I am starting my honours project on colliding plane gravitational waves and I am learning about the Petrov-Penrose classification of the Weyl tensor. I can't find any good explanation on what a principal null direction is.(adsbygoogle = window.adsbygoogle || []).push({});

Thanks

Chris

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# What is a principal null direction

Loading...

Similar Threads for principal null direction |
---|

I Coordinate and proper time, null geodesic |

I Geometric meaning of complex null vector in Newman-Penrose |

B What speed and direction are we actually traveling? |

A Interpretation of covariant derivative of a vector field |

I Principal null directions |

**Physics Forums | Science Articles, Homework Help, Discussion**