time-reversed

He emphasises the contingency of the latter fact because he regards backwards or time-reversed causation as a conceptual possibility that cannot be ruled out a priori.

My Shasta Daisy 2009

One form that such a naked singularity could take is that of a white hole, which is a time-reversed black hole.

Singularities and Black Holes Curiel, Erik 2009

It would be interesting to flesh out this timeline with some narrative describing biological and cultural evolution, and the lives of individuals, where history and memory play crucial roles, if only to emphasize how much time-reversed scenarios conflict with our understanding of our existence.

The Arrow of Time in Scientific American Sean 2008

My point in #18 though, is that this would not be the case in a time-reversed universe.

Incompatible Arrows, III: Lewis Carroll Sean 2008

It might also be interesting to consider the hypothetical case of a perfectly time-symmetric black/white hole with a finite lifetime, which initially forms from a collapsing shell of matter (or converging time-reversed Hawking radiation), lasts for some time, then blows apart in a time-reversed version of its formation.

Arrow of Time FAQ Sean 2007

Obviously it must be possible to have such a completely time-reversed black hole just by T-symmetry, but I wonder if there are clear arguments in “white hole thermodynamics” that would rule out a different kind of white hole that was increasing the entropy of the region it was sitting in rather than decreasing it.

Arrow of Time FAQ Sean 2007

So, this also helps me see what you meant at the end of #132 when you said “if you let yourself fall freely towards the white hole produced by the reversal, you never cross the horizon; rather, after a finite proper time, you collide with the time-reversed collapsing star emerging from the white hole.”

Arrow of Time FAQ Sean 2007

For every solution to the equations of motion, there is exactly one time-reversed solution — it just happens to also involve a parity inversion and an exchange of particles with antiparticles.

Arrow of Time FAQ Sean 2007

(More rigorously, for every allowed process there exists a time-reversed process that is also allowed, obtained by switching parity and exchanging particles for antiparticles — the CPT Theorem.)

Arrow of Time FAQ Sean 2007

What did you think of the analogy with the time-reversed solar system?

Arrow of Time FAQ Sean 2007