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From: Fritz Griffith <fritzgriffith.domain.name.hidden>

Date: Fri, 18 Feb 2000 21:16:14 MST

I've been considering time travel in the context of quantum mechanics and

parallel universes, and have come up with some thoughts and ideas about the

subject. This might be a little off-topic, but it does have to do with the

theory of parallel universes, which seems to be a large part of the

discussion on this newsgroup. I'm interested to know what you think of my

thoughts/ideas.

Most scientists agree that time travel is theoretically possible. Although

the task seems monumentous, many scientists also agree that it will

eventually be possible. Using MW theory, the paradoxes are resolved. Here

are some of my observations/ideas/theories behind quantum time travel.

I know from some of the research I did (and some reasonable assumptions)

that travelling back in time would put you back to the branch in which you

set your "time machine" to travel back to, and from there you would branch

into a universe in which you suddenly appear from the future. From there,

probability would remain as you expect it to using the SE, but since things

are initially different in this branch (you are there), things would turn

out differently in that universe than in one in which you didn't appear.

But how exactly is probability affected during time travel? I assume one of

two possibilities:

1. Travelling back in time actually affects the probability of the people

from that time suddenly seeing you appear from the future. So, if normally

the probability of you appearing would be nil, then because in the future

you decided to travel back to that time, you actually made their probability

of seeing you appear significant. Perhaps those people actually have a

50/50 chance of seeing you appear. Those who end up in the universe in

which you didn't appear would eventually end up at the point in which you

decide to go back in time. Those who end up in the universe in which you

did appear would probably follow an entirely different path.

2. Travelling back in time does not affect the probability of the people

from that time suddenly seeing you appear from the future. The only way

they would see you appearing is if molecules from their universe suddenly,

by pure chance, arranged themselves to create you. Of course, you know that

this universe was very likely to be YOUR universe, but at the same time you

know that everyone else you see in it is in a universe that they had an

absolutely nil chance of being in. They are justified in claiming that you

appearing in their universe was an absolute miracle and fluke of nature,

while at the same time you are justified in claiming that this universe was

very likely for you, and was not a miracle or a fluke of nature at all. In

other words, by time travelling you have managed to put yourself with

virtual certainty into a virtually impossible universe. If this was the

case, then for us to see beings from the future visiting us would be no more

special, and in fact no different, than me suddenly appearing on the moon by

pure chance. This would give an answer to Stephen Hawking's argument

against time travel, which was that if time travel were possible, we should

be seeing visitors from the future.

If proposition #1 was true, there would have to be some sort of relationship

between the measure of a certain universe and the probability of seeing

visitors that went back in time from that universe, otherwise we'd see

visitors from every possible future universe that sent visitors back in

time, and we'd constantly be seeing an infinite number of visitors coming

from the future. It is most reasonable to assume that we will see visitors

from a likely future universe, so the relationship would probably be the

greater the measure of a future universe, the more likely we are to see

visitors from that universe.

This brings me to one potential downfall of proposition #1. Let us suppose

this scenario: we continue through time (without any visitors from the

future) and eventually achieve the ability to time travel. We travel back

to a certain point in our past, not once, but many, many hundreds of

millions of times. Because travelling back in time changes the probability

of what happened, then because we travelled back in time hundreds of

millions of times, the probability that the people from that time won't see

visitors from the future is very, very small. The chance of not seeing

visitors from the future becomes insignificant compared to the probability

of seeing visitors from the future. Because it is so insignificant, it is

unlikely that the people will see visitors from that universe due to the

relationship I mentioned earlier. But if we are unlikely to see visitors

from the future, then the original universe becomes very likely again. So,

we have a paradox. For this reason I believe that proposition #1 is

impossible.

This leaves proposition #2, which is not very attractive to people who

believe we are being visited by beings from the future, or people who dream

of one day being visited. However, just in case I have erred in my logic of

proving proposition #1 wrong, I have come up with some interesting

possibilities that proposition #1 provides, besides a paradox. Below I

present a way in which to test, right now, whether time travel - and,

specifically, proposition #1, exists.

The experiment is simple: organize an international decree that when we

discover time travel, we should travel back to this very day, month, and

year. The hope is that when we do discover time travel, we will go back to

the year 2000 because of the decree, and show everyone in this time that

time travel is indeed possible, and hopefully even give these people

advanced technology. If part of the decree is that we go back many, many

times, then the chance the people from this time don't see any visitors from

the future is very small (we are pretending that the original universe is

still signinficant). In other words, by simply issuing a decree right now,

we can possibly discover whether time travel is possible, right now. Of

course, proposition #1 would have to be correct, and even if it was, there

are plenty of reasons that our future selves wouldn't visit us. They might

not do it for moral or economic reasons, or they might have forgotten or

just don't care about the decree anymore. Or, time travel might be

theoretically possible, but not practical in any way. A disaster might have

even befallen our descendants, wiping them out before they could develop

time travel. However, all of these potential problems aside, I believe that

if proposition #1 was a possibility, then by issuing this decree we would be

siginificantly increasing the chances of seeing visitors from the future

right now. Of course, the sooner we do the experiment, the more likely it

is that we won't see visitors from the future, because there is more time

for something to go wrong before we develop time travel technology.

