Alcubierre

An intro to warp bubble

Today I want to talk about a subject that is under development and which, until many years, absolutely not see anything, how to travel faster than light.

As we know, there is nothing that travel faster than light and light travels at the speed limit in our universe. Let’s call this speed “c” by convention.

Unfortunately this speed is very slow or human life is very short. Why it is that “there is a convention” in which a trip can not last more than 50 years as it would be half the life of a person and if a device is created for travel whose journey lasting more than 50 years is considered you have to find another way faster propulsion.
If we could travel at the speed of light, journeys, on average, would be much higher than 50 years, which the human being is looking for faster than light travel methods.

Here comes into play what we know of physics and of our universe and a man, a Mexican named Miguel Alcubierre.
We know we can not travel, because as is the fabric of space, at relativistic velocities greater than c. In principle we would relativistic effects, such as time dilation. As I explain relativistic physics and example of the clock, time would pass at different “speeds” (as observer) quite dangerous for anyone traveling near “c”. This effect would stop time and therefore the traveling to loins, for example, a photon, would travel in the measurement time, the universe end to instantly end, although for non-inertial (read, the another observer) It will take an infinite time.

Another problem is the energy needed to reach that speed and a very important effect called the Cherenkov effect. This effect is because matter traveling nearby ac (I do not care the means by traveling) radiates electromagnetic energy because it breaks the barrier of maximum speed (something similar to break the sound barrier, where on ahead to here waves on ahead to light waves) except sound, wasting considerable energy and thus not allowing speeds greater than c. This effect can be seen in nuclear reactors where the propagation velocity of the medium is much less than c (about 0.7 c).

And finally, another problem is called “the concept of information”. And to remember that waves carry energy but not only that carry information about who or what generates this wave. At speeds greater than c matter would come before the information conveyed and this is impossible.

These are the reasons why we go to the brave to overcome c is impossible (physically speaking).

The fact is that Acubierre Miguel came up with a method to achieve speeds greater than c and is leverage the fabric of space itself.

Gravity is included in the equations of Einstein (general relativity) as a transformative space-time. That is, gravity, mass, generates distortion in space/time creating forces (gravity itself is one of them). By quantum mechanics it is vibration of a series of strings, in conjunction, cause the space vibrates and deforms. Acubierre thought that can take advantage of this way of creating a distortion in the continuum so that a positive pressure is created upon the object and a negative against the originating a push. A large serious features like where we bring in and out where we are.

The advantage of the metric is that the object you want to “send” is in a flat region of spacetime standard not to be affected by everything I said before. Itself does not move, the space moves.

In 1994 (if anyone cares) was published about the mathematical model, which is not very complicated and it is easy to understand.

And because you can travel faster than light?. In principle it would be using the speed at which time space is adjusted but, due to the dispersion of gravitational waves predicted by Einstein and detected nothing is unknown, the rate at which space-time is adjusted is precisely c, by what so neither could travel faster than light.
But (and there is always a but) if we remember the early days of the big bang (and now) the universe is expanding at rates (now) faster than light, then if the fabric of space-time expands at higher speeds cy therefore, if that will speeds greater than c can go at speeds greater than c.

With all this, it is mathematically plausible and, for now, is investigating the performance of an engine or a system for this. The only problem, Alcubierre, lies in the energy needed to create this “bubble” which is far superior to that in the universe. But also luckily, redefinitions of its metric, such as those of Richard K. Obousy and Gerald Cleaver have managed to refine the calculations necessary offering energy densities much lower than those calculated by Alcubierre and can be consulted in their paper.

What counts is that, string theory, gravity (which would be responsible for generating the distortion) is not as weak as we thought hard because all that happens is that affects vibrating strings in dimensions that have little effect to those we know with what a change in the strings that are affected that much less energy would be needed to generate the required field. Let ultimately if we extend the radius of one of the strings (really a plane, but so we understand it) where gravity affects more would be achieved with less energy, that force will affect more our size and so both could generate a warp bubble.

In addition, Obousy and Cleaver, incidentally, calculated the maximum speed that theoretically could be achieved, which is 10 ^ 32c, ie 10 ^ 32 times the speed of light. Although, of course, to get to generate a bubble that achieves this speed would take more energy than in the universe. Not everything will be free.

I’m not going to get tired more about it, but I recommend you see the following links:

Alcubierre metric
Richard K. Obousy and Gerald Cleaver paper

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