How do black holes destroy information and why is that a problem?

Re:How do black holes destroy information and why is that a ... by dls2016 on Monday August 26, 2019 @10:27AM (#20800113)

That quote is not exactly correct, there are plenty of evolution equations which are not time-reversible beginning with the linear heat equation. If you look at the solution given by convolution (usually taught in first PDE course) you see that this equation has infinite speed of propagation. Any parabolic/dissipative equation is not time-reversible (which is analogous to addition not being reversible... dissipation involves an averaging process).

Elsewhere the author says "all fundamental evolution equations in physics are time-reversible." By fundamental I'm assuming she means: Maxwell's equations, Einstein's field equations and the Schrodinger equation.

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Re:How do black holes destroy information and why is that a ... by marcosdumay on Monday August 26, 2019 @01:49PM (#20802034)

I don't think they mean Maxwell's ones, since they can be derived from the Schrodinger equation with a well chosen Hamiltonian.

But then, the observation principle is as fundamental as Schrodinger's equation and irreversible. It's just not an equation.

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