I am not sure what to make of this, but it is interesting.
http://www.huffingtonpost.com/2014/09/03/grandfather-paradox-resolved-simulation_n_5758148.html?ir=Science

Steve

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Warning, addicted to SETI crunching!
Crunching as a member of GPU Users Group.
GPUUG Website

Just pie in the sky if you ask me. Wouldn't it be something tho that something like this isn't just a mere hypothesis anymore? Very interesting read, thanx Steve:)

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rOZZ
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If time travel is possible Its would need travel at greater than light speed, but the energy to achieve that would be greater than we have this is what I would think is the problem with possible time travel. we also know that no one has made them selves know to us that have come back in time

In the article, there is no need for faster than light travel, and they have only theorized about it at the photon level. I am quite skeptical, but am willing to look at evidence whether it agrees with my current understanding or not.

After learning that something actually lived on the surface of the space station for some time, caused me to re-think my position on life traveling on comets or asteroids, instead of just the building blocks. I still think it is more likely the building blocks could be transported over millions of years, rather than life itself, but now I think there might be a possibility that some form of life could survive millions of years in a space environment.

As to time travel, the math is working at a very small scale, but like M-theory, nothing experimental has been done to confirm it.

Steve

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Warning, addicted to SETI crunching!
Crunching as a member of GPU Users Group.
GPUUG Website

My Late Mom would have Loved this thread...She Loved the thought of Time Travel. 8o)

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I Desire Peace and Justice, Jim Scott (Mod-Ret.)

Yes life on earth would seem unlikely to be the only life to evolve, in such a massive universe we have not gone far yet into the unknown maybe we will contact other life forms because we have hundreds on earth more must be out there, but the size of space is to far to travel for us at the moment it would take generations of family's to reach nearest star after our sun

I understand your skepticism, and I share it.
Here is the embedded link explaining a little bit.
http://www.nature.com/ncomms/2014/140619/ncomms5145/full/ncomms5145.html

Nature Communications owns Scientific American, so this is a bit more reputable source.

All they did is use current knowledge of quantum mechanics to work some equations.
Mathematical evidence is certainly not conclusive, but it is more than there was. I personally don't think we will ever have a mechanism to travel back in time, even for an elementary particle, but I will look at evidence. If they can back it up with experimental proof, then I would be more open to the idea, once I understand the mechanism. Without experimental proof, it is just numbers.

Steve

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Warning, addicted to SETI crunching!
Crunching as a member of GPU Users Group.
GPUUG Website

The killer is always the energy required to achieve the field required to actually travel backward through time. There are probably many things that are doable on paper or in a thought experiment but are for all intents and purposes impossible.

I think Stephen Hawking's dinner party was a clever way to demonstrate that backward time travel will remain beyond man's capability for a long time to come.

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Bob DeWoody

My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events.

I think Stephen Hawking's dinner party was a clever way to demonstrate that backward time travel will remain beyond man's capability for a long time to come.

+1

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rOZZ
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I think Stephen Hawking's dinner party was a clever way to demonstrate that backward time travel will remain beyond man's capability for a long time to come.

Hawking wasn't the first one to pull such a stunt either. Back in 2005, some students at the Massachusetts Institute of Technology held a Time Traveler Conference, inviting all future time travelers to a specific location at a specific time and date to prove if time travel will ever be possible. No one from the future showed up.


In a separate discussion about this with a respected co-worker, he argued that he believes time travel will be possible, but one won't be able to travel back further than when time travel is invented, as each Time Traveler will need a device or receptacle to arrive in, and you can't arrive in it if the receptacle isn't invented.


I personally lean toward the idea that it will never be possible if only because the concept of time as a dimension hasn't been experimentally proven, which is why scientists refer to it as spacetime.

