can you compute the scale factor $a$ at which a $\Lambda$CDM-cosmology has a total deceleration of zero? is there an equivalent more general result for dark energy components with a constant dark energy equation of state parameter $w$?
Wednesday, May 27, 2015
Wednesday, May 20, 2015
Wednesday, May 13, 2015
the astronauts of Apollo 14 measured the surface gravity of the Moon with a pendulum. of course you could argue that all of that was faked, that the experiment was carried out on Earth and that the footage was shown in slow motion. by how much would everything need to be slowed down? would there be another experiment like the golf ball shot by the same Apollo 14 astronauts or the dropped hammer and feather from Apollo 15 that would convince you?