/sci/ - Science & Math

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Twin paradox in a torus universe

Anonymous Mon 21 Feb 10:38:27 2022 No.14252300 View Reply Original Report

Quoted By:

The solution to the twin paradox that is usually given is that the twin traveling away from the earth is not in an intertial frame of refrence since he has to accelerate when returning back to the earth, but what if he doesn't.
What would happen if the topology of the universe were that of $\mathbb{T^3}$ or even of $\mathbb{S^3}$ ? You could then follow a geodesic trajectory throught spacetime and still return to earth without having undergone any acceleration.
>Inb4 expanding universe
This entire argument is theoretical since I don't actually belive the universe is a 3-torus.

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Anonymous

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Anonymous Tue 22 Feb 2022 19:24:58 No.14256513 Report

Quoted By:

>>14255522
This is basically the answer, but the non-trivial thing is that it seems to assume a preferred reference frame. This is not wrong, there is a preferred reference frame in a toroidal universe: This is the frame in which you can shine laser beams in opposite directions, and the light from these comes back (around the torus) at the same time.

I wished I came up with this answer, but I heard it in a lecture of a professor that's really into GR. Sharing the love here.

Anonymous

Anonymous Tue 22 Feb 2022 19:30:26 No.14256535 Report

Quoted By: >>14256572

>>14256365
Yeah thats called perfect symmetry
>>14256358
>Then write out the Lorentz transformation on the torus that swaps them.
Im talking about spacetime not OPs hypothetical. PS. try elaborating your math instead of just copy-pasting wikipedia, faggot. Why don't you do all of the work to prove yourself right eh? Yeah, ill wait.

Anonymous

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Anonymous Tue 22 Feb 2022 19:41:08 No.14256572 Report

Quoted By:

>>14256535
>PS. try elaborating your math instead of just copy-pasting wikipedia, faggot.
>bro just spend half an hour copying and pasting the proof of the identity from a relativity textbook adapted to the Torus
What on earth would either of us win from that?

Anonymous

Anonymous Wed 23 Feb 2022 05:25:25 No.14257807 Report

Quoted By:

>>14255763
The pedagogy teaching relativity through Lorentz transformations is terrible in my opinion, and leads to a lot of the confusion. Proper time is something that is independent of which frame you are in so don't worry about Lorentz transformations or preferred frames.

If you do have an inertial frame and Dt is the time interval and Dx is the distance traveled then the square root of Dt^2-Dx^2 is the proper time and this doesn't depend on the frame. Even if you aren't in an inertial frame you can find the proper time consistently although the formula will be different.

Anonymous

Anonymous Wed 23 Feb 2022 05:31:30 No.14257817 Report

Quoted By:

>>14255763
Good point, but the proper time is something that is independent of frame so even if it were consistent to define a Lorentz transformation on a torus (I think it messes up at the boundaries) it is much easier to understand it this way thinking about propertime in a spacetime approach.

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Going back to school

Anonymous Tue 22 Feb 07:59:39 2022 No.14255162 View Reply Original Report

Quoted By: >>14257725

30+ years old with the gi bill going back to school to study aerospace engineering. is that a good idea? How fuxxed am I? Im hoping to get a job at space x or something

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Anonymous

Anonymous Wed 23 Feb 2022 04:34:29 No.14257725 Report

Quoted By:

>>14255162
Probably will be harder for you to memorize things. Write alot of notes by hand, and just be chill with your peers.

Anonymous

Anonymous Wed 23 Feb 2022 04:42:34 No.14257740 Report

Quoted By:

You don’t want to work at space x.

They are under payed and over worked just for the privilege of saying you work in space.

Anonymous

Anonymous Wed 23 Feb 2022 04:43:31 No.14257743 Report

Quoted By: >>14257750 >>14257759

>fucked
You have the gi bill, you can coast for the rest of your life and you'll still get all the free fast food you want come veterans day. Oh aerospace? Sounds like a good career field to me. With what I assume would already be a valid TS you could apply for something in private military industry and coast on six figures if you do good.

Anonymous

Anonymous Wed 23 Feb 2022 04:46:45 No.14257750 Report

Quoted By:

>>14257743
hello mr recrooooter
Also show your negro hands nigger

Anonymous

Anonymous Wed 23 Feb 2022 04:51:44 No.14257759 Report

Quoted By:

>>14257743
Yeah, most aerospace contractors give some degree of hiring preference to veterans, and having an active TS clearance is usually highly valued.

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Anonymous Tue 22 Feb 09:05:43 2022 No.14255217 View Reply Original Report

Quoted By: >>14257163 >>14257376 >>14257416 >>14257717

How to eliminate a synapse?

5 posts omitted

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Anonymous Wed 23 Feb 02:50:41 2022 No.14257557 View Reply Original Report

Quoted By: >>14257615 >>14257616 >>14257683 >>14257691 >>14257694

If autism is an"extreme male brain" then what is an extreme female brain?

7 posts omitted

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Anonymous Wed 23 Feb 01:25:36 2022 No.14257411 View Reply Original Report

Quoted By: >>14257455

Scientifically, why do autists do this? Really reminds me of chimps, perhaps this is something we used to do before complex society developed

1 post omitted

Anonymous

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Anonymous Wed 23 Feb 2022 01:33:59 No.14257429 Report

Quoted By: >>14257455

>>14257425
Hunching and keep their hands close to each other, staring downwards

Anonymous

Anonymous Wed 23 Feb 2022 01:54:49 No.14257455 Report

Quoted By: >>14257465

>>14257411
Link the paper first
>Scientifically, why do autists do this?
See, this is what always bothered me. Some guy gets diagnosed with X, does funny thing and now everyone thinks that all guys with X do that funny thing.
>>14257429
It's clearly a defense mechanism. He's either subconsciously anticipating an attack or gone into defense mode due to fear.

