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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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Finding the 3x3 Matrix Representation of SU(2)

Mar 25, 2012 · Replies 6 · Mar 27, 2012

Replies: 6

Views: 3K

Particles and Wigner little groups

Mar 27, 2012 · Replies 2 · Mar 27, 2012

Replies: 2

Views: 2K

What does the wavevector \vec{k} mean?

Mar 23, 2012 · Replies 8 · Mar 27, 2012

Replies: 8

Views: 5K

Query about Grassmann Variables in Lewis Ryder's book

Mar 26, 2012 · Replies 4 · Mar 27, 2012

Replies: 4

Views: 2K

Challenges of very high energy physics

Mar 26, 2012 · Replies 1 · Mar 26, 2012

Replies: 1

Views: 1K

Schwartz Distribution Theory in N variables?

Mar 24, 2012 · Replies 9 · Mar 26, 2012

Replies: 9

Views: 3K

Electron density in terms of squares of wavefunctions

Mar 26, 2012 · Replies 2 · Mar 26, 2012

Replies: 2

Views: 2K

Object Jumping from Quantum Vibrations Statistical Mechanics

Mar 24, 2012 · Replies 5 · Mar 26, 2012

Replies: 5

Views: 2K

Quantum particles expand space?

Mar 25, 2012 · Replies 1 · Mar 26, 2012

Replies: 1

Views: 2K

Braggs law and x-ray crystallography

Mar 25, 2012 · Replies 4 · Mar 26, 2012

Replies: 4

Views: 5K

Eigen Value, Eigen function -Schrodinger wave equation

Feb 15, 2012 · Replies 1 · Mar 26, 2012

Replies: 1

Views: 2K

Detecting Entanglement in Alice Without Measuring Bob

Dec 5, 2011 · Replies 2 · Mar 26, 2012

Replies: 2

Views: 2K

Comparison of strong nuclear force and electromagnetic force

Mar 26, 2012 · Replies 1 · Mar 26, 2012

Replies: 1

Views: 10K

Why is quantum entanglement difficult to realize?

Mar 25, 2012 · Replies 4 · Mar 26, 2012

Replies: 4

Views: 2K

Energy Conservation versus Quantum and Relativistic Effects

Mar 18, 2012 · Replies 8 · Mar 26, 2012

Replies: 8

Views: 2K

Is Quantum Entanglement a Means of Evil Communication Across the Galaxy?

Mar 20, 2012 · Replies 28 · Mar 26, 2012

Replies: 28

Views: 6K

Mach–Zehnder interferometer question, path detection

Mar 24, 2012 · Replies 7 · Mar 25, 2012

Replies: 7

Views: 3K

Question about Quantum Theory regarding hydrogen atom and photon

Mar 11, 2012 · Replies 3 · Mar 25, 2012

Replies: 3

Views: 2K

Time-energy uncertainty and virtual particles

Mar 24, 2012 · Replies 3 · Mar 25, 2012

Replies: 3

Views: 3K

Heisenberg ferromagnet and spin waves

Mar 25, 2012 · Replies 1 · Mar 25, 2012

Replies: 1

Views: 2K

Simplest example where quantization is unknown

Mar 24, 2012 · Replies 9 · Mar 25, 2012

Replies: 9

Views: 3K

Quantum optics is a reference to a c-number

Mar 23, 2012 · Replies 2 · Mar 24, 2012

Replies: 2

Views: 2K

Electrical activity of an atom

Mar 22, 2012 · Replies 3 · Mar 24, 2012

Replies: 3

Views: 2K

Inverting the quantum cloning of photons

Mar 23, 2012 · Replies 1 · Mar 24, 2012

Replies: 1

Views: 2K

Looking for a not gentle introduction to Q. Physics

Mar 23, 2012 · Replies 4 · Mar 23, 2012

Replies: 4

Views: 2K

Objects Disappearing: Is It Possible?

