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Wormhole yes, time machine no

lanceromega

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Report this May. 25 2005, 2:22 am

Wormholes are major source of debate among astrophysicists, one of the more distributing aspect is that a time machine can be created by moving one end of the wormhole at relativitic velocities.

A recent paper shows that stable wormholes that use exotic matter to remain open will actually have the effect of being unpredictable, landing tthe users in time or places not of their choosing even dumping users to alternate universes.

No wonder the "Sliders" crew was never able to find their way home. Check out:

http://news.bbc.co.uk/2/hi/science/nature/4564477.stm

LtColSheppard

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POSTS: 14585

Report this May. 25 2005, 5:05 pm

For a beginner, what's "exotic matter"?

lanceromega

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Report this May. 25 2005, 8:09 pm

Quote (LtCol_Sheppard @ May 25 2005, 2:05 pm)
For a beginner, what's "exotic matter"?

Well normal matter has positive energy which means that gravity would be attractive, Exotic matter would be a substance with negative energy, so gravity would be repulsive.

Giantevilhead

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Report this May. 25 2005, 11:16 pm

It would suck if wormholes dump people into alternate universes since there would be no way of getting back.

lanceromega

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Report this May. 25 2005, 11:58 pm

Quote (Giantevilhead @ May 25 2005, 8:16 pm)
It would suck if wormholes dump people into alternate universes since there would be no way of getting back.

Well you can try jumping back into the wormhole, but there no way to know that it will take you back to the right universe.

You could attempt to make a Wormhole that they call classical, like those first written about by einstein and Rossen, but the attempt to use it will cause the wormhole to collasp.

also the paper state the smaller the wormhole, or the shorter the distant spanned the more you can predict the location of the other end, but once you start moving the wormhole you start making it unpredictable.

this article go into the details:

http://www.newscientist.com/article.ns?id=dn7418

LtColSheppard

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Report this May. 26 2005, 5:59 am

How do one know if the wormhole is mono-directional or not, with these "exotic matter"?

lanceromega

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Report this May. 26 2005, 6:22 am

Quote (LtCol_Sheppard @ May 26 2005, 2:59 am)
How do one know if the wormhole is mono-directional or not, with these "exotic matter"?

wormholes should be bidirectional, but due to their unstable nature, the mouths of the wormhole can actually shift location in space, and time.

The exotic matter is used to keep the mouths open, any matter entering the wormhole would normally cause it to collasp into a blackhole.. Now with this exotic matter the wormhole is now in the realm of quantum gravity ( just like the inside of a backhole) and standard relativitic theory cannot predict it behavior..

Enter one end and you emerge out into another universe, enter again and ou end up arriving before you left. enter again and now you emerge at barnad star, each time you enter the wormhole you cause it to shift location...

It almost like the show "sliders"

LtColSheppard

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Report this May. 26 2005, 12:47 pm

Sounds risky to me.

charlie_x

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Report this Jun. 06 2005, 1:22 am

Could a wormhole be viewed simplistically like - A vortex- or tornado?

If No, question over.

If Yes, Could 2 spinning bianary nutron stars closing in together possibly form such a vortex?

lanceromega

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Report this Jun. 06 2005, 2:19 am

Quote (charlie_x @ June 05 2005, 10:22 pm)
Could a wormhole be viewed simplistically like - A vortex- or tornado?

If No, question over.

If Yes, Could 2 spinning bianary nutron stars closing in together possibly form such a vortex?

No, they are basically a tunnel created of space..

Tangent

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Report this Jun. 06 2005, 7:13 pm

Quote (lanceromega @ May 25 2005, 5:09 pm)
Quote (LtCol_Sheppard @ May 25 2005, 2:05 pm)
For a beginner, what's "exotic matter"?

Well normal matter has positive energy which means that gravity would be attractive, Exotic matter would be a substance with negative energy, so gravity would be repulsive.

how do we know it exists?!

lanceromega

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Report this Jun. 06 2005, 8:09 pm

Quote (Tangent @ June 06 2005, 4:13 pm)
Quote (lanceromega @ May 25 2005, 5:09 pm)
Quote (LtCol_Sheppard @ May 25 2005, 2:05 pm)
For a beginner, what's "exotic matter"?

