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111 votes
4 answers
15k views

Intuitively, why are bundles so important in Physics?

88 votes
5 answers
95k views

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

59 votes
6 answers
31k views

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

48 votes
4 answers
10k views

What's the real fundamental definition of energy?

36 votes
1 answer
3k views

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

36 votes
3 answers
3k views

What is the issue with interactions in QFT?

35 votes
7 answers
7k views

What is Quantum Mechanics really about? [duplicate]

34 votes
7 answers
5k views

Is there something behind non-commuting observables?

32 votes
4 answers
5k views

Physical and Geometrical interpretation of Differential Forms

31 votes
4 answers
16k views

What exactly is a virtual displacement in classical mechanics?

28 votes
3 answers
3k views

Representing forces as one-forms

26 votes
1 answer
449 views

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

23 votes
5 answers
21k views

Maxwell's Equations using Differential Forms

23 votes
3 answers
2k views

How are symmetries precisely defined?

23 votes
4 answers
5k views

Why are particles in Quantum Mechanics indistinguishable?

21 votes
4 answers
7k views

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

17 votes
2 answers
781 views

Existence of the Unruh effect

16 votes
3 answers
2k views

How one uses the definition of observers in General Relativity?

16 votes
3 answers
9k views

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

16 votes
1 answer
1k views

Is purification physicaly meaningful?

15 votes
2 answers
502 views

Why do we need to embed particles into fields?

15 votes
7 answers
4k views

Motivation for tensor product in Physics

15 votes
1 answer
2k views

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

14 votes
7 answers
986 views

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

14 votes
3 answers
7k views

What actually means to compute things at tree level?

14 votes
6 answers
686 views

Temperature is always the average of some quantity?

13 votes
2 answers
757 views

Is there a general meaning for a Quantum Field?

13 votes
2 answers
3k views

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

13 votes
3 answers
2k views

How to motivate Schrödinger's Equation? [duplicate]

13 votes
2 answers
3k views

How to understand Feynman's reasoning about perpetual motion?

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