Feb 22, 2023Relativistic Interstellar Missions: the physical principlesOne light year equals 9.46 10¹⁵ meters, and the closest star is over 4 light years away from us. These are such enormous distances that visiting other stellar systems is currently science fiction. (By comparison, Pluto is -on average- at ‘only’ 5.9 10¹² meters, i.e. at around 263.2 light-minutes away…Special Relativity6 min readSpecial Relativity6 min read

Dec 6, 2021Fuzziness and falsehood in mathematics21HumanicusThis is a very very interesting and useful contribution. Thank you.This is a very very interesting and useful contribution. Thank you.1 min read1 min read

Oct 25, 2021Fundamental Quanta of ResistanceA very simple account of a quantum phenomenon which connects Solid State Physics to the universal constants. In 1826 Georg Simon Ohm published the well-known, basic law of linear electric circuits,V=RI, where V is the potential difference between the ends of a metallic wire, R the resistance and I the…Quantum Physics7 min readQuantum Physics7 min read

Oct 21, 2021The Semi-Classical Path Integral181Afiq HattaSorry to trouble you, but the propagator is the complex amplitude x_A-->x_B, not the probability.Sorry to trouble you, but the propagator is the complex amplitude x_A-->x_B, not the probability.1 min read1 min read

Sep 12, 2021Quantum Mechanics does not predict Atomic and Molecular OrbitalsTheoretical atomic, molecular and condensed-matter physicists and also theoretical chemists make proper use of orbitals and related techniques. They are aware that such concepts, while useful, can be potentially misleading if taken naively. However in my teaching experience I noticed that many people mistake the orbitals for something fundamental. …Quantum Mechanics13 min readQuantum Mechanics13 min read

Apr 7, 2021Disclosing hidden messages in a dim Star LightGalileo by his telescope transformed Astrology into Astronomy in the modern sense and started the physical understanding of heavenly bodies. However, telescopes based on Geometrical Optics do not allow to see much at stellar distances. Further progress in the theory of light and its properties was needed for the study…Stars13 min readStars13 min read