User Gold

111 votes

4 answers

15k views

Intuitively, why are bundles so important in Physics?

asked Sep 15, 2013 at 1:37

88 votes

5 answers

95k views

What do spacelike, timelike and lightlike spacetime interval really mean?

special-relativity spacetime metric-tensor causality

asked Mar 11, 2015 at 3:19

59 votes

6 answers

31k views

Is Biot-Savart law obtained empirically or can it be derived?

electromagnetism magnetic-fields

asked Jun 8, 2013 at 17:58

48 votes

4 answers

10k views

What's the real fundamental definition of energy?

classical-mechanics energy work definition

asked Apr 1, 2013 at 19:28

36 votes

1 answer

3k views

What does it mean to say that "the fundamental forces of nature were unified"?

quantum-field-theory forces grand-unification unified-theories

asked Aug 20, 2016 at 20:53

36 votes

3 answers

3k views

What is the issue with interactions in QFT?

quantum-field-theory mathematical-physics hilbert-space interactions

asked May 2, 2017 at 20:46

35 votes

7 answers

7k views

What is Quantum Mechanics really about? [duplicate]

quantum-mechanics quantum-information

asked Sep 1, 2015 at 2:15

34 votes

7 answers

5k views

Is there something behind non-commuting observables?

quantum-mechanics quantum-information heisenberg-uncertainty-principle commutator observables

asked Feb 29, 2016 at 3:46

32 votes

4 answers

5k views

Physical and Geometrical interpretation of Differential Forms

classical-mechanics differential-geometry resource-recommendations education

asked Mar 3, 2013 at 17:39

31 votes

4 answers

16k views

What exactly is a virtual displacement in classical mechanics?

classical-mechanics lagrangian-formalism definition constrained-dynamics displacement

asked Aug 6, 2014 at 18:16

28 votes

3 answers

3k views

Representing forces as one-forms

mathematical-physics differential-geometry vectors

asked Feb 24, 2013 at 2:01

26 votes

1 answer

449 views

Is the converse of Weinberg's statement on the cluster decomposition principle true?

quantum-mechanics quantum-field-theory mathematical-physics scattering s-matrix-theory

asked Jul 13, 2018 at 13:39

23 votes

5 answers

21k views

Maxwell's Equations using Differential Forms

electromagnetism special-relativity differential-geometry maxwell-equations

asked Nov 14, 2013 at 10:19

23 votes

3 answers

2k views

How are symmetries precisely defined?

lagrangian-formalism symmetry group-theory

asked Feb 11, 2014 at 13:03

23 votes

4 answers

5k views

Why are particles in Quantum Mechanics indistinguishable?

quantum-mechanics identical-particles

asked Mar 2, 2016 at 3:30

21 votes

4 answers

7k views

Why is the partition function divided by $(h^{3N} N!)$?

statistical-mechanics partition-function identical-particles

asked May 19, 2015 at 23:41

17 votes

2 answers

781 views

Existence of the Unruh effect

general-relativity vacuum research-level qft-in-curved-spacetime unruh-effect

asked Jun 9, 2017 at 1:26

16 votes

3 answers

2k views

How one uses the definition of observers in General Relativity?

general-relativity special-relativity reference-frames definition observers

asked Mar 28, 2017 at 17:07

16 votes

3 answers

9k views

How to "derive" the wave equation without refering to strings?

waves

asked Apr 7, 2014 at 21:41

16 votes

1 answer

1k views

Is purification physicaly meaningful?

quantum-mechanics hilbert-space quantum-information density-operator

asked Aug 21, 2018 at 15:29

15 votes

2 answers

502 views

Why do we need to embed particles into fields?

quantum-field-theory particle-physics field-theory second-quantization s-matrix-theory

asked Jul 5, 2018 at 0:37

15 votes

7 answers

4k views

Motivation for tensor product in Physics

mathematical-physics tensor-calculus

asked Nov 7, 2013 at 17:25

15 votes

1 answer

2k views

How to make rigorous the idea of a continuous complete set?

quantum-mechanics mathematical-physics hilbert-space dirac-delta-distributions

asked Oct 2, 2015 at 14:15

14 votes

7 answers

986 views

How can a set of components fail to make up a vector?

differential-geometry vectors tensor-calculus vector-fields covariance

asked Mar 4, 2015 at 2:18

14 votes

3 answers

7k views

What actually means to compute things at tree level?

quantum-mechanics quantum-field-theory feynman-diagrams propagator s-matrix-theory

asked May 17, 2017 at 0:09

14 votes

6 answers

686 views

Temperature is always the average of some quantity?

thermodynamics statistical-mechanics temperature

asked Sep 10, 2016 at 23:27

13 votes

2 answers

757 views

Is there a general meaning for a Quantum Field?

quantum-field-theory operators

asked Oct 11, 2016 at 23:01

13 votes

2 answers

3k views

Why the Galileo transformation are written like this in Quantum Mechanics?

quantum-mechanics operators reference-frames phase-space galilean-relativity

asked Jun 24, 2017 at 23:59

13 votes

3 answers

2k views

How to motivate Schrödinger's Equation? [duplicate]

quantum-mechanics schroedinger-equation

asked Dec 12, 2014 at 23:57

13 votes

2 answers

3k views

How to understand Feynman's reasoning about perpetual motion?

newtonian-mechanics energy-conservation perpetual-motion

asked Sep 17, 2013 at 23:14

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409 Questions

Intuitively, why are bundles so important in Physics?

What do spacelike, timelike and lightlike spacetime interval really mean?

Is Biot-Savart law obtained empirically or can it be derived?

What's the real fundamental definition of energy?

What does it mean to say that "the fundamental forces of nature were unified"?

What is the issue with interactions in QFT?

What is Quantum Mechanics really about? [duplicate]

Is there something behind non-commuting observables?

Physical and Geometrical interpretation of Differential Forms

What exactly is a virtual displacement in classical mechanics?

Representing forces as one-forms

Is the converse of Weinberg's statement on the cluster decomposition principle true?

Maxwell's Equations using Differential Forms

How are symmetries precisely defined?

Why are particles in Quantum Mechanics indistinguishable?

Why is the partition function divided by $(h^{3N} N!)$?

Existence of the Unruh effect

How one uses the definition of observers in General Relativity?

How to "derive" the wave equation without refering to strings?

Is purification physicaly meaningful?

Why do we need to embed particles into fields?

Motivation for tensor product in Physics

How to make rigorous the idea of a continuous complete set?

How can a set of components fail to make up a vector?

What actually means to compute things at tree level?

Temperature is always the average of some quantity?

Is there a general meaning for a Quantum Field?

Why the Galileo transformation are written like this in Quantum Mechanics?

How to motivate Schrödinger's Equation? [duplicate]

How to understand Feynman's reasoning about perpetual motion?