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Necromancer

Answer a question more than 60 days later with score of 5 or more. This badge can be awarded multiple times.

Awarded 2774 times.

Will a radioactive ball conserve its angular velocity?

Awarded yesterday

rob♦

85.3k19 gold badges160 silver badges316 bronze badges

Entropy and classical mechanics

Awarded Sep 30 at 11:40

stack-delay

2512 silver badges8 bronze badges

The strange character of operator $\nabla$

Awarded Sep 29 at 12:26

Adam Chalcraft

2952 silver badges5 bronze badges

What was Feynman's famous formula?

Awarded Sep 27 at 15:47

Todd Trimble

1511 silver badge3 bronze badges

Lagrangian exercise from Goldstein

Awarded Sep 26 at 2:51

Marco Antonio Ridenti

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Can there be general relativity without special relativity?

Awarded Sep 24 at 21:30

Andrew

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Chemical potential of ideal gas from canonical ensemble

Awarded Sep 24 at 18:45

Schtroumpf

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Matsubara frequencies as poles of distribution function

Awarded Sep 21 at 21:35

Ryan Thorngren

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A rigorous derivation of Hund's rules

Awarded Sep 19 at 22:30

dennismoore94

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Under what conditions is a vector-spinor gamma tracefree?

Awarded Sep 19 at 19:18

user44895

6524 silver badges12 bronze badges

Free parameters in the Standard Model

Awarded Sep 18 at 12:27

Constantin Weisser

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What is the Spectral Form Factor?

Awarded Sep 12 at 22:40

just a phase

5651 silver badge11 bronze badges

Is the universe actually expanding?

Awarded Sep 11 at 17:26

benrg

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Is a charged particle in motion an electric current?

Awarded Sep 11 at 15:42

The_Sympathizer

19.6k1 gold badge41 silver badges76 bronze badges

Does this shadow diffraction effect have a name?

Awarded Sep 11 at 9:42

Mayank Bomb

661 silver badge3 bronze badges

Why is the splash of water always vertical, no matter in which angle the gunfire hits the surface

Awarded Sep 10 at 23:33

wdb

3893 silver badges5 bronze badges

Laplace operator's interpretation

Awarded Sep 9 at 12:26

Terry Bollinger

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Laplace operator's interpretation

Awarded Sep 9 at 12:05

Ali Abbasinasab

1,7893 gold badges15 silver badges21 bronze badges

Yang-Mills vs Einstein-Hilbert Action

Awarded Sep 7 at 16:08

MadMax

3,7859 silver badges30 bronze badges

What is the “exchange energy of electrons”?

Awarded Sep 6 at 12:10

Andrew

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Electron charge from Millikan's oil drop experiment

Awarded Sep 4 at 15:20

Arnav Ramkrishnan

511 silver badge1 bronze badge

Entropy of radiation emitted into space

Awarded Sep 2 at 2:32

N. Virgo

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History of interpretation of Newton's first law

Awarded Aug 30 at 16:43

Timaeus

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Are stars getting more metal-rich, less massive and shorter-lived with cosmic time?

Awarded Aug 29 at 2:46

ProfRob

126k13 gold badges283 silver badges450 bronze badges

What is $v \, dp$ work and when do I use it?

Awarded Aug 27 at 14:12

Andrew Steane

55.9k3 gold badges78 silver badges226 bronze badges

Exact meaning of "$\pi/2$ pulse"

Awarded Aug 25 at 21:05

Ankit T

491 silver badge5 bronze badges

Deriving the Lagrangian for a free particle

Awarded Aug 22 at 14:00

nervxxx

4,3102 gold badges24 silver badges36 bronze badges

Modern references for continuum mechanics

Awarded Aug 21 at 3:22

Emilio Pisanty

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What criteria distinguishes causality from retrocausality?

Awarded Aug 20 at 17:45

Mike Battaglia

2332 silver badges7 bronze badges

How to understand the idea of functional renormalization group?

Awarded Aug 19 at 15:16

Qmechanic♦

193k43 gold badges507 silver badges2184 bronze badges

Synchronizing Pendulums

Awarded Aug 19 at 11:33

Edward Hughes

7,6681 gold badge44 silver badges80 bronze badges

CMB anisotropies and tightly coupled limit

Awarded Aug 18 at 13:04

user1318806

2162 silver badges5 bronze badges

Do all black holes have a singularity?

