/sci/ - Science & Math

The universe could be infinite.

But yes, the energy *density* of the universe is going down as the universe expands.

3.62 joules per cubic metre of the universe by latest models/estimates

>>4700667
I think that's not right.
I think there's still an equal amount of energy in the universe, just less concentrated.

Yes, there is a fixed amount of energy.

The total amount cannot be known, but there are some indications that it is exactly zero.

>>4700667
The universe isn't infinite since it was finite at its beginning

>>4700673
That's what I said.

But I'm also telling you that if the universe is infinite, then so is the total energy.

>>4700683
Antimatter has positive energy.

>>4700684
So how can total energy be null ?

>>4700674
how can we be alive if the sum is 0

is there negative energy as well, just like there is anti-matter?

>>4700681
you said the energy was going down.

>implying there was less and less energy as time goes on

that's how I interpreted it.

>>4700687
he said energy density was going down you retard

>>4700687
No he said energy DENSITY was going down

>>4700683

Gravitational potential energy is negative. If the zero energy universe hypothesis is true, the mass energy of every particle is balanced out with the sum of gravitational potentials with every other mass in the universe.

This appears to be at least approximately true, and if it were exactly true it would resolve some questions about the origin of the universe.

>>4700680
>The universe isn't infinite since it was finite at its beginning

No. If it is infinite, it has always been infinite. That's entirely possible based on our current understanding.

I'm guessing you're thinking of the Big Bang as an explosion. Don't. Think of it as a time when the universe was extremely dense.

>>4700681
>>4700667
So the universe is expanding at a quicker rate, than energy is being formed?

Sorry. I don't see how energy can be infinite

>>4700683
>is there negative energy as well
Yes, in a sense gravity can be considered negative energy.

seriously, how can light travel through vacuum??

I mean, wtf.

>>4700666
>666

>>4700728
a vacuum is filled with energy
light also rides spacetime

>>4700703
You're confusing "infinite" and "unbounded".

>>4702134

http://dictionary.reference.com/browse/infinite?s=t

<span class="math">4. unbounded or unlimited; boundless; endless[/spoiler]

Fact: The universe is expanding.

If the universe was infinitate at the time of writing this line,
then it would be larger than infinity by the time i finished this line.

Conclusion: OP is a faggot

>>4700666
>energy can not be created nor destroyed.

Wrong.
Your notion of energy is pretty childish. Conservation of energy is a derived law, that only applies to certain types of systems.

>>4702203

Yeah, specifically closed systems, which in all likelihood the Universe is.

Don't be so pedantic, asshat.

>>4702203

EXAMPLES

>>4702203

>>4702212
Nope.

The only way a system conserves energy is if it is homogenous in time, it has nothing to do with the closure of the system.

A closed system with an in-homogenous time, still doesn't conserve energy. An open system with an homogenous time does conserve energy. Get it?

>>4702224
>An open system with an homogenous time does conserve energy.
Dude, just stop.

>>4702212
>assuming universe closed system
>making profoundly vast metaphysical assumptions
>answering a question that has been discussed inconclusively at least once every decade by all societies on Earth since the birth of language
>science

>>4702218
The FLRW metric which is used to model the expansion of space.

A Ton of shit in solid-state.

>>4702228
>can't into actual physics
>engineer detected

>>4702228
>scared of physics
>perfers magic

>>4702238

>engineer

i.e. somebody with a job.

>>4702242
>scared of magic
sure is 17th century in here

>>4702244
>implying sucking homeless men off is a proper job

>>4702244
>engineer

Someone who can't into science.

>>4702253
freshman detected.

>>4702185
see
>>4701598

>>4702252
This thread makes it painfully obvious that engineers know nothing of physics, math, or science.

>>4700666
Can we get an engineering thread going?

>>4702262

No, but they get paid well and they fuck all the bitches.

Keep your science.

>>4702264
Since when do gay men have sex with women?
Do you know what "gay" means?

>>4702268

>calls engineers gay

Says the life-long virgin

>>4702264
>admits that engineers fuck dogs

NICE

>>4702268
They do it for children, which they then kidnap to rape between them and their gay lover (if it's a boy). If it's a girl they just donate it to science.

>>4702271
I think you meant "anal virgin".

>>4702271
>implying I ain't fucking your mom right now

Just go into her room faggot! I dare you!
Maybe if your good I'll let you call me daddy!

>>4702161
Mathematically and physically they are not the same thing.

>mfw when double major in computer engineering and physics

So I'm a homosexual virgin?

This thread is completely filled with autism.

>>4702273
>engineering
>gay lovers
>sex with young boys

WHERE DO I SIGN UP!

>>4702284
So computer engineers are stupid and homosexual?

