699 reputation
622
bio website
location United Kingdom
age
visits member for 3 years, 6 months
seen Dec 7 at 18:05

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.


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?
Mar
9
accepted Finding the correct units for the energy-momentum tensor?