Quantum Physics Forum

Post thread
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

Undergrad What is matter?
Undergrad Speed of information in a medium
  • · Replies 38 ·
2
Replies
38
Views
5K
High School How addition of vectors works if every force is quantized
  • · Replies 20 ·
Replies
20
Views
2K
Graduate What does lambda in nuclear decay mean if it is big?
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Tunneling of light through thin metal films
  • · Replies 12 ·
Replies
12
Views
1K
Undergrad Electron wave addition using phasor diagram
  • · Replies 8 ·
Replies
8
Views
2K
High School Is it possible to find the energy level of a hydrogen atom in this way?
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Robertson uncertainty relation for the angular momentum components
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Is the Vacuum Energy Density Sign Correct for Bosons?
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Constant phase factors in wavefunctions
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad How Does a Qubit Exist as Both 1 and 0 Simultaneously?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad When does the separation of variables work
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad I want to expand a Gaussian wavepacket in terms of sines
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Can a single photon of a single frequency pass through a FP cavity?
  • · Replies 29 ·
Replies
29
Views
2K
Undergrad How Do You Compute the Density Matrix of a Bipartite State?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Noether's Theorem in the Presence of a Charged Operator
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad The lore on complex probabilities
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Derivation of normal Zeeman-Effect
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Is a Time Rotation Operator Analogous to Spatial Rotations Possible?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Electromagnetic radiation, photons, quantized energy levels
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Are All Photons Truly Virtual?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad The classical concept of work in a QCD context?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Virtuals particles, vacuum and infinite energy
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad The theory on the effects of polarizers on particles wavefunctions
  • · Replies 6 ·
Replies
6
Views
1K
Undergrad TISE solutions should be combinations-of-eigenstates, why this is not?
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Is this a valid quantum Cheshire cat?
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Spin state, base transformation
  • · Replies 3 ·
Replies
3
Views
1K
Graduate Question on Zeno time derivation
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Dimensions: Emergent from the Big Bang?
  • · Replies 19 ·
Replies
19
Views
2K
Graduate Question about a research result: Feedback on whether the result is publishable
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Basic question about Bra-Ket notation
  • · Replies 17 ·
Replies
17
Views
2K
High School Entanglement & Superposition Probabilities
  • · Replies 27 ·
Replies
27
Views
2K
High School How are the spins of two entangled photons measured at light speed?
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Can wave particle dualism be replaced by a monistic model?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Very basic questions about operators in QM
  • · Replies 31 ·
2
Replies
31
Views
4K
Undergrad Why don't we bury Schrodinger's Cat?
  • · Replies 143 ·
5
Replies
143
Views
12K
Undergrad Coefficients in the Schrodinger equation and the momentum operator
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad A probability of field amplitude in QFT
  • · Replies 23 ·
Replies
23
Views
2K
Graduate What happens when entangled photons are split into different paths?
  • · Replies 41 ·
2
Replies
41
Views
7K
High School Antiparticles moving opposite direction in time?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Double slit experiment with observer
  • · Replies 14 ·
Replies
14
Views
4K
Undergrad Understanding the Derivation of the Ginzburg Criterion for the Ising Model
  • · Replies 1 ·
Replies
1
Views
1K
High School Are Schrodinger's cat and the double slit experiment the same idea?
  • · Replies 42 ·
2
Replies
42
Views
7K
High School Schrödingers cat, is it just mumbo-jumbo?
  • · Replies 39 ·
2
Replies
39
Views
5K
Graduate Relationship between bare and renormalized beta functions
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Normalization of wave functions
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Is the photon field a vector field and a gauge field?
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Quantitative description of successive Stern-Gerlach measurements
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Most Likely Position of an Electron
  • · Replies 30 ·
2
Replies
30
Views
3K
Undergrad Commutators, operators and eigenvalues
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad How non-conscious can an Observer be and cause wave function collapse?
  • · Replies 23 ·
Replies
23
Views
10K
High School Is the Born rule truly independent from other postulates in quantum mechanics?
  • · Replies 26 ·
Replies
26
Views
2K
Graduate Don't understand equation with overleftrightarrow symbol
  • · Replies 10 ·
Replies
10
Views
2K
High School Quantum Physics Can Explain Earth’s Weather
  • · Replies 20 ·
Replies
20
Views
3K
Graduate Can particles appear and disappear "with" a cause?