______________________________________________________

Get Your Private, Free Email at http://www.hotmail.com

Received on Fri Feb 18 2000 - 20:24:26 PST

Date: Fri, 18 Feb 2000 21:16:14 MST

I've been considering time travel in the context of quantum mechanics and

parallel universes, and have come up with some thoughts and ideas about the

subject. This might be a little off-topic, but it does have to do with the

theory of parallel universes, which seems to be a large part of the

discussion on this newsgroup. I'm interested to know what you think of my

thoughts/ideas.

Most scientists agree that time travel is theoretically possible. Although

the task seems monumentous, many scientists also agree that it will

eventually be possible. Using MW theory, the paradoxes are resolved. Here

are some of my observations/ideas/theories behind quantum time travel.

I know from some of the research I did (and some reasonable assumptions)

that travelling back in time would put you back to the branch in which you

set your "time machine" to travel back to, and from there you would branch

into a universe in which you suddenly appear from the future. From there,

probability would remain as you expect it to using the SE, but since things

are initially different in this branch (you are there), things would turn

out differently in that universe than in one in which you didn't appear.

But how exactly is probability affected during time travel? I assume one of

two possibilities:

1. Travelling back in time actually affects the probability of the people

from that time suddenly seeing you appear from the future. So, if normally

the probability of you appearing would be nil, then because in the future

you decided to travel back to that time, you actually made their probability

of seeing you appear significant. Perhaps those people actually have a

50/50 chance of seeing you appear. Those who end up in the universe in

which you didn't appear would eventually end up at the point in which you

decide to go back in time. Those who end up in the universe in which you

did appear would probably follow an entirely different path.

2. Travelling back in time does not affect the probability of the people

from that time suddenly seeing you appear from the future. The only way

they would see you appearing is if molecules from their universe suddenly,

by pure chance, arranged themselves to create you. Of course, you know that

this universe was very likely to be YOUR universe, but at the same time you

know that everyone else you see in it is in a universe that they had an

absolutely nil chance of being in. They are justified in claiming that you

appearing in their universe was an absolute miracle and fluke of nature,

while at the same time you are justified in claiming that this universe was

very likely for you, and was not a miracle or a fluke of nature at all. In

other words, by time travelling you have managed to put yourself with

virtual certainty into a virtually impossible universe. If this was the

case, then for us to see beings from the future visiting us would be no more

special, and in fact no different, than me suddenly appearing on the moon by

pure chance. This would give an answer to Stephen Hawking's argument

against time travel, which was that if time travel were possible, we should

be seeing visitors from the future.

If proposition #1 was true, there would have to be some sort of relationship

between the measure of a certain universe and the probability of seeing

visitors that went back in time from that universe, otherwise we'd see

visitors from every possible future universe that sent visitors back in

time, and we'd constantly be seeing an infinite number of visitors coming

from the future. It is most reasonable to assume that we will see visitors

from a likely future universe, so the relationship would probably be the

greater the measure of a future universe, the more likely we are to see

visitors from that universe.

This brings me to one potential downfall of proposition #1. Let us suppose

this scenario: we continue through time (without any visitors from the

future) and eventually achieve the ability to time travel. We travel back

to a certain point in our past, not once, but many, many hundreds of

millions of times. Because travelling back in time changes the probability

of what happened, then because we travelled back in time hundreds of

millions of times, the probability that the people from that time won't see

visitors from the future is very, very small. The chance of not seeing

visitors from the future becomes insignificant compared to the probability

of seeing visitors from the future. Because it is so insignificant, it is

unlikely that the people will see visitors from that universe due to the

relationship I mentioned earlier. But if we are unlikely to see visitors

from the future, then the original universe becomes very likely again. So,

we have a paradox. For this reason I believe that proposition #1 is

impossible.

This leaves proposition #2, which is not very attractive to people who

believe we are being visited by beings from the future, or people who dream

of one day being visited. However, just in case I have erred in my logic of

proving proposition #1 wrong, I have come up with some interesting

possibilities that proposition #1 provides, besides a paradox. Below I

present a way in which to test, right now, whether time travel - and,

specifically, proposition #1, exists.

The experiment is simple: organize an international decree that when we

discover time travel, we should travel back to this very day, month, and

year. The hope is that when we do discover time travel, we will go back to

the year 2000 because of the decree, and show everyone in this time that

time travel is indeed possible, and hopefully even give these people

advanced technology. If part of the decree is that we go back many, many

times, then the chance the people from this time don't see any visitors from

the future is very small (we are pretending that the original universe is

still signinficant). In other words, by simply issuing a decree right now,

we can possibly discover whether time travel is possible, right now. Of

course, proposition #1 would have to be correct, and even if it was, there

are plenty of reasons that our future selves wouldn't visit us. They might

not do it for moral or economic reasons, or they might have forgotten or

just don't care about the decree anymore. Or, time travel might be

theoretically possible, but not practical in any way. A disaster might have

even befallen our descendants, wiping them out before they could develop

time travel. However, all of these potential problems aside, I believe that

if proposition #1 was a possibility, then by issuing this decree we would be

siginificantly increasing the chances of seeing visitors from the future

right now. Of course, the sooner we do the experiment, the more likely it

is that we won't see visitors from the future, because there is more time

for something to go wrong before we develop time travel technology.

______________________________________________________

Get Your Private, Free Email at http://www.hotmail.com

Received on Fri Feb 18 2000 - 20:24:26 PST

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