Search

We discuss the role of quarks and baryons near the QCD phase transition. The former is modelled in the spirit of PNJL model, while the latter is splitted into two classes: “stringy” and “non-stringy” baryons. We represent the non-stringy baryons by a sum over the resonance on equal footing, and obtain the density of states of stringy baryons from string inspired model at finite-T. Our model produce a rise and fall of baryonic contribution to the susceptibility, which is in qualitative agreement with lattice results. We also discuss the chiral effect on the baryonic mass and susceptibility. [ABSTRACT FROM AUTHOR]

We face the issue of SUSY breaking and mediation in the KKLT scenario. We model the compact CY space, in the vicinity of a throat, as a 5d warped space, thus neglecting the compact dimensions transverse to the throat. We adopt an effective field theory approach, and build a model with a warped extra dimension bounded by a UV brane, where the visible sector is located, and an IR brane, where the SUSY breaking sector is located. From the string perspective the latter is the bottom of the throat, the first the “rest” of the CY space, to which the throat is glued. We study the mediation of SUSY breaking between the branes, and show that there is an effect due to extra massive bulk vector fields, which are expected in the KKLT model. Such an effect competes with the so-called “modulus-anomaly” mediation. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]