**It goes without saying that finding answers to questions raised by the Standard Model and General Relativity remains a huge part of theoretical physics. Recent developments in bimetric theory, a topical review ****published in Journal of Physics A: Mathematical and Theoretical is the second most most highly cited article in the journal from 2016. ****Here we talk to one of the authors of the review, Angnis Schmidt-May, from Ludwig-Maximilians-Universität München, ****to discover why this field is so active and what discoveries she’d like to see.**

**What is your review about?
**

The review is about massive spin-2 fields and their interactions with gravity. These interactions extend general relativity and are described by a bimetric theory, i.e. a field theory involving two symmetric tensor fields.

**What attracted you to this field? **

It deals with very fundamental physics and aims to answer basic questions about field theory. At the same time, we might actually be able to observe massive spin-2 particles in nature and the theory could be testable. I am fascinated by the possibility of predicting a new particle by working on fundamental theory.

**Why is this area so active at the moment?**

For a long time it was believed that no consistent description of massive spin-2 fields exists and only a few years ago the opposite was shown. We transitioned from a no-go theorem to a well-defined theory that can make predictions for gravitational physics and cosmology. The field is thus relatively new and there are still many areas to explore.

**Where do you see the field going?**

I hope that the field will continue to grow and attract more young researchers. Hopefully, we will be able to understand the theory for massive spin-2 fields in a larger context, such as string theory or supergravity.

**What discoveries would you most like to see?
**

In the best case, the effects of a massive spin-2 field will be observed in cosmological or astrophysical phenomena, gravitational wave experiments or through local tests of gravity. Any signal would be a real breakthrough.

**What are you working on now?**

Recently, I have been mostly interested in massive spin-2 particles as dark matter candidates. But I also continue to work on developing a better understanding of the fundamental structure of bimetric theory.

We thank Angnis for publishing in the journal and taking the time to answer our questions.

**Read More:**

Recent developments in bimetric theory

Structures in multiple spin-2 interactions

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

Picture of Angnis Schmidt-May owned by Timur Delahaye, used with permission. Coupling image from Angnis Schmidt-May and Mikael von Strauss 2016 *J. Phys. A: Math. Theor.* **49** 183001 © 2016 IOP Publishing Ltd.

Categories: Journal of Physics A: Mathematical and Theoretical