ASTR 103 Lecture Notes - Lecture 26: Cosmic Microwave Background, Cosmic Background Radiation, Edwin Hubble

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School
Department
Course
Professor
Edwin&Hubble-1929
Discovery&of&increasing&galactic&recession,&i.e.&"Expanding&universe"&and&the&
development&of&Hubble's&Law
-
Wilson&and&Penzias-1964
Discovery&of&Cosmic&Microwave&Background&Radiation.&The&"Echo&of&the&Big&
Bang"
-
Background&Radiation&Explorations
Measuring&with&increasing&accuracy&the&differences&in&the&temperature&of&the&
Big&Bang's&remnant&radiant&heat
-
Cosmic&Microwave&Background&Radiation
3&K&Black&body&spectrum
-
Isotropic-almost
-
Singularity&(or&really&really&small)&
Start&hot,&expand&and&cool
-
Space&expands
Matter&goes&along&for&the&ride
-
Major&stages&during&the&formation&of&the&universe
Big&bang&(more&of&a&whimper)
Recombination
Cosmic&background&radiation
Everything&before&this&point&is&speculation
§
Neural&hydrogen&forms&(earliest&stars&form)
Big&bang-quantum&functions&-inflation&-protons&formed&-nuclear&fusion&
begins&-nuclear&fusion&ends&-cosmic&microwave&background&-neutral&
hydrogen&forms&-modern&universe
-
The&Universe&(as&we&know&it)
72%&dark&energy&(only&vague&ideas&about&this)
-
23%&dark&matter&(we&have&some&promising&ideas,&and&some&experiments&to&test&
these&ideas)
-
4.6%&atoms&(the&part&that&we&understand&well)
-
*95%&of&the&universe&is&made&up&of&stuff&we&don't&understand!
-
The&universe&is&accelerating,&not&decelerating
Dark&energy&is&the&energy&that&is&causing&the&universe&to&continue&to&
expand&and&accelerate
-
Geometry&of&the&Universe
Spherical
Positive&curvature-an&equilateral& triangle&would&exhibit&corners&with&
angles&>&60&degrees
-
Hyperbolical&(saddle&shaped)
Negative&curvature-an&equilateral&triangle&would&exhibit&corners&with&
angles&<&60&degrees
-
Flat
An&equilateral&triangle&would&exhibit&corners&with&angles&=&60&degrees
-
Critical&density&is&the&average&density&of&matter&required&for&the&universe&to&halt&
its&expansion&after&an&infinite&amount&of&time
-
Our&universe&is&most&likely&in&a&black&hole,&along&with&many&other&universes
5.6-The(Big(Bang
Friday,&November& 17,&2017
10:27&AM
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