theoretical astrophysics questions

[spacenewbie]

what theoretical methods explain how ordinary matter could travel to a different universe in the same time within less then a day? <br /><br />what theoretical methods explain how ordinary matter could travel to a distant part of the galaxy or a distant galaxy of the same universe in the same time period less then a day?<br /><br />what theoretical methods explain how ordinary matter could travel into the past of the same universe or even let ordinary matter travel further back into the past of the same universe before the time machine was created?<br /><br />please expain how each of these thoretical methods work. also what kinds of theoretical methods allow for instant comunication from one point in the galaxy to a distant point or to a different galaxy, different universe, or even into the past and how does it all work? <br /><br /><br />

 

[SpeedFreek]

None of these scenarios have any methods within theoretical astrophysics that I know of, but it depends on your definition of "less than a day". Less than a day for whom? An observer or the matter doing the travelling?<br /><br />Theoretically you can travel any distance in "less than a day" whilst travelling just a little slower than the speed of light, due to time-dilation as described by special relativity.<br /><br />But there are no methods for travelling back to the past that I am aware of, nor for instant communication. <div class="Discussion_UserSignature"> <p><font color="#ff0000">_______________________________________________<br /></font><font size="2"><em>SpeedFreek</em></font> </p> </div>

 

[alkalin]

Interesting questions. My own opinions follow and are just guesses. I need to qualify my position as not a sci-fi writer, but a student of cosmology for many years.<br /><br />Your first question assumes there are different universes, which I do not. But expansion theory failed so they came up with inflation, a completely non-provable idea. It is strictly math and does not in any way relate to reality, although I have to add that anything is possible as of now with our level of universe understanding, which is very little.<br /><br />Your next question is not really clear to me on what you are asking. Inflation is not supposed to involve local matter such as in a galaxy, only space.<br /><br />The third is a very speculative question on science fiction which I am no expert on.<br /><br />I can only offer what it is I currently understand that makes more sense to me as an individual. But in regards your fourth question, time is not a variable that can progress into past or future, since past and future are virtual realities in our mind and nothing more. However, I feel communication can occur instantly in the universe, and it comes from the action at a distance of QM.<br />

 

[kyle_baron]

Welcome to SDC.<br /><font color="yellow"><br />what theoretical methods explain how ordinary matter could travel to a different universe in the same time within less then a day? </font><br /><br />Not a different universe, maybe a different dimension. You'd have to see the threads on The Philadelphia Experiment. Deals with intense magnetic fields.<br /><font color="yellow"><br />what theoretical methods explain how ordinary matter could travel to a distant part of the galaxy or a distant galaxy of the same universe in the same time period less then a day? </font><br /><br />I'm reading a book right now called Slip String Drive which is faster than light travel by using gravity waves. IT IS FACINATING. It doesn't violate Relativity, because the motion is not thru space. But, by opening a hole in space-time by using more gravity waves in one direction, than another, movement WITHIN space is accomplished FTL. I've also heard of this technology, on a Discovery Channel UFO-Area 51 program. Where captured UFO's are being reversed engineered, by some guy that used to work there.<br /><font color="yellow"><br />what theoretical methods explain how ordinary matter could travel into the past of the same universe or even let ordinary matter travel further back into the past of the same universe before the time machine was created? </font><br /><br />In the Slip String Drive book with FTL travel within space, he says it's not possible. Unless you watch old Star-Trek episodes! <img src="/images/icons/wink.gif" /><br /><font color="yellow"><br />please expain how each of these thoretical methods work. also what kinds of theoretical methods allow for instant comunication from one point in the galaxy to a distant point or to a different galaxy, different universe, or even into the past and how does it all work? </font><br /><br />I'm afraid you'll have to do some reading on your own. These ideas can't be spoon-fed. Slip String Drive at Amazon.c <div class="Discussion_UserSignature"> <p><font size="4"><strong></strong></font></p> </div>

 

[SpeedFreek]