  • · Replies 1 ·
Replies
1
Views
2K
High School Lifespan of a Photon: Debunking the Myth of Time Travel
  • · Replies 33 ·
2
Replies
33
Views
3K
Undergrad Why must the state transformation be unitary?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad What is the Uncertainty in the Total Weight of a Collection of Similar Items?
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad The Delayed Choice experiment: Is Photon speed important?
  • · Replies 15 ·
Replies
15
Views
2K
High School Does the Wavefunction of an Electron Collapse When Captured by a Proton?
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad The electron is not point-like?
  • · Replies 21 ·
Replies
21
Views
4K
Undergrad I cannot normalise this: F= Cexp(-r/a)
  • · Replies 10 ·
Replies
10
Views
1K
Undergrad Question about Photons causing Electron Transitions in Atoms
  • · Replies 20 ·
Replies
20
Views
2K
High School Question about double-slit experiment
  • · Replies 7 ·
Replies
7
Views
1K
Undergrad Understanding Ground State Degeneracy in the Transverse Ising Model
  • · Replies 0 ·
Replies
0
Views
1K
Graduate Feynman loop diagrams and Dyson series for anomalous magnetic moment
  • · Replies 80 ·
3
Replies
80
Views
6K
Graduate Photon Bouncing during APD Dead Time in Autocorrelation Measurement
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Time crystals: They require energy added back into them?
  • · Replies 10 ·
Replies
10
Views
2K
Graduate Understanding Ghost Fields in QED: Eliminating Unphysical Degrees of Freedom"
  • · Replies 9 ·
Replies
9
Views
3K
Undergrad The last step of this Green's function proof is not clear
  • · Replies 7 ·
Replies
7
Views
995
Undergrad Intersection of Condensed Matter Theory + High Energy Physics
  • · Replies 0 ·
Replies
0
Views
1K
Undergrad Fine Structure Constant - 10 steps
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Does the Zeno effect freeze all the commuting observables?
  • · Replies 1 ·
Replies
1
Views
1K
Graduate How Does Position Interact with Spin Angular Momentum in Quantum Mechanics?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Question about commutator involving fermions and Pauli matrices
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Correlation Matrix of Quadratic Hamiltonian
  • · Replies 1 ·
Replies
1
Views
992
Undergrad When do classical mechanics and electromagnetics stop working?
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Problem evaluating an anticommutator in supersymmetric quantum mechanics
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Photoelectric effect and Saturation Current
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad What makes up the bare mass of elementary particles?
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Question about the Photoelectric Effect and the Work Function of a Metal
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Looking for resources to learn bra-ket notation
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Looking For Help Understanding Bell's Theorem, Hidden Variables & QM
  • · Replies 80 ·
3
Replies
80
Views
9K
Graduate First Order in Time Derivatives + Phase Space
  • · Replies 1 ·
Replies
1
Views
1K
High School Definition of a random variable in quantum mechanics?
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad Hall Conductivity and Rotational Invariance
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Are there any hypercomplex time values?
  • · Replies 8 ·
Replies
8
Views
1K
Undergrad Generic Form of Hermitian Matrix
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad What Causes Ambiguity in Wick Rotation for Time-Ordered Correlators?
  • · Replies 0 ·
Replies
0
Views
1K
High School Can we say a photon doesn't exist until the wavefunction collapses?
  • · Replies 16 ·
Replies
16
Views
3K
Undergrad Boundary conditions for the momentum space SE
  • · Replies 17 ·
Replies
17
Views
2K
Graduate Wigner Weisskopf method for time varying Perturbation
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Why is entanglement necessary in a quantum computer?
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad How does the quantum of action cause indeterminism?
  • · Replies 6 ·
Replies
6
Views
1K
Undergrad Measurements and uncertainty principle
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad Physical Meaning of the Imaginary Part of a Wave Function
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad In the delayed-choice quantum eraser, why is a stepper motor used?
  • · Replies 2 ·
Replies
2
Views
2K
High School Entangled quants inside a particle accelarator
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad How did Sommerfeld arrive at his quantum condition?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Why is Photon Energy Quantized in Terms of Sine Wave Frequency?
  • · Replies 78 ·
3
Replies
78
Views
7K
Undergrad Force of an Electron on a Potential Wall?
  • · Replies 7 ·
Replies
7
Views
2K