761 reputation
622
bio website
location United Kingdom
age
visits member for 3 years, 9 months
seen 12 hours ago

Manual worker. Live in England. Formal scientific education "peaked" many years ago when I failed maths and chemistry A-level and scraped a bare pass in physics. Still enjoy pottering about in maths and physics.


Mar
4
accepted How to tell if a star is in a galaxy?
Nov
22
accepted Derivation of the Riemann tensor confusion
Nov
17
accepted Is this covariant derivative identity true?
Oct
24
accepted Geodesic deviation equation - why does the ordinary second derivative give the correct answer?
Aug
28
accepted Which of these two textbook equations of geodesic deviation is correct?
Jun
5
accepted Minkowski metric and definition of coordinate differentials?
Dec
19
accepted Riemann curvature tensor symmetries confusion
Sep
9
accepted Index raising and lowering - how does it work?
Jul
13
accepted Derivation of freely falling frame in Schwarzschild spacetime
Jun
5
accepted Einstein-de Sitter - confusing constant of integration
May
29
accepted Kronecker delta confusion
Jan
22
accepted Is this interpretation of $\psi=\frac{1}{\sqrt{\pi a^{3}}}e^{-r/a}$ correct?
Jan
15
accepted Calculation of spherical Bessel functions - meaning of $\left(\frac{1}{x}\frac{d}{dx}\right)^{l}$
Dec
31
accepted Don't understand the integral over the square of the Dirac delta function
May
7
accepted Zero divergence of energy-momentum tensor and gravitational energy
Apr
26
accepted Confusion regarding geodesic of thrown ball - curved or Cartesian coordinates?
Apr
8
accepted Hubble time, the age of the Universe and expansion rate
Apr
7
accepted How does the critical density decide the fate of the Universe?
Apr
3
accepted Very basic question about empty universe
Mar
31
accepted Why doesn't dark energy vary with time?