This question might be a result of perceptual ignorance but still:
In explaining an inflationary cosmological model that postulates a prime singularity (i.e. starting with a Big Bang) some tend to associate it with "dots on an inflating balloon". Doesn't this imply that the "dots" that are...
So what I understand is that if there hypotheticaly IS some sort of energy shift going on, it lies well within the current observational error? If so, can't this effect stack up in, say, x->infinity lensing events? i.e. a photon slowly snaking through billions of light years of variable...
The basic question is: will a photon traveling through a vacuum lose some of its energy due to interactions with gravity from a massive body?
Gravitational lensing implies that the photon will change its initial direction but is its energy conserved (i.e. differences in blueshift/redshift...