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Quantum Physics Forum

Join in expert discussion on quantum physics. Quantum physics is the mathematical description of the motion and interaction of subatomic particles. Quantum Mechanics and Field Theory.

Quantum Interpretations and Foundations

I Question about discussions around quantum interpretations

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Questioning Neil Turok's Claim on Quantum Information

Apr 14, 2013 · Replies 6 · Apr 14, 2013

Replies: 6

Views: 3K

Hamiltonian eigenstate problem

Apr 14, 2013 · Replies 9 · Apr 14, 2013

Replies: 9

Views: 2K

Does mass bend the Higgs field as well?

Apr 14, 2013 · Replies 1 · Apr 14, 2013

Replies: 1

Views: 2K

Double Slit & Compton: Understanding the Connection

Apr 14, 2013 · Replies 1 · Apr 14, 2013

Replies: 1

Views: 1K

How to find the ground state of He atom

Apr 12, 2013 · Replies 1 · Apr 14, 2013

Replies: 1

Views: 1K

Does QFT respect conservation of angular momentum?

Apr 2, 2013 · Replies 9 · Apr 14, 2013

Replies: 9

Views: 3K

Calculating Uncertainty in Position for Scientists

Apr 14, 2013 · Replies 1 · Apr 14, 2013

Replies: 1

Views: 1K

Is Uncertainty in Velocity Equal to the Velocity Itself?

Apr 14, 2013 · Replies 3 · Apr 14, 2013

Replies: 3

Views: 1K

How photons and static em feilds work

Apr 12, 2013 · Replies 4 · Apr 14, 2013

Replies: 4

Views: 1K

Why electrons can have only 2 spin orientations?

Apr 12, 2013 · Replies 19 · Apr 13, 2013

Replies: 19

Views: 5K

Imaginary momentum and virtual particles

Apr 13, 2013 · Replies 2 · Apr 13, 2013

Replies: 2

Views: 2K

Can Photons Have Mass? Debate & Answer

Apr 12, 2013 · Replies 11 · Apr 13, 2013

Replies: 11

Views: 3K

Excitation of electrons in atoms

Apr 10, 2013 · Replies 2 · Apr 13, 2013

Replies: 2

Views: 2K

Why are QM wave functions complex?

Apr 7, 2013 · Replies 38 · Apr 13, 2013

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Replies: 38

Views: 11K

Can someone explain degeneracy pressure in simple terms?

Apr 12, 2013 · Replies 4 · Apr 13, 2013

Replies: 4

Views: 3K

Should the speed of light be slightly uncertain?

Apr 8, 2013 · Replies 30 · Apr 12, 2013

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Replies: 30

Views: 4K

Is there a connection between spinors and isotropic vectors in QM and QFT?

Apr 6, 2013 · Replies 10 · Apr 12, 2013

Replies: 10

Views: 4K

Paraparticles and Parastatistics

Apr 10, 2013 · Replies 6 · Apr 12, 2013

Replies: 6

Views: 2K

When is classical mechanics valid for describing motion of atoms?

Apr 12, 2013 · Replies 2 · Apr 12, 2013

Replies: 2

Views: 1K

9j symbol expansion in 6j symbols

Apr 10, 2013 · Replies 4 · Apr 12, 2013

Replies: 4

Views: 3K

Is [x,p]=i quantum mechanical?

Apr 11, 2013 · Replies 1 · Apr 12, 2013

Replies: 1

Views: 2K

Mistake in proof regarding degeneracy property

Apr 11, 2013 · Replies 2 · Apr 12, 2013

Replies: 2

Views: 1K

Energy of interacting particle and time evolution of p(x)

Apr 11, 2013 · Replies 1 · Apr 11, 2013

Replies: 1

Views: 1K

Why does a deuteron nucleus have spin 1? Hydrogen spin 1/2?

