Black hole complementarity 2

Instead, an observer can only detect the information at the horizon itself, or inside, but never both simultaneously. Complementarity is a feature of the quantum mechanics of noncommuting observables, and Susskind proposed that both stories are complementary in the quantum sense.

Interestingly enough, an infalling observer will see the point of entry of the information as being localized on the event horizon, while an external observer will notice the information being spread out uniformly over the entire stretched horizon before being re-radiated. To an infalling observer, information and entropy passes through the horizon with nothing strange happening. To an external observer, the information and entropy is absorbed into the stretched horizon which acts like a dissipative fluid with entropy, viscosity and electrical conductivity.

— Wikipedia on Black hole complementarity

2012.10.30 Tuesday ACHK

Steampunk

DanielBMarkham 2 days ago | link | parent

The time between about 1860 and 1910 seems totally magical to me.

For all of history, people lived, loved, and died. Aside from perhaps a few of them writing their thoughts down, they totally disappeared.

With the invention of still photography, and much more audio and moving-picture recording technology, suddenly you could see and hear people who were long gone.

These folks are not just dead. Their kids are dead, their grandkids are dead, their great-grandkids are probably also gone. Yet we are able to hear them play music, tell stories, and laugh. They might even tell a joke and we can laugh along with it.

It’s as if mankind suddenly came out of a very dark tunnel. We are finally able to really coalesce into a multi-generational conversation about what our humanity means. (A little too poetic. Apologies. I just find it amazing[.])

— Hacker News

2012.10.30 Tuesday ACHK

無常

機會率哲學 1.4

這段改編自 2010 年 4 月 3 日的對話。

「隨機」的意思是,沒有原因,而導致我們,不可直接明確推斷,事件會有哪一個結果。但是,你可以再追問,何謂「沒有原因」呢?

我們可以改用,詳細一點的講法。「隨機」的意思是,對於同一個固定不變的物理系統,即使是同一組的輸入,輸出的結果也不一定每次相同。

— Me@2012.10.30

2012.10.30 Tuesday (c) All rights reserved by ACHK