Speaker
Mohamed Younes Sassi
(Tsung-Dao Lee Institute, Shanghai Jiao Tong University)
Description
We propose a new mechanism for dark matter genesis, Defect-Mediated Conversion (DMC). Cosmological domain walls–generic remnants of spontaneously broken discrete symmetries–can host a scalar condensate in their core that acts as a portal between the Standard Model and a dark sector: thermal-bath fermions crossing the wall are partially and non-thermally converted into dark particles. The mechanism can yield the correct abundance of dark matter for a large mass range from the keV Lyman-α floor and up to orders of magnitude above the wall formation scale and is more efficient than standard Freeze-In mechanism for the same Yukawa couplings.
Authors
Dr
João Paulo Pinheiro
(Tsung-Dao Lee Institute, Shanghai Jiao Tong University)
Mohamed Younes Sassi
(Tsung-Dao Lee Institute, Shanghai Jiao Tong University)