Friday , March 5 2021

Where's our Warp Drive to the stars?

In the franchise of science "Star Trek", the US presses the company back and forth across the universe, driven by the "base of driving". Unfortunately, for space travel enthusiasts, this seems to be contrary to Einstein's equations, which in general banned driving faster than light.

But with the hypothetical addition of the "exotic substance", this sci-fi invention actually corresponds to the boundaries of Einstein's theory of general relativity, which describes the gravitation and bending of space time with the substance.

Thus physicists calculated and discussed, without concluding, whether such a device could be built and used for traveling to the stars.

In 1994, Miguel Alcubierre was a physicist at the University of Cardiff, UK. "I watched "Star Trek," " Last year he remembered the talk at the Congress of the Star in 2017. (Yes, there are scientific conferences on how to build hubs.)

"I was thinking," said Dr. Alcubierre, "if you could get to the geometry of space-time, which was similar to this idea of ​​a basic science-fiction journey that allowed you to travel faster than light."

While equations of general relativity can be simply written, they can not be solved, except in some special cases.

What did dr. Alcubierre, now director of the Institute of Nuclear Sciences at the National Autonomous University of Mexico, has created a special solution for general equations of relativity that describe the "basic bubble".

The bubble would crash space in front and expand it back, and It seems that the star in the bubble moves at a speed that is faster than light, although it is still calm.

For example, Alpha Centauri, the closest neighboring star system, is 4.4 light-headed. Make a star in the base bubble. Lower the distance from the star to a few inches, stretch the space behind it to 4.4 light years, and then star a star from the star bubble.

Voilà! Averaging comes to Alfe Centauri, less than 4.4 years, it would need a beam of light to travel to that distance.

Dr. Alcubierre compared the concept to a moving corridor at the airport. "Just stand and move," he said. "You do not have to walk. Just push you together."

This relativity is crucial does not specify a speed limit to expand the space. "Space caexpand it at any speed it wants, "said Dr. Alcubierre.

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The biggest missing piece is that it distorts space-time, as described by dr. Alcubierre requires something that is not known to exist: substances with an energy density of less than zero. All known substances – stars, rocks, hot dogs, people and everything else – have a positive energy density, resulting from E = mc².

Space for conventional weight contracts. Negative energy has the effect of anti-gravity, which pushes the space you need for the aspect of the propulsion base that expands the space.

Physics does not exclude the possibility that there is a negative energy density. Some suggested that the Casimir effect might be a strange but proven phenomenon of quantum mechanics in which an empty vacuum can create electromagnetic forces in order to drag objects against each other – to create a negative energy density.

Even if this could be done, the early calculations indicated that the impossible size needed for conical driving energy – more energy than there is in space. Physicists later crashed to a more modest but still impractical quantity: the equivalent of the mass of Jupiter, converted into energy.

Many additional deficiencies should be solved. Other issues that physicists were dealing with are:

  • How much energy would you need to bend the room?

  • Do sprinkler devices need to deploy more time and time to operate more than a railroad in front of an asterisk?

  • Can the crew guide the basic bubble?

  • Would you come from the base to create an equivalent sound boom that would destroy the destination?

If it is possible to travel with more light, it could also be used for time travel. This would violate another nursing concept of physics: causality, the idea that the future can not change the past.

Actual drive can turn out to be current scientific attachment. As scientists still reveal the fundamental laws governing the universe, they can distinguish the principle that proves this impossible.

Nevertheless, Some NASA scientists, led by Harold G. White, a physicist at the Johnson Space Center in Houston, played the concept. They say that they have found a way to configure a hypothetical negative energy substance so that the deformation can be achieved by a mass equivalent to a Voyager spacecraft.

"What it does is to move an idea from a category completely impossible, that maybe credible," said Dr. White in a conversation with the NASA's Ames Research Center in 2014. "Do not say anything about the feasible. And so, unfortunately, this point is usually missed."

Although Dr. Alcubierre has come up with the idea of ​​a hard drive, he is not optimistic that everyone will be boldly leaving when no one will soon be coming soon.

"My opinion has not changed much, although I may be even more skeptical today," he wrote in an email this month. "Please note that I'm never talking about space ships. I have no idea how to start planning."

He added, "I should say that it is probably impossible, and although it turns out to be possible, we have probably been centuries of doing so."

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