Time Travel Cases that are recorded

Well we can all dream in the meantime cant we? Or do we have to wait for proof? Or need the scientific communities approval to even have a thought not based on appropriate evidence?
 
birch said:
Well we can all dream in the meantime cant we? Or do we have to wait for proof? Or need the scientific communities approval to even have a thought not based on appropriate evidence?
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Yes, the scientific community is policing our dreams. But not you. You rebel! :rolleyes:
 
From Paddoboy Post #8
. . . . . time travel is certainly not forbidden by the laws of physics and GR, but as yet, we are nowhere near clever enough to achieve it . . . . .
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Perhaps some form of time travel is not forbidden by the laws of physics. The possibility of various types of paradoxes surely seem to preclude the SciFi versions of time travel. Example:

Go back in time & murder your mother before you were born or in some other manner prevent her meeting & marrying your father.​

I do not expect the typical SciFi version of time travel to ever be possible.
 
The paradox I described in Post #23 is a strong argument against the possibility of the SciFi variety of Time Travel.

Paradoxes & singularities are strong evidence against the validity of almost any proposed phenomenon.
 
Dinosaur said:
Paradoxes & singularities are strong evidence against the validity of almost any proposed phenomenon.
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What???? Please explain how singularities are strong evidence against anything? I think supernovae and frogs are equally strong evidence. :p
 
Dinosaur said:
The paradox I described in Post #23 is a strong argument against the possibility of the SciFi variety of Time Travel.
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The fact that we can't make sense of it (even though it's something we've never experienced anyway) isn't really a good argument against it.

It would be like Homo Erectus saying "the fact that airplanes are heavier than air is a strong argument against a working airplane."
 
birch said:
Well we can all dream in the meantime cant we? Or do we have to wait for proof? Or need the scientific communities approval to even have a thought not based on appropriate evidence?
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Dream - YES

Wait for proof - NO

Need the scientific communities approval... - NO

:)
 
From Paddoboy Post #8
And yes, time travel is certainly not forbidden by the laws of physics and GR, but as yet, we are nowhere near clever enough to achieve it.
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Certain types of time travel lead to paradoxes, which seem to me rule against such time travel.

As mentioned in a previous Post of mine: Consider going back in time & murdering one of your parents or otherwise preventing your birth.

From Oystein Post #26
Please explain how singularities are strong evidence against anything?
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Consider the following from http://www.physlink.com/Education/AskExperts/ae251.cfm
When a physicist refers to a singularity he or she is generally referring to a quantity which is infinite. Specifically, a quantity which approaches infinity as another parameter goes to zero, such as 1/x as x approaches zero. . . . . . . In short then, a singularity represents an infinity and we generally don't think nature is infinite. The problem arises from not having some kind of 'floor' built into a theory that keeps you from taking the limit of 1/x as x goes to zero. The way out is to apply a new theory that has such a floor, such as quantum mechanics or string theory (quantum gravity).
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Above due to Brent Nelson, M.A. Physics, Ph.D. Student, UC Berkeley.
 
Dinosaur said:
Certain types of time travel lead to paradoxes, which seem to me rule against such time travel.
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From my understanding of time which I think my post in this thread or another thread is

TIME does not exist
Only NOW exist
The PAST does not exist
The FUTURE does not exist

To TRAVEL to another TIME is impossible because there is no OTHER TIME destination

:)
 
DaveC426913 said:
The fact that we can't make sense of it (even though it's something we've never experienced anyway) isn't really a good argument against it.

It would be like Homo Erectus saying "the fact that airplanes are heavier than air is a strong argument against a working airplane."
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Agree . . . . "Absence of evidence is NOT evidence of absence" . . . . .(Wiki)
 
I need to clarify.

Dinosaur and I were talking about whether it is ever going to be possible. Not about whether time travel is being observed now.

So, restating my point: The fact that it is a mystery to us does not really lend credence to the idea that it can't occur in the universe.
 
DaveC426913 said:
I need to clarify.

Dinosaur and I were talking about whether it is ever going to be possible. Not about whether time travel is being observed now.

So, restating my point: The fact that it is a mystery to us does not really lend credence to the idea that it can't occur in the universe.
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To restate like a cracked record

My understanding in regards to Time travel

TIME does not exist
Only NOWexist
The PAST does not exist
The FUTURE does not exist

To TRAVEL to another TIME is impossible because there is no OTHER TIME destination

But I must admit this would hold only if the laws of physics are the same throughout the Universe

Pssst I think they are

:)
 
ScFi versions of time travel ignore the issue of the traveler's spatial location after traveling in time.

Say a person traveled 5 years backwards in time. How much has the solar system traveled in 5 years?

It seems to me that the solar system has traveled a significant distance in that time.

If the traveler maintained his current position, I expect that he would be far from the solar system & likely to be in empty space rather than on some planet.
 
Dinosaur said:
ScFi versions of time travel ignore the issue of the traveler's spatial location after traveling in time.

Say a person traveled 5 years backwards in time. How much has the solar system traveled in 5 years?

It seems to me that the solar system has traveled a significant distance in that time.

If the traveler maintained his current position, I expect that he would be far from the solar system & likely to be in empty space rather than on some planet.
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IMO, that may be why we have such difficulty in observing 'time travelers'. Something about 'windage', I think. Guess those temporal explorers need to do more research on positional dynamics? (<---all of this is intended as humor HAHA!)
 
Dinosaur said:
ScFi versions of time travel ignore the issue of the traveler's spatial location after traveling in time.

Say a person traveled 5 years backwards in time. How much has the solar system traveled in 5 years?

It seems to me that the solar system has traveled a significant distance in that time.

If the traveler maintained his current position, I expect that he would be far from the solar system & likely to be in empty space rather than on some planet.
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In a sense that fits in with my understanding of TIME not existing in that the so called traveler (ether way) does not have a destination to travel to

The PAST does not exist
The FUTURE does not exist

:) The planets do not align :)

:)
 
Dinosaur said:
It seems to me that the solar system has traveled a significant distance in that time.
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Relative to what?

That's a problem with that line of refutation. It requires some sort of absolute frame of reference.
Which means it;s incompatible with relativity.

We'd have to consider what kind of time travel is compatible with relativity.
 
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