Symbol boldsymbolσ

The passage around this formula

…into a black hole, with the tilt itself playing the role of the metric’s off-diagonal, “flow” components. The paper writes the whole statement as a single Hamiltonian, fixing the Fermi velocity $v_F$ , the Pauli matrices $\boldsymbol{\sigma}$ acting on the electron’s internal degree of freedom, the momentum-space shift $\mathbf{b}$ , and the tilt vector W(x) : $H = v_F\,\boldsymbol{\sigma}\cdot(\mathbf{k}-\mathbf{b}) + v_F\,W(x)\,\mathbf{k}\cdot\mathbb{1}$. The first term is ordinary tilted-free Weyl physics, shifted by the strain-induced gauge field. The second term is the one that matters…

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