Macroscopic quantum phenomena in superconducting circuits (i.e. solid state qubits etc). I never need to go below 20 mK (using a dilution fridge) but some of the other members of my research group work on time standards (clocks and frequency standards) and they use laser cooling.
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Absolute Zero
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Macroscopic quantum phenomena in superconducting circuits (i.e. solid state qubits etc). I never need to go below 20 mK (using a dilution fridge) but some of the other members of my research group work on time standards (clocks and frequency standards) and they use laser cooling.
I think so, but it doesn't have to be infinite to not have an edge to go past. One of the theories is a finite universe without bounds (an edge). You could move in a straight line in any direction and eventually end up back at your starting point. It works in 3 dimensions just like it works in 2 for a trip on the surface of the earth. You walk in a straight line and end up where you started.
Used to drive me nuts as a kid thinking about what's beyond the universe.
Never Knows Best
Member
Well you can get very close to absolute zero using lasers to force certain gases together, which are suspended in a magnetic field. Then say if you took this apparatus and increased its speed relative to us then it would appear to get cooler and cooler, but it would never reach absolute zero. That is just for atoms and molecular movement. The electrons and everything else in the atom would still be spinning and it would still be causing gravitational pull and all that.
Soccerman06
Diamond Member
Before the universe was created (theory of course), the ball which contained all matter/anti-matter was infinitally hot. But once the Big Bang occured, the universe spread out at a speed faster than the speed of light because of the energy given, so since no electromagnetic radiation is able to move faster than the speed of light and if there was a particle outside of the Big Bang (say a foot away from the expanding universe), that particle would have 0K because there was no energy to give the partle any. That is the only way I could see a particle actually "having" 0 energy, ie temperature. This is assuming that there is a particle outside of the Big Bang expansion.
No, while in classical physics temperature is a measure of fast the particles are moving, the more precise definition involves their kinetic energy. No kinetic energy=absolute zero.
And while there is an upper limit to how fast a particle can move (speed of light) their is no limit to its kinetic energy.
Soccerman06
Diamond Member
There is a limit, infinate.
http://www.myphysicslab.com/spring1.html
graph velocity vs position. set the spring stiffness to 250.
let run for as long as you can.
the spring dampening would represent you trying to cool a particle. the rate at wich it slows
graph velocity vs position. set the spring stiffness to 250.
let run for as long as you can.
the spring dampening would represent you trying to cool a particle. the rate at wich it slows
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