<p>In the textbook introduction to cosmology by Barbara Ryden, the author say that the energy density of the inflaton field is:</p>
<p><span class="math-container">$$\epsilon_{\phi} = \frac{\dot{\phi^2}}{2 \hbar c^3} + V(\phi)$$</span></p>
<p>However, she doesn't really explained how she get that expression. It is obvious? What am I missing?</p>
<p>Thanks</p>

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2024-03-11T07:38:16.453Z
There may be a detailed explanation in the books and articles of Andrei Linde (Stanford University), if I'm not mistaken.
ayr
<cosmology><cosmological-inflation><potential-energy>
Energy density of the inflaton field
merlinbluepickle
# Energy density of the inflaton field

(Asked by: username_0 on 2024-03-10)

In the textbook introduction to cosmology by Barbara Ryden, the author say that the energy density of the inflaton field is:

$$\epsilon\_{\phi} = \frac{\dot{\phi^2}}{2 \hbar c^3} + V(\phi)$$

However, she doesn't really explained how she get that expression. It is obvious? What am I missing?

Thanks

**Tags:** cosmology, cosmological-inflation, potential-energy
> **Comments:**
> **username_1**: There may be a detailed explanation in the books and articles of Andrei Linde (Stanford University), if I'm not mistaken.  

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## 0 answers

