The Theoretical high energy, astroparticle and gravitational physics is a large section with a variety of research interests.

We have around 45 members, including permanent faculty, non-permanent faculty, postdocs and PhD students. In addition we have a number of affiliate professors and emeritus professors that contribute to the section as well.

The Niels Bohr institute has many M.Sc. and PhD students. The students are closely attached to the research groups and supervisor, and have many social activities for International and Danish students.

If you are interested in studying Particle Physics and Cosmology, consider looking at these pages:

• Sc. in Physics, study track in theoretical particle physics and cosmology, courses etc.
• Sc. in Physics, study track in experimental particle physics, courses etc.
• Sc. in Physics with specialization in Astrophysics, courses etc.

General information about the education, application, living in Denmark etc.

The main themes of our research are:

Theoretical particle physics:

The theoretical framework of Particle physics is Quantum Field Theory, on which we have several experts. We explore exciting new theoretical techniques in computing scattering amplitudes that aim to revolutionize our understanding of Quantum Field Theory as a framework of particle physics, and possibly replace it with an entirely new formulation. Furthermore, we use these and other methods to study the phenomenology of particle physics for use in predictions for particle accelerators.

Gravity, gravitational waves and black holes:

Classical gravity (i.e. gravity without quantum effects included) is formulated successfully by Einsteins theory of General Relativity. This theory explains fascinating physical phenomena such as black holes and gravitational waves. We study the powerful new techniques to compute gravitational waves using methods developed for particle physics scattering amplitudes. This is important for future measurements of gravitational waves. We study extensions of General Relativity (e.g. in higher-dimensions, with cosmological constant, and to non-relativistic geometries) and correspondences between gravity and fluid physics. Furthermore, regarding black holes we study theoretical aspects of astrophysical phenomena such as jet-physics and black hole shadows.

Theoretical high-energy physics:

In theoretical high-energy physics we consider the most fundamental building blocks of nature. The central goal is to unify the theory of gravity, namely General Relativity, with the theory of particle physics, i.e. Quantum Field Theory. A highly successful modern approach to this is the Holographic Principle as formulated by the AdS/CFT correspondence. This correspondence is formulated in the framework of String Theory and M-theory. We have several experts in our section working on these topics and more. Among the fields of study are quantum gravity, the quantum nature of black holes, and integrable models.

Astroparticle physics:

Our research interests lie at the boundary between fundamental physics, astrophysics and cosmology. We focus on weakly interacting particles, such as the Neutrino, cosmic rays and gamma-rays. Those particles are abundantly produced in the most energetic astrophysical events, ranging from supernovas and neutron-star mergers to active galactic nuclei, as well as in the Early Universe. We aim at unveiling the nature of those particles, and at using them as probes of the inner working of a range of astrophysical sources and our Universe.  

• Publications: Theoretical high energy, astroparticle and gravitational physics