Tuesday, April 14, 2015

"Variations in the speed of light"

More and more physicists are willing to consider that the speed of light may be changing, as predicted. From phys.org:

Physicists propose method to measure variations in the speed of light

"But in some alternative theories of cosmology, the speed of light is not actually constant, but varies throughout time and space."

The physicists from universities in Poland and Spain propose to use baryon acoustic oscillations, waves in the microwave background that can theoretically be detected and measured. Their pasper appears, behind a paywall, in Physical Review Letters:

Measuring the speed of light with baryon acoustic oscillations

The article in phys.org mentions a simple relationship: There is an angular diameter distance Da, which can be multiplied by the Hubble factor H to get the speed of light:

DaH = c

We can calculate Da, the maximum distance light has travelled from the time of highest redshift. M = R = t in Planck units, which in CGS units becomes: GM = tc^3 and R = ct

c(t) = (GM)^[1/3]t^[-1/3]

Da = \int c(t)dt = (3/2)(GM)^[1/3]t^[2/3] integrated from t = 0 (the Big Bang) to the present time.

Note that (GM)^[1/3]t^[-1/3] = c, so:

Da = (3/2)ct

Now we figure out the Hubble value H = Rdot/R

R(t) = ct = (GM)^[1/3]t^[2/3]

\Rdot(t) = (2/3)(GM)^[1/3]t^{-1/3]

H = \Rdot /R = (2/3t)

Putting it all together:

DaH = (3/2)ct(2/3t) = c

Matches perfectly, no? A simple cosmology of M = R = t fits the relation DaH = c. Why hasn't anyone noticed this before?


Anonymous Anonymous said...

Okay. Been reading about gravity and light. That math is way beyond me. but i keep reading about computers, speeds of light, and particles. One thing doesnt make sense to me...please help. If light passes a black hole and cant escape, doesnt that in turn mean that light is slowed by gravity? But when light reaches a point where its path towards the black hole is certain, shouldnt the gravity of the black hole speed light up continuously until it reaches? And light doesnt drive by a black hole and go, nope, not gonna make it and gets sucked back. How? If the gravity is that strong, wouldnt light dedicate its path towards the black hole before light had a chance to pass? To me, it seems light just goes faster and faster as its pulled. Am i way off here? Or do i have a point? Curious, cause i have more to say, but wont just yet...

4:55 AM  
Blogger mahjong said...

Really impressive post. I read it whole and going to share it with my social circules. I enjoyed your article and planning to rewrite it on my own blog.
mahjong | agario | minecraft | kizi | hulk games | mickey mouse games | sniper games | pacman

12:34 AM  
Blogger Online Guitar Lessons said...

Physics is a very nice and beneficent subject to study and this subject provides us a lot of beneficent and precious knowledge about where can i buy essays online. Every student try to take it as a special subject.

12:57 AM  
Blogger Riya Jacob said...

Such a nice post ! great love to read this one.

mumbai escorts
mumbai escorts
mumbai escorts
mumbai escorts

11:00 PM  
Anonymous Grace said...

I see the greatest contents on your blog and I extremely love reading them. nice guitar

12:50 AM  
Blogger Mincecraft Games said...

Very good write-up. I certainly love this site. Keep writing!
- minecraft games
- happy wheels
- happy wheels
- tetris
- brain games
- puzzle games
- agario hi
- abcya

3:44 PM  
Anonymous Friv4 said...

When you're tired, you want to relax after a stressful working hours, you need to have time to take care of the kids active.
Please visit our website and play exciting flash games.
Thanks you for sharing!
Friv 4

6:38 PM  
Blogger Regina Hilary said...

This is the best application on the drop today. There access to enjoy great moments of relaxation . Great! Thanks for sharing the information.Summon creatures to fight enemy units and demolish the opposing castle. Your castle is equipped with a crossbow, which you can use to shoot enemies . Make sure you upgrade skills to increase your chances of winning battles.:
age of war 2 | age of war 5 | age of war 6 | age of war 4

The goal of Age of War is to survive longer than the computer and to outlast him you’ll need to train the right troops while balancing your offence and defence in this high paced, quick thinking flash game . Train troops of you own to combat the computers. As you kill off the computer troops, you will gain EXP and you will eventually advance to the next age. unfair mario
age of war 3 | age of war | unfair mario 2 | cubefield | happy wheels | tank trouble

12:05 AM  
Blogger hoa pikey said...

A good blog. Thanks for sharing the information. It is very useful for my future. keep sharing
duck life 3 | Slither io |Red Ball 3 |
red ball 2| gmail sign in| Gmail login|

11:08 PM  
Blogger Thuy Trang said...

Eu não sou bom, então eu não entendo de física. Eu sou uma pessoa que gosta de viajar e fotografia. A câmera que é o telefone mais conveniente, eu baixei o aplicativo baixar retrica e baixar b612 para o meu telefone. Usar, prático, tenho belas fotos simples para postar em redes sociais baixar facebook , baixar facebook

10:29 PM  
Blogger Jordan Ovilia said...

This is the game is played so great. Invite you to experience it interesting things there.
strike force heroes 4 | red ball | slitherio
gun mayhem 2 | c an your pet | happy wheels
strike force heroes 4 | red ball | slitherio
strike force heroes 4 | fireboy and watergirl 2
tank trouble 2 | free online games
hotmail sign in | hotmail login

5:04 PM  
Blogger hường lê said...

Such a very useful article. Very interesting to read this article.I would like to thank you for the efforts you had made for writing this awesome article.

Discover our website bounty of free online games now!
Our website has the biggest collection of free online games. Totally new games are added every day!

age of War
gold Miner
unfair Mario
tanki Online

3:52 PM  
Blogger Alice Denny said...

I was working and suddenly I visits your site frequently and recommended it to me to read also. Age Of War 2
Big Farm | Slitherio
Tank Trouble | Happy Wheels
Goodgeme Empire | Slither.io

10:21 PM  
Blogger yoob games said...

Very good write-up. I certainly love this site. Keep writing!
play hére:
العاب طبخ جديدة

8:45 PM  

Post a Comment

Links to this post:

Create a Link

<< Home

Locations of visitors to this page