Theoretical physics, anyone else like it?
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- akimm
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d11wtq
-- space is comprised of about 80% >= of dark matter, hence the reason we can't see black holes and other structures, without using telescopes like doppler.
-- space is comprised of about 80% >= of dark matter, hence the reason we can't see black holes and other structures, without using telescopes like doppler.
Last edited by akimm on Sat Oct 21, 2006 6:45 pm, edited 1 time in total.
- akimm
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Jcart:
absolute zero is impossible to reach yet, as I said in my previous post, when one reaches absolute zero, it is thought that they will be no more, no massI'm a bit confused about your explanation. Temperature is an interval measurement, meaning 0 does not mean no temperature. So how can zero radiation mean zero temperature?
- Buddha443556
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- Chris Corbyn
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Now that's the usual confusing question that gets me. If space is "there" then where is it? If you catch my meaning.Buddha443556 wrote:How would one find or even construct such a space?So in theory, as per feyd's last post if space has no matter (dark matter anybody???) then it will have no temperature as their are no atoms to move and therefore no entropy.
It's the same with the idea of time. If time has a past, a present and a future. That means it will never end right? Does that mean it never began?
This is on topic:
A few days ago i read on CNN.com tech section that scientists were able to teleport (right word?) a few atoms a few meters.
A few days ago i read on CNN.com tech section that scientists were able to teleport (right word?) a few atoms a few meters.
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- akimm
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Teleport?
I do wonder if you're using the right word, teleport as far as I understand it means to move from one place to another, technically in an electron accelarator the smart people claim, when we speed up electrons as close to the speed of light as it can get, time slows, in this we effectively age quicker and time moves slower, in space, you actually age a few seconds slower, the faster you go, the slower you age.
time has a begining, we can trace light back to the big bang some claim, with the string theory we have dust and particles that are millions of years old, flying through space.
I don't know if time will end, but our time as humanity is on a clock, many clocks actually, in millions of years, provided no nuclear holacaust and baring any other natural catastrophy we will die because the sun will have spent all of its chemical up, becomming a red dwarf, we will freeze before this, but if we don't the super nova will obliderate us and anything in the universe.
Tell me more of the teleport though, and I wonder how feasible that is, how could they know the exact location of any atom, because, the heisenburg uncertainty principal tells us we can never know the exact velocity and momemuntum of any particle.
I do wonder if you're using the right word, teleport as far as I understand it means to move from one place to another, technically in an electron accelarator the smart people claim, when we speed up electrons as close to the speed of light as it can get, time slows, in this we effectively age quicker and time moves slower, in space, you actually age a few seconds slower, the faster you go, the slower you age.
time has a begining, we can trace light back to the big bang some claim, with the string theory we have dust and particles that are millions of years old, flying through space.
I don't know if time will end, but our time as humanity is on a clock, many clocks actually, in millions of years, provided no nuclear holacaust and baring any other natural catastrophy we will die because the sun will have spent all of its chemical up, becomming a red dwarf, we will freeze before this, but if we don't the super nova will obliderate us and anything in the universe.
Tell me more of the teleport though, and I wonder how feasible that is, how could they know the exact location of any atom, because, the heisenburg uncertainty principal tells us we can never know the exact velocity and momemuntum of any particle.
http://www.cnn.com/2006/TECH/science/10 ... index.htmlcnn.com wrote:The experiment involved for the first time a macroscopic atomic object containing thousands of billions of atoms. They also teleported the information a distance of half a meter but believe it can be extended further.
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- Chris Corbyn
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Maybe many of use will have started life elsewhere by then, far enough away from the blast from the collapse of the sun. Not sure about obilterating anything in the universe. It's a big explosion granted but in terms of the size of things it's not HUGE. Our sun is a relatively small star.akimm wrote:I don't know if time will end, but our time as humanity is on a clock, many clocks actually, in millions of years, provided no nuclear holacaust and baring any other natural catastrophy we will die because the sun will have spent all of its chemical up, becomming a red dwarf, we will freeze before this, but if we don't the super nova will obliderate us and anything in the universe.
I think the teleportation thing was the machine which can accelerate a tiny particle close to (maybe it was faster than) the speed of light. I read about it somewhere. It's a big machine which moved something a matter of millimetres last I read.
- Maugrim_The_Reaper
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I'm just hitting in patches, so correct any presumptions I amke
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This does mean the concept of absolute cold is impossible in the Universe - even if you ignore the leftover microwave waves floating everywhere since the Big Bang...
. Don't you know where you are?
