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Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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The Quantum-Mechanical Model of an Atom02:45

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Scalar Notation01:28

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Scalar notation is a useful method for simplifying calculations involving vectors. When vectors are added or subtracted, their components can be added or subtracted separately using scalar notation. For instance, force, a vector quantity, can be broken down into its x and y components, called rectangular components, and then the magnitude and direction of these components can be determined using trigonometric functions.
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Symmetry in Maxwell's Equations01:28

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Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
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Thermodynamic systems undergoing phase transitions or temperature changes experience energy transfer in the form of heat (q) and work (w). For a reversible phase change at constant temperature (T) and pressure (p), the process involves no chemical reaction but results in energy exchange between distinct phases.The heat transferred during this process corresponds to the latent heat of transition, which is the amount of heat energy absorbed or released by a substance when it changes from one...
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Scalar and Vector Triple Products01:06

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Two vectors can be multiplied using a scalar product or a vector product. The resultant of a scalar product is scalar, while with vector products, the resultant is a vector. These rules of the scalar or vector product between two vectors can be applied to multiple vectors to obtain meaningful combinations. The scalar triple product is the dot product of a vector with the cross product of two vectors.
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Related Experiment Video

Updated: Apr 8, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

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Quantum theory with bold operator tensors.

Lucien Hardy1

  • 1Perimeter Institute, 31 Caroline Street North, Waterloo, Ontario, Canada N2L 2Y5 lhardy@pitp.ca.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|July 1, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces bold operator tensors for a new quantum theory formulation. This operational approach to quantum field theory is manifestly covariant and naturally handles apparatus uses.

Keywords:
operational physicsoperator tensorsquantum theory

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Area of Science:

  • Quantum physics
  • Theoretical physics
  • Mathematical physics

Background:

  • The standard formulation of quantum theory often relies on time evolution.
  • A covariant formulation is desirable for quantum field theory.

Purpose of the Study:

  • To present a novel formulation of quantum theory using bold operator tensors.
  • To develop a manifestly covariant approach suitable for quantum field theory.

Main Methods:

  • Representing quantum operations as apparatus uses.
  • Associating operator tensors with apparatus uses.
  • Developing rules for combining operator tensors to yield probability distributions.

Main Results:

  • The formulation reproduces the standard quantum formalism under physicality constraints.
  • Symbolic and diagrammatic representations for calculations are provided.
  • The approach is manifestly covariant, avoiding temporal foliation.

Conclusions:

  • Bold operator tensors offer a new framework for quantum theory.
  • This formulation provides a natural starting point for operational quantum field theory.
  • The manifest covariance is a key advantage for theoretical physics research.