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Apogee
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37
Difference between regularization and renormalization?
Jun 18, 2014
13
What is the geometrical interpretation of Ricci tensor?
Jan 7, 2014
9
Why Galilean spacetime is not $\mathbb{E}^4$?
Feb 5, 2015
9
Deriving the photon Propagator
Nov 7, 2016
8
Deriving photon propagator
Sep 27, 2014
6
Raising index of variation
Oct 29, 2016
6
Why a Killing vector field is needed to judge positive/negative frequencies?
Oct 10, 2017
4
Physical Interpretation for Schwinger and Hadamard functions
Apr 5, 2015
4
Discrepancy in the form of the free Klein-Gordon field
Oct 21, 2016
3
Can someone explain intuitively how, for a Galilean universe, $A^4$ is equivalent to $\Bbb{R} \times \Bbb{R}^3$?
Mar 23, 2015
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9
Why use open sets in definitions?
6
Union of uncountable measurable sets is bounded?