Various Aspects of Exotic Propulsion Systems

Travelling into the dark is too hazardous especially if you wish to contact extraterrestrial civilization–even at a high relativistic speed, it would take almost 21 years to reach to the nearest earth like planet, Gliese 581 g. Various mechanisms have been proposed to make it possible within our short life times however, none of them are either feasible to accomplish the mammoth task of interstellar travel. Almost all of them have already been reviewed on WeirdSciences[select category ‘quantum physics/astrophysics’].

One means to produce force is collisions. Conventional rocket propulsion is fundamentally based on the collisions between the propellant and the rocket. These collisions thrust the rocket in one direction and the propellant in the other.To entertain the analogy of collision forces for a space drive, consider the supposition that space contains a background of some form of isotropic medium that is constantly impinging on allsides of a vehicle. This medium could be a collection of randomly moving particles or electromagnetic waves, either of which possess momentum. If the collisions on the front of a vehicle could be lessened and/or the collisions on the back enhanced, a net propulsive force would result. We know that dark matter and negative energy are ubiquitous in this universe. Quantum fluctuations are more optimistic approach to get a picture of future propulsion technologies. For any of these concepts to work, there must be a real background medium in space. This medium must have a sufficiently large energy or mass density, must exist equally and isotropically across all space, and there must be a controllable means to alter the collisions with this medium to propel the vehicle. A high energy or mass density is required to provide sufficient radiation pressure or reaction momentum within a reasonable sail area. The requirement that the medium exist equally and isotropically across all space is to ensure that the propulsion device will work anywhere and in any direction in space. The requirement that there must be a controllable means to alter the collisions ensures that a controllable propulsive effect can be created.

Critical Issues

The critical issues for both the sail and field drives have been compiled into the problem statement offered below. Simply put, a space drive requires some controllable and sustainable means to create asymmetric forces on the vehicle without expelling a reaction mass, and some means to satisfy conservation laws in the process. Regardless of which concept is explored, the following criteria must be satisfied.

(1) A mechanism must exist to interact with a property of space, matter, or energy which satisfies these conditions:
(a) must be able to induce an unidirectional acceleration of the vehicle.
(b) must be controllable.
(c) must be sustainable as the vehicle moves.
(d) must be effective enough to propel the vehicle.
(e) must satisfy conservation of momentum.
(f) must satisfy conservation of energy.

(2.1) If properties of matter or energy are used for the propulsive effect, this matter or energy…
(a) must have properties that enable conservation of momentum in the propulsive process.
(b) must exist in a form that can be controllably collected, carried, and positioned on the vehicle, or be controllably created on the vehicle.
(c) must exist in sufficiently high quantities to create a sufficient propulsive effect.

(2.2) If properties of space are used for the propulsive effect, these properties…
(a) must provide an equivalent reaction mass to conserve momentum.
(b) must be tangible; must be able to be detected and interacted with.
(c) must exist across all space and in all directions.
(d) must have a sufficiently high equivalent mass density within the span of the vehicle to be used as a propulsive reaction mass.
(e) must have characteristics that enable the propulsive effect to be sustained once the vehicle is in motion.
(3) The physics proposed for the propulsive mechanism and for the properties of space, matter, or energy used for the propulsive effect must be completely consistent with empirical observations.

Now it depend on us what kind of propulsion technology might be dispensable according to future needs.
[Ref: Challenge to Create the Space Drive by Millis M.]

About bruceleeeowe
An engineering student and independent researcher. I'm researching and studying quantum physics(field theories). Also searching for alien life.

One Response to Various Aspects of Exotic Propulsion Systems

  1. Martin J Sallberg says:

    In 1994, Miguel Alcubierre proved theoretically that warp drive,
    expanding spacetime behind a spacecraft and contracting spacetime in
    front of the spacecraft, do not violate relativity even faster than light.
    His original paper stated that it would require impossible amounts of
    negative energy, but that problem can be circumvented. Multiple
    scientific theories, including string theory, independently predict that
    gravity and electromagnetism unify in higher dimensions. Space-time
    thus can be manipulated by forcing an electromagnetic field to leave
    normal space-time. One idea is to use vacuum energy deficiency
    created by the Casimir effect to “suck” an electromagnetic field out of
    normal spacetime (graphene is ideal for generating Casimir effect),
    another is to place many supraconductors close to
    each other, blocking escape through normal space-time so that the
    Meisner effect forces the electromagnetic field out of normal space-
    time. You should test both possibilities. Of course manipulated space-
    time can not only be used for Alcubierre drive but also for cheap, safe,
    environmentally friendly spacelaunches. There is a possible problem
    that faster than light Alcubierre drive would create an event horizon
    which would generate lethal Hawking radiation, but that can be avoided
    by having several “warp engines” each contributing a slower than light
    effect, but the combined effect is faster than light (continuous warp
    metric). A continuous warp metric would have the advantage of creating
    no event horizon and thus no Hawking radiation.
    While Alcubierres original warp metric was
    represented by a single deep “trench” in front of the spacecraft and a
    single steep “slope”
    behind the spacecraft, a continuous warp metric would be represented
    by a low “plain” or a series
    of shallow “trenches” in front of the spacecraft and a high “plain” or a
    series of moderate “slopes” behind
    the spacecraft.

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