Anonymous

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Anonymous Wed 23 Feb 2022 02:00:19 No.14257465 Report

Quoted By: >>14257478

>>14257455
Personal eye witness to every kid in the "special" doing this

Anonymous

Anonymous Wed 23 Feb 2022 02:05:20 No.14257478 Report

Quoted By: >>14257629

>>14257465
>Personal eye witness to every kid in the "special" doing this
Which is all just "autism" now?
There's no deafness, intellectual disability, emotional dysregulation, multiple disabilities, down's etc.?

Anonymous

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Anonymous Wed 23 Feb 2022 03:27:53 No.14257629 Report

Quoted By:

>>14257478
Dude I'm mexican. You think they care? They were (and still are) dumped in the same corner so that the ((((orientator))) doesn't have to do his job and actually """orientate"""

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Anonymous Tue 22 Feb 08:48:33 2022 No.14255197 View Reply Original Report

Quoted By: >>14257335 >>14257363 >>14257459

The Only Way To Win This Is If We All Get Vaccinated As Required

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Anonymous

Anonymous Wed 23 Feb 2022 00:28:16 No.14257335 Report

Quoted By:

>>14255197
No one cares about that anymore, ww3 is on the menu

Anonymous

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Anonymous Wed 23 Feb 2022 00:55:14 No.14257363 Report

Quoted By:

>>14255197
>The Only Way To Win This Is If We All Get Vaccinated As Required

Anonymous

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Anonymous Wed 23 Feb 2022 00:56:55 No.14257365 Report

Quoted By:

>>14256995
>stand against our freedoms and see what happens

Anonymous

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Anonymous Wed 23 Feb 2022 01:57:43 No.14257459 Report

Quoted By:

>>14255197

Anonymous

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Anonymous Wed 23 Feb 2022 02:40:24 No.14257536 Report

Quoted By:

>>14255672
>Why You Dont Get Vaccinated?
Ennngrish?

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Anonymous Tue 22 Feb 23:54:17 2022 No.14257258 View Reply Original Report

Quoted By:

So what do you think about nonlocality?

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Anonymous Tue 22 Feb 07:56:07 2022 No.14255157 View Reply Original Report

Quoted By: >>14255239 >>14255449 >>14255455 >>14256500 >>14257453

>graduated with a BS in Biochemistry
>feel like a retard who doesn’t actually know anything
>too afraid to apply for jobs because I’ll be outed as a fraud
How do I cope?

6 posts omitted

Anonymous

Anonymous Tue 22 Feb 2022 09:19:34 No.14255239 Report

Quoted By:

>>14255157
>gets a bullshit in biochemistry
>surprised he doesn't know anything

Anonymous

Anonymous Tue 22 Feb 2022 12:23:24 No.14255449 Report

Quoted By:

>>14255157
I'll tell you a little secret. Most degrees are just a certificate that you can learn shit at a decent speed. You're not expected to actually remember everything you supposedly learned. But you are expected to learn whatever you need to do do your job fairly quickly.

Anonymous

Anonymous Tue 22 Feb 2022 12:26:56 No.14255455 Report

Quoted By:

>>14255157
learn to code bro, program some shitty apps on the command of a 60 year old divorced boomer with angina

Anonymous

Anonymous Tue 22 Feb 2022 19:21:16 No.14256500 Report

Quoted By:

>>14255157
Just know most jobs will train you in whatever they want you to do and really dont expect you to know what the fuck you are doing outside of the interview where they just check you are familiar with the formulas you memorized so they can know you aren't completely retarded and have the ability to learn things.

Anonymous

Anonymous Wed 23 Feb 2022 01:53:34 No.14257453 Report

Quoted By:

>>14255157
Lots of people are retards and they can jobs. Apply for some jobs. Prepare for resume and for interviews. You'll do fine.

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Anonymous Tue 22 Feb 10:29:06 2022 No.14255300 View Reply Original Report

Quoted By: >>14257332

So this is the power of evolutionary science

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Anonymous

Anonymous Wed 23 Feb 2022 00:26:32 No.14257332 Report

Quoted By:

>>14255300

This is just The Algorithm having a sense of humor.

Anonymous

Anonymous Wed 23 Feb 2022 00:28:52 No.14257337 Report

Quoted By: >>14257348

>>14257319
>That shit doesn't explain shit
https://www.artscroll.com/Books/9780899063621.html

Anonymous

Anonymous Wed 23 Feb 2022 00:40:45 No.14257348 Report

Quoted By: >>14257433

>>14257337
I'm a professional linguist, I can read that shit in hebrew, retard, it doesn't answer the main question the science doesn't answer either, but mostly because cosmology is fucked up by Vatican intervention.
The main answer is "Where did EVERYTHING come from?" (including you Good Old Daddy)

Anonymous

Anonymous Wed 23 Feb 2022 01:40:51 No.14257433 Report

Quoted By: >>14257447

>>14257348
I guess you will need to find out the Socrates way, go ask some people

Anonymous

Anonymous Wed 23 Feb 2022 01:51:42 No.14257447 Report

Quoted By:

>>14257433
That hobo pederast murdered philosophy with his dialectic babble, so that all the true philosophers preferred to call themselves scientists since then.

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Anonymous Mon 21 Feb 22:06:25 2022 No.14254058 View Reply Original Report

Quoted By: >>14254932 >>14256097 >>14257378

Is physiognomy real?

3 posts omitted

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Twin paradox in a torus universe

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