TED Conversations

Sean Carroll

theoretical physicist,


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LIVE TED Conversation: Join TED Speaker Sean Carroll

LIVE conversation with cosmologist Sean Carroll, TEDxCaltech Speaker and author of From Eternity to Here: The Quest for the Ultimate Theory of Time.

The conversation will open at 4pm (Eastern Standard Time), May 19, 2011. Sean is on vacation in Las Vagas, and will join us from his hotel room there to discuss the cosmos, the nature of time, and the science of poker.


Closing Statement from Sean Carroll

Thanks for participating, everyone! I hope some light was shed. It's been a pleasure chatting with the TED community.

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    May 19 2011: If a property of entropy is to expand over time, if there were a way to reverse linear time, would there also be a corresponding way to reverse entropy or would it continue to expand as it's not a property related to the progression of time?
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      May 19 2011: The only real way to define "reversing time" is by "decreasing entropy." In the real world, you can set up a system of just a few atoms in which that happens (and people have done so), but once you get more than a few dozen particles it becomes infeasible.
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        May 19 2011: Since time is affected by a Black Hole, what effect would result from entropy encountering the event horizon of a black hole or the hole's powerful center?
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          May 19 2011: Nothing special happens at the event horizon, actually; it's just a point of no return, past which you can't get back to the outside world. Black holes absorb new material and more entropy all the time -- the effect is just that you get a bigger black hole!

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