Wormhole

[alokmohan]

A wormhole is a hypothetical shortcut for travel in distant points in the universe.The wormholes has two entrances called mouth ,one ,for example near the earth,the other for example in orbit around Vega nearly 26 light years away.The mouths are connected to each other by a tunnelthrough hyperspace(the wormhole that might be only a km long.If we enter near the earth mouth,we find ourselves in the tunnel.By travelling just one kilometer down the tunnel we reach the outer mouth and emerge near Vega 26 light years away as measured in the external universe.This is how Kip Thorne explains in nice simple words.

 

[alokmohan]

When Carl Sagan finished his CONTACT,he cotacted Kip thorne .as Sagan was not a relavity expert.Sagans heoine wanted to go to Vega from a black hole.Kip told him that you cant go to hyperspace as there are too many bubbles bursting inside black hole,vehicle will be destroyed.He suggestd warm hole.The novel was rewritten

 

[qso1]

Strange worm...a mouth on both ends.<br /><br />Seriously however, the explanation is nice and simple. But assuming wormholes actually exist or can be made to exists through artificial means. We will have to figure out how to make it emerge where we wish it to, and thats no simple task. <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>

 

[derekmcd]

Creating them is probably the easy part... it's holding them open where the challenge will be.<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>

 

[qso1]

Creating them probably would be easier than keeping them open. But wormholes are the stuff of theoretical physics rather than something actually observed IIRC. <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>

 

[alokmohan]

Kip Thorne has given adequate explanation of this in his book Blackholes.Assuming it exists ,You may may be a daily passener with office situated at say vega.Like a tube rail.You can go there within minutes.

 

[qso1]

I understand the concept itself and hope one day we find it works. It would make intergalactic travel a lot more likely assuming wormholes can shorten such distances. <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>

 

[alokmohan]

qso,you may like it.Time machine of Kip Thorne.

 

[alokmohan]

With the idea of a traversable wormhole now established as a possibility, given the existence of exotic matter, there now exists the possibility of creating a time machine. In his book, Black Holes and Time Warps, Kip Thorne explains how he and his wife can conspire to make a time machine from a single wormhole. He first asks us to assume that we are a sufficiently advanced society such that we can create and manipulate wormholes. Or at least that such a society exists and has made us such a wormhole. This established, he then assumes that he has a small wormhole through hyperspace with a tunnel of say half-a-meter in length. He has both mouths of the wormhole in his living room and time is connected through the wormhole such that if he sticks his hand in one mouth it will instantly appear coming out of the other mouth across the room. His wife, Carolee, now takes one mouth with her into the family space ship and Kip remains in the living room with the other mouth. They hold hands through the wormhole (see figure 6) and Carolee takes off with the space ship. She accelerates to relativistic speeds and goes off into space for 6 hours. All the while she and Kip can look through the wormhole and see each other. After 6 hours she turns the ship around and heads back to Earth which takes another 6 hours. After 12 hours have passed Kip will look through the wormhole still holding hands with Carolee and see that she has landed and is now out in the front yard. So he will let go and start toward the door to go out and greet her when he notices that she is not out there yet. The relativistic speeds and accelerations that she has encountered have dilated her time so that in Kip's view she is still out in space on her journey holding hands with him. So Kip waits for her arrival...he waits 10 years. When she finally arrives he goes out to greet her. He opens the door of the craft and finds her not having aged more than 12 hours since her departure with her hand still in the worm

 

[qso1]

I'll have to get a copy of that and read it, fascinating stuff, thanks. <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>

 

[alokmohan]

This time travel.It may go in the forward direction as also backward direction.Backward time travel raises paradoxes.If one gets back in time and kills his mother at a time before his birth,how the paradox stands?You cant be born .THEN HOW CAN YOU TRAVEL FORWARD?

 

[alokmohan]

Exotic Matter<br />Q. Got a question about exotic matter, the type used in wormholes specifically. Is it particulate in nature, composed of particles analogous to quarks, leptons, etc? If so, how big (hypothetically) are these particles? If ey are any larger than Planckscale, how are ey rammed down the throat of an initially Planckscale wormhole to initially stabilize and begin enlarging it?<br /><br />A. Actually until someone makes some, I don't know that anyone knows for sure. Typically, both here and in other things I've read, exotic matter is usually conceptualized as being very similar in appearance/structure to neutronium: A very dense and massive substance that is made up of exotic particles jammed very tightly together.<br /><br />As for opening the wormhole: During the initial 'capture' of a wormhole from the quantum foam, negative energy alone is used to 'grab' the wormhole as it momentarily expands from the sea of quantum interactions. The energy captures the hole, holds it open and expands it enough to thread it with exotic matter which then takes over the job of holding the hole open. Think of using a high energy laser or magnetic field to temporaily boost an object into the air before rapidly sliding a pillar under it to hold it up off the ground. In principle you could just 'levitate' the object indefinitely using the energy, but the pillar is a more stable and longer lasting solution.<br /><br />Q. Separately, how is exotic matter kept from blocking the wormhole (organized in such a way that it allows ships and other such objects to pass through) as it holds it open?<br /><br />A. In the RL there is actually a class of wormhole 'designs' that set up the exotic matter along the 'edges' of a frame supporting the wormhole, leaving the wormhole mouth open for transit. Matt Visser IIRC pioneered this design based on the math of wormholes. So a wormhole might be a cube, a pyramid, or even a duodecahedron. Each face of the wormhole is a potential exit/entrance.<br></br>

 

[qso1]

Quite the paradox indeed. You may recall a movie made in 1980 or thereabouts. Called 'The Final Countdown". The aircraft carrier Nimitz is taken back to WWII. Stars Martin Sheen and Kirk Douglas. Martins character brought up a similar paradox on backward time travel. <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>

 

[alokmohan]

If one time travels to 1776,what may happen?If one travels back to 1905.theory of relativity may be killed.

 

[alokmohan]

The discovery that worm holes require exotic material to hold them open,triggered much theoritical research in1988 to 92.Do the laws of physics permit exotic material to exist and if so under what circumstances?This was the central issue. A key to the answer had already been provided in the 70s by Stephen Hawking.In 1970 ,when proving thart surface areas of black hole always increase,Hawking had to assume that exotic matter cannot exist near black holes horizon.If exotic matter ....... In 1974 came a great surprise.:Hawking inferred as a by produt of his discovery of black hole evaporation ,that vacuum flucuations near a black holes horizon are exotic in nature.They had negative energy density.

 

[qso1]

alokmohan:<br />If one time travels to 1776,what may happen?If one travels back to 1905.theory of relativity may be killed. <br /><br />Me:<br />In which case, the time traveller who went back would cease to exists since presumably. The time machine would in part be based on the theory of relativity. Its paradoxes like these that tend to make me think that backwards time travel is either not possible or somehow restricted by physical laws.<br /><br />Too many weird paradoxes. <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>

 

[alokmohan]

Hawking thinks so.But Kip is full of enthu.

 

[alokmohan]

The laws of general relativity predict unequivally that two time flows will be same when compared through the warm hole,but will be different when compared outside the warm hole.Time in this sense hooks up to itself differently through the warmhole than through the external universe.,when the two mouths are moving relative to each other.