To pave the way for rapid interstellar travel, NASA propulsion researcher Harold “Sonny” White plans to manipulate space-time in the lab
The idea that nothing can exceed the speed of light limits our interstellar ambitions. How do we get round this? Within general relativity, there are two loopholes that allow you to go somewhere very quickly, overcoming the restriction of the speed of light. One is a wormhole and the other is a space warp.
What is a space warp and how can it help?A space warp works on the principle that you can expand and contract space at any speed. Take a terrestrial analogy. In airports we have moving walkways that help you cover distance quicker than you would otherwise. You are walking along at 3 miles an hour, and then you step onto the walkway. You are still walking at 3 miles an hour, but you are covering the distance much more quickly relative to somebody who isn’t on the belt.
What would a starship with warp drive be like?Imagine an American football, for simplicity, that has a toroidal ring around it attached with pylons. The football is where the crew and robotic systems would be, while the ring would contain exotic matter called negative vacuum energy, a consequence of quantum mechanics. The presence of this toroidal ring of negative vacuum energy is what’s required from the math and physics to be able to use the warp trick.
What would it be like to travel at warp speed?You would have an initial velocity as you set off, and then when you turn on the ring of negative vacuum energy it augments your velocity. Space would contract in front of the spacecraft and expand behind it, sending you sliding through warped space-time and covering the distance at a much quicker rate. It would be like watching a film in fast forward.
Even if travelling at warp speed is theoretically possible, don’t the huge energy requirements make it unlikely?When the idea was first proposed mathematically in 1994 it required a vast amount of negative vacuum energy which made the idea seem impossible. I did some work in 2011 and 2012 as part of the 100 Year Starship symposium and discovered ways to reduce the energy requirements by many orders of magnitude, so for a 10-metre diameter spacecraft with a velocity of 10 times light speed, I can reduce the negative energy needed.
How close are you to making this a reality?We are very much in the science rather than the technology phase. We have got some very specific and controlled steps to take to create a proof of concept, to show we have properly understood and applied the math and physics. To that end we will try to generate a microscopic instance of a warp bubble in the lab and measure it.
If successful is the next stop Alpha Centauri? We don’t just go from the lab to an interstellar mission. There will be intermediate steps, other things we would do with this long before we get to some of the romantic pictures of a captain on the bridge telling the helmsman to engage warp drive.
White and his colleagues have begun experimenting with a mini version of the warp drive in their laboratory.
They set up what they call the White-Juday Warp Field Interferometer at the Johnson Space Center, essentially creating a laser interferometer that instigates micro versions of space-time warps.
“We’re trying to see if we can generate a very tiny instance of this in a tabletop experiment, to try to perturb space-time by one part in 10 million,” White said.
He called the project a “humble experiment” compared to what would be needed for a real warp drive, but said it represents a promising first step.
And other scientists stressed that even outlandish-sounding ideas, such as the warp drive, need to be considered if humanity is serious about traveling to other stars.
“If we’re ever going to become a true spacefaring civilization, we’re going to have to think outside the box a little bit, were going to have to be a little bit audacious,” Obousy said.
via Warp (2012)
That’s not Elon Musk, looks a bit like him in this photo, however. No word on success of the warp drive, but there was an EM drive announcement in 2015.
In April 2015, the space enthusiast website NASASpaceFlight.com announced, based on a post on their site’s forum by NASA Eagleworks engineer Paul March, that NASA had successfully tested their EM Drive in a hard vacuum – which would be the first time any organization has claimed such a successful test. In November, 2016, Harold White, along with other colleagues at NASA’s Eagleworks program published their findings on the proposed EM Drive.