Well normal matter has positive energy which means that gravity would be attractive, Exotic matter would be a substance with negative energy, so gravity would be repulsive.

how do we know it exists?!

actually we can create negative energy via the Casimir effect. Basically by using two metal plates and placing them apart by a distants of about 1 micrometer we can generate an attractive force due to quantum fluctuation that create an area of negative energy or exotic matter. see the following diagram:

http://physicsweb.org/objects/world/15/9/6/pw1509061.gif

Because the space is so small between the two base, more vitual fields exist outside the plate and force the plate together.

Another source of exotic matter would be the region of space bordering on the Horizon of blackholes, due to Quantum fluctuation and it interaction with the gravity field we get the creation of particles called Hawking radiation , and the creation of negative energy which is quickly neutralize by taking energy from the mass energy of the blackhole causing them to steadily shrink..

Tangent

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POSTS: 2349

Report this Jun. 06 2005, 10:26 pm

Quote (lanceromega @ June 06 2005, 5:09 pm)
Quote (Tangent @ June 06 2005, 4:13 pm)
Quote (lanceromega @ May 25 2005, 5:09 pm)
Quote (LtCol_Sheppard @ May 25 2005, 2:05 pm)
For a beginner, what's "exotic matter"?

Well normal matter has positive energy which means that gravity would be attractive, Exotic matter would be a substance with negative energy, so gravity would be repulsive.

how do we know it exists?!

actually we can create negative energy via the Casimir effect. Basically by using two metal plates and placing them apart by a distants of about 1 micrometer we can generate an attractive force due to quantum fluctuation that create an area of negative energy or exotic matter. see the following diagram:

http://physicsweb.org/objects/world/15/9/6/pw1509061.gif

Because the space is so small between the two base, more vitual fields exist outside the plate and force the plate together.

Another source of exotic matter would be the region of space bordering on the Horizon of blackholes, due to Quantum fluctuation and it interaction with the gravity field we get the creation of particles called Hawking radiation , and the creation of negative energy which is quickly neutralize by taking energy from the mass energy of the blackhole causing them to steadily shrink..

so is negative energy created by exotic matter? does this casmir effect work in space (ferther away from the gravity of earth) is does exotic matter get atracted to anti gravity (if anti gravity exists?)

lanceromega

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POSTS: 3859

Report this Jun. 06 2005, 11:43 pm

Quote (Tangent @ June 06 2005, 7:26 pm)
Quote (lanceromega @ June 06 2005, 5:09 pm)
Quote (Tangent @ June 06 2005, 4:13 pm)
Quote (lanceromega @ May 25 2005, 5:09 pm)
Quote (LtCol_Sheppard @ May 25 2005, 2:05 pm)
For a beginner, what's "exotic matter"?

Well normal matter has positive energy which means that gravity would be attractive, Exotic matter would be a substance with negative energy, so gravity would be repulsive.

how do we know it exists?!

actually we can create negative energy via the Casimir effect. Basically by using two metal plates and placing them apart by a distants of about 1 micrometer we can generate an attractive force due to quantum fluctuation that create an area of negative energy or exotic matter. see the following diagram:

http://physicsweb.org/objects/world/15/9/6/pw1509061.gif

Because the space is so small between the two base, more vitual fields exist outside the plate and force the plate together.

Another source of exotic matter would be the region of space bordering on the Horizon of blackholes, due to Quantum fluctuation and it interaction with the gravity field we get the creation of particles called Hawking radiation , and the creation of negative energy which is quickly neutralize by taking energy from the mass energy of the blackhole causing them to steadily shrink..

so is negative energy created by exotic matter? does this casmir effect work in space (ferther away from the gravity of earth) is does exotic matter get atracted to anti gravity (if anti gravity exists?)

Well it the other wa around, negative energy or a negative energy density create exotic matter.

Negative energy would generate antigravity that why it is proposed to be used to keep the mouth of a wormhole open.

Antigravity, is created by either negative energy, exotic matter or by negative pressure ( pressure being a source of Gravity was discovered by Einstein). And Einstein proposed that this negative pressure would balance the force of gravity to create a stable universe, neither contracting or expanding. On this he was wrong.

The inflation of the universe after the big bang is said to be the work of negative pressure, generated by inflation field/gas that would have created a repulsive gravitional force.

trekie2568

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POSTS: 310

Report this Jun. 12 2005, 5:26 pm

How do you know that you would be able to "jump" back in to the wormhole and not die like in the show stargate?

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