Mar 22, 2012 · Replies 3 · Mar 23, 2012

Replies: 3

Views: 2K

Questionable Question about Photons and Waves

Mar 23, 2012 · Replies 1 · Mar 23, 2012

Replies: 1

Views: 2K

Quantum tunnelling outside the light cone?

Mar 22, 2012 · Replies 2 · Mar 23, 2012

Replies: 2

Views: 3K

Why Can't H-Atoms Emit a Single Photon in the 2s to 1s Transition?

Mar 23, 2012 · Replies 2 · Mar 23, 2012

Replies: 2

Views: 2K

What is negative energy and how does it relate to the capacity for work?

Mar 22, 2012 · Replies 2 · Mar 23, 2012

Replies: 2

Views: 2K

Non central potential and energy dependence

Mar 23, 2012 · Replies 1 · Mar 23, 2012

Replies: 1

Views: 2K

Neutrino and Black Hole Interaction: Approaching, Passing, or Colliding?

Mar 22, 2012 · Replies 5 · Mar 22, 2012

Replies: 5

Views: 2K

What is an observer, defined by QM?

Mar 20, 2012 · Replies 17 · Mar 22, 2012

Replies: 17

Views: 4K

How can the Higgs Boson induce mass?

Mar 22, 2012 · Replies 3 · Mar 22, 2012

Replies: 3

Views: 3K

Landau: Explaining the Definition of "Number of States with Energy

Mar 21, 2012 · Replies 3 · Mar 22, 2012

Replies: 3

Views: 2K

Direct products and direct sums in QM

Mar 22, 2012 · Replies 1 · Mar 22, 2012

Replies: 1

Views: 2K

Bell's derivation; socks and Jaynes

Feb 25, 2012 · Replies 97 · Mar 22, 2012

4

Replies: 97

Views: 16K

Trying to understand (E2 - p2c2 = m2c2 )

Mar 22, 2012 · Replies 2 · Mar 22, 2012

Replies: 2

Views: 2K

Does getting which-way info introduce a phase difference?

Mar 20, 2012 · Replies 3 · Mar 22, 2012

Replies: 3

Views: 2K

Electron oscillation between states

Mar 20, 2012 · Replies 5 · Mar 21, 2012

Replies: 5

Views: 2K

Degeneracy of Hydrogen atomic orbitals with different l-values but same n-value

Mar 17, 2012 · Replies 5 · Mar 21, 2012

Replies: 5

Views: 9K

Multi World Hypothesis and The Double Slit Experiment.

Mar 14, 2012 · Replies 5 · Mar 21, 2012

Replies: 5

Views: 3K

Why isn't momentum a function of position?

Mar 5, 2012 · Replies 69 · Mar 21, 2012

3

Replies: 69

Views: 11K

Why shall Quantum Mechanics accept Relativity?

Mar 8, 2012 · Replies 24 · Mar 21, 2012

Replies: 24

Views: 5K

Schrodinger equation of particle in box

Mar 20, 2012 · Replies 1 · Mar 20, 2012

Replies: 1

Views: 4K

Feynman diagrams for spin 1/2 particles

Mar 17, 2012 · Replies 2 · Mar 20, 2012

Replies: 2

Views: 3K

How Does Entangled Photon Behavior Challenge Local Realism?

Mar 18, 2012 · Replies 8 · Mar 20, 2012

Replies: 8

Views: 3K

Advanced undergrad/grad book for classical mechanics as macro limit of QM

Mar 20, 2012 · Replies 1 · Mar 20, 2012

Replies: 1

Views: 2K

Why we only consider ''group'' symmetry but not general symmetry?

Nov 22, 2011 · Replies 29 · Mar 20, 2012

Replies: 29

Views: 5K

How did Heisenberg derive his famous principle?

Mar 19, 2012 · Replies 13 · Mar 20, 2012

Replies: 13

Views: 3K

What Happens to the Momentum Operator as Planck's Constant Approaches Zero?