80% or more of the matter tied up in the space occupied by the Universe comprises Dark Energy. Remember, Matter and Energy are equivalent (E=MC^2). We can't see black holes because no light can escape the event horizon. We can see the outer boundary of the Event Horizon (and so detect a BH) since the matter streaming into the BH is moving so fast and colliding so energetically that the whole thing emits x-rays...-- space is comprised of about 80% >= of dark matter, hence the reason we can't see black holes and other structures, without using telescopes like doppler.
Space always contains matter. The emptiest vacuum in the Universe is teeming with particles generated at random. In fact, this can be proven since these particles are generated in pairs (matter and anti-matter in roughly equal quantities) and near a BH as one of the pairs is sucked beyond the Event Horizon, it leaves the other free to escape. This means Black Holes always emit a certain energy as these particles escape. Yep, the mighty BH breaks all conceptions...What is space? A vacumn, which has no matter. If there is no present matter, no heat can exist.
This does mean the concept of absolute cold is impossible in the Universe - even if you ignore the leftover microwave waves floating everywhere since the Big Bang...
Light is energy I believe. It just happens to have both particle and wave behaviour. It's absorbed and emitted... One could argue all energy is matter just to be confusing since it's often discussed as being emitted in finite packages as if it were composed of particles. Of course just to throw a spanner, they also act as waves. I haven't read on the topic in a while, and its not my main area of interest - but the prevailing theories suggest these particles can exist in several places at once until they are measured or interacted with. There's a fun concept to digest...these "particles" have no position until they are observed.You might want to read about particle-wave theories and then think about the effects of black holes on light in close proximity.
Space cannot NOT have matter - fundamental principle of the structure of space is that it's fine structure is not static - it's constantly churning and generating virtual particles of matter/anti-matter. Even in a total theoretical vacuum. Zero temperature does not exist in the Universe.So in theory, as per feyd's last post if space has no matter (dark matter anybody???) then it will have no temperature as their are no atoms to move and therefore no entropy.
You are spaceNow that's the usual confusing question that gets me. If space is "there" then where is it? If you catch my meaning.
Teleportation, as I recall from the last time I read about it, transports information faster than light usually by using an entangled pair of atoms. Each atom in an entangled pair always have identical spin regardless of the distance between them - i.e. time does not delay the switch in spin of the pair. Information is a lot easier to teleport than matter... So don't expect to see folk zipping around any time soon.Tell me more of the teleport though, and I wonder how feasible that is, how could they know the exact location of any atom, because, the heisenburg uncertainty principal tells us we can never know the exact velocity and momemuntum of any particle.
- Maugrim_The_Reaper
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Dark Matter: non-visible matter giving rise to an attractive gravitational effect.
Dark Energy: Energy giving rise to a repulsive anti-gravitational force responsible for the accelerating expansion of the Universe.
Both are two different things. DE accounts for ~80% of all energy/matter in the Universe. DM accounts for ~16%. Normal matter, i.e. the stuff we can see, detect and are made of, accounts for the other ~4%. Not sure on the exact figures, but these are in and around what I recall.
This means approx. 96% of the Universe is composed of something nobody can identify, or detect, or observe directly... And they say science ruins all the surprises...
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Dark Energy: Energy giving rise to a repulsive anti-gravitational force responsible for the accelerating expansion of the Universe.
Both are two different things. DE accounts for ~80% of all energy/matter in the Universe. DM accounts for ~16%. Normal matter, i.e. the stuff we can see, detect and are made of, accounts for the other ~4%. Not sure on the exact figures, but these are in and around what I recall.
This means approx. 96% of the Universe is composed of something nobody can identify, or detect, or observe directly... And they say science ruins all the surprises...
I love physics discussion.
Didnt read the whole thread but:
temperature a mesurement of kninetic energy of particles. Space is not made of particles, it does not have any temperature, nor cold nor warm.
The big sun on dawn/dusk is not a mater of gravitational optics. It's just an ilusion, take a picture and you will be surprised.
Didnt read the whole thread but:
temperature a mesurement of kninetic energy of particles. Space is not made of particles, it does not have any temperature, nor cold nor warm.
The big sun on dawn/dusk is not a mater of gravitational optics. It's just an ilusion, take a picture and you will be surprised.
- akimm
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Anyone ever read anything on branes, constantly colliding dimmensions, there are apparently 11 of them 9 of which are miniscule, the remaining 2 are a bit bigger. There is a lot to discuss here, but I need someone that might be interesting in talking about this, otherwise, any other topics are welcomed.