These are organized by a classification scheme developed exclusively for Cosma. More…
force : any of the natural influences (as electromagnetism, gravity, the strong force, and the weak force) that exist especially between particles and determine the structure of the universe — Webster
Forces in the universe are based on four fundamental interactions. The strong and weak forces are nuclear forces that act only at very short distances, and are responsible for the interactions between subatomic particles, including nucleons and compound nuclei. The electromagnetic force acts between electric charges, and the gravitational force acts between masses. All other forces in nature derive from these four fundamental interactions. For example, friction is a manifestation of the electromagnetic force acting between the atoms of two surfaces, and the Pauli exclusion principle, which does not permit atoms to pass through each other. Similarly, the forces in springs, modeled by Hooke’s law, are the result of electromagnetic forces and the Exclusion Principle acting together to return an object to its equilibrium position. Centrifugal forces are acceleration forces that arise simply from the acceleration of rotating frames of reference — Wikipedia
Physics News -- ScienceDaily Physics News and Research. Why is the universe more partial to matter than antimatter? How could fuel cells be more efficient? Read current science articles on physics.
Quantum internet goes hybrid
on November 22, 2017 at 6:14 pm
Researchers report the first demonstration of an elementary link of a hybrid quantum information network, using a cold atomic cloud and a doped crystal as quantum nodes as well as single telecom photons as information carriers. The study demonstrates the communication and transmission of quantum information between two completely different types of quantum nodes placed in different labs. […]
How Earth stops high-energy neutrinos in their...
on November 22, 2017 at 6:13 pm
For the first time, a science experiment has measured Earth's ability to absorb neutrinos -- the smaller-than-an-atom particles that zoom throughout space and through us by the trillions every second at nearly the speed of light. The experiment was achieved with the IceCube detector, an array of 5,160 basketball-sized sensors frozen deep within a cubic kilometer of very clear ice near the South Pole. […]
Lightning, with a chance of antimatter
on November 22, 2017 at 6:13 pm
Researchers find that lightning strikes causes photonuclear reactions in the atmosphere, creating antimatter. […]
Dark matter and dark energy: Do they really exist?
on November 22, 2017 at 4:30 pm
Researchers have hypothesized that the universe contains a 'dark matter.' They have also posited the existence of a 'dark energy.' These two hypotheses account for the movement of stars in galaxies and for the accelerating expansion of the universe. But, according to a researcher, these concepts may be no longer valid: the phenomena can be demonstrated without them. This research exploits a new theoretical model based on the scale invariance of the empty space. […]
Nano-watch has steady hands
on November 21, 2017 at 6:25 pm
A new nanomechanical hand shows the time of an electronic clock, by spinning a tiny cylinder using light. A silicon nanorod, less than a thousandth of a millimetre long, can be trapped in thin air using focused laser beams, and spun to follow the ticking of a clock, losing only one-millionth of a second over four days. […]