Awarded Aug 17 at 9:07

Florin Andrei

5,19819 silver badges30 bronze badges

Beam Splitter: looking for a "not-typical" second quantization but full-quantum description

Awarded Aug 16 at 13:28

Kevin Fischer

691 silver badge3 bronze badges

Auxiliary fields in supersymmetry

Awarded Aug 14 at 21:35

JeffDror

8,9262 gold badges28 silver badges72 bronze badges

What's the geometric (or representation independent) definition of central charge of Lie algebra $\mathfrak{g}$?

Awarded Aug 14 at 15:03

printf

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Is there a "more rigorous" derivation of the electrostatic boundary conditions?

Awarded Aug 13 at 12:51

Gold

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Understanding the Bloch sphere

Awarded Aug 12 at 18:10

Cosmas Zachos

58.8k6 gold badges98 silver badges234 bronze badges

How did Newton discover his second law?

Awarded Aug 11 at 1:20

Geremia

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Can energy conservation be derived from Newton's laws?

Awarded Aug 10 at 20:56

Jose Tomas

511 silver badge1 bronze badge

Is the sign of an amplitude in QFT meaningful?

Awarded Aug 9 at 8:28

Andrew

45.1k4 gold badges73 silver badges145 bronze badges

Fermions, different species and (anti-)commutation rules

Awarded Aug 9 at 7:47

Ryan Thorngren

7,8531 gold badge26 silver badges54 bronze badges

Why use coherent state path integral? What is its motivation or goal?

Awarded Aug 5 at 23:25

tparker

46.2k5 gold badges112 silver badges222 bronze badges

Fermionic Operator under time-reversal symmetry

Awarded Aug 1 at 22:16

Niall

1,0626 silver badges16 bronze badges

Do the Wightman axioms uniquely fix the representation of the Poincaré group on the one-particle states given the representation on the fields?

Awarded Aug 1 at 9:10

Valter Moretti

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Magnetic force on a triangular loop

Awarded Jul 31 at 19:16

Andrew Dynneson

1821 silver badge7 bronze badges

Motivation for isospin

Awarded Jul 30 at 21:45

Mass

1,8351 gold badge15 silver badges22 bronze badges

Liouville's theorem and conservation of phase space volume

Awarded Jul 26 at 11:10

honeste_vivere

15.4k4 gold badges37 silver badges132 bronze badges

Invariance of Lagrangian in Noether's theorem

Awarded Jul 26 at 3:10

user1379857

11.5k2 gold badges33 silver badges63 bronze badges

What is the Heisenberg-Weyl Algebra?

Awarded Jul 25 at 15:35

Valter Moretti

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When light reflects off a mirror, does the wave function collapse?

Awarded Jul 25 at 12:40

S. McGrew

24.6k3 gold badges29 silver badges74 bronze badges

Why don't get I shocked in an electric shower if the resistance makes contact with water?

Awarded Jul 24 at 20:41

xeeka

4093 silver badges6 bronze badges

If dark matter only interacts with gravity, why doesn't it all clump together in a single point?

Awarded Jul 20 at 5:48

ProfRob

126k13 gold badges283 silver badges450 bronze badges

Energy balance of closed timelike curves in Gödel's universe

Awarded Jul 19 at 10:04

orange_soda

1,3918 silver badges26 bronze badges

Why can't longitudinal waves be polarised?

Awarded Jul 13 at 5:09

Roger Vadim

56.8k7 gold badges57 silver badges192 bronze badges

Can you thermally pump a laser? (and problems with population inversion)

Awarded Jul 12 at 2:06

udrv

10.3k1 gold badge22 silver badges32 bronze badges

Integration constants in Maxwell's equations (ambiguousness?)

Awarded Jul 11 at 5:08

ProfRob

126k13 gold badges283 silver badges450 bronze badges

How imaginary part of susceptibility is measure of dissipation?

Awarded Jul 10 at 21:57

Merlin Zhang

1,5528 silver badges18 bronze badges

Entropy and gravity

Awarded Jul 10 at 13:32

Travis

1,70910 silver badges10 bronze badges

What's the connection between cosmic strings and the strings hypothesized in string theory?

Awarded Jul 9 at 12:41

Andrew Steane

55.9k3 gold badges78 silver badges226 bronze badges

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