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Author Topic: Earth as a 1g spacecraft, and change of time perception with age.  (Read 4987 times)
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Earth as a 1g spacecraft, and change of time perception with age.
« on: January 20, 2013, 08:07:34 pm »

We humans continuously experience a gravitational pull of 1g towards the center of the earth. The gravitational pull we experience from earth is equal to the pull we would feel in a spaceship continuously accelerating 9.81 m/s2. A person born on such a spaceship would have traveled to the nearest star by the age of 4, traveled to the center of the galaxy by the age of 20, traveled to the Andromeda galaxy by the age of 28, and to the edge of the known universe by the age of 40. The person would be able to travel these astonishing distances in such short amounts of time because of relativistic time dilation on the spacecraft.

The earth isn't necessarily a spacecraft continuously accelerating at 1g, but our perception of time seems to change with age. As we grow older we feel that less time passes in a day than we did when we were younger. Is it possible that the change in time perception with age is related to the 1g gravitational field we continuously are exposed to?
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Alvarin
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Re: Earth as a 1g spacecraft, and change of time perception with age.
« Reply #1 on: January 21, 2013, 03:14:35 am »

With age there are fewer "new things" for the brain to register into memory, making the routine stuff just disappear from registered events, which feels like less time.
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Re: Earth as a 1g spacecraft, and change of time perception with age.
« Reply #2 on: January 21, 2013, 11:59:27 am »

I have a problem with understanding the relationship between time dilation in special relativity and general relativity. In special relativity time dilation is usually related to speed ( at light speed there is infinite time dilation ). In general relativity time dilation is usually related to gravity, but gravity is not equivalent to speed. Gravity is equivalent to acceleration. In special relativity time dilation increases with time in an accelerating trajectory. In general relativity time dilation does not seem to increase with time in a gravitational field.
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Death 999
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Re: Earth as a 1g spacecraft, and change of time perception with age.
« Reply #3 on: January 21, 2013, 04:39:07 pm »

Well, we certainly don't slow down more over time from the impeded acceleration from gravity.
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Re: Earth as a 1g spacecraft, and change of time perception with age.
« Reply #4 on: January 25, 2013, 09:48:21 pm »

As we grow older we feel that less time passes in a day than we did when we were younger. Is it possible that the change in time perception with age is related to the 1g gravitational field we continuously are exposed to?

I believe that you wouldn't notice a change in the length of your day, only outside observers of your accelerating frame see the effect.  I think also since the 1 g is constant, so would be the observers time dilation.

Anyone else think relativity is a bit of a load?  I always thought it only describes what we see (using electromagnetic waves), not what is.
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Re: Earth as a 1g spacecraft, and change of time perception with age.
« Reply #5 on: January 26, 2013, 10:39:44 pm »

No, it's legit. Stuff really actually slows down and thins out.

Imagine you've got a king's court. All these messengers zooming around at the speed of messengers (they always move the same speed). And the nobles position themselves around the king to get the right round-trip message passing times - close enough that they can respond to emergencies or summons, but not so close that the king can notice the things they're doing behind his back.

The king decides to take his court on a jog, and says business may continue. They're now all moving at a noticeable fraction of the speed of the messengers.

The pace of the court has to slow down because the messengers have to cover so much more ground. That's time dilation.
To keep up as well as they can, the nobles in front of and behind the king have to close in to minimize the extra distance the messengers have to go. That's space dilation.

There's no analogue for energy in this analogy, but that one you can notice is real just by calorimetry, so we don't need it.

It happens because of the messengers (light), but it's not simply a matter of perception.
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Re: Earth as a 1g spacecraft, and change of time perception with age.
« Reply #6 on: August 25, 2013, 10:43:47 pm »

Is it possible that the change in time perception with age is related to the 1g gravitational field we continuously are exposed to?
No, because the acceleration is effectively constant (minor changes for sea level vs mountains, but even those wouldn't effect localized perception of time passing).  Instead, the perceived change of pace of the passing of time as one ages is better explained by length of time compared to age:
If you're one year old, "one year" is a lifetime from your experience.  If you're two years old, half a life time.  Twenty years old, one twentieth, etc.  Then as Alvarin mentioned, you begin to forget common or routine actions, which seems to speed up the present days passing even more.
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Re: Earth as a 1g spacecraft, and change of time perception with age.
« Reply #7 on: August 30, 2013, 07:23:07 pm »