Mar 19, 2012 · Replies 2 · Mar 19, 2012

Replies: 2

Views: 2K

Theory of Everything or Troll?

Mar 19, 2012 · Replies 3 · Mar 19, 2012

Replies: 3

Views: 3K

Why Don't Electrons Spin Into the Center of the Nucleus?

Mar 19, 2012 · Replies 2 · Mar 19, 2012

Replies: 2

Views: 2K

Why Vector Spaces? Origins & Benefits

Mar 19, 2012 · Replies 1 · Mar 19, 2012

Replies: 1

Views: 2K

What really causes electromagnetic induction/ the motor effect?

Mar 17, 2012 · Replies 2 · Mar 18, 2012

Replies: 2

Views: 4K

Axiomatic derivation of [X,P]?

Jan 2, 2012 · Replies 23 · Mar 18, 2012

Replies: 23

Views: 5K

When is not necesary to do surface ordering in the non-Abelian Stokes theorem?

Mar 18, 2012 · Replies 1 · Mar 18, 2012

Replies: 1

Views: 2K

Calculating Statistical Operator $\hat{\rho}$

Mar 18, 2012 · Replies 3 · Mar 18, 2012

Replies: 3

Views: 3K

How could a graviton mediate gravity at places such as a black hole?

Mar 12, 2012 · Replies 6 · Mar 18, 2012

Replies: 6

Views: 3K

Delayed Choice Quantum Eraser - double-photon explanation

Mar 7, 2012 · Replies 33 · Mar 18, 2012

2

Replies: 33

Views: 6K

First, second and third quantization formalisms

Mar 17, 2012 · Replies 3 · Mar 18, 2012

Replies: 3

Views: 3K

Photon's Probability of Passing Through Polaroid

Mar 17, 2012 · Replies 1 · Mar 17, 2012

Replies: 1

Views: 2K

Clebsch Gordon coefficients for three spins

Mar 17, 2012 · Replies 1 · Mar 17, 2012

Replies: 1

Views: 4K

Radial probability distribution (rpd)

Mar 15, 2012 · Replies 3 · Mar 17, 2012

Replies: 3

Views: 3K

What is the difference between Compton and Rayleigh scattering?

Mar 17, 2012 · Replies 1 · Mar 17, 2012

Replies: 1

Views: 13K

Conceptual question from Atomic Structure

Mar 17, 2012 · Replies 2 · Mar 17, 2012

Replies: 2

Views: 3K

Is there a quantum theory of magnetism?

Mar 11, 2012 · Replies 15 · Mar 17, 2012

Replies: 15

Views: 10K

Application of Quantum mechanics

Mar 16, 2012 · Replies 3 · Mar 17, 2012

Replies: 3

Views: 2K

Is space a thing or a relationship between existents?

Mar 16, 2012 · Replies 5 · Mar 17, 2012

Replies: 5

Views: 5K

How to deduce the units of hw?

Mar 16, 2012 · Replies 8 · Mar 17, 2012

Replies: 8

Views: 3K

Question about radiation and matter

Mar 15, 2012 · Replies 2 · Mar 17, 2012

Replies: 2

Views: 2K

Entanglement Swapping: A and X Polarization Explained

Feb 23, 2012 · Replies 21 · Mar 17, 2012

Replies: 21

Views: 6K

Infinite square well with finite potential energy inside

Mar 14, 2012 · Replies 12 · Mar 16, 2012

Replies: 12

Views: 7K

Ncaa march madness and quantum mechanics

Mar 16, 2012 · Replies 1 · Mar 16, 2012

Replies: 1

Views: 2K

Measuring orbital angular momentum

Nov 4, 2011 · Replies 2 · Mar 16, 2012

Replies: 2

Views: 2K

How does the length of a 2D conductor affect the transverse Hall resistance?

