With the aid of simple theoretical models it is possible to build systems operating strictly according to the rules of classical physics, yet faithfully reproducing the predictions of quantum mechanics for single particles – even those that are the most paradoxical! So what is the real hallmark of quantum behaviour?
Physicists from universities Case Western, Stanford, Stony Brook and Warsaw proposed a theoretical model that suggests the possibility of experimental verification if inside photons exists linear structures in the form of strings of gluons connecting a quark to an antiquark . The photon sources can be arbitrary, high-energy charged particles, such at protons at LHC, schematically sketched in the figure. By emitting a photon, a proton turns to a detector.
Can the topology of microobjects influence the way they move in a fluid? Experiments and simulations of Polish and Swiss researchers published in the Physical Review Letters show that the dynamics of elastic chains settling in a fluid depends on the way they are knotted. The settling chains form flat, toroidal structures composed of several intertwined loops, which swirl around each other. The study is important for the proper interpretation of sedimentation and centrifugation experiments of biomolecules.
Researchers from the Institute of Physical Chemistry PAS in Warsaw have removed the main obstacle in the development of SERS - an extremely sensitive laboratory method of chemical composition analysis. Researchers have developed new substrates, onto which samples for analysis are applied.