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# [About me](/about)



I am an astrophysicist focusing on topics like cosmic plasmas, high-energy astrophysical phenomena, and computational physics.
I've also done some research on computer sciences, statistics, and machine learning.
For my research I use tools such as pen & paper and supercomputers.

From 2020 I'll start as a Flatiron Research Fellow in [CCA/Flatiron](https://www.simonsfoundation.org/flatiron/center-for-computational-astrophysics/) and Columbia University, (New York, USA).
Previously, I was a Nordita Fellow in [Nordic Institute for Theoretical Physics](http://www.nordita.org) (Stockholm, Sweden). 
I am also an avid open-source science & software advocate --- you can find my research and codes freely available from [GitHub](https://github.com/natj).


### Research 

I have a wide range of interdisciplinary research interests. These reflect some of my latest publications:

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- **High-energy astrophysics**: accretion (accretion disks); compact objects (neutron stars, black holes)
- **Plasma physics**: collisionless plasma dynamics; turbulence; particle acceleration
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- **Nuclear physics**: equation of state of cold ultra-dense neutron matter
- **General relativity**: ray tracing
- **Statistics**: Bayesian inference; Monte Carlo methods
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- **Computer sciences**: high performance computing; parallellization paradigms; machine learning; Julia language
- **Mathematics**: cellular automata models; topology
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<h4 style="margin-top: 0.2em; margin-bottom: 0.0em;"> Notes on physics (work-in-progress)</h4>
Most of these research notes are done in connection to some publication. If you want to cite these, let me know and I'll point you to a right paper.

- [Relativistic plasma physics](https://github.com/natj/notes-corpus/blob/master/plasma-physics/notes.pdf)
- [Digital filtering](https://github.com/natj/notes-corpus/blob/master/filtering/notes.pdf)
- [Introduction to neutron stars](https://github.com/natj/thesis) (my PhD thesis)


#### Teaching

- [CSC High-performance Summer School](https://www.csc.fi/en/web/training/-/csc_summerschool_2019)
    - latest materials from [2019](https://github.com/csc-training/summerschool)<commit_msg>add turbulence<commit_after>---
layout: home
image:
  feature: blackboard_large.jpg
permalink: /
title: " "
---

<img style="float: left; padding-right:50px;" src="images/jnattila_small.jpg">



# [About me](/about)



I am an astrophysicist focusing on topics like cosmic plasmas, high-energy astrophysical phenomena, and computational physics.
I've also done some research on computer sciences, statistics, and machine learning.
For my research I use tools such as pen & paper and supercomputers.

From 2020 I'll start as a Flatiron Research Fellow in [CCA/Flatiron](https://www.simonsfoundation.org/flatiron/center-for-computational-astrophysics/) and Columbia University, (New York, USA).
Previously, I was a Nordita Fellow in [Nordic Institute for Theoretical Physics](http://www.nordita.org) (Stockholm, Sweden). 
I am also an avid open-source science & software advocate --- you can find my research and codes freely available from [GitHub](https://github.com/natj).


### Research 

I have a wide range of interdisciplinary research interests. These reflect some of my latest publications:

<div class="inforow">
<div class="infocolumn" markdown="block">
- **High-energy astrophysics**: accretion (accretion disks); compact objects (neutron stars, black holes)
- **Plasma physics**: collisionless plasma dynamics; turbulence; particle acceleration
</div>
<div class="infocolumn" markdown="block">
- **Nuclear physics**: equation of state of cold ultra-dense neutron matter
- **General relativity**: ray tracing
- **Statistics**: Bayesian inference; Monte Carlo methods
</div>
<div class="infocolumn" markdown="block">
- **Computer sciences**: high performance computing; parallellization paradigms; machine learning; Julia language
- **Mathematics**: cellular automata models; topology
</div>
</div> <!-- /.inforow -->

---

<div class="inforow">

<div class="infocolumn2" markdown="block" style="background-color: #F0F0F0;">
<h4 style="margin-top: 0.2em; margin-bottom: 0.0em;"> Notes on physics (work-in-progress)</h4>
Most of these research notes are done in connection to some publication. If you want to cite these, let me know and I'll point you to a right paper.

- [Relativistic plasma physics](https://github.com/natj/notes-corpus/blob/master/plasma-physics/notes.pdf)
- [MHD turbulence](https://github.com/natj/notes-corpus/blob/master/turbulence/notes.pdf)
- [Digital filtering](https://github.com/natj/notes-corpus/blob/master/filtering/notes.pdf)
- [Introduction to neutron stars](https://github.com/natj/thesis) (my PhD thesis)


#### Teaching

- [CSC High-performance Summer School](https://www.csc.fi/en/web/training/-/csc_summerschool_2019)
    - latest materials from [2019](https://github.com/csc-training/summerschool)
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