Equation 2 · Every Crystal Has Its Own Speed of Light
What does this equation mean?
Read the formula alongside the article passage below. Each part has a deeper page with its role in the equation, the supporting passage and nearby citations.
This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text. Read the equation part by part below; each part has a contextual explanation and a link to its mathematical background.
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Symbol B_y
is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
subscript
The lower label selects a particular version, component, or indexed member of the quantity. For example, x₀ and xₜ can be values at different positions.
How to interpret it
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What the article says around this equation
Stated formally, the bound says that for two operators and acting on well-separated lattice sites x and y , the size of their commutator after evolving one of them forward in time t is capped by an exponential in the distance between the sites minus the cone’s own reach:
Sources cited in the article section
- [1] The Finite Group Velocity of Quantum Spin Systems ↗
- [3] Observation of Entanglement Propagation in a Quantum Many-Body System ↗
These citations give research context. Read each source to check which claims it supports.