Hottest Questions Today

1

vote

1

answer

32

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Does Doppler effect happen instantly?

modified 16 mins ago The Photon 10.6k

1

vote

0

answers

21

views

Single-particle QM

quantum-mechanics quantum-information

asked 2 hours ago PhysMath 196

0

votes

0

answers

17

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Why are there no potential operators that are non-diagonal in position basis?

quantum-mechanics potential-energy hamiltonian

modified 43 mins ago DanielSank 18.6k

0

votes

1

answer

46

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Would possibility of instant communication break physics?

special-relativity faster-than-light

answered 1 hour ago Acccumulation 4,032

-3

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2

answers

57

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Can someone show me the chain of events which will lead to a faraway hurricane when I clap my hands (leaving everything else the same)?

chaos-theory

answered 1 hour ago Acccumulation 4,032

1

vote

3

answers

90

views

Shooting someone's past self using special relativity

special-relativity relativity

answered 2 hours ago paradoxy 149

0

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0

answers

22

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Finite conformal transformations of fields from infinitesimal

quantum-field-theory field-theory conformal-field-theory representation-theory scale-invariance

modified 1 hour ago vanger 50

-1

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0

answers

19

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Is the attraction between two magnets stronger than a magnet and metal?

electromagnetism

asked 3 hours ago Narcotixs 99

1

vote

2

answers

33

views

Is a single radon daughter atom in air a solid?

phase-transition

modified 4 hours ago probably_someone 20.5k

0

votes

0

answers

15

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How can I plot numerically density of states against energy for semi-Dirac materials? [on hold]

quantum-mechanics condensed-matter solid-state-physics semiconductor-physics topological-insulators

modified 1 hour ago Qmechanic♦ 110k

0

votes

2

answers

31

views

Concave magnifier lens

optics lenses

answered 1 hour ago DJohnM 8,734

2

votes

1

answer

21

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What are the necessary conditions for relative angular velocity to be defined?

newtonian-mechanics rotational-kinematics relative-motion angular-velocity

modified 2 hours ago InfiniteLooper 121

2

votes

2

answers

38

views

Why were pulsars not discovered in the visual spectrum?

astronomy neutron-stars pulsars

answered 4 hours ago PM 2Ring 3,772

2

votes

0

answers

27

views

Einstein equations in the spherically symmetric, static case

general-relativity spacetime symmetry coordinate-systems curvature

modified 3 hours ago Qmechanic♦ 110k

-1

votes

0

answers

25

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Mathematics required for understanding quantum operators and the preservation of wave-function's norm [on hold]

quantum-mechanics operators hilbert-space education normalization

modified 3 hours ago Qmechanic♦ 110k

0

votes

1

answer

29

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Work done by ideal gas under a reversible process which is not isobaric, isochoric, isothermal, adiabatic

thermodynamics work ideal-gas reversibility

modified 4 hours ago HSPrzepa 3

0

votes

1

answer

36

views

Why an open tube at both ends suffers resonance? [on hold]

thermodynamics acoustics wavelength resonance

modified 2 hours ago Qmechanic♦ 110k

0

votes

0

answers

28

views

Number of points where the electric field is zero

homework-and-exercises electrostatics electric-fields charge equilibrium

modified 4 hours ago Qmechanic♦ 110k

59

votes

5

answers

11k

views

Why isn't my calculation that we should be able to see the sun well beyond the observable universe valid?

optics electromagnetic-radiation photons

answered 11 hours ago user21820 1,479

-1

votes

0

answers

21

views

Curve traced by charged strings? [on hold]

classical-mechanics electrostatics continuum-mechanics

modified 4 hours ago Bijayan Ray 24

0

votes

0

answers

21

views

Resonant Hamiltonian Mechanics

hamiltonian-formalism perturbation-theory resonance

asked 4 hours ago Roshan Thomas Eapen 6

1

vote

0

answers

16

views

resource recommendation for machine learning

resource-recommendations

asked 5 hours ago Luqman Saleem 287

1

vote

0

answers

15

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Ground state of an odd, deformed nucleus: intuition for what happens to the $j_x$ and $j_y$ of the odd particle

quantum-mechanics angular-momentum nuclear-physics

modified 5 hours ago Ben Crowell 57.2k

-1

votes

0

answers

32

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Changing topics from PhD to Postdoc [on hold]

soft-question

asked 5 hours ago P. C. Spaniel 1,308

0

votes

1

answer

48

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Could a soft telescope be created?

