Skip to main content

Explore our questions

0 votes
1 answer
304 views

How should two-photon transitions be modelled? Is second-order perturbation theory required? Or are sequential first-order processes sufficient?

0 votes
1 answer
25 views

Why is the potential energy of an element in a string not a negative value?

3 votes
2 answers
111 views

Energy balance in adiabatic demagnetization

2 votes
1 answer
30 views

Gaussian integration with operator-valued sources and time ordering

5 votes
3 answers
326 views

How do we define time-ordering operations in QFT?

0 votes
2 answers
269 views

Lorentz transformation sign convention confusion

2 votes
1 answer
36 views

Is topology change possible in Einstein's general theory of relativity?

3 votes
2 answers
1k views

Does "Crack The Whip" actually speed you up?

0 votes
1 answer
19 views

Electric potential

7 votes
2 answers
2k views

Should the energy-momentum tensor be invariant under gauge transformations?

1 vote
1 answer
319 views

How to choose sign/direction of momenta in Feynman diagrams?

2 votes
1 answer
407 views

Thermodynamic potentials without unconstrained variables?

5 votes
1 answer
543 views

Conformally invariant theory. Relationship between conformal transformations and conformal rescaling (Weyl scaling)

-2 votes
1 answer
38 views

Leveraging mercury's depression in a capillary for a siphon (and potentially a capillary engine!!)?

Browse more Questions