Time travel IS possible - but only if you want to go to the future and not come back, says Professor Brian Cox


Professor Cox made the claims at the British Science Festival
He explained time travel has already taken place, but on a very small scale
The closer someone travels to the speed of light, the more time slows
If time slows to a significant amount it could transport that person 'thousands of years into the future'

http://www.dailymail.co.uk/sciencetech/article-2420239/Professor-Brian-Cox-time-travel-IS-possible--want-to-future.html

Link is a year old.

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It seems that he has it somewhat backwards. Astronauts are perhaps a few seconds younger. Therefore you could say that they traveled to the future. If they went off to space at an appreciable percent of the speed of light then when they returned everyone would have aged far more than the space travelers.

i say that they could come back just as our astronauts and pilots do now.

Time travel in the forward direction is possible and most likely inevitable for long distance high speed space travellers. But I doubt that anyone will ever invent a machine that you can step into, push a button, and seconds later step out into a different time, either forward or backward.

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Bob DeWoody

My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events.

Time travel in the forward direction is possible and most likely inevitable for long distance high speed space travellers. But I doubt that anyone will ever invent a machine that you can step into, push a button, and seconds later step out into a different time, either forward or backward.

I totally agree!

Steve

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Warning, addicted to SETI crunching!
Crunching as a member of GPU Users Group.
GPUUG Website

People your forgetting the "Doctor" Who! ..

As Professor Cox and others have said you wont be able to travel back beyound the time you switched the machine on ....

The Grandfather Paradox ?!!

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I personally lean toward the idea that it will never be possible if only because the concept of time as a dimension hasn't been experimentally proven, which is why scientists refer to it as spacetime.

Time isn't a dimension, it is a measure of an elapse between two events. There is no such thing as spacetime, there is space and there is time.

Errrm, so now Einstein was wrong as well?


http://en.wikipedia.org/wiki/Spacetime

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rOZZ
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I did not say that Einstein was wrong. I said that I consider time not to be a dimension as such.

The spacetime interval between two events in Minkowski space is either space-like, light-like ('null') or time-like.

The term spacetime has been invented to encompass Einsteins theories. I also believe that if Einstein was alive to day with the current knowledge of Physics and Science, I think he would modify his theories. But we will never know will we.

It's not because of your consideration, Einstein would be wrong imo

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rOZZ
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Einstein was a genius that deserved 5 Nobel prizes but got only one, never for relativity. His Einstein-Podolsky-Rosen paradox has opened new horizons to physics, which are still unexplored.
Tullio

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I have read the scientific biography written by Abraham Pais ("Subtle is the Lord") but also on a more popular level "Albert Einsten creator and rebel" by Banesh Hoffman and Helen Dukas, the former secretary. Also I had the opportunity of knowing a former coworker of Einstein, prof. Peter G. Bergmann of Syracuse University, whose book "The riddle of gravitation" I published while at Mondadori Publishing House. Einstein's work is carried on by people such as Bruce Allen at the Albert Einstein Institute for Gravitational Physics in Hannover, who conducts two BOINC projects, Einstein@home and Albert@home, in which I take part.
Tullio

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Time isn't a dimension, it is a measure of an elapse between two events. There is no such thing as spacetime, there is space and there is time.

I used to think the same thing but as I developed a better understanding of relativity I saw that space and time are different but inextricably linked.

Consider this: as you travel faster through space, you travel slower through time. As you travel as fast as possible through space, c, you stop moving through time.

That is very much like traveling at a constant speed in different directions. Lets say I can only travel in two directions, north and east, and I can only travel at 10 mph.

If i travel due north my speed north is 10 mph and to the east it is zero. If I travel due east my speed to the north is zero and to the east is 10 mph.

If you now say that north represents moving through space and east represents moving through time you get the same result as special relativity (broadly speaking). The more my velocity points to the north (ie the faster my speed through space), the less of a component it has to the east (through time).

In a funny way you might say when we are at rest we are traveling through time at the speed of light. I don't know if that is very meaningful but I think it's interesting.