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# How to go faster than light/ barcamp chiangmai 6 @pruet

How to go faster than light? What can be done, what can't ? and how?

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### How to go faster than light/ barcamp chiangmai 6 @pruet

1. 1. How to go faster than light. "Scotty, push it right to the edge!"
2. 2. Speaker @pruet
3. 3. How to go faster than light? ● Light speed is not fast enough. ○ Milkyway's diameter is about 10^5 light-year ○ Andromeda galaxy is about 2.5 megalight-year away ● Physical limitation ○ General relativity said that ... " no object can accelerate to the speed of light in the reference frame of any coincident observe". ● How to avoid physical limitation ○ Move to another space -> hyperspace jump -> "Jump" ○ Don't move yourself -> move the space -> "Push"
4. 4. Jump to where? ● To higher space/dimension (i.e., hyperspace) ○ 4th dimension, 5th dimension, ... ○ How? ■ Blackhole/whitehole ■ Wormhole (Einstein-Rosen Bridge) ○ Theoretically impossible by now (update me please) ■ require exotic material with negative energy density. ○ Who uses this? ■ Star wars folk... . ╮(─▽─)╭
6. 6. Push what? ● Basically your spaceship does nothing, but the space around you is pushed forward, then you follow the flow. ○ Think about surfing
7. 7. How? ● By contracting and expanding the space, before and behind the spaceship. ○ "Warp bubble" ● Based on "Alcubierre drive" theory, formulated in 1994 (~ 30 years after the original Star Trek series) ● Alcubierre drive suggests that by using very high energy, we can collapse and expanding the space. ○ Problem: very large amount of energy required
8. 8. How? ● OK, how much of that? ○ To move a small spaceship across Milkyway, you need 10^64 kg mass-energy equivalence (Einstein goes here) ○ How large is 10^64 kg? it's more that estimated mass of the universe itself. ● So, is it also theoretically impossible ? ○ First, we can use "negative mass" to generate that amount of energy. ■ Btw, negative mass is not "anti-matter", generally speaking, anti-matter has positive mass. ■ Negative mass is theoretically possible
9. 9. In Startrek? ● matter/anti-matter annihilation ● Fictional "dilithium" crystals is used separate matter/anti-matter.
10. 10. How soon? ● According to NASA, by carefully designing the drive engine, we requires very small amount of energy (energy-mass equal to the mass of Voyeger spacecraft) ○ 10 times faster than light ○ They are testing the idea now at Johnson Space Center now. ■ Using laser to expand/contract the space ■ More info, google "White–Juday warp-field interferometer" ● So how soon? ○ Maybe before we send that guy to Mars .

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• #### leechonho

Sep. 28, 2013

How to go faster than light? What can be done, what can't ? and how?

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