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Old March 23rd, 2021, 09:11 AM
Werner Werner is offline
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Default Exotic Matter Drives

This is the stuff that keeps wormholes open and makes warp drives possible, it is matter with negative mass-energy, when in large concentrations it produces antigravity fields and it has negative inertia. For game purposes exotic matter is found in nuggets at negative densities similar to the positive densities of neutron stars, and the usually are positively charged or negatively charged but never neutral as like charges attract and opposite charges repel due to negative inertia.

How would this affect the Traveller Universe if it was widely avaliable?
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Old March 23rd, 2021, 09:43 AM
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This is the stuff that keeps wormholes open and makes warp drives possible, it is matter with negative mass-energy, when in large concentrations it produces antigravity fields and it has negative inertia. For game purposes exotic matter is found in nuggets at negative densities similar to the positive densities of neutron stars, and the usually are positively charged or negatively charged but never neutral as like charges attract and opposite charges repel due to negative inertia.
My understanding according to theoretical-based conjecture is that positive mass would always be attractive (toward either positive or negative mass) and negative mass would always be repulsive (toward either positive or negative mass): https://en.wikipedia.org/wiki/Negati...Runaway_motion

On the Talking M-Drive Acceleration thread, ATPollard and I were discussing some topics tangentially related to this:

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Perhaps the MD just reduces mass relative to the universe slowly so I accelerate until I am massless and travel at the speed of light. Then what happens if it continues to reduce mass and I start to have negative mass (which is the equivalent of negative energy). Will I accelerate past the speed of light?
I have always thought that would be an interesting basis for an ultra-tech Inertialess Drive - one in which the rest-mass of the ship can be "tunably" decoupled from the Higgs Field (which gives fundamental particles their intrinsic rest-masses), allowing the ship to produce a pseudo-acceleration as the inertial-mass gets "tuned down" toward zero.

An interesting consequence of negative mass would be that it experiences a repulsive force from either a positive or negative mass, while at the same time a positive mass would attract either a positive or negative mass. The result is that a negative mass and a positive mass coupled together would accelerate as a unit toward lightpseed in order to preserve conservation of momentum and energy (remember, the masses as well as the velocities will have signs in the conservation equation), which is completely counter-intuitive.

There are actually scientific papers written on this conjectural topic. See: https://arc.aiaa.org/doi/abs/10.2514...urnalCode=jpp&

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How would this affect the Traveller Universe if it was widely avaliable?
  1. It would revolutionize STL travel for one thing. Maneuver Drives with no reaction mass or power requirements for drive operation. (Perhaps there would be other energy costs or complications associated with producing/maintaining the negative-mass in a useful configuration, however).
  2. You would potentially have a true perpetual motion machine that does NOT violate the laws of physics, especially if you can convert the system to circular motion in some fashion.
  3. Depending on the speed a particular FTL negative mass-drive (Alcubierre Warp-Drive) could achieve at a given TL, there could be potential interstellar travel in less than 1 week.
  4. There could be potential FTL-communication systems
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Old March 23rd, 2021, 10:45 AM
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Originally Posted by whulorigan View Post
My understanding according to theoretical-based conjecture is that positive mass would always be attractive (toward either positive or negative mass) and negative mass would always be repulsive (toward either positive or negative mass): https://en.wikipedia.org/wiki/Negati...Runaway_motion

On the Talking M-Drive Acceleration thread, ATPollard and I were discussing some topics tangentially related to this:
The greater mass magnitude wins out. You could have a negmatter planet orbiting a positive mass star, it will orbit a little slower at the same radius as a positive mass planet. At the densities I'm talking about, this negmatter planet would have a diameter measured in centimeters and it would be held together by something other than gravity. Maybe electric charge a negmatter planet would have a positive charge and be surrounded by a cloud of electrons.
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Old March 23rd, 2021, 12:13 PM
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I got to think carefully. The gravitational formula has two masses and if the sum of the two masses is positive then the gravitational force between them will be attractive, if the sum is negative thenforce will be repulsive.
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Old March 23rd, 2021, 12:28 PM
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I got to think carefully. The gravitational formula has two masses and if the sum of the two masses is positive then the gravitational force between them will be attractive, if the sum is negative then force will be repulsive.
Sum? Newtonian Gravitational Force is proportional to the Product of two masses. Or am I misunderstanding what you are getting at?