Mar 16, 2012 · Replies 1 · Mar 16, 2012

Replies: 1

Views: 1K

Does entanglement describe continuity at the micro level?

Mar 16, 2012 · Replies 1 · Mar 16, 2012

Replies: 1

Views: 1K

How Does Hermitian Property Lead to \langle A^2 \rangle in Quantum Mechanics?

Mar 16, 2012 · Replies 2 · Mar 16, 2012

Replies: 2

Views: 1K

Disproving Heisenburg's Uncertanty Principle

Mar 8, 2012 · Replies 21 · Mar 16, 2012

Replies: 21

Views: 4K

How spinor vector envolves in describing the atom

Mar 14, 2012 · Replies 6 · Mar 15, 2012

Replies: 6

Views: 2K

Question about the use of group theory in QM

Mar 12, 2012 · Replies 7 · Mar 15, 2012

Replies: 7

Views: 3K

Pauli's exclusion principle and quantum entanglement

Mar 15, 2012 · Replies 3 · Mar 15, 2012

Replies: 3

Views: 3K

Quantum physics computer program simulations

Mar 15, 2012 · Replies 1 · Mar 15, 2012

Replies: 1

Views: 3K

Electron gas and Pauli principle

Feb 23, 2012 · Replies 18 · Mar 15, 2012

Replies: 18

Views: 4K

Were There Ever Empirical Reasons to Bring Human Consciousness into QM?

Mar 6, 2012 · Replies 44 · Mar 15, 2012

2

Replies: 44

Views: 7K

Schrödinger's cat, pure or mixed state?

Mar 15, 2012 · Replies 1 · Mar 15, 2012

Replies: 1

Views: 3K

Continuity equation equalling a complex number

Mar 12, 2012 · Replies 1 · Mar 15, 2012

Replies: 1

Views: 2K

Hermitian Operator: Definition & Overview

Mar 14, 2012 · Replies 2 · Mar 14, 2012

Replies: 2

Views: 2K

Does Non-Commutativity Explain Quantum Mechanics' Core Principles?

Mar 14, 2012 · Replies 1 · Mar 14, 2012

Replies: 1

Views: 2K

This is a nonsensical question about wavefunctions

Mar 13, 2012 · Replies 7 · Mar 14, 2012

Replies: 7

Views: 3K

Would traveling faster than the speed of light solve the entanglement issue?

Mar 13, 2012 · Replies 5 · Mar 14, 2012

Replies: 5

Views: 2K

QM and Relativity: Can They Coexist in the Explanation of Gravity?

Mar 13, 2012 · Replies 2 · Mar 14, 2012

Replies: 2

Views: 2K

Two separate renormalization group equations?

Mar 12, 2012 · Replies 1 · Mar 13, 2012

Replies: 1

Views: 2K

Spin 1/2 Correlation: Chance of Measuring Spin Down

Mar 12, 2012 · Replies 6 · Mar 13, 2012

Replies: 6

Views: 2K

Dirac Delta function as a Fourier transform

Mar 9, 2012 · Replies 4 · Mar 13, 2012

Replies: 4

Views: 4K

Equations that arise when General Relativity and Quantum Mechanics are merged.

Mar 12, 2012 · Replies 7 · Mar 13, 2012

Replies: 7

Views: 3K

What is charge? i do not want to hear that it is of two kind

Mar 11, 2012 · Replies 6 · Mar 13, 2012

Replies: 6

Views: 2K

Collapse of the wave function, help understand

Mar 12, 2012 · Replies 1 · Mar 13, 2012

Replies: 1

Views: 2K

Can Normalizing a Wave Function be Simplified Using Trig Identities?

Mar 12, 2012 · Replies 1 · Mar 12, 2012

Replies: 1

Views: 2K

Solving a classical problem using quantum physics

Mar 12, 2012 · Replies 2 · Mar 12, 2012

Replies: 2

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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