S-parameter, Technimesons, and Phase Transitions in Holographic Tachyon DBI Models

Understand

We investigate some phenomenological aspects of the holographic models based on the tachyon Dirac-Born-Infeld action in the AdS space-time.

• These holographic theories model strongly interacting fermions and feature dynamical mass generation and symmetry breaking.
• We show that they can be viewed as models of holographic walking technicolor and compute the Peskin-Takeuchi S-parameter and masses of lightest technimesons for a variety of the tachyon potentials.
• We also investigate the phase structure at finite temperature and charge density.