Apr 11, 2013 · Replies 8 · Apr 11, 2013

Replies: 8

Views: 6K

What is the quantum mechanics descriptions for a plasma radiation

Apr 11, 2013 · Replies 1 · Apr 11, 2013

Replies: 1

Views: 1K

Quantum entanglement (information transmitted )

Apr 11, 2013 · Replies 4 · Apr 11, 2013

Replies: 4

Views: 2K

Photon interacting with 1D-boundary

Apr 11, 2013 · Replies 2 · Apr 11, 2013

Replies: 2

Views: 1K

Selection rules for atomic transitions

Apr 10, 2013 · Replies 3 · Apr 11, 2013

Replies: 3

Views: 3K

Is the Transmission Probability of a Vertically Polarized Photon Really 1.0?

Apr 7, 2013 · Replies 7 · Apr 11, 2013

Replies: 7

Views: 4K

How does visible light carry energy through reflection?

Apr 10, 2013 · Replies 1 · Apr 11, 2013

Replies: 1

Views: 1K

Solutions of the schrödinger eq. for a potential step

Apr 6, 2013 · Replies 8 · Apr 11, 2013

Replies: 8

Views: 3K

Schrodinger equation subjected to general potential

Apr 10, 2013 · Replies 1 · Apr 10, 2013

Replies: 1

Views: 1K

Why is the concept of a one dimensional box used?

Apr 10, 2013 · Replies 4 · Apr 10, 2013

Replies: 4

Views: 2K

Is There a Metric Tensor in Hilbert Space That Transforms Vectors to Duals?

Jul 22, 2011 · Replies 14 · Apr 10, 2013

Replies: 14

Views: 6K

Changing variables in the Schrodinger equation

Apr 9, 2013 · Replies 1 · Apr 10, 2013

Replies: 1

Views: 2K

Question about noether's theorem

Apr 9, 2013 · Replies 2 · Apr 10, 2013

Replies: 2

Views: 1K

Dark state & schrödinger equation

Apr 7, 2013 · Replies 5 · Apr 10, 2013

Replies: 5

Views: 2K

What happens when we measure spin of a fermion?

Apr 2, 2013 · Replies 2 · Apr 10, 2013

Replies: 2

Views: 2K

How does a collider know both the energy and position of the particle?

Apr 9, 2013 · Replies 2 · Apr 9, 2013

Replies: 2

Views: 2K

Are macroscopic objects self-collapsing ?

Apr 9, 2013 · Replies 2 · Apr 9, 2013

Replies: 2

Views: 2K

Why Do Electrons Closer to the Nucleus Have Lower Energy?

Apr 9, 2013 · Replies 3 · Apr 9, 2013

Replies: 3

Views: 2K

Commutator with Tensor Notation

Apr 6, 2013 · Replies 11 · Apr 9, 2013

Replies: 11

Views: 6K

Orbital angular momentum and powers of k

Apr 7, 2013 · Replies 4 · Apr 9, 2013

Replies: 4

Views: 1K

Quantum amplitudes versus probability

Mar 27, 2013 · Replies 14 · Apr 9, 2013

Replies: 14

Views: 4K

Expectation values for Hydrogen

Apr 8, 2013 · Replies 2 · Apr 9, 2013

Replies: 2

Views: 2K

Quantum eraser experiment - another thought experiment

Mar 17, 2013 · Replies 19 · Apr 8, 2013

Replies: 19

Views: 4K

Book or notes for 'Quantum Field Theory II' by Francois David (PSI)

Apr 8, 2013 · Replies 1 · Apr 8, 2013

Replies: 1

Views: 6K

Problems with photoelectric effect lab

Apr 7, 2013 · Replies 2 · Apr 8, 2013

Replies: 2

Views: 2K

Why is the Matrix Exponential Related to the Hamiltonian in QM?

Apr 7, 2013 · Replies 9 · Apr 7, 2013

Replies: 9

Views: 5K

QM operator and double slit experiment doubt basics

Apr 5, 2013 · Replies 3 · Apr 6, 2013

Replies: 3

Views: 2K

General Entanglement and Measurement

Apr 5, 2013 · Replies 3 · Apr 6, 2013

Replies: 3

Views: 2K

Amplitude's time dependence in Heisenberg representation

Apr 6, 2013 · Replies 1 · Apr 6, 2013

Replies: 1

Views: 1K

Energies and numbers of bound states in finite potential well

Apr 5, 2013 · Replies 2 · Apr 6, 2013

Replies: 2

Views: 5K

Valid reason to reject the Bohr model?

