Richard Galvez

On the sign problem in 2D lattice super Yang-Mills

A bstractIn recent years a new class of supersymmetric lattice theories have been proposed which retain one or more exact supersymmetries for non-zero lattice spacing. Recently there has been some controversy in the literature concerning whether these theories suffer from a sign problem. In this paper we address this issue by conducting simulations of the

Supersymmetry, nonthermal dark matter, and precision cosmology

\mathcal{N}

Phase structure of lattice

= (2, 2) and

\mathcal{N}=4

\mathcal{N}

super Yang-Mills

= (8, 8) supersymmetric Yang-Mills theories in two dimensions for the U(N ) theories with N = 2, 3, 4, using the new twisted lattice formulations. Our results provide evidence that these theories do not suffer from a sign problem in the continuum limit. These results thus boost confidence that the new lattice formulations can be used successfully to explore non-perturbative aspects of four-dimensional

Realization of Center Symmetry in Two Adjoint Flavor Large-N Yang-Mills

\mathcal{N}

Non-Abelian gauged Nambu–Jona-Lasinio models on the lattice

= 4 supersymmetric Yang-Mills theory.

Cosmology with independently varying neutrino temperature and number

Within the minimal supersymmetric Standard Model (MSSM), LHC bounds suggest that scalar superpartner masses are far above the electroweak scale. Given a high superpartner mass, nonthermal dark matter is a viable alternative to WIMP dark matter generated via freezeout. In the presence of moduli fields, nonthermal dark matter production is associated with a long matter-dominated phase, modifying the spectral index and primordial tensor amplitude relative to those in a thermalized primordial universe. Nonthermal dark matter can have a higher self-interaction cross section than its thermal counterpart, enhancing astrophysical bounds on its annihilation signals. We constrain the contributions to the neutralino mass from the bino, wino and Higgsino using existing astrophysical bounds and direct detection experiments for models with nonthermal neutralino dark matter. Using these constraints we quantify the expected change to inflationary observables resulting from the nonthermal phase.

Center Symmetry Restoration with 2 Flavor Large N Yang-Mills in the Adjoint Representation.

A bstractWe make a first study of the phase diagram of four-dimensional

Supersymmetric gauge theories on the lattice: Pfaffian phases and the Neuberger 0=0 problem

\mathcal{N}=4