23rd International Conference From the Planck scale to the Electroweak scale (Planck 2021)

Session

Beyond the Standard Model

Jun 28, 2021, 1:40 PM

6. Axion Strings in the Sky

Prateek Agrawal

6/28/21, 1:40 PM

I will present some remarkable signals of axion strings coupled to photons. There are compelling theoretical motivations to expect axion strings that persist in the sky today. There is a model-independent polarization rotation of CMB photons in the string background, equal to $\alpha_{em}$ up to a rational number related to the fundamental unit of electromagnetic charge. This manifests itself...

4. Bounce of Nothing

Isabel Garcia Garcia

6/28/21, 4:20 PM

5. Amplitudes for Monopoles

Ofri Telem

6/28/21, 5:10 PM

On-shell methods are particularly suited for exploring the scattering of electrically and magnetically charged objects, for which there is no local and Lorentz invariant Lagrangian description. In this paper we show how to construct a Lorentz-invariant S-matrix for the scattering of electrically and magnetically charged particles. A key ingredient is a revision of our fundamental understanding...