# Distribution of mass - from decoupling to present

1. Jul 21, 2012

### Loren Booda

Distribution of mass -- from decoupling to present

How has subatomic particle homogeneity changed since cosmological redshift Z=1000? How much have particles maintained their relative positions to present?

I am reminded of the calculation that concludes we have molecules of air in our lungs shared by notorious persons throughout human history. If we are stardust, from what sectors of the universe do our atoms come from?

2. Jul 22, 2012

### BobG

Re: Distribution of mass -- from decoupling to present

A more interesting question is how many of the molecules of our brain are the original molecules we were born with?

3. Jul 22, 2012

### Loren Booda

Re: Distribution of mass -- from decoupling to present

Don't our bodies (besides teeth) recycle every ~7 years?

4. Jul 22, 2012

### BobG

Re: Distribution of mass -- from decoupling to present

It's still something strange to ponder. Our memories are older than our bodies - yet we grow old.

Everything important lies in the patterns; not the matter itself.

5. Jul 22, 2012

### denjay

Re: Distribution of mass -- from decoupling to present

I think the obvious conclusion is that memories are stored in our teeth.

6. Jul 22, 2012

### Staff: Mentor

Re: Distribution of mass -- from decoupling to present

No wonder I forgot my password after getting my wisdom teeth removed...

7. Jul 22, 2012

### Loren Booda

Re: Distribution of mass -- from decoupling to present

If two hydrogen atoms are contiguous at Z=1000, what is the farthest apart they could be now?

8. Sep 16, 2013

### Mk

What does Z=1000 exactly mean?

9. Sep 16, 2013

### Staff: Mentor

I thought it was how many times the observable universe had doubled in size since the emission of the CMB, but I'm not sure.

10. Sep 16, 2013

### Office_Shredder

Staff Emeritus
Why do you think they're called wisdom teeth?

11. Sep 16, 2013

### Enigman

Z is a dimensionless quantity describing red-shift given by Z=(femit - fobs)/fobs
Z=1089 corresponds to the red-shift of cosmic micro-wave background - greatest distance and furthest back in time
Z=0 refers to the present time.
http://en.wikipedia.org/wiki/Redshift

12. Sep 17, 2013

### Mk

Ah. Ok. I've seen that before.

I would assume that the particles haven't moved, but that the distance in between them has homogeneously increased.

Obviously there are many levels of position-changing higher order effects.