Now showing items 5-8 of 553

• #### A lower bound on the positive semidefinite rank of convex bodies ﻿

The positive semidefinite rank of a convex body $C$ is the size of its smallest positive semidefinite formulation. We show that the positive semidefinite rank of any convex body $C$ is at least $\sqrt{\log d}$ where $d$ is ...
• #### Relativistic magnetised perturbations: Magnetic pressure versus magnetic tension ﻿

(IoP, 2018-05-16)
We study the linear evolution of magnetised cosmological perturbations in the post-recombination epoch. Using full general relativity and adopting the ideal magnetohydrodynamic approximation, we refine and extend the ...
• #### Gauge Mediation in the NMSSM with a Light Singlet: Sparticles within the Reach of LHC Run II ﻿

Relatively light stops in gauge mediation models are usually made compatible with the Higgs mass of 125 GeV by introducing direct Higgs-messenger couplings. We show that such couplings are not necessary in a simple and ...
• #### Interpreting the CMS ℓ+ ℓ-jj+ missing transverse energy excess with a leptoquark model ﻿

(2015-09-17)