Mar 31, 2013 · Replies 9 · Apr 6, 2013

Replies: 9

Views: 5K

History of Planck's equation(s)

Mar 31, 2013 · Replies 16 · Apr 6, 2013

Replies: 16

Views: 4K

Is There Room for Interpretation in Quantum Mechanics?

Apr 3, 2013 · Replies 9 · Apr 5, 2013

Replies: 9

Views: 2K

Quantum Scale, Statistical Physics

Apr 5, 2013 · Replies 1 · Apr 5, 2013

Replies: 1

Views: 1K

Operators and the position representation

Apr 5, 2013 · Replies 2 · Apr 5, 2013

Replies: 2

Views: 2K

Does photon lose its momentum?

Apr 4, 2013 · Replies 5 · Apr 5, 2013

Replies: 5

Views: 4K

Can one speak of the wave function of a object measured?

Apr 5, 2013 · Replies 2 · Apr 5, 2013

Replies: 2

Views: 1K

Explanation behind Moseley's Law?

Mar 31, 2013 · Replies 3 · Apr 5, 2013

Replies: 3

Views: 2K

Interference in Quantum Mechanics (Basic)

Mar 8, 2013 · Replies 21 · Apr 5, 2013

Replies: 21

Views: 5K

Plotting a wavefunction for a finite potential well doesn't work out

Apr 4, 2013 · Replies 2 · Apr 5, 2013

Replies: 2

Views: 3K

Solving the Hydrogen Molecule computationally

Apr 3, 2013 · Replies 2 · Apr 4, 2013

Replies: 2

Views: 2K

Energy levels for a 3D cubical box

Mar 31, 2013 · Replies 4 · Apr 4, 2013

Replies: 4

Views: 2K

Electron is it a particle or wave ?

Apr 1, 2013 · Replies 26 · Apr 4, 2013

Replies: 26

Views: 4K

What is the use of WKB after Schrodinger equation is established?

Apr 4, 2013 · Replies 1 · Apr 4, 2013

Replies: 1

Views: 2K

Dirac eq gamma matrices question

Apr 3, 2013 · Replies 4 · Apr 4, 2013

Replies: 4

Views: 3K

Is every state an eigenstate of an observable?

Mar 30, 2013 · Replies 27 · Apr 4, 2013

Replies: 27

Views: 5K

Schrodinger equation for close and opens system

Apr 3, 2013 · Replies 4 · Apr 4, 2013

Replies: 4

Views: 2K

Is Quantum Mechanics Really Simple to Understand for Beginners?

Apr 3, 2013 · Replies 19 · Apr 4, 2013

Replies: 19

Views: 3K

Entanglement at cosmic distances possible?

Apr 3, 2013 · Replies 1 · Apr 3, 2013

Replies: 1

Views: 1K

How can bosons made of fermions occupy the same quantum state?

Apr 2, 2013 · Replies 7 · Apr 3, 2013

Replies: 7

Views: 4K

Stimulated Emission: Understanding Its Changing Rate

Mar 14, 2013 · Replies 4 · Apr 3, 2013

Replies: 4

Views: 3K

QM: Potential Energy & Particle Free Fall

Apr 3, 2013 · Replies 2 · Apr 3, 2013

Replies: 2

Views: 1K

Problems with a Charged Particle in a Magnetic Field

Jan 9, 2013 · Replies 5 · Apr 3, 2013

Replies: 5

Views: 2K

Proof of vailidity of WKB approximation Please help

Mar 31, 2013 · Replies 8 · Apr 3, 2013

Replies: 8

Views: 3K

How can a photon move something( light moves), if it doesn't have a ma

Apr 2, 2013 · Replies 12 · Apr 3, 2013

Replies: 12

Views: 4K

Fourier transform of integration measure (Peskin and Schroeder)

