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coconut
  • Member for 5 years, 9 months
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78 votes
Accepted

What does one second after big bang mean?

72 votes
Accepted

How far away are we from probing Planck scale physics directly?

36 votes
Accepted

Do all waves of any kind satisfy the principle of superposition?

33 votes

Would a gas "weigh" less than a liquid if they have the same mass?

15 votes
Accepted

Why $3$-dim isotropic harmonic oscillator's symmetry is not $O(6)$ but $U(3)$?

13 votes
Accepted

Understanding gauge fields as connections on a principal G-bundle

11 votes
Accepted

What is wrong with a nonrenormalizable theory?

8 votes
Accepted

Tensor product vs. Cartesian Product for composite quantum systems

6 votes
Accepted

What do imaginary numbers practically represent in the Schrödinger equation?

5 votes

Why are derivatives in interaction terms treated differently from derivatives in the kinetic term?

5 votes

How many quantum fields are there?

5 votes
Accepted

Electrons moving faster than light and backward in time?

5 votes
Accepted

Clashing definition of rays in Weinberg and Sakurai and Born interpretation without normalizability

4 votes

Properties of the field lines of an irrotational vector field

4 votes

Spin operators in QM

4 votes
Accepted

Are laws of physics (mechanics) symmetric under uniform rotation?

4 votes

Rigorous definition of the variation

4 votes
Accepted

Off-shell QFT from on-shell amplitudes

3 votes
Accepted

What is the maximum number of linearly independent density matrices in a 2D space?

3 votes

Can the Lagrangian of an effective field theory have higher derivative terms?

3 votes

What is meant by a vector representation?

3 votes

Why does space have the topology of a three sphere?

3 votes

Connection between homotopic maps from $X\to Y$ and homotopic paths in $Y$ in the context of SU(2) Yang-Mills instantons

3 votes
Accepted

Higher-Order Derivatives in the Lagrangian

3 votes
Accepted

System of combined observables presented as tensor products

3 votes

How can we be certain our world has only three spatial dimensions?

3 votes
Accepted

Is everything relative? Length and time?

3 votes

Can charged scalar have non-zero vev?

3 votes

Constants of motion from a Lagrangian

2 votes

What are Hamilton's equations with respect to a nonstandard symplectic form?