#quantum physics

• Action — A structural physical quantity defined by the product of energy and time, used in analytical and quantum mechanics; a force or influence exerted by one body upon another, according to the principle of dynamics where every action has an equal and opposite reaction. In old technical language, the term is synonymous with action, representing a process of exerting mechanical energy.
• Andreev — A surname of Slavic origin (frequently spelled Andreev, or Andreeva in its feminine form), widespread primarily in the Eastern European and Balkan spaces, representing a patronymic that indicates descent from a father or ancestor named Andrew. In the global scientific and academic world, the name is structurally recognized through the contributions of prominent figures in physics, mathematics, or literature (such as the writer Leonid Andreev or the physicist Alexander Andreev, discoverer of the Andreev reflection).
• Annihilate — To destroy completely, to reduce to nothing, or to annihilate entirely a material entity, a force, a feeling, or an action. In modern and quantum physics, the term describes the structural process whereby an elementary particle interacts with its corresponding antiparticle, converting instantly and fully into pure energy in the form of photons or electromagnetic waves.
• Annihilation — A fundamental physical process of interaction and complete conversion of the mass of an elementary particle and its corresponding antiparticle into radiant energy (high-frequency photons) upon their collision. This phenomenon represents a specialized terminological variant for annihilation, being utilized primarily in astrophysics and quantum physics to describe early structural universe reactions or gamma radiation emissions from active galactic nuclei.
• Antiparticle — An elementary particle that has exactly the same mass, lifetime, and spin as a corresponding particle of ordinary matter, but whose electric charges, quantum numbers, and magnetic moments have opposite mathematical signs. Upon direct contact between a particle and an antiparticle, the structural phenomenon of mutual annihilation occurs, converting their entire mass into energy in the form of high-frequency photons.
• Antisubstance — A hypothetical or experimental form of matter composed entirely of antiparticles (such as antiprotons, antineutrons, and positrons), representing the structural inverse equivalent of ordinary matter. Upon direct contact between a substance and an antisubstance, the physical process of total annihilation occurs, instantly converting the entire mass of both entities into pure energy in the form of high-intensity gamma rays.
• Asymmetry — The absence of symmetry; a structural property of an object, organism, assembly, or phenomenon of not having its component elements arranged equally, proportionally, or mirrored in relation to a point, an axis, or a reference plane. This visual or mathematical imbalance is essential in modern art for creating dynamism, in particle physics, and in biology for describing the delicate morphology of certain organs.
• Astrophysicist — A scientist, researcher, or highly qualified specialist in the field of astrophysics; an expert who applies the methods, theories, and principles of fundamental physics to investigate the structure, dynamic behavior, life cycles, and radiation of celestial bodies. Their activity includes spectral analysis of light emitted by stars, modeling collisions between black holes, or interpreting global gravitational anomalies.
• Attosecond — An extremely short unit of time measurement, equivalent to one billionth of a billionth of a second, or ten to the power of minus eighteen seconds (10⁻¹⁸ s). This structural element represents the fundamental time scale at which the dynamic movements of electrons inside atoms and molecules occur, serving as a key unit in modern laser physics research rewarded with the Nobel Prize.