Apr 3, 2013 · Replies 1 · Apr 3, 2013

Replies: 1

Views: 2K

Splitting up of functional integral (Peskin and Schroeder)

Apr 3, 2013 · Replies 2 · Apr 3, 2013

Replies: 2

Views: 3K

Understanding Virtual Particles: An Introduction to the Concept and Properties

Apr 2, 2013 · Replies 3 · Apr 3, 2013

Replies: 3

Views: 2K

Z-direction. Quantisation axis

Apr 3, 2013 · Replies 1 · Apr 3, 2013

Replies: 1

Views: 2K

Decoherence And What happens in reality

Mar 12, 2013 · Replies 5 · Apr 2, 2013

Replies: 5

Views: 2K

What causes faraday effect quantum mechanically?

Apr 1, 2013 · Replies 1 · Apr 2, 2013

Replies: 1

Views: 2K

What exactly happens when an electron gains energy?

Apr 1, 2013 · Replies 4 · Apr 1, 2013

Replies: 4

Views: 6K

Correspondence principle for a step potential

Mar 30, 2013 · Replies 6 · Apr 1, 2013

Replies: 6

Views: 3K

Corralling Electrons: Wave-Particle Duality & Probability Waves

Apr 1, 2013 · Replies 2 · Apr 1, 2013

Replies: 2

Views: 1K

Can SSB Be Visually Understood? Ideas for Intuitive Explanations

Mar 30, 2013 · Replies 1 · Apr 1, 2013

Replies: 1

Views: 2K

Circular Interference Patterns in Multi-Slot Experiments

Mar 31, 2013 · Replies 2 · Apr 1, 2013

Replies: 2

Views: 2K

Slater Determinant & Permanent

Apr 1, 2013 · Replies 2 · Apr 1, 2013

Replies: 2

Views: 3K

Equilibrium bond lengths for excited molecules

Mar 31, 2013 · Replies 1 · Apr 1, 2013

Replies: 1

Views: 3K

How do you quantumly entangle particles?

Mar 16, 2013 · Replies 27 · Apr 1, 2013

Replies: 27

Views: 6K

What is the physical significance of having +/- a constant multiplying

Apr 1, 2013 · Replies 1 · Apr 1, 2013

Replies: 1

Views: 1K

Sakurai page 27: What is this 'delta_1'?

Mar 31, 2013 · Replies 7 · Apr 1, 2013

Replies: 7

Views: 2K

Commutativity of the Born Rule

Mar 28, 2013 · Replies 50 · Mar 31, 2013

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Replies: 50

Views: 7K

Trouble with Wick rotation in 1+1d abelian Higgs model

Mar 29, 2013 · Replies 5 · Mar 31, 2013

Replies: 5

Views: 2K

Energy Equvalant of different masses

Mar 30, 2013 · Replies 3 · Mar 31, 2013

Replies: 3

Views: 1K

Understanding Electromagnetic Transitions: |ΔI|=1, ΔIz=0

Mar 23, 2013 · Replies 4 · Mar 31, 2013

Replies: 4

Views: 3K

What is so 'counter-intuitive' about the double-slit experiment?

Aug 14, 2012 · Replies 12 · Mar 30, 2013

Replies: 12

Views: 4K

How was the Taylor expansion for SSB in superconductors done?

Mar 27, 2013 · Replies 6 · Mar 30, 2013

Replies: 6

Views: 2K

Quantum Physics

Quantum physics, or quantum mechanics, is a branch of physics that explores the behavior of matter and energy at the smallest scales, where classical physics principles break down. It introduces the concept of quantization, suggesting that certain properties, such as energy levels, are quantized and can only exist in discrete values.

Quantum mechanics encompasses wave-particle duality, where particles like electrons exhibit both wave and particle characteristics. The theory is probabilistic, relying on probability amplitudes to predict outcomes, and features phenomena like superposition, where particles can exist in multiple states simultaneously.

Quantum physics has transformed our understanding of the microscopic world, leading to technologies like transistors and lasers, and continues to provoke profound questions about the nature of reality and the role of observation in shaping it.

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