fleshed out the introductory sections

references.bib

@@ -16,7 +16,7 @@
 
 
 
-
+### The three main THESAN papers
 
 @article{Kannan_2021,
    title={Introducing the <scp>thesan</scp> project: radiation-magnetohydrodynamic simulations of the epoch of reionization},
@@ -29,10 +29,8 @@
    publisher={Oxford University Press (OUP)},
    author={Kannan, R and Garaldi, E and Smith, A and Pakmor, R and Springel, V and Vogelsberger, M and Hernquist, L},
    year={2021},
-   month=dec, pages={4005–4030} }
-
-
-
+   month=dec, pages={4005–4030}
+}
 @article{Garaldi_2022,
    title={The<scp>thesan</scp>project: properties of the intergalactic medium and its connection to reionization-era galaxies},
    volume={512},
@@ -44,9 +42,8 @@
    publisher={Oxford University Press (OUP)},
    author={Garaldi, E and Kannan, R and Smith, A and Springel, V and Pakmor, R and Vogelsberger, M and Hernquist, L},
    year={2022},
-   month=feb, pages={4909–4933} }
-
-
+   month=feb, pages={4909–4933}
+}
 @article{Smith_2022,
    title={The<scp>thesan</scp>project: Lyman-α emission and transmission during the Epoch of Reionization},
    volume={512},
@@ -58,4 +55,65 @@
    publisher={Oxford University Press (OUP)},
    author={Smith, A and Kannan, R and Garaldi, E and Vogelsberger, M and Pakmor, R and Springel, V and Hernquist, L},
    year={2022},
-   month=mar, pages={3243–3265} }
+   month=mar, pages={3243–3265}
+}
+
+
+
+
+### Beorn specific
+# original beorn paper
+@article{Schaeffer_2023,
+   title={<scp>beorn</scp>: a fast and flexible framework to simulate the epoch of reionization and cosmic dawn},
+   volume={526},
+   ISSN={1365-2966},
+   url={http://dx.doi.org/10.1093/mnras/stad2937},
+   DOI={10.1093/mnras/stad2937},
+   number={2},
+   journal={Monthly Notices of the Royal Astronomical Society},
+   publisher={Oxford University Press (OUP)},
+   author={Schaeffer, Timothée and Giri, Sambit K and Schneider, Aurel},
+   year={2023},
+   month=sep, pages={2942–2959} }
+
+
+# theoretical foundation - halo model of reionization
+@misc{schneider2023cosmologicalforecast21cmpower,
+      title={Cosmological forecast of the 21-cm power spectrum using the halo model of reionization},
+      author={Aurel Schneider and Timothée Schaeffer and Sambit K. Giri},
+      year={2023},
+      eprint={2302.06626},
+      archivePrefix={arXiv},
+      primaryClass={astro-ph.CO},
+      url={https://arxiv.org/abs/2302.06626},
+}
+
+
+
+
+
+
+# Wouthuysen-Field effect
+@ARTICLE{Wouthuysen,
+       author = {{Wouthuysen}, S.~A.},
+        title = "{On the excitation mechanism of the 21-cm (radio-frequency) interstellar hydrogen emission line.}",
+      journal = {\aj},
+         year = 1952,
+        month = jan,
+       volume = {57},
+        pages = {31-32},
+          doi = {10.1086/106661},
+       adsurl = {https://ui.adsabs.harvard.edu/abs/1952AJ.....57R..31W},
+      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
+}
+
+@ARTICLE{Field,
+  author={Field, George B.},
+  journal={Proceedings of the IRE},
+  title={Excitation of the Hydrogen 21-CM Line},
+  year={1958},
+  volume={46},
+  number={1},
+  pages={240-250},
+  keywords={Hydrogen;Clouds;Electromagnetic wave absorption;Kinetic theory;Equations;Deuterium;Temperature distribution;Observatories;Electrons;Atomic measurements},
+  doi={10.1109/JRPROC.1958.286741}}