>>4702287

Yes, let the butthurt flow through you.

>>4702278
Nope. You are a swell dude. Your physics degree will make up for your engineering faggotry!

>>4702290
>engineer
>concerned with my butt

Why am I not suprised

>>4702295

That's it. Let it all out.

There is no energy in the universe whatsoever, nor has there ever been any. If there were energy in the universe, it would have to come from somewhere. But there is no "where" before the universe, since the universe contains all places. Thus, we can rationally deduce the universal principle of null energy.

Engineering = practical science for (despite the laughable misconception in this thread) awesome heterosexual people.

Physics and other theoretical nonsense = stupid shit for antisocial virgin introverts.

>>4700666
To answer your question OP.

The concept of energy is more complicated then you realize. Energy isn't always conserved. Energy conservation is not some "universal principle". Conservation of energy is applicable for only certain types of systems.

When talking about "Energy" at a universal scale, we don't yet know enough about the "system" to actually say if energy is conserved or not. In fact the current models we use to describe the universe of a large scale, don't have conservation of energy!

Anyother questions?

>>4702305
Engineering pride!

>>4702305
>engineers
>hetrosexual people

Have you never met an engineer?

>>4702313

Yeah ,keep saying that and it must be true.

>>4702313

Yes, total bad asses if you as me.

>>4702315
>trapped in the closet

It is ok guy! /sci/ will accept your homosexual lifestyle. There is no judgement here! Be honest with yourself, and you will feel alot better! Stop living a lie!

>>4702322
>call people gay
>save images of men kissing

>>4702323
>implying people with heterosexual pornography aren't gay

>>4702322

Your repressed homosexuality, rampant idiocy, and aspergers physically pains me.

>>4702320
>engineer

>must include a reference to male buttocks in every post

>keeps insisting he is straight

>>4702332
>>4702326

>>4702327
That is my engineering TA!
Best semester I ever had!

>>4702326

>>4702338
>>4702326

>>4702326

TAKE YOUR ENGINEERING BULLSHIT TO /cm/--->

>>4702341
>>4702326

>>4702340

>>4702344
>>4702326

>>4702344
>>4702341
>>4702338
>>4702332
>>4702327
>>4702322
>>etc

>spends all day making engineering image macros to "troll" on /sci/

Faggotry thy name is you.

>>4702346
>>4702342
>>4702340
>>4702334

>>4702348
>implying engineers don't make there own pride images

Are you new here?

>>4702354

Seriously, you are sad and pathetic. Nothing I could say could hurt more than the miserable existence you are already living.

energy is an illusion:

energy only exists as the imbalance of states,

potential energy cant exist in a world that is uniform in property,

The second law of thermodynamics dictates the tendency that over time, differences in temperature, pressure, and chemical potential equilibrate in an isolated physical system

Thus eventually all things having a uniform property energy equals 0

Hence energy only exists as an imbalance, the act that separated it all is unknown

Classic /sci/!

I was wondering what happened to all the engineers! We miss you!

>>4702359

>>4702362

>itt one shameless samefag who spends all day making these images

You must be a physicist or something, that explains why you have all the spare time.

>So.. energy can not be created nor destroyed.

THE FUCK IT CAN'T, WE'RE HUMANITY NIGGER.

WE'LL FIND A WAY.

Contribootying

>>4702366

>>4702373
>engineer

>>4702373
>>4702377

>works all day with gay image macros
>claims to be straight

Apparently "scientists" can be gay too.

>>4702366
>thinks it would all day take to make an image

The stupidity of the engineer always seem to amaze me

>>4702381
>implying this thread isn't all engineers

Share in the pride bro. Be free!

>>4702378
>>4702377
>>4702373

You know, I'm not particularly offended by these images and am not easily butthurt by weak trolling, but I do kind it a little queer that you enjoy looking at these images so much.

>>4700666
bumping classic /sci/

>>4702382
>>4702365
These are hilarious. I demand more material like this.

>>4702387
I ENJOY LOOKING AT GAY PORN!
I AM AN ENGINEER AND PROUD OF IT!

Ok, just want to let you fags know that I'm officially heading out now, but please don't let that stop you from posing all your gay images. I wouldn't want to spoil your faggot party.

>>4702397
>faggot

The proper term is "engineer". Learn some tolerance pal.

this thread is dildos

>>4702400
We have funnier and subtler ways to put it.

>>4702397

>>4702406

Funny how most of /sci/ mocks engineers and yet lacks the intelligence to even become one, much less anything else substantial.

>>4702412
Dont see medicine in either category. Are we allowed to talk about medicine?

>>4702411
>>4702411
but tesla was an engineer

>>4702431
Medicine would be /fit/

>>4702420
>engineer
>intellegent