Antigravity like soluctions of Einstein equations

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In summary, Felber has found a solution to the equation that describes the gravitational field near the speed of light. This leads to the gravitomagnetic approximation and some kind of gravitatory repulsion in certain circumstances. The solution is the first that accounts for masses moving near the speed of light, and if some favorable celestial body were to be found, drastic restrictions on the fuel necessary to accelerate a spaceship to near of light speeds could be implemented. However, there is a lack of relativistic black holes near Earth in any event, and working out the details of how to "hitch a ride" would not be all that useful in any practical sense.
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Sauron
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http://arxiv.org/PS_cache/gr-qc/pdf/0505/0505099.pdf

Franklin Felber says in this paper that for the first time has obtained the solution of the orbits of a particle near an ultrarelativistic central field (in second order of aproximation).

This leads to the gravitomagnetic aproximation and to some kind of gravitatory repulsión in certain circunstances.

Theoretically if some favorable celestial body (star) would be found that would allow drastic restrictions in the fuel necessary to acerlerate a ship to near of light speeds.

Well, ¿do you think it is really worthin or simply NASA publicity? (the author works for NASA).
 
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Exact solution of gravitational field equation

http://www.physorg.com/news10789.html
New antigravity solution will enable space travel near speed of light by the end of this century, he predicts.
On Tuesday, Feb. 14, noted physicist Dr. Franklin Felber will present his new exact solution of Einstein's 90-year-old gravitational field equation to the Space Technology and Applications International Forum (STAIF) in Albuquerque. The solution is the first that accounts for masses moving near the speed of light.
 
  • #3
If you have to wind up inside the event horizon of a black hole to utilize it, "antigravity" just isn't going to be very useful.

I do suspect that it is possible to gain some energy from a passing relativistic black hole via gravity without running into the event horizon, but the paper unfortunately doesn't make it very clear how this would be done. And it probably does not involve "antigravity" in any event.

What's really annoying about this is not the paper itself, but the associated irresponsible PR that's being encouraged by the authors and "peer reviewers".

Here is an example of the sort of statements that I think are irresponsible hype:

Felber's antigravity discovery solves the two greatest engineering challenges to space travel near the speed of light: identifying an energy source capable of producing the acceleration; and limiting stresses on humans and equipment during rapid acceleration.

"Dr. Felber's research will revolutionize space flight mechanics by offering an entirely new way to send spacecraft into flight," said Dr. Eric Davis, Institute for Advanced Studies at Austin and STAIF peer reviewer of Felber's work. "His rigorously tested and truly unique thinking has taken us a huge step forward in making near-speed-of-light space travel safe, possible, and much less costly."

If I want to hitch a ride to Alpha Centuari via a passing black hole without being crushed by the singularity, this paper doesn't make it clear how to do that. Getting in front of the BH just isn't a Good Idea.

There is also a (perhaps fortunate) lack of relativistic black holes passing near the Earth in any event, so working out the details of how to "hitch a ride" wouldn't be all that useful in any pragmatic sense.

BTW, having a "peer reviewer" associated with the "Institute of Advanced studies" (i.e Puthoff, et al) is NOT a good thing if one wants one's work to be taken seriously by the mainstream.
 
  • #4
"His rigorously tested and truly unique thinking has taken us a huge step forward in making near-speed-of-light space travel safe...

...at speeds where a speck of dust in your path becomes the mass of a boulder!:eek: Yea, real 'safe':biggrin:
Not to worry...it has been ''rigorously tested'...:rofl:

I wonder how many specks of dust you will encounter between here and Mars?:tongue2:
 

What is antigravity and how does it relate to Einstein's equations?

Antigravity refers to a hypothetical phenomenon in which gravity can be repulsive rather than attractive. This concept is often explored in the study of Einstein's equations, which describe the relationship between matter and spacetime.

Can antigravity solutions of Einstein's equations actually exist?

While there have been many theoretical models and solutions proposed, there is currently no evidence to support the existence of antigravity in our universe. The concept remains purely hypothetical and continues to be an area of ongoing research.

What implications would antigravity have on our understanding of the universe?

If antigravity solutions were to exist, it would fundamentally change our understanding of the laws of physics and the behavior of matter and energy in the universe. It could potentially open up new possibilities for space travel and exploration.

How are scientists researching and testing the concept of antigravity?

Scientists use mathematical models and simulations to explore the potential effects of antigravity solutions on Einstein's equations. They also conduct experiments on various forms of matter and energy to look for any evidence of repulsive gravity.

What are some potential applications of antigravity technology?

If antigravity were to be harnessed and controlled, it could have a wide range of applications in fields such as transportation, energy production, and space exploration. However, the development of such technology is currently only in the realm of science fiction.

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