I would just like to point out that theoretical astrophysicists endeavour to create theoretical models and figure out the observational consequences of those models. This helps allow observers to look for data that can refute a model or help in choosing between several alternate or conflicting models.<br /><br />So my original reply was in the context that there are no current models in theoretical astrophysics for travelling to different universes. With FTL travel there are a few models but they all rely on things like gravity waves as Kyle mentioned (which have not been directly detected, only inferred so far), or other more exotic principles.<br /><br />As for instant communication, Alkalin mentioned Quantum Mechanics. The "action at a distance" he refers to is (I suspect) quantum entanglement.<br /><br />It is possible to prepare two particles in a single quantum state such that when one is observed to be spin-up, the other one will always be observed to be spin-down and vice versa, this despite the fact that it is impossible to predict, according to quantum mechanics, which set of measurements will be observed.<br /><br />As a result, measurements performed on one system seem to be instantaneously influencing other systems entangled with it. But quantum entanglement does not enable the transmission of classical information faster than the speed of light due to the No communication theorem <div class="Discussion_UserSignature"> <p><font color="#ff0000">_______________________________________________<br /></font><font size="2"><em>SpeedFreek</em></font> </p> </div>

 

[alkalin]

Yes, I was referring to entanglement, something we actually know very little about so far. But the “no communication theorem†reminds me of the math used to prove that airplanes could not fly before it was demonstrated that they could. This type of math is able to prove anything in the mind of the author, either for or against some idea. Current cosmology is full of it.

 

[derekmcd]

First, I will make my own assessment of "<i>less then [sic] a day</i>" to mean faster than the speed of light.<br /><br />"<i>what theoretical methods explain how ordinary matter could travel to a different universe in the same time within less then a day?</i>"<br /><br />White holes. I'm not so sure, though, I would consider white holes to be a 'theoretical method'.<br /><br />"<i>what theoretical methods explain how ordinary matter could travel to a distant part of the galaxy or a distant galaxy of the same universe in the same time period less then a day? </i>"<br /><br />Wormholes.<br /><br />These are actually theoretical and quite plausible, though our currently infant technology still have wormholes in the realm of science fiction.<br /><br />"<i>what theoretical methods explain how ordinary matter could travel into the past of the same universe or even let ordinary matter travel further back into the past of the same universe before the time machine was created?</i>"<br /><br />Travelling at velocities greater than the speed of light in which case time would reverse. As mentioned above, wormholes might be plausable if we could accelerate one end of the wormhole to relativisitic speed, travel to the accelerated end and return to the point of origin.<br /><br />"<i>also what kinds of theoretical methods allow for instant comunication from one point in the galaxy to a distant point or to a different galaxy</i>"<br /><br />Quantum entanglement. I'm really stretching for this one as there is really no physical communication and no way to use entanglement to transfer information faster than C, but very interesting nonetheless.<br /><br /><br /> <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>

 

[derekmcd]

Guess I should read other posts first <img src="/images/icons/smile.gif" />. Didn't even notice entanglement was already mentioned. <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>

 

[spacenewbie]

does anybody know theoreticly if there is a method used to determan how long it takes a spaceship using alcubierre drive to travel from one point in the galaxy to the other or even from one point in the galaxy to another galaxy. If there is a theoretical method, what is the method called? <br /><br />thoereticly where could primordial black holes exist in the universe? could they exist anywhere in the universe or only in certain places? <br /><br /><br /><br />

 

[SpeedFreek]

<font color="yellow"> does anybody know theoreticly if there is a method used to determan how long it takes a spaceship using alcubierre drive to travel from one point in the galaxy to the other or even from one point in the galaxy to another galaxy. If there is a theoretical method, what is the method called? </font><br /><br />An Alcubierre drive works by warping space around it to cause the fabric of space ahead of a spacecraft to contract and the space behind it to expand. In order to make an Alcubierre drive you need to find some <i> exotic matter, </i> something science has not come across as of yet, as the Alcubierre metric requires negative energy density.<br /><br />Theoretically, the time it takes to travel a certain distance using an Alcubierre drive is simply a function of speed over distance. There is no time-dilation within the warp bubble generated by the Alcubierre drive, so time passes at the same rate within the bubble as it does for an inertial frame of reference outside that bubble.<br /><br />What this means is you actually have to travel at many multiples of the speed of light to get anywhere fast! Define the maximum speed of your drive and do the maths. If the drive can make 100 times the speed of light, then you can travel 100 light years in one year. Our galaxy is around 100,000 light years across... so I doubt an Alcubierre drive is a practical solution to galactic travel on the larger scales.<br /><br />It may also be worth considering the drive as something that works constantly, warping space around it to a larger and larger degree until you turn it off. The warp bubble would move space around it at an increasing rate. This rate would define how long a journey over a given distance would take, analogous to an acceleration. But this is entering the realms of science-fiction.<br /><br />The Alcubierre drive, although theoretically possible, requires as of yet undi <div class="Discussion_UserSignature"> <p><font color="#ff0000">_______________________________________________<br /></font><font size="2"><em>SpeedFreek</em></font> </p> </div>