A Description of the Particle Horizon
Types of Horizon Hubble Sphere Backup Slides
The Horizon Problem
A Description of the Particle Horizon
Micah Andrew Thornton
Southern Methodist University Physics
April 25, 2016
Micah Andrew Thornton
A Description of the Particle Horizon
Outline
Types of Horizon Hubble Sphere Backup Slides
The Horizon Problem
1 Types of Horizon
Particle Horizon
Mathematical Description Physical Relevance
Event Horizon
Mathematical Description Physical Relevance
2 Hubble Sphere
Mathematical Description Relation to Redshift Parameter (z)
3 Backup Slides
4 The Horizon Problem
Cosmic Background Radiation The Resolution (Cosmic Inflation)
Micah Andrew Thornton
A Description of the Particle Horizon
Types of Horizon Hubble Sphere Backup Slides
The Horizon Problem
Types of Horizon
Particle Horizon Event Horizon
There are three main types of horizons that will be discussed in this talk:
1 The Particle Horizon 2 The Event Horizon 3 The Hubble Sphere * Although not Technically a horizon
Micah Andrew Thornton
A Description of the Particle Horizon
Types of Horizon Hubble Sphere Backup Slides
The Horizon Problem
Horizon Background
Particle Horizon Event Horizon
"The range of perception or experience"
Comoving distance A measure of distance in astronomy, based on proper distance This measure `factors out' the expansion of the universe
t dt X = c?
te a(t )
Conformal time
A measure of time based on the comoving distance
This is the measure that will allow us to formally define the
particle horizon.
t dt =
0 a(t )
Micah Andrew Thornton
A Description of the Particle Horizon
Types of Horizon Hubble Sphere Backup Slides
The Horizon Problem
The Particle Horizon
Particle Horizon Event Horizon
"The present distance of an object emitting light at [a specific point in time]"
The particle horizon at a specific time t
Relative to an arbitrary observer
is given by a sphere of radius equivalent to the comoving
distance.
t dt = c?
te a(t )
Micah Andrew Thornton
A Description of the Particle Horizon
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