But the relationship for positive and negative masses is based on the articles I referenced above. You cannot simply assume the Newtonian formula works algebraically for negative mass in the same way as positive mass, as Newton did no experiments with, nor took into account negative masses in his formulation. We also have a much more sophisticated understanding of Gravity than Newton did as well.
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Old March 23rd, 2021, 02:01 PM
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Originally Posted by whulorigan View Post
Sum? Newtonian Gravitational Force is calculated based on the Product of two masses. Or am I misunderstanding what you are getting at?

But the relationship for positive and negative masses is based on the articles I referenced above. You cannot simply assume the Newtonian formula works algebraically for negative mass in the same way as positive mass, as Newton did no experiments with, nor took into account negative masses in his formulation. We also have a much more sophisticated understanding of Gravity than Newton did as well.
I was going from memory, didn't have the equation right in front of me. We have no experience with negative mass at all, there are a few guesses. Antigravity would have tidal force, it would have a pan caking effect rather than a stretching on. The part of you that was closest to the antigravity source would be pushed away the hardest. Antigravity would obey the inverse square law just as gravity does. And while gravity bends space creating a gravity well, antigravity would create a gravity hill, light would bend away from the source of antigravity. Stable orbits are impossible to achieve as centrifugal force and antigravity both work in the same direction unlike with gravity where they cancel each other out to achieve orbit.

Time would move faster the higher up the antigravity well you would climb. Light traveling outward would be blue shifted. You can't make a black hole with negative mass, the event horizon would be turned inside-out and be something you cannot enter rather than escape from. Time would also be infinitely accelerated at that inside-out event horizon and a white hole would only last for an instant, there would be and explosion and it would be gone, while black holes last nearly forever!

Also when negative mass comes in contact with positive mass, you have nullification rather than annihilation, whereas matter and antimatter produce energy, matter and negative matter just produce nothing. If you drop negative matter into a black hole, it shrinks, that is what Hawking radiation is, negative matter falling into a black hole leaving its positive matter twin particles to come out as radiation.
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Old March 25th, 2021, 04:28 AM
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Quote:
Originally Posted by Werner View Post
This is the stuff that keeps wormholes open and makes warp drives possible, it is matter with negative mass-energy, when in large concentrations it produces antigravity fields and it has negative inertia. For game purposes exotic matter is found in nuggets at negative densities similar to the positive densities of neutron stars, and the usually are positively charged or negatively charged but never neutral as like charges attract and opposite charges repel due to negative inertia.

How would this affect the Traveller Universe if it was widely avaliable?
Well if this were widely available, for the purposes of a Traveller setting, wouldn't that possibly mean the FTL drives and antigrav technology might be based upon the use of exotic matter?

And thus wouldn't there be some sort of method to harvest and store this matter for use in starship drives, whether they be sublight or for FTL travel?

Possibly FTL travel in this setting might be warp drive based or it might be keyhole drive based (using wormholes).

I in fact once bought a Traveller setting product, specifically for the Cepheus Engine variant, which postulated that starships used exotic matter instead of hydrogen for FTL fuel to help open up wormholes since the FTL varisnt used was for a keyhole drive instead of a jump drive.

You could essentially travel 4x as far as a jump drive ship, but all the fuel was artificially created essentially and you had no hope of wilderness refuelling if you ran out of fuel for the FTL drive.

The formula in use for fuel use for the drive was:
Quote:
A starship will expend an amount of NegMat equal to one quarter the amount of fuel an equivalent Jump Drive would consume. For example, a 100 dton starship traveling two parsecs via Rabbithole would expend 5 dtons of NegMat. (0.1 x ship’s tonnage x distance in parsecs/4)
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Old March 25th, 2021, 05:57 AM
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The starship can harvest it's own negative matter out of the quantum foam, but this requires energy. Negative matter tends to decay over time so this requires a continuous expenditure of energy, the Starship can lift off the ground and accelerate in the desired direction.

A warp drive is like the above described maneuver drive but on steroids. You need a large positive mass in front of the Starship and a large negative mass behind the Starship, this is harvested from the vacuum and a black hole and its opposite is created, the tidal forces of both are balanced out and the Starship is propelled forward at superluminal velocities through spacial expansion and contraction.

Last edited by Werner; March 25th, 2021 at 06:22 AM..
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