I'm trying to write a `xaringan`

presentation that has some latex equations. This is what I wrote:

```
---
output:
xaringan::moon_reader:
lib_dir: libs
nature:
highlightStyle: github
highlightLines: true
highlightSpans: true
countIncrementalSlides: false
ratio: "16:9"
---
# Model without clusters
Let $y_i$ be the standardized outcome for student $i$:
$$
y_i \sim N(\mu_i,\sigma) \\
\sigma \sim N^+(0,1) \\
\mu_i = \alpha + \eta T_i + \beta X_i \\
\eta \sim N(0,1) \\
\beta \sim N(0,1)
$$
```

Alas, `\\`

is not recognized as a line break so I end up with this:

What am I doing wrong?