離線Physics of the Impossible by Michio Kaku is a popular science book published early this year. It challenges what most people think of impossible these days. I found class 1 impossibilities quite possible, as it doesn't violate any widely known physical law. Class 2 impossibilities are quite impossible, as it violate most currently known physical laws. Class 3 impossibilities are the most interesting class, which include the possibility of faster than light, time travel and parallel universes. Take a look if you are interested.
http://en.wikipedia.org/wiki/Physics_of_the_Impossible
http://www.amazon.com/Physics-Impossible-Scientific-Explorat...
Check out http://hk.youtube.com/profile?user=rishwanm for more videos.
Content
Part I: Class I Impossibilities
1: Force Fields 3
2: Invisibility 16
3: Phasers and Death Stars 34
4: Teleportation 53
5: Telepathy 70
6: Psychokinesis 88
7: Robots 103
8: Extraterrestrials and UFOs 126
9: Starships 154
10: Antimatter and Anti-universes 179
Part II: Class II Impossibilities
11: Faster Than Light 197
12: Time Travel 216
13: Parallel Universes 229
Part III: Class III Impossibilities
14: Perpetual Motion Machines 257
15: Precognition 272
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Blog: http://theprincipia.blogspot.com/
11: Faster Than Light 197
12: Time Travel 216
13: Parallel Universes 229
Nick兄,非常有趣!但有沒有詳細點的資料??
Physics of the impossible (cont'd)
I have a proposal to eliminate all the possible earthquake. The method is to drill and deep hole that penetrate the earth crust, and then inject water into the hole, eventually remove the heat of the earth mantle and cool it down. Then without heat, the mantle will cool down and the earth plates will no longer move. So, no more earthquake.
Please check PM.
=P
Website: http://chanlikhangnick.googlepages.com/index.html
Blog: http://theprincipia.blogspot.com/
Most of what I heard to fight with speed of light, people generally imagine ways to make a object faster, i.e. concern with the speed.
But as you all know space and time glue together, Kaku suggested that we may do something with the space.
Kaku's proposal on how to travel faster than light:
you and contact the space in front of you, then you
would have the illusion of having moved faster than light. In
fact, you would not have moved at all. But since space has
been deformed, it means you can reach the distant stars in a
twinkling of an eye.
2. Ripping space. In 1935 Einstein introduced the concept
of a wormhole. Imagine the Looking Glass of Alice, a
magical device that connects the countryside of Oxford to
Wonderland. The wormhole is a device that can connect two
universes. When we were in grade school, we learned that
the shortest distance between two points is a straight line.
But this is not necessarily true, because if we curled a sheet
of paper until two points touched, then we would see that
the shortest distance between two points is actually a wormhole.
Website: http://chanlikhangnick.googlepages.com/index.html
Blog: http://theprincipia.blogspot.com/
Wikipedia has a detail entry, with dozens of external links, on time travel: http://en.wikipedia.org/wiki/Time_travel
A general object goes like: if time travel is possible, why haven't we met any folk from the future?
One seeks an answer with parallel universe. When we travel back, we travel to another universe.
Kaku's central idea is to think of the physics of the event horizon.
Some concluding remarks on time travel:
proved that Hawking's program to ban time travel was inherently
flawed. Bernard Ray, Marek Radzikowski, and Robert Wald showed
that time travel was consistent with all the known laws of physics, except
in one place. When traveling in time, all the potential problems
were concentrated at the event horizon (located near the entrance to
the wormhole). But the horizon is precisely where we expect Einstein's
theory to break down and quantum effects to take over. The
problem is that whenever we try to calculate radiation effects as we enter
a time machine, we have to use a theory that combines Einstein's
theory of general relativity with the quantum theory of radiation. But
whenever we naively try to marry these two theories, the resulting theory
makes no sense: it yields a series of infinite answers that are meaningless.
This is where a theory of everything takes over. All problems of
traveling through a wormhole that have bedeviled physicists (e.g., the
stability of the wormhole, the radiation that might kill you, the closing
of the wormhole as you entered it) are concentrated at the event horizon,
precisely where Einstein's theory made no sense.
Thus the key to understanding time travel is to understand the
physics of the event horizon, and only a theory of everything can explain
this. This is the reason that most physicists today would agree
that one way to definitively settle the time travel question is to come up
with a complete theory of gravity and space-time.
Website: http://chanlikhangnick.googlepages.com/index.html
Blog: http://theprincipia.blogspot.com/
Thanks Nick, and ha.. I like Hawking's cute idea!
The fun with such "impossible" classes of problems is not just whether things turn out real or not, but rather through pushing our understanding to such extremes, we've got really to a point to appreciate different facets and probable limitations of theories.
博學之士，佩服！
博學之士，佩服！ x2
Class 3 impossibilities are the most interesting class, which include
the possibility of faster than light, time travel and parallel
universes.//
算唔算 logically impossible?
御用閒人,
I just realise there was a typo, I meant class 3 is quite impossible, while class 2 is the interesting case.
I reread Mr Zhang's Analytic Logic the other day, on time travel (p.126 - 142) and found it quite convincing, I recommend any interested reader to read it.
Website: http://chanlikhangnick.googlepages.com/index.html
Blog: http://theprincipia.blogspot.com/
I reread Mr Zhang's Analytic Logic the other day, on time travel (p.126 - 142) and found it quite convincing, I recommend any interested reader to read it. //
無錯, 李天命同張海澎都認為係語理分析的問題.
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