generation of adaptable materials.

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“I just said: ‘This isn’t going to work, guys, your mom is not going to be part of this discussion, so we’re going to have to shut her down, or you’re not going to be considered for this role,’” O’Leary recalled.

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For the Poincaré half-space model in dimension 2, the metric evaluates on the coordinate tangent vectors \(\frac{\partial}{\partial x}, \frac{\partial}{\partial y} \in T_pM\) as \[g_p\!\left(\frac{\partial}{\partial x^i}\bigg|_p,\;\frac{\partial}{\partial x^j}\bigg|_p\right) = \frac{1}{y^2}\,\delta_{ij},\] i.e. the coordinate tangent vectors are orthogonal and each has length \(\frac{1}{y}\) — shrinking to zero as \(p\) approaches the boundary \(y\to 0\), which is what makes the space “infinitely large” near the boundary.

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