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Scene 0
Kurisu
Could you come with me for a moment?
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Kurisu
Huh?
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Kurisu
Stop fooling around and come with me.
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Kurisu
What are you talking about?
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Kurisu
I just need to ask you something.
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Kurisu
What's with this 'Organization' stuff?
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Kurisu
...
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Kurisu
Huh? Your phone's off.
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Kurisu
...Who were you talking to?
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Scene 0
Kurisu
...So you talk to yourself.
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Scene 1
Kurisu
What were you trying to tell me earlier?
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Kurisu
About fifteen minutes ago. Before the conference started.
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Kurisu
You were trying to tell me something, right? You looked really upset.
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Kurisu
You looked like you were going to start crying any second.
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Scene 1
Kurisu
Why? Have we met before?
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Scene 1
Kurisu
And how do you know my name?
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Scene 1
Kurisu
Huh?
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Scene 1
Kurisu
Is there something wrong?
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Scene 1
Kurisu
O-ow!
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Scene 1
Kurisu
Hey, that hurts! Let me go!
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Scene 2
Kurisu
What's wrong with you?
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Scene 2
Kurisu
Hey! Could you not talk about me like that? I'm perfectly fine.
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Scene 2
Kurisu
It came from the future?
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Kurisu
Interesting...
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Kurisu
...
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Kurisu
...Hey.
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Scene 2
Kurisu
Are you trying to get yourself arrested?
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Scene 2
Kurisu
What truth, you perv!? You stupid!? Wanna die!?
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Scene 2
Kurisu
No way! Did you just see my underw...!?
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Kurisu
...
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Scene 3
Kurisu
Wait. Doctor Nakabachi?
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Scene 3
Kurisu
Excuse me, um...
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Scene 3
Kurisu
Okay, Hououin-san. I'd like to hear your story in more detail.
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Scene 3
Kurisu
Huh? Oh, right. Thank you.
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Scene 3
Kurisu
Um, I'd like to thank everyone for coming to hear me speak today.
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Scene 3
Kurisu
It's my first time giving a lecture like this, so please forgive me if I'm a little nervous.
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Scene 3
Kurisu
For today's lecture, I've been asked to speak on the subject of time travel. It's not really my area of expertise, but I'll try my best.
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Scene 3
Kurisu
Let me start by saying that time travel is an absurd concept.
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Scene 3
Kurisu
Hwa...!?
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Scene 3
Kurisu
Um... okay. It's fine, I guess. It'll be easier to talk in a discussion format.
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Scene 4
Kurisu
But before that, please listen to my thoughts on the subject.
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Kurisu
Scientists have proposed many theoretical models of time travel, but there are eleven in particular that bear mentioning.
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Kurisu
Neutron Star Theory. Black Hole Theory. Lightspeed Theory.
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Kurisu
Tachyon Theory. Wormhole Theory. Exotic Matter Theory.
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Kurisu
Cosmic String Theory. Quantum Gravity Theory. Cesium Laser Theory.
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Kurisu
Elementary Particle Ring & Laser Theory. Dirac Antiparticle Theory.
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Kurisu
However, all of these models are purely theoretical.
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Kurisu
Some of them even contradict each other.
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Kurisu
Hm? Ahh, uhh, right, well...
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Kurisu
It could be contradicted by the 13th model, now couldn't it?
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Scene 5
Kurisu
By the way, time travel to the future is available to us right now, according to Einstein's special theory of relativity.
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Scene 5
Kurisu
For example, let's say someone were to go to Haneda Airport and board a plane headed to Okinawa. Upon arrival, that person would be about one hundred millionth of a second farther into the future than I am.
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Kurisu
According to the special theory of relativity, time moves slower for objects as they approach the speed of light.
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Kurisu
For example, if you could run at near the speed of light, you could reach a point where time only moves half as fast for you.
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Kurisu
If you were to keep running at that speed for 24 hours, 48 hours would elapse in the rest of the world, meaning you would 'jump' one day into the future. Understand, Hououin Kyouma?
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Scene 5
Kurisu
Yes, you're right.
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Kurisu
Going to the past is possible right now. Take a look at the sky at night. You can see light from tens of thousands of years ago, can't you?
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Kurisu
Well, I was just getting started.
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Kurisu
Let's say we wanted to make a machine that could physically transport people through time. What would we need?
