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3 giorni fa · The applicability of Eliashberg theory, for fermions interacting with fluctuations of a soft collective boson near a quantum-critical point (QCP) in two dimensions, remains a subject of debate. The velocity of the soft boson is comparable to the Fermi velocity. Hence, Migdal's justification of Eliashberg theory is formally not applicable. The authors argue here that some elements of Migdal's ...
3 giorni fa · The main equation used in determining gravitational forces is Newton’s Law of Gravitation, which can be calculated as: \(F = G(mM / d^2)\) mM here is the product of our two masses, with an example being the mass of some person and the mass of the Earth, which would mean the Force calculated is the Force of Attraction between the Earth and this person.
5 giorni fa · A photon (from Ancient Greek φῶς, φωτός (phôs, phōtós) 'light') is an elementary particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force. Photons are massless particles that always move at the speed of light measured in vacuum.
1 giorno fa · Dirac's equation also contributed to explaining the origin of quantum spin as a relativistic phenomenon. The necessity of fermions (matter) being created and destroyed in Enrico Fermi 's 1934 theory of beta decay led to a reinterpretation of Dirac's equation as a "classical" field equation for any point particle of spin ħ /2, itself subject to quantisation conditions involving anti-commutators .
1 giorno fa · But at the moment a measurement is made, the wave function “collapses”. Schrödinger’s equation ceases to be applicable, and instead the system’s new wave function is described with all the probability stacked up in one place—after all, you can no longer speak of probabilities when you know 100% what was the result of the measurement.
3 giorni fa · Antonino Zichichi, docente emerito di fisica superiore all’Università di Bologna e fondatore del Centro di cultura scientifica Ettore Majorana, descrive così al Sir l’individuazione del bosone di Higgs ‘ ribattezzato dai media ‘particella di Dio’ ‘ all’indomani dell’annuncio del Cern.
4 giorni fa · The Standard Model of particle physics explains the electromagnetic, nuclear strong, and nuclear weak forces. It describes the forces and behavior of the Universe’s fundamental particles: quarks ...
