My understanding is that mass, energy and space are all equivalent and that the energy of the photons is lost and goes to the curvature of space.
Probably I have this wrong, but some of the comments here don't correspond to my understanding of mainstream science - which is that to all...
Interesting, but in option 3 when a gas expands the work (PdV) done is done in 'pushing back' the surrounding atmosphere.
If there is nothing outside the expanding universe, then why should work be done in order for it to expand into nothing?
Most specifications ask for brief description, the evidence as nicksauce says, the age of the universe and its ultimate fate and how this depends on the amount of matter in the universe
We have interference in light.
we have stationary waves in all sorts of situations - light, sound water...
I have never heard of negative light
I have never heard of negative sound.
I have never heard of negative water waves.
Why do you think I should accept negative gravity from...
The original post is about
One wouldn't get interference patterns from stochastic (def: ruled by the laws of chance)sources wouldn't one?
The sources would have to be coherent.
ergo, unless one could achieve coherent sources (gravitationally phase linked) then a stationary gravitational...
I suspect that the book is referring not to something physical as per the milky way but 'space'. Matter cannot travel faster than the speed of light but 'space' can.
ergo, due to inflation, 'space' could well have been the size of the milky way - but the milky way wasn't there - yet! The Milky...
Don't think so, Space expands carrying all with it. The expansion we see now is just the dying embers of inflation and its scalar fields.
On top of that we have the peculiar motion of the heavenly bodies within it.
On the small scale, gravitational effects are far bigger than expansion of...
But surely one needs a 'standard candle' to determine Ho?
Cepheid variables work as do supernovae 1a.
Is there a standard candle black hole? ie a black hole that is equally bright (or dark?) no matter where it is in the universe?
Otherwise, surely it is not a matter of the photons 'not being...
Intense gravity wells etc have gravitational redshift. this will be added on to cosmological redshift.
IE a photon of light escaping a black hole, gains lots of gravitational potential energy. Since E = hf, its energy reduces, frequency reduces wavelength increases.
Gravitationally redshifted...
Whilst i appreciate that i am not at the high level of a PF mentor,
Surely the above cannot be correct.
If so how did inflation come about?
Space must expand at every level.
However, we have gravity too. this causes things to collapse.
There is a battle between expansion and...