/sci/ - Science & Math

[Physics Guy No.2541549]

So, I know many of ya'll are /new/ here....
Here is the deal.....

I will be answering physics questions if they arent' fucking retarded. Got a physics question? Bring it on!

Also, I won't do HW. And yes, I have qualifications galore.

[Anonymous No.2541556]

How to contain negative energy particles? I'm only asking because I'm building a warp drive in my basement and the damn buggers keep escaping.

[Anonymous No.2541555]

why don't quantum mechanics and general relativity work together?

[Anonymous No.2541560]

Why do people ignore the fact that maxwells equations are plus or minus

[Anonymous No.2541559]

Explain how the universe might have no edge and yet finite volume.

[Anonymous No.2541564]

How does time slow down when you are traveling near the speed of light?

[Anonymous No.2541569]

I've had some trouble understanding Noether's Theorem. Can you point me in the direction of some good texts (.pdf, textbook whatever) that could help clear up my misunderstandings?

[Anonymous No.2541581]

http://en.wikipedia.org/wiki/MAGIC_(telescope)

A much more controversial observation is an energy dependence in the speed of light of cosmic rays coming from a short burst of the blazar Markarian 501 on July 9, 2005. Photons with energies between 1.2 and 10 TeV arrived 4 minutes after those in a band between .25 and .6 TeV. The average delay was .030±.012 seconds per GeV of energy of the photon. If the relation between the space velocity of a photon and its energy is linear, then this translates into the fractional difference in the speed of light being equal to minus the photon's energy divided by 2×1017 GeV.
Did they ever explain this?

[Anonymous No.2541584]

The Big Crunch or the Big Freeze?

[Anonymous No.2541598]

How does studying physics at undergraduate level compare to high-school physics?

[Anonymous No.2541602]

>>2541549
So, based on our current level of understanding, are photons able to violate causality or not?

[Josef !!nUf2NflSAyw No.2541607]

>>2541569
1/2, copied from Peskin-Schroeder. Crappy physicist introduction, but works for basic understanding.

[Anonymous No.2541608]

Is it possible to travel through higher dimensions?

If so, would it make faster than light travel unnecessary?

[Physics Guy No.2541619]

>>2541569

[Anonymous No.2541625]

If I 'm in a closer room somewhere, and I chuck a rock up into hte air, then immediately after I've chucked the rock into the air I get out a laser beam and fire it at the rock, increasing the rock's temperature, will the rock travel further in the air than if I hadn't shot it with a laser beam?

[Anonymous No.2541630]

What happens when a rotating magnetic field exceeds the speed of electric?

[Josef !!nUf2NflSAyw No.2541631]

>>2541607
2/2

[Anonymous No.2541636]

>>2541549
yeah I miss /news/ board ;_;

[Anonymous No.2541650]

>>2541607
>>2541619
>>2541631

Thanks guys.

[Josef !!nUf2NflSAyw No.2541652]

>>2541631
3/2, woops

[Anonymous No.2541657]

So you know in those action movies, a car chase is happening, and to make a quick getaway, a car stows away in the back of a truck while they're both going down the highway. Say the car is going 80mph and the truck is going 70mph.

The movies make it seem like the car is able to cruise right on up in the truck bay and come to a stop, but to me it seems like as soon as the driving wheels hit the ramp of the truck, the car would now be going a good 150mph and smash into the driver of the truck at 80mph. Yes or no?

[harbinger !n16yefgE9w No.2541668]

Isn't schroedinger's cat experiment moot because the cat itself is an observer?

[Anonymous No.2541694]

Can you tell us what your qualifications are so that we can know what to ask?

[Physics Guy No.2541690]

>>2541602
All anti-particles are mathematicallty equivalnet to a particle traveling backwards in time.

Example: the positron is simply an electron moving backwards in time.

[Anonymous No.2541702]

>>2541668

[Anonymous No.2541704]

how many pictures of einstein do you have

[Josef !!nUf2NflSAyw No.2541726]

>>2541690 All anti-particles are mathematicallty equivalnet to a particle traveling backwards in time.
Is that so? I mean there's not much time inversion in a charge conjugation (... or is CPT in there as well somewhere). I always thought that "backwards in time travelling" was because Feynman graphs have a "process direction", which roughly corresponds to time - but arrows follow particle number currents, so antiparticles flow against time direction.

[Anonymous No.2541753]

>>2541690

>All anti-particles are mathematicallty equivalnet to a particle traveling backwards in time.

Can anyboody give a citation forr this?

[Physics Guy No.2541757]

>>2541668
The "thought" experiment actually demonstrates that Quantum mechaincal behavior usually cannot be applied to macroscopic objects (like cats). Technically, the act of observation is the act of interaction. Rocks, particles, air, etc, could all be "observers".

[Anonymous No.2541775]

>>2541757

Cats hav brains and senses too.
It would know if It were alive and would be dead if it were dead.

A cat is a very different observer than a rock or other non conscious entity

.

[Anonymous No.2541778]

If time is affected by gravity, and if you get up in a high tower on earth, the time will speed up (i think it's speed up and not down, but that's not my point). My question is: what happens with time and how do you experience time when you are at a place in space where there is no gravity affecting you?

[Anonymous No.2541781]

>>2541690
>Example: the positron is simply an electron moving backwards in time.

Citation needed.

[Anonymous No.2541783]

>>2541775
Not when you're talking about an observer in a physical, quantum mechanical sense.

Take your metaphysics elsewhere.

[Anonymous No.2541785]

Does matter lay in 4 dimensional space, while the forces and interactions between them lay in 3 dimensions?

[Anonymous No.2541790]

>>2541781
Feyman once said: An electron is a positron moving backward in time.

Not sure what he meant, or what physics guy is talking about...

[Anonymous No.2541794]

>>2541783

>Not when you're talking about an observer in a physical, quantum mechanical sense.

Enlighten me

[Physics Guy No.2541802]

>>2541781

[Anonymous No.2541809]

>>2541781
>the positron is simply an electron moving backwards in time.

>>2541790
>An electron is a positron moving backward in time.

>MWF

[Anonymous No.2541810]

>>2541802
But thats just a theory (a gneusss?)

[Anonymous No.2541847]

I read somewhere that in the space between the two event horizons of a rotating black hole, time flows backwards.

Then there's the whole "positron = electron going backward in time" thing.

What happens in the case of a paradox where someone predicts the future based off of these backward-flowing particles/information and attempts to change the events in his future/the particle's past? Is it possible? Does the space-time continuum simply change to account for this new outcome? I imagine it could be a lot like dropping a rock in a pond; the water just moves to accommodate for the intrusion. Time might be as malleable as matter?

[Physics Guy No.2541872]

>>2541847
In general relativity you can construct time loops, and all sorts of fucked up shit like that.

Just becuase an positron is really an elctron moving backwards in time, doenst mean it violates causality. We still see it as a positron moving forward in time.

[Anonymous No.2541882]

>>2541872

What is a time loop?

[Anonymous No.2541902]

>>2541882
He probably means a closed timelike curve.

[Anonymous No.2542036]

>>2541630

Answer me you cunt.

[Anonymous No.2542037]

>>2541902
Oh, like a timecube.

[Josef !!nUf2NflSAyw No.2542050]

Maybe they produced a black hole at CERN after all.