You're completely neglecting time dilation, you would never accelerate past the speed of light, and if you could you would view others time as either stopped or reversing and therefore would not measure age on Earth. From the perspective of someone on Earth time would be dilated for the observer such that they would view the luminal traveler's clock as stopped and thus the traveler would not age relative to any non-luminal frame of reference.
« Last Edit: September 02, 2013, 07:11:00 am by FakeMccoy » Logged
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Re: Earth as a 1g spacecraft, and change of time perception with age.
« Reply #8 on: September 06, 2013, 10:55:02 pm »

No, it's legit. Stuff really actually slows down and thins out.

Every time you see a sci-fi movie where you go near or past the speed of light, you see everything stretching out, but that's not what happens. What really happens is the relative metric of other objects appears smaller and objects contract as from your relative view they approach you at nearly the speed of light, so why do people make it so things stretch out in movies? Is it just some misconception?
« Last Edit: September 06, 2013, 10:57:14 pm by FakeMccoy » Logged
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Re: Earth as a 1g spacecraft, and change of time perception with age.
« Reply #9 on: September 08, 2013, 02:57:00 am »

Lightspeed technology doesn't actually exist. The sfx crew and the director can make it look like whatever they like. This is the miracle of fiction. Ceterum FakeMccoy excilia est.
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Re: Earth as a 1g spacecraft, and change of time perception with age.
« Reply #10 on: September 08, 2013, 03:52:04 am »

Lightspeed technology doesn't actually exist. The sfx crew and the director can make it look like whatever they like. This is the miracle of fiction. Ceterum FakeMccoy excilia est.
Yeah I really don't care that a director can make it look however they want, what matters is why they all make it look the same way because that signifies that there's a specific ignorance about relativity that's common. It's not a miracle of fiction, it's an emblem of misunderstanding.
« Last Edit: September 08, 2013, 08:38:59 am by FakeMccoy » Logged
Death 999
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Re: Earth as a 1g spacecraft, and change of time perception with age.
« Reply #11 on: September 09, 2013, 03:55:44 am »

No, it's legit. Stuff really actually slows down and thins out.

Every time you see a sci-fi movie where you go near or past the speed of light, you see everything stretching out, but that's not what happens. What really happens is the relative metric of other objects appears smaller and objects contract as from your relative view they approach you at nearly the speed of light, so why do people make it so things stretch out in movies? Is it just some misconception?

Just because it thins out doesn't mean that it looks like it thins out. You'd get severe motion blur, and that would look like stretching out.
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Re: Earth as a 1g spacecraft, and change of time perception with age.
« Reply #12 on: September 09, 2013, 05:22:16 am »

I suppose motion blue could account for some of it, but you'd still need to observe the metric of those objects shrinking and the stars light years in-front of you shouldn't be blurred that much. If you're ramming into light particles faster than they can even travel, it would severely limit how much they can pass you by to create a blur at all, they would not be able to reach you after a certain relative angle on the x-y plane relative to you because the path they would travel would be the hypotenuse of an auxiliary triangle that would require a length greater than the distance light could travel in one second, which you would have already surpassed. In fact, if you travel fast that light I'm not even sure how it would blue shift, somehow the frequency would be negative and surpassing it's approach to infinity as you got closer the the speed of light.
« Last Edit: September 09, 2013, 05:27:32 am by FakeMccoy » Logged
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Re: Earth as a 1g spacecraft, and change of time perception with age.
« Reply #13 on: September 09, 2013, 05:33:22 pm »

I was talking about near-lightspeed, not above-lightspeed. If you're going faster than light, we have no idea what to expect because our rules are clearly wrong.
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Re: Earth as a 1g spacecraft, and change of time perception with age.
« Reply #14 on: September 09, 2013, 11:34:54 pm »

For things passing you near light speed there could easily be some motion blur, but I was referring to tv and movies like Star Trek when they go to warp speed.
« Last Edit: September 10, 2013, 12:05:33 am by FakeMccoy » Logged
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