astronomy telescopes

answered 6 hours ago tfb 18.6k

1

vote

0

answers

22

views

What does a supercharge physically conserve? [on hold]

supersymmetry spinors superalgebra

asked 5 hours ago user45757 51

2

votes

0

answers

11

views

Intermediate product of CNO cycle

nuclear-physics astrophysics fusion nucleosynthesis

asked 4 hours ago Milo Bem 111

2

votes

1

answer

37

views

Why does a non-linear system lead to interaction and frequency mixing between input's?

waves fourier-transform frequency interactions non-linear-systems

modified 6 hours ago Qmechanic♦ 110k

3

votes

0

answers

35

views

Scalar electrodynamics “seagull” vertex factor

quantum-field-theory quantum-electrodynamics feynman-diagrams s-matrix-theory

modified 5 hours ago Dave 43

2

votes

1

answer

32

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Times associated with Absorption and Emission Processes

quantum-mechanics atomic-physics absorption photon-emission two-level-system

modified 5 hours ago eranreches 3,492

1

vote

0

answers

17

views

How does a mister form the mist?

pressure everyday-life

asked 5 hours ago Zam 90

7

votes

4

answers

1k

views

Does a proton have a binding energy?

nuclear-physics physical-chemistry nuclear-engineering protons binding-energy

modified 13 hours ago Luaan 4,539

0

votes

2

answers

27

views

Work-kinetic energy theorem for time-dependent force

newtonian-mechanics forces energy work time

modified 7 hours ago Qmechanic♦ 110k

1

vote

3

answers

60

views

What does it mean that charged particles in orbits undergoing acceleration would emit electromagnetic radiation?

electromagnetic-radiation atomic-physics atoms subatomic

answered 46 mins ago Ján Lalinský 17.4k

8

votes

2

answers

118

views

Are there cases where $\nabla\cdot\iiint\frac{\mathbf{J}(\mathbf{x}')}{\left|\mathbf{x}-\mathbf{x'}\right|}\mathrm{d}V' \neq 0$?

electromagnetism vector-fields magnetostatics

modified 6 hours ago Cryo 849

2

votes

1

answer

52

views

QM: Why is the geometric phase not zero?

quantum-mechanics

answered 10 hours ago By Symmetry 4,860

2

votes

0

answers

45

views

Time after which the 3 particles will meet? [on hold]

homework-and-exercises kinematics geometry

modified 24 mins ago Suraj Sharma 11

0

votes

0

answers

43

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Proving Poisson bracket relations $\{\phi, P^r\}=\Pi^r$ in Ticciati's “QFT for Mathematicians”

homework-and-exercises field-theory poisson-brackets functional-derivatives

modified 7 hours ago Qmechanic♦ 110k

0

votes

0

answers

21

views

Degrees of freedom [on hold]

classical-mechanics rigid-body-dynamics degrees-of-freedom

modified 7 hours ago J. Murray 9,012

2

votes

1

answer

45

views

How can a gas be in circular orbit when centrifugal force is dominant in an accretion disk around a black hole?

astrophysics accretion-disk

answered 7 hours ago Ben Crowell 57.2k

1

vote

0

answers

26

views

Validity of kinetic theory

kinetic-theory semiclassical weyl-semimetal

asked 8 hours ago Funzies 1,193

1

vote

1

answer

32

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Free fermion Lagrangian invariance under chiral symmetry

lagrangian-formalism mass symmetry field-theory chirality

modified 9 hours ago Francesco Arnaudo 152

3

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2

answers

60

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Gauge fixing, invertibility and Green's functional

quantum-field-theory gauge-theory propagator regularization gauge

answered 58 mins ago my2cts 7,182

2

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0

answers

28

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Entropy in non-homogeneous equilibrium states and local thermodynamic equilibrium

thermodynamics fluid-dynamics statistical-mechanics entropy

modified 8 hours ago FraNicc 11

-2

votes

1

answer

34

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Air pressure in bars body

forces pressure air

modified 10 hours ago Bob D 8,575

0

votes

1

answer

53

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At what Force does the Rod break? [on hold]

experimental-physics material-science

answered 9 hours ago Naga Sandesh Goli 79

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