Stoplight nyob rau hauv lub tshuab nqus tsev vacuum
Raws li physicist James Franson ntawm University of Maryland, uas kawm supernova SN 1987A, qhov ceev ntawm lub teeb txo qis hauv lub tshuab nqus tsev. Nws cov ntawv no tau luam tawm nyob rau hauv cov ntawv xov xwm muaj koob npe tshawb fawb "Journal of Physics", yog li lawv ntseeg tau. Yog tias lawv tau lees paub, nws yuav txhais tau tias muaj kev hloov pauv loj hauv kev tshawb fawb, kho qhov ceev ntawm lub teeb hauv lub tshuab nqus tsev (299792,458 km / h) ua ib qho tseem ceeb.
Franson tau pom tias muaj qhov sib txawv ntawm qhov ceev uas cov neutrinos thiab photons los ntawm supernova ncav cuag peb. Neutrinos tuaj txog ob peb teev ua ntej tshaj photons. Raws li tus kws kho mob, qhov no tej zaum yuav yog vim qhov tseeb tias hauv lub tshuab nqus tsev, photons tuaj yeem polarized rau hauv electrons thiab positrons, uas tom qab ntawd rov ua dua rau hauv photons. Raws li cov khoom sib cais, gravitational kev sib cuam tshuam tuaj yeem tshwm sim ntawm lawv, ua rau lub deceleration.
Nws ua raws li lub teeb qeeb qeeb nws yuav tsum tau mus ncig, txij li qhov tshwm sim ntawm kev ua tiav ib nrab stratifications nce. Ntawm qhov kev ncua deb ntsuas hauv tsheej lab ntawm lub teeb xyoo, photon ncua sij hawm ntawm lub teeb tuaj yeem yog lub lis piam.
