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Hawking service 'open to time travelers'

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Ozymandias

Time is not independent of space- we live in a space-time continuum. The arrow of time is uni-directional and the universe is expanding with it.

In my view, time-travel is not possible. We only exist in the here and now. One cannot travel forward into the future to a place and time that has never existed. Nor can one travel backwards to a time and place whose moment of existance was in the past, a particular point in the space-time continuum that no longer exists.

Time travel in our space-time dimensions is analogous to jumping out of one frame in a film reel and relocating yourself in another frame. Think about it.

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Black Monk

No invited time traveller turned up to his birthday party in 2009.

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seanjo
13 minutes ago, Ozymandias said:

Time is not independent of space- we live in a space-time continuum. The arrow of time is uni-directional and the universe is expanding with it.

In my view, time-travel is not possible. We only exist in the here and now. One cannot travel forward into the future to a place and time that has never existed. Nor can one travel backwards to a time and place whose moment of existance was in the past, a particular point in the space-time continuum that no longer exists.

Time travel in our space-time dimensions is analogous to jumping out of one frame in a film reel and relocating yourself in another frame. Think about it.

Time travel is possible but only forward i.e. time dilation the faster you travel.

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Black Monk
1 hour ago, seanjo said:

Time travel is possible but only forward i.e. time dilation the faster you travel.

How do you know time travelling to the past is impossible?

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seanjo
Posted (edited)
26 minutes ago, Black Monk said:

How do you know time travelling to the past is impossible?

I don't for sure, but I'm pretty certain.

 

I think there is room for it in Relativity theory, but it involves traveling faster than light which is impossible.

 

Here's an interesting piece, mentions wormholes...http://timetravelphilosophy.net/topics/relativity/

Edited by seanjo

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pallidin

Well, what happens if there is no immutable "forward arrow-in-time"?

After all, we exist, not in the past or future, but the concrete NOW.

Perhaps the past, present and future is rolled into one grand mystery.

 

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IBelieveWhatIWant
On 5/12/2018 at 8:22 PM, Ozymandias said:

Time is not independent of space- we live in a space-time continuum. The arrow of time is uni-directional and the universe is expanding with it.

In my view, time-travel is not possible. We only exist in the here and now. One cannot travel forward into the future to a place and time that has never existed. Nor can one travel backwards to a time and place whose moment of existance was in the past, a particular point in the space-time continuum that no longer exists.

Time travel in our space-time dimensions is analogous to jumping out of one frame in a film reel and relocating yourself in another frame. Think about it.

It's been mathematically proven that you can in fact travel forward in time. It's actually pretty much accepted that it possible now. Backwards is another question entirely though.

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Ozymandias
On 5/12/2018 at 11:36 AM, seanjo said:

Time travel is possible but only forward i.e. time dilation the faster you travel.

Time dilation is not time travel. It is merely a differential in how time is recorded based on a relative difference in velocity between two observers. 

The fastest any human has ever traveled - some of the Apollo mission astronauts - has been about 11 kilometres (7 miles) a second. The speed of light is 300,000 km/sec (186,000 miles/sec). We haven't even attained one ten thousandth of one percent of the speed of light. the formula for time dilation is;

t' =  t/[sq.rt.(1- v2/c2)] 

We have a long way to go before time dilation effects will ever effect us physically, and even then it will never effect the billions of people on planet earth.

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danydandan
17 minutes ago, IBelieveWhatIWant said:

It's been mathematically proven that you can in fact travel forward in time. It's actually pretty much accepted that it possible now. Backwards is another question entirely though.

 

5 minutes ago, Ozymandias said:

Time dilation is not time travel. It is merely a differential in how time is recorded based on a relative difference in velocity between two observers. 

The fastest any human has ever traveled - some of the Apollo mission astronauts - has been about 11 kilometres (7 miles) a second. The speed of light is 300,000 km/sec (186,000 miles/sec). We haven't even attained one ten thousandth of one percent of the speed of light. the formula for time dilation is;

t' =  t/[sq.rt.(1- v2/c2)] 

We have a long way to go before time dilation effects will ever effect us physically, and even then it will never effect the billions of people on planet earth.

Actually Frank Tiplers calculations does show time travel is possible theoretically.

Spacetine can be distorted by strong gravitational fields, and Tipler’s imaginary time machine is a very massive cylinder, containing as much matter as our sun packed into a volume 100km long and 10km in radius, as dense as the nucleus of an atom, rotating twice every millisecond and dragging the fabric of space-time around with it. The surface of the cylinder would be moving at half the speed of light. Basically you would need to use multisecond pulsar, we don't have then lying around in our back garden. So yes it's theoretically possible but practically impossible.

http://www.andersoninstitute.com/tipler-cylinder.html

https://www.google.com/url?q=http://theophysics.host56.com/pdf/tipler-rotating-cylinders.pdf&sa=U&ved=0ahUKEwjW7-aJ1YLbAhXMCsAKHcq7Dh4QFggWMAQ&usg=AOvVaw0jDK4Mf1mGYcteLgrc620k

The only issue is with a finite Tipler cylinder time machine there is no widely accepted proof that a finite Tipler cylinder spinning at any rate would be capable of time travel. There is also another problem. We also lack any experimental evidence of a spinning Tipler cylinder influencing time.

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seanjo
3 hours ago, Ozymandias said:

Time dilation is not time travel. It is merely a differential in how time is recorded based on a relative difference in velocity between two observers. 

The fastest any human has ever traveled - some of the Apollo mission astronauts - has been about 11 kilometres (7 miles) a second. The speed of light is 300,000 km/sec (186,000 miles/sec). We haven't even attained one ten thousandth of one percent of the speed of light. the formula for time dilation is;

t' =  t/[sq.rt.(1- v2/c2)] 

We have a long way to go before time dilation effects will ever effect us physically, and even then it will never effect the billions of people on planet earth.

It's the closest we'll ever get to time travel.

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Black Monk
17 hours ago, pallidin said:

Well, what happens if there is no immutable "forward arrow-in-time"?

After all, we exist, not in the past or future, but the concrete NOW.

Perhaps the past, present and future is rolled into one grand mystery.

 

Does the present even exist? The past and future do, but what about the present?

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