For quite some time, I'm thinking about this First Quantum Gravity Solution particular resolution of Einstein General Relativity equations. It's actually a link in My sources of this blog since 2008.
It represents the space-time deformation caused by a single photon.

The main question is:

What's important about a photon, is that it has energy like any mass, and it travels at the speed of light.

Since the scientific community expect gravity to propagate at the speed of light also, a photon cannot have a gravitational impact in front of him.

If it did, there will be a "gravitational shock wave"! Basically huge accumulation of space-time deformation.

Anyway, the equation is fully solve and the amazing result is:

The impact on space time of a photon is only on the perpendicular plane of the photon momentum vector.

It means that

When I saw the results from NASA about the emDrive, I thought about this again.

Can this anisotropie be used to create acceleration.

Here is my thought experiments:

First let's imagine 2 flat circular perfect mirrors very close to each other. In between theses mirrors a huge quantity of photon bumping back and forth.

Space-time around this object will look this:

No thrust will appear here expects that the mirrors will get bigger :)

Now if you bend the mirrors in a spherical or parabolic shape, there may be a way to concentrate the deformation in front of the mirrors.

So, the mirrors will naturally fall in front of the sphere. There will be thrust/acceleration.

Even placing a small mass at the concentration point may help the forward movement.

Like this:

I'll love to know what's wrong with my thought experiment? :D

There should be a back of the hand calculations, using the EM energy set in the drive, converting this to a static mass, and seeing the impact of such mass as a gravitational attraction.

You may get the same ridiculously small impact out of huge amount of energy :D

The main question is:

**Are we living in a boring, fun or cool Universe?**What's important about a photon, is that it has energy like any mass, and it travels at the speed of light.

Since the scientific community expect gravity to propagate at the speed of light also, a photon cannot have a gravitational impact in front of him.

If it did, there will be a "gravitational shock wave"! Basically huge accumulation of space-time deformation.

Anyway, the equation is fully solve and the amazing result is:

The impact on space time of a photon is only on the perpendicular plane of the photon momentum vector.

It means that

**a photon generates an anisotropic deformation of space time.**When I saw the results from NASA about the emDrive, I thought about this again.

Can this anisotropie be used to create acceleration.

Here is my thought experiments:

First let's imagine 2 flat circular perfect mirrors very close to each other. In between theses mirrors a huge quantity of photon bumping back and forth.

Space-time around this object will look this:

No thrust will appear here expects that the mirrors will get bigger :)

Now if you bend the mirrors in a spherical or parabolic shape, there may be a way to concentrate the deformation in front of the mirrors.

So, the mirrors will naturally fall in front of the sphere. There will be thrust/acceleration.

Even placing a small mass at the concentration point may help the forward movement.

Like this:

I'll love to know what's wrong with my thought experiment? :D

There should be a back of the hand calculations, using the EM energy set in the drive, converting this to a static mass, and seeing the impact of such mass as a gravitational attraction.

You may get the same ridiculously small impact out of huge amount of energy :D

## 2 comments:

I think I've seen a paper in a scientific review regarding photon propulsion a few years ago ... your post seems to have some sense if I remember well :-)

Yes there is a way to throw photons at the back of device, and get thrust. It's a Nuclear photonic rocket.

But the thrust is even less than what they got in the emDrive, and I still did not see anyone talking about General Relativity in relation to emDrive! Which is the fun part here :D !

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