### Speaker

Bob Holdom

### Description

A scalar field theory with 4-derivative kinetic terms and 4-derivative cubic and quartic couplings is presented as a proxy for quadratic gravity. Unitarity and positivity appear as the key issues in the scalar field theory, just as they do in quadratic gravity. We have extended some calculations to show how these issues are resolved in the high energy limit of the theory. The results also show how it is that differential cross sections can have good high energy behaviour.

### External references

- 23100006
- 38024815-39b1-4eed-a980-0d4d3dfb2cdf
- 2f45a1ae-3aad-423a-aef1-02d6c9f92a2a