sethoflagos Posted August 15, 2016 Share Posted August 15, 2016 (edited) This one has perplexed me for some time. Scenario: Travelling close to light speed towards say the Andromeda galaxy. If we were to look directly towards our destination, would we be totally frazzled by intensely blue-shifted radiation? (Assuming we didn't have a really good pair of Ray-Bans) Edited August 15, 2016 by sethoflagos Link to comment Share on other sites More sharing options...
Mordred Posted August 15, 2016 Share Posted August 15, 2016 yes all signals ahead would be extremely blueshifted Link to comment Share on other sites More sharing options...
Sensei Posted August 15, 2016 Share Posted August 15, 2016 In Special Relativity Relativistic Doppler Effect has formula [math]f=f_0(1+v)\gamma[/math] [math]\gamma=\frac{1}{\sqrt{1-v^2}}[/math] Which is also equal to [math]f=f_0\sqrt{\frac{1+v}{1-v}}[/math] with v normalized to 0...1 (divided by c). With v near 1.0 (or near c, without normalization), gamma is so high that regular photons at visible spectrum (average 2.32 eV green photon), could be blueshifted to more than 1.022 MeV (0.4-0.5 million times than green photon) In such situation there is starting pair production, of matter and antimatter, and positrons are starting annihilating with body of spacecraft, damaging it and destroying. 1 Link to comment Share on other sites More sharing options...
sethoflagos Posted August 15, 2016 Author Share Posted August 15, 2016 In Special Relativity Relativistic Doppler Effect has formula [math]f=f_0(1+v)\gamma[/math] [math]\gamma=\frac{1}{\sqrt{1-v^2}}[/math] Which is also equal to [math]f=f_0\sqrt{\frac{1+v}{1-v}}[/math] with v normalized to 0...1 (divided by c). With v near 1.0 (or near c, without normalization), gamma is so high that regular photons at visible spectrum (average 2.32 eV green photon), could be blueshifted to more than 1.022 MeV (0.4-0.5 million times than green photon) In such situation there is starting pair production, of matter and antimatter, and positrons are starting annihilating with body of spacecraft, damaging it and destroying. So Warp Factor 8 is a bit of a no go? Unless we travel into the void, which seems a bit pointless. Link to comment Share on other sites More sharing options...
michel123456 Posted August 21, 2016 Share Posted August 21, 2016 So Warp Factor 8 is a bit of a no go? Unless we travel into the void, which seems a bit pointless. ? But the void is full of photons. Link to comment Share on other sites More sharing options...
sethoflagos Posted August 21, 2016 Author Share Posted August 21, 2016 ? But the void is full of photons. It was a throwaway comment, Michel. But since you raise the point, not so many of the photons would be coming directly at me would they? Once their trajectories are sufficiently oblique, the blue shift issue goes away, doesn't it? Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now