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Kurisu
The best candidates for this are cosmic strings and wormholes.
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Scene 6
Kurisu
A cosmic string is a string-shaped 'crevice' with extreme mass.
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Kurisu
The crevice is about as wide as an elementary particle, and at least as long as the diameter of a galaxy.
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Kurisu
It has immense mass, so it distorts space-time. If you were to travel through that distortion, you could make a full circle around the string in less than 360 degrees.
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Kurisu
In short, you can do something resembling a warp. This is called a space-time angular deficit.
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Kurisu
When you pass through an area of angular deficit, transit time becomes zero.
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Kurisu
Now we apply this to a cosmic string moving at near-light speed.
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Kurisu
According to the special theory of relativity, time will flow slower for the cosmic string in relation to its surroundings. Therefore, passing through the area of angular deficit would cause the transit time to become negative instead of zero.
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Kurisu
In other words, you will arrive in the past after transit.
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Kurisu
If you use two cosmic strings, you can do a space deficit jump. If you loop back to your original location, you can return to the same time you started revolving.
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Kurisu
And that, roughly speaking, is time travel by means of cosmic strings.
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Kurisu
By the way, just so nobody misunderstands, cosmic strings are not the same as superstrings.
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Kurisu
Now then, you need three things in order to travel to the past with cosmic strings.
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Kurisu
First. The cosmic strings themselves. Two strings, to be exact. By the way, they are hypothesized to exist only where the universe was first formed, so they might be a little hard to find.
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Kurisu
Second. You would need the energy required to make them move them at near-light speed.
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Kurisu
How much energy do you think you'd need to accelerate something as long as the Milky Way to near the speed of light? I'm pretty sure it's a little more than 1.21 jigowatts.
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Kurisu
Third. You'd need a spaceship capable of reaching these cosmic strings and returning. With the time traveler alive, of course.
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Kurisu
What do you think, Hououin-san? Care to take on the challenge of cosmic string time travel?
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Kurisu
Hm? Looks like Hououin-san doesn't want to take the challenge.
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Kurisu
In that case, let's consider wormholes. They may be a little more realistic than cosmic strings.
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Kurisu
By the way, Hououin-san. Do you know what wormholes are?
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Kurisu
Yes, that's correct.
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Kurisu
There are two wormholes joined by a tunnel. No matter how far away the wormholes are, transit time through the tunnel is zero.
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Kurisu
But oh no, there's a problem. The wormhole tunnel suffers from super gravity, and collapses as soon as it opens.
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Kurisu
So we need something to negate the effect of gravity.
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So-called 'exotic matter'. A substance with negative mass which repulses other matter.
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Kurisu
Say that the wormhole tunnel is being squished by an invisible fist.
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Kurisu
In order to pass through, you need something that could oppose my fist's 'grasping force' so that I can't squish anymore.
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Kurisu
If you stabilize the tunnel with exotic matter injection, instantaneous travel between wormholes becomes possible. To travel through time, however, takes a little more effort.
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Kurisu
For example, let's say there's a wormhole entrance here in Akihabara, and the exit is in Los Angeles.
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Kurisu
First, we send the wormhole in LA all the way to the end of the universe at near the speed of light. And once it's there, we yank it back to LA.
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Kurisu
According to the special theory of relativity, time slows down for objects moving at the speed of light. Meaning the hole that returned to LA would be further in the past than the Akihabara hole.
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Scene 9
Kurisu
So now, if Hououin-san jumped into the wormhole, he'd arrive in LA several years before he left.
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Scene 9
Kurisu
However, this still can't be called true time travel. It only seems that way. This is called the Urashima effect.
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Kurisu
The important part is to return to Akihabara from LA through the wormhole once more. Since the transit time is zero...
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Kurisu
Hououin-san will return to Akihabara several years in the past. Time travel complete.
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Scene 9
Kurisu
The prerequisites for wormhole travel are simpler than the ones for cosmic string travel.
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Scene 9
Kurisu
First. The wormhole itself. They may exist somewhere in the universe. But nobody has ever seen one.
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Kurisu
Second. The energy required to move a wormhole to the end of the universe and back at near-light speed.
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Kurisu
Third. Exotic matter, which, by the way, has not been confirmed to exist.
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Now do you see what I meant when I said that time travel is an absurd concept?