Geodesic propulsion

[Star reach]

Hi.
I need a device build that will test the feasibility of a geodesic propulsion.
For more physics info I will recommend you reading the following papers:

https://philarchive.org/archive/CHRHVO

https://ayuba.fr/pdf/forward1990.pdf

https://ntrs.nasa.gov/api/citations/20200000366/downloads/20200000366.pdf

https://ntrs.nasa.gov/api/citations/19960048672/downloads/19960048672.pdf

As you know from GR physics 1.1 every object has it's own geodesic through spacetime, for example a ball stationary in space has speed of c in time and a ball moving close to c in space has a temporal velocity close to 0.
Interesting thing happens when you add a gradient in spacetime, when one side of the object experiences slower time than the other side, the object will gain velocity towards the region of slower time, because every point of the object has to experience the same passage of time the universe will balance this by accelerating the object towards the slower time zone.
Essentially I want to create a device that will trade part of its temporal velocity to a spatial velocity.

I won't bother you with more physics but I assure you this is just a tip of the iceberg.


I need a two solenoids 20cm long attached at 90 degrees on a shaft so that when it is spined at highest possible rpm they will be free to move on the shaft towards the point of highest velocity.
According to my theory the solenoids should gain momentum, the question is at what speed of rotation and if possible the stronger the magnetic field the better. Superconducting solenoids should increase the effect because of the much higher field strength.
Here is a simple drawing.

 

[rb1957]

"spined" = spun

You're talking about rotational speeds near the speed of light. I doubt if we have materials that will support the loads produced.

I also have just about no idea what your sketch means !? The orange (solenoids ?) are attached to the central shaft ? and the shaft spins, and you want the solenoids to move where?

IDK if you can trade temporal velocity (in my day it was called "time dilation") for spatial velocity, since they rely on one another. The spatial velocity creates the temporal velocity ... no? reducing (or increasing) spatial velocity will reduce (or increase) the time dilation effect and so reduce (or increase) the temporal velocity.

But then, as Sheldon would say, I'm only an Engineer.

 

[WKTaylor]

 

[MintJulep]

Here is a simple drawing

Yep, it is.

 

[IRstuff]

I doubt if we have materials that will support the loads produced.

nor the energy required to accelerate something up to lightspeed, I'd imagine.

 

[rb1957]

say we could continuously add energy to the thing (maybe beam microwave energy onto it ?) then we could continuously accelerate it, no? The increase in velocity per unit energy input would reduce, clearly, but I think it would continue to increase ... at least until the input energy = the losses of the system (then it would just get hotter, no?) ... though I suspect it would've RUD'd long before this limit.

 

[IRstuff]

The issue is that achieving light speed for any object with substantive mass requires major fractions of Earth's total power output. A 1 ton object would require 1.3 TW of continuous power over one year to get to light speed. This would put the object half a light year away when it reaches light speed.

Beamed power will have to obey optical laws, and even with an antenna the size of the Earth, you'd need a sizable receiving antenna to capture even a fraction of the transmitted energy from Earth. For the case above, at the halfway point, an Earth-sized antenna beaming green light would have a beam footprint of 250 m, and even with a 250-m collector, that only captures about 86% of the beamed energy, and that assumes perfect pointing accuracy -- 0.1 picoradians worth. Assuming best case pointing accuracy of 1 nanoradian, the beam footprint would need to be around 2,500,000 m in diameter just to make sure the collector is within the footprint. That would result in a transfer efficiency of 10^-8

 

[MintJulep]

captures about 86% of the beamed energy

Well that sounds very favorable,

 

[rb1957]

ok, what if we used an orbiting power station satellite to produce a microwave beam to power this thing in orbit, or an a Larange point ?

and yes I know I'm being (at least slightly) silly ...

but I still have doubts about the original premise ... trading temporal velocity with spatial velocity.

 

[Star reach]

1.I'm sorry for the language I'm not a native English speaker.
2.I agree that no matter what, Noether's theorem holds ,meaning both conservation of momentum and energy apply and a propulsion system more efficient than a photon rocket is impossible.
3.This is a hypothetical solution where in fact nothing is being accelerated because the engine is in inertial reference frame meaning it follows its own artificial geodesic in spacetime(free fall) therefore no acceleration, no momentum conservation violation and no energy conservation violation.
4.This drawing represents one of the mechanical/macroscopic versions I've imagined, the other one I will present here later , by this point I'm looking into nuclear magnetic resonance of a deformed and hyper-deformed nuclei where using the resonance, all of the deformed nuclei on an engineered material are spun in a way where the top part of the atom is spun to a relativistic speeds and the bottom part is stationary forming a conical motion. The expected free fall motion will be towards the opening of the cone because the part of the atom that spins will be time dilated and the bottom part not. Because most of the mass of an atom is in its binding energy the deformed nucleus will act as an extended body where a gradient of time dilation can be applied.
5.From the point of view of electromagnetism it can be said that every magnet experiences a magnetic pressure near the poles, as it is spun asymmetrically so that one pole of the magnet is in time dilated region because of the velocity of motion, it's magnetic pressure near the time dilated region will appear to be lower and the other stronger magnetic pressure near the other pole will cause the magnet to be displaced in space.
6.From the point of view of GR both the object (the magnet) and it's magnetic field will act as an extended body where a time dilation gradient can be introduced with the spinning motion.
7.My mission is to help connect both engineers and physicists and actually achieve something extraordinary together, so I've have decided to put my ideas out there where I know there are very smart people who might spend some minutes of their time trying to visualize the same thing that I've visualized.

For a visualization purposes you can watch this part of a vsauce video where you can see how an extended body follows a geodesic without experiencing any forces.
Technically it is stationary from it's reference frame and it appears to accelerate from an external point of view.
Depending on the strength of the gradient, an extraordinary acceleration of the object from a point of view of an external observer can be achieved without any actual physical forces of acceleration on the object.

From around 21:13 minute mark to around 23:13.

 

[btrueblood]

Regarding negative mass - Forward showed how to use it to achieve limitless acceleration. Just need some negative mass matter, give me some of that and the rest is cake.

 

[SWComposites]

you would be better off working on a hypersonic flux capacitor powered by tri-dimensional di-lithium crystals.

 

[btrueblood]

Now you're just talking science fiction...

 

[IRstuff]

Depending on the strength of the gradient, an extraordinary acceleration of the object from a point of view of an external observer can be achieved without any actual physical forces of acceleration on the object.

Sure, all you need is a sufficiently massive black hole, not unlike Vsauce's thought experiment where the Sun is made into a black hole. You just have to wait a few billion years and see if it happens, or travel to the center of our galaxy to get one that already exists, which is only a measly 26,000 light years away. However, while you might not need energy to be accelerated to relativistic speeds when you're at Sagittarius A*, getting there in your lifetime is simply not going to happen, since even if you could get to light speed, it would take you 26,000 year to get there, and that assumes you accelerate to light speed instantaneously. Of course, taking a year to accelerate and a year to decelerate would simply mean a 26,000+2 yr journey