The nearest star beyond our solar system is Proxima Centauri. A light year is the distance it takes light to travel in one le mas bleu leucate year. A new research paper written by an American physicist has proposed a theory for how faster-than-light travel could be possible.
- Since all the laws of physics take the same form in terms of any system of inertial coordinates , it follows that whatever capability for superluminal signaling exists in terms of one inertial coordinate system must exist in terms of every other.
- No scientists really doubted this notion, but there was no easy way to test it.
- The light from these distant objects has been traveling for so long that, when we finally see it, we are seeing the objects as they were billions of years ago.
- The supermassive black hole at the center of the accretion disk sends a narrow, high-energy jet of matter into space, perpendicular to the black hole’s accretion disc.
- Einstein also believed heavily in causality which is an important component of relativity.
But the math of time travel does affect the things we use every day. NASA’s space telescopes also give us a way to look back in time. Telescopes help us see stars and galaxies that are very far away. It takes a long time for the light from faraway galaxies to reach us. So, when we look into the sky with a telescope, we are seeing what those stars and galaxies looked like a very long time ago. Seth Lloyd, professor of quantum-mechanical engineering at MIT, investigates hypothetical methods of time travel, both forward and back.
Albert Einstein And His Thought Experiments
General relativity was developed after special relativity to include concepts like gravity. It maintains the principle that no object can accelerate to the speed of light in the reference frame of any coincident observer. However, it permits distortions in spacetime that allow an object to move faster than light from the point of view of a distant observer. One such distortion is the Alcubierre drive, which can be thought of as producing a ripple in spacetime that carries an object along with it. Another possible system is the wormhole, which connects two distant locations as though by a shortcut. Both distortions would need to create a very strong curvature in a highly localized region of space-time and their gravity fields would be immense.
Yes, everyone on Earth will have aged four years and you will have aged only 2 weeks. It would take less time to get from the Earth to the Sun. But time travel or faster than is impossible for any human because of the limitation of the human body. Humans have specific blood pressure, heartbeat rate, and many particular mechanisms that are very vulnerable. So it is theoretically possible for time travel and faster than light speed.
Can The Universe Expand Faster Than The Speed Of Light?
If a laser beam is swept across a distant object, the spot of laser light can easily be made to move across the object at a speed greater than c. Similarly, a shadow projected onto a distant object can be made to move across the object faster than c. In neither case does the light travel from the source to the object faster than c, nor does any information travel faster than light. In some materials where light travels at speed c/n other particles can travel faster than c/n , leading to Cherenkov radiation . As an imperfect example, think about two rafts floating down a river at a constant speed. The river forks into two branches, with one raft floating down each of the branches.
Our Earthly Limitations
Bender proposes traveling by completely isolating a region of spacetime from the rest of our universe using Einstein’s gravity waves. These compression waves of spacetime are generated by a ship, which emits them from its hull in all directions until it is completely isolated from the rest of our universe. Then, by emitting more gravity waves behind the ship, it stretches out its isolated bubble into an egg-shape, causing external spacetime to squeeze in on the bubble unevenly, propelling the craft forward at speeds no longer limited by relativity. Time passes normally within the isolated region, eliminating the possibility of paradox or time travel.
„First, rigorously follow from the general principles of special theory of relativity and therefore are well justified…“ There isn’t an issue for single particles moving FTL, as you pointed out so well in your video; different observers simply disagree about which end „emitted“ the particle. It’s a problem for macroscopic systems which have their own internal entropy. Seems you think that this entropy related arrow of time you are talking about is really the fundamental concept. Like Schrodinger’s equation, it can evolve the system in either time direction.
Many physicists believe that the above phenomena are impossible and that future theories of gravity will prohibit them. In special relativity the coordinate speed of light is only guaranteed to be c in an inertial frame; in a non-inertial frame the coordinate speed may be different from c. OPERA’s calibration error dashed those hopes, but there are still plenty of potential loopholes to be explored, such as the Star Trek-inspired warp drive mechanism first proposed by Mexican physicist Miguel Alcubierre in 1994. In general relativity, spacetime is dynamic, not static, warping and bending in response to the presence of mass or energy.
The stationary clock is already halfway to the next count, and the cyan light just started. From the perspective of the stationary observer, time is running slower for the moving clock. Oh, if you are in the moving ship time still seems normal. It’s just viewed from a different reference frame that time seems slower. In reality, though, the redshift is due to the expansion of space, not to the galaxy speeding away from you faster and faster.