Tuesday, March 13, 2012

Happy 3.14!


Albert Einstein's birthday is easy for mathematicians to remember, March 14 or 3.14! The Einstein-de Sitter Universe has a "critical" density of (6 $\pi$G t^2)^(-1), a density that keeps it from collapsing or expanding without bounds. Scientists long wondered why the density is exactly this, invoking strange ideas like "inflation" to explain it.

A cosmology where GM=tc^3 actually predicts that the "critical" density is in fact the stable density. If the Universe were less than this density, matter would be created via pair production until this density were reached. For a 4-dimensional spherical Universe of mass M, initial density is just (2 $\pi$^2 G t^2)^(-1). Difference between initial and final density is the difference between 3 and $\pi$ or 4.507034%. The density of baryonic matter that has been measured by the WMAP spacecraft may be precisely predicted from pure math.

Ancient Greek mathematicians first thought that the ratio between a circle's circumference and diameter was exactly 3, then later wondered why it should be an irrational number like 3.14. Fortunately $\pi$ does not equal 3, or the matter that we are made of would not exist!

Labels: ,

3 Comments:

Blogger Unknown said...

20151022 junda
coach factory outlet online
Abercrombie & Fitch Factory Outlet
louis vuitton outlet
Michael Kors Outlet Online No Tax
oakley sunglasses
ugg boots outlet
Buy Kobe Shoes Online Discount
ray ban sunglasses
Ugg Boots,Ugg Boots Outlet,Ugg Outlet,Cheap Uggs,Uggs On Sale,Ugg Boots Clearance,Uggs For Women
true religion jeans
cheap ugg boots
michale kors outlet
Gucci Outlet Online Sale
Coach Factory Outlet Stores 70% off
celine
Christian Louis Vuitton Red Bottoms
louis vuitton outlet
ugg boots sale
air max 90
Oakley Vault Outlet Store Online
air max 95,nike golf,nike janoski,air max 1,nike canada,nike plus,nike shox,nike factory store
coach outlet online
michael kors outlet stores
canada goose outlet
canada goose outlet
Coach Factory Handbags Outlet Store
michael kors handbag
Hollister Clothes for Girls Website
Louis Vuitton Handbags Discount Off
coach factory outlet

7:33 PM  
Blogger Unknown said...

riofriospacetime an interesting blog that is quite useful for jual crystal x di bekasi cara mengobati keputihan yang gatal jual crystal x asli nasa jual obat gatal pada selangkangan

9:14 PM  
Blogger xjd7410@gmail.com said...

burberry outlet
oakley vault
longchamp bags
polo ralph shirts
christian louboutin shoes
louis vuitton outlet
ray ban wayfarer
louis vuitton handbags
celine outlet
michael kors outlet
toms shoes
adidas ultra boost
coach factory outlet
hermes handbags
vans shoes outlet
michael kors handbags
gucci handbags
coach factory outlet
coach factory outlet
adidas originals shoes
gucci outlet
cheap oakleys
burberry outlet online
michael kors outlet
adidas ultra boost
oakley sunglasses
jordan retro
toms outlet
oakley sunglasses
polo ralph lauren outlet
louis vuitton outlet
ralph lauren
true religion jeans
nike nfl jerseys
jordans
louis vuitton handbags
coach factory outlet
jeremy scott shoes
louis vuitton handbags
cheap oakley sunglasses
2016.7.28haungqin

5:44 PM  

Post a Comment

<< Home

Locations of visitors to this page