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kalle's user avatar
kalle's user avatar
kalle
  • Member for 5 years, 7 months
  • Last seen more than a week ago
  • Zürich, Switzerland
7 votes
3 answers
3k views

Age of Universe from Friedmann Equation - How to actually solve the integral?

5 votes
4 answers
441 views

Why does the chain yield in nuclear fission sum up to 200%?

3 votes
1 answer
449 views

$cGh$-Physics Cube: When Do (General) Relativistic / Quantum Effects Become Relevant?

3 votes
0 answers
98 views

How to expand conformal normal ordering / operator product expansion?

2 votes
1 answer
69 views

Why can the commutator of a general expression be replaced by the anti-commutator in the $bc$ CFT theory?

2 votes
0 answers
70 views

Computer code to quickly check equation of motion to first or higher order from action (4D spacetime)

2 votes
2 answers
111 views

When Do Gravitational Effects Become Relevant?

2 votes
1 answer
163 views

Infinite Redshift in Schwarzschild Solution: What would you actually "see"?

2 votes
1 answer
261 views

Milky Way Density

2 votes
2 answers
592 views

Physical Interpretation of d'Alembert Operator

1 vote
1 answer
107 views

Density and Gravity in expanding Universe

1 vote
1 answer
124 views

number of photons per area: after reflection != twice the distance

1 vote
1 answer
680 views

Forming a Neutron Star: inverse $\beta^-$ decay or electron capture?

1 vote
1 answer
298 views

Equation of Motion from Lagrangian: Expand the Lagrangian by orders of perturbation to get higher order equation of motion?

1 vote
0 answers
55 views

Higher Order Equation of Motions from Lagrangian / Action

1 vote
0 answers
95 views

Equation of Motion from Action for a Scalar Field + Matter

0 votes
2 answers
86 views

Perturbation of Equations of Motion - Can I Simplify by Using Order 0?

0 votes
1 answer
36 views

Charged Black Hole: Self-Discharge

0 votes
0 answers
51 views

Numerical Approximation of the CMB Anisotropy Monopole $\Theta_0$ and the Scalar Metric Perturbation $\psi$

0 votes
0 answers
31 views

When does a theory decouple?

0 votes
0 answers
31 views

Number of Isotopes created with decay <-> Chain Yield

0 votes
1 answer
378 views

Potts model equivalent to Heisenberg model

0 votes
1 answer
295 views

Thomson's Plum Pudding and Rutherford's scattering [duplicate]

0 votes
1 answer
130 views

Why is it better to accelerate electrons in a linear collider?

0 votes
0 answers
106 views

Why does the wind close doors?

0 votes
2 answers
390 views

Maxwell Equations in Friedman-Robertson-Walker metric

0 votes
1 answer
75 views

Energy Equation of an ideal gas in expanding space-time