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Hubbles lov og det kosmologiske princip

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by Troels Kollerup Jensen on 25 August 2013

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Transcript of Hubbles lov og det kosmologiske princip

Hubbles lov og det kosmologiske princip
Hubbles lov
Ligning for Hubbles lov
Steady State eller Big Bang?
Hubbles opdagelse førte til forskellige modeller
Steady State = stabil tilstand
Big Bang = Store brag

Hubbletiden To
Det kosmologiske princip
Universet er jævnt og ensartet
Stoffet i universet er jævnt fordelt -> lige mange galakser, som indeholder ens mængder af samme type stjerner.

Er det kosmologiske princip bevist?
Hubbles lov understøtter at Universet er isotropt

Forklaring på Hubbles lov

Universet er isotropt -> naturlovene

Opfattelse af universet
Edwin Bubble 1923
Galakser består af millioner af stjerner
Galakses hastighed
Proportional med dens afstand

v = Ho * r

Ho = Hubblekonstanten
v = galaksens hastighed væk fra os
r = galaksens afstand
Mly = millioner lysår
Ho=22 (km/s)/Mly
Beregning om at der er gået ca. 14 milliarder år siden Big Bang.
To = r/v
Indsætter udtrykket fra Hubbles lov på v.
To = r/Ho*r = 1/Ho
Dvs. To = 13,7 milliarder år

1. Universet er homogent (ensartet)

2. Universet er isotropt (alle steder i Universet er ligeværdige)
Naturlovene ens overalt i universet
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