# 3rd Year Special Projects in 2015

### Particle Theory/Cosmology: Deriving Newton’s law of gravitation from quantum gravity

Supervisor: |
Dr Archil Kobakhidze |

Contact: |
Dr Archil Kobakhidze |

Email: |
archilk AT physics.usyd.edu.au |

Phone: |
(02) 9351 5349 |

The nature is believed to be fundamentally relativistic and quantum. That is, the familiar classical laws must be derivable from more fundamental relativistic quantum theories. In this project we quantise Einstein’s relativistic theory of gravitation (General Relativity) and derive Newton’s law of universal gravitation from it.

### Particle Theory/Cosmology: Thermal Newton’s law of universal gravitation

Supervisor: |
Dr Archil Kobakhidze |

Contact: |
Dr Archil Kobakhidze |

Email: |
archilk AT physics.usyd.edu.au |

Phone: |
(02) 9351 5349 |

Within the quantum theory of gravity the Newtonian gravitational force is known to emerge due to the exchange of quanta of gravitational field, known as gravitons. Assuming that gravitons are in thermal equilibrium with the surrounding environment, we derive thermal correction to the Newtonian law of universal gravitation.

### Particle Theory/Cosmology: Thermal Newton’s law of universal gravitation

Supervisor: |
Dr Michael Schmidt |

Contact: |
Dr Michael Schmidt |

Email: |
michael.schmidt AT sydney.edu.au |

Phone: |
(02) 9351 3810 |

Several different astrophysical and cosmological observations at vastly different length scales indicate the existence of a new form of matter, dark matter (DM), which is about 5 times more abundant than ordinary matter. It does not interact with light and its existence has only been inferred from its gravitational interactions. The origin and the nature of DM is unknown, but it is commonly believed to be explained by one or more new particles. In this project you will study the production of multi-component dark matter.