Quote from: aceshigh on 04/20/2015 02:43 am I know Mulletron. What I want to know is exactly how Dr White theory deals with superluminal speeds, which most physicists say leads to time-travel to the past and all the paradoxes that surface from that.





According to the video I showed from Dr Davis, superluminal speeds WITHOUT time-travel to the past are possible, if the light cone is tilted from 0 to 90 degrees only...





I think this question is related to spaceflight applications exactly because time travel IS an issue at relativistic velocities (to the future) and superluminal velocities (to the past, but not according to Dr Davis)



This question is probably more related to the spaceflight applications of a warp drive than the pure theoretical issues of how EM and Warp Drives work on quantum level, since the first is a result of spaceflight application while the second (which is being discussed in this thread) is not.



Don't forget that the ship is not really moving at relativistic speeds: space is. Consequently, you could take a trip to Alpha Centauri in 2 days (or less with more power... who knows?), turn your ship around and observe the Earth as it was four years ago (as light has taken four years to get there - slow coach!). You could then observe Alpha Centauri as it is "now", and how people on the Earth will see it in four years.



With this type of technology, it would be possible to predict when locally past events are going to be observable from the point of view of the Earth (or any other point that the light from such events had not yet reached). For example, a ship 1 light-day out from the Earth in the right place could witness a supernova before the Earth does and then be able to return to the Earth almost instantly and tell astronomers about the incoming light wave so that they could prepare to observe it.



Proviso: I am not an expert in time travel and I also have doubts about Dr Who.



This is pretty much what I take from Dr. Eric Davis presentation: not all kinds of FTL travel due to space time distortions (e.g. warp drive) result in the light cones becoming inverted. A lot of them result in just allowing the light cone of a traveler to be slightly "sideways" (e.g. any tilting less than 45 degrees avoids "instantaneous" travel or time travel), allowing the traveler to reach the classically forbidden regions very fast but without paradoxes.In that way, you will be reaching "past" far away events from the point of view of your point of origin (being there before the light of those events reaches your point of origin), but not the past at your original light cone. As you say, if warp drives exist you could travel in a few days to Alpha Centauri, see what's going on there "in the past" from Earth's point of view (which is just due to you being traveling in a tilted light cone on a trajectory that takes you outside of the classically allowed in your light cone) and be back to report whatever you saw, but always strictly after you left.If warp drives exist in practice, I won't be surprised if these tilted light cones can't actually bend enough to allow instantaneous or backwards time travel, but they might allow very fast, but finite travel speeds, by tilting the light cone less than 45 degrees...But I digress: please dear Eagle Works team, continue the very valuable work of proving your points with experimental measurements, for everyone to see and replicate, and then we could emote and get excited about having impulse drives and warp drives. One step at a time.And I also excuse myself with our kind hosts: I promise this is the last post where I'll discuss unverified claims and hypothesis.Edit:I re-read my comment and I think I noticed a mistake: assuming the maximum tilt of the light cone should be less than 45 degrees is wrong. Because that implies that you and your ship could be potentially moving at less than c with respect to your own warp field (inside the allowed region of the tilted light cone), when all evidence suggest you would be stationary inside of it in order to be under its influence!Under this interpretation, a relatively stationary ship with a warp field tilting its light cone 45 degrees would be travelling exactly at c...In general, all ships inside a warp field would follow a trajectory that is identical to that of their surrounding field, so the need of having warp fields with light cones with a tilt less than 90 degrees. So aceshigh was right.