<p>Is the acceleration of expansion we observe with supernovae direct or is this an interpretation according <span class="math-container">$\Lambda$</span>CDM model ?</p>

<p>I mean what we observe is luminosity distance versus redshift, so to see acceleration we should have scale factor vs time, which need a model, right (assuming Friendmann-Lemaître equations in which we need to consider homogenous universe for example) ?</p>

<p>Is it possible to say "our universe is in accelerated expansion" without any  interpretation with a model ?</p>

CC BY-SA 4.0
2018-09-26T14:44:58.400Z
Supernova brightness vs redshift.
Wayfaring Stranger
CC BY-SA 4.0
2018-09-28T13:44:14.600Z
Redshift of line emission
Kornpob Bhirombhakdi
<universe><supernova><expansion><observable-universe>
Is the acceleration of the expansion of the universe a direct observation or an interpretation?
AlbertBranson
# Is the acceleration of the expansion of the universe a direct observation or an interpretation?

(Asked by: username_0 on 2018-09-26)

Is the acceleration of expansion we observe with supernovae direct or is this an interpretation according $\Lambda$CDM model ?

I mean what we observe is luminosity distance versus redshift, so to see acceleration we should have scale factor vs time, which need a model, right (assuming Friendmann-Lemaître equations in which we need to consider homogenous universe for example) ?

Is it possible to say "our universe is in accelerated expansion" without any interpretation with a model ?

**Tags:** universe, supernova, expansion, observable-universe
> **Comments:**
> **username_1**: Supernova brightness vs redshift.  
> **username_2**: Redshift of line emission  

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## 0 answers

