Redshift Definition and 368 Threads

I have been reading in astrophysics that when light escapes a massive object its being slowed down by its gravity, but since it can't be slowed down its being redshifted. now in our high school physics books it says that light takes a diffrent path when its being slowed down when entering aother...

If light experiences gravitational redshift as said by GR, then, where did the difference between the initial and final energy, E = \frac {hc}{\lambda} go? From Hubble expansion, there is also redshift. Where did the energy difference go?

In my last Cosmology class, the professor explained how the expansion of the universe increase the wavelength of the light. But his explanation was a non-local one, I mean, you need to compare the time beween two wavecrests to determine that the light was redshifted. The explanation was that the...

All other issues aside, a mathemetician who is asked to explain cosmological redshift (more distant objects regularly appear redshifted) could easily come up with a couple of reasons: 1) the universe is expanding rapidly in all directions, and the light from distant galaxies is redshifted due...

If photons get redshifted on their way to the Earth by transferring energy to the dark energy of the cosmos their momenta would not be changed and cause blurring of objects because dark energy may not have momentum itself and so classical behaviour that would cause blurring would not...

As I understand it, light will be redshifted when it travels from a large ( gravitationally speaking ) object to us. It will also be redshifted if the object is moving away from us. How do we know how much of the redshift is due to either effect ? :confused:

when we use redshift to determine direction, velocity of distant radiation sources do we not take into account the redshift due to gravitational forces? that is, if gravitational fields can lengthen wavelengths of light (as well as bend them) wouldn't more distant objects like far off...

I came across Ned Wright's webpage http://www.astro.ucla.edu/~wright/tiredlit.htm which states that alternative explanations for the redshift of galaxies would not be consistent with the z-dependence of supernova lightcurves. However, this assertion is not further substantiated and as far as...

quote: ---------------------------------------------------------------------- Originally posted by shrumeo ... there has to be other data besides redshifting to confirm the expansion of the universe. I'd hate to know that so much theory is built on one type of data point...

Having only just learned of the existence of this board I feel that I should make use of it as i spend most of my free time working on seemingly useless theories, might as well see what others think. I have read a little on gravitational redshift but have never really understood the theory...

Redshift = expansion?? I'm not a physicist so I'll probably be laughed at for asking this. I understand the concepts of redshift and the Doppler effect being used to substantiate the hypothesis that the universe is expanding, indeed accelerating, since the farther an object is the higher its...

http://arxiv.org/abs/astro-ph/0203466 We present new spectroscopic observations of an old case of anomalous redshift--NGC 7603 and its companion. The redshifts of the two galaxies which are apparently connected by a luminous filament are z=0.029 and z=0.057 respectively. We show that in the...

Within the framework of General Relativity in one of its most simple forms, the Schwarzschild solution, a very interesting paradox can be proposed involving the conservation of work / energy. It’s a puzzle for the Relativity buff. In this short discussion I outline this energy redshift paradox...

About Time! This paper has such a obvious ring of truth about it, one can only hope that the misconceptions are finally laid to rest, and we can move forward, for there is Relativistic change in the air. http://uk.arxiv.org/abs/astro-ph/0310808 Here is an interesting paragraph:In special...

We have a theoretical issue here. There is a misconception floating around PF about the relation of the cosmological redshift to present and past recession velocity. If a redshift is Doppler in origin then in the context of Special Relativity one has Einstein's correction of the Doppler...

In the cosmol. redshift thread (Q) asked [[I would like to hear some interpretations of this phenomenon, especially in regards to what happens to the energy of photons in cosmological redshift – where do YOU think it goes? Is it lost or is it conserved?]] It is clear that a whole lot of...

I would like to hear some interpretations of this phenomenon, especially in regards to what happens to the energy of photons in cosmological redshift – where do YOU think it goes? Is it lost or is it conserved?

Can anyone explain to me the red shift