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Jac Londe

Most precise test yet of Einstein's gravitational redshift - 0 views

www.physorg.com/news185632345.html

gravity Einstein Onde science atome

shared by Jac Londe on 24 Feb 10 - Cached
  • Jac Londe on 24 Feb 10
     
    -While airplane and rocket experiments have proved that gravity makes clocks tick more slowly - a central prediction of Albert Einstein's general theory of relativity - a new experiment in an atom interferometer measures this slowdown 10,000 times more accurately than before.
Jac Londe

Squeezed light a small step forward toward detecting gravitational waves - 0 views

arstechnica.com/...ecting-gravitational-waves.ars

light waves onde science pĥoton

shared by Jac Londe on 20 Sep 11 - No Cached
  • Gravitational waves are generated by accelerating masses. So, our planet, which is constantly accelerating towards the sun, is sending out a constant stream of gravitational waves. Just really small ones. Likewise, colliding neutron stars will emit a strong burst of gravitational waves. How strong? Well, if the stars were on the other side of our galaxy, a one meter bar on Earth would elongate by about 0.1am (attometer = 10-18m). 
  • orbit of an electron around a hydrogen atom (about 0.05nm),
  • In a light field, the amplitude (a measure of the brightness of the light) and the phase (which controls how to combine light fields) can't both be measured with absolute accuracy—even if you had the perfect measuring device. You can picture the problem as bunches of photons popping into and out of existence, causing the phase and amplitude of the of the light to jitter around. This doesn't add or subtract energy, but it does continuously redistributes the energy along the light beam.
  • ...1 more annotation...
  • You might think that a photon here or there shouldn't make a difference, but the scaling isn't independent of the laser light entering the interferometer. If you have one photon, you will have a photon of noise. If you have four photons, you will have two photons of noise. The noise increases slower than the signal and the laser power is increased. So, the easiest way to improve the signal to noise ratio is to crank up the power.
Jac Londe

ChE386K - 0 views

capsicum.me.utexas.edu/...html

Cours physique quantique onde science photons atomes

shared by Jac Londe on 03 Sep 09 - Cached
  • Jac Londe on 03 Sep 09
     
    Cours de physique quantique
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