Note on the Radion Effective Potential in the Presence of Branes

In String Theory compactification, branes are often invoked to get the desired form of the radion effective potential. Current popular way of doing this assumes that the introduction of branes will not modify the background geometry in an important way. In this paper, we show by an explicit example that at least in the codimension 2 case, the gravitational backreaction of the brane cannot be neglected in deriving the radion effective potential. Actually, in this case, the presence of branes will have no effect on the dynamics of radion.Comment: 6 pages, no figures. Some discussion clarified, conclusion unchanged. To appear in Phys. Rev.

Gravitational potential in Palatini formulation of modified gravity

General Relativity has so far passed almost all the ground-based and solar-system experiments. Any reasonable extended gravity models should consistently reduce to it at least in the weak field approximation. In this work we derive the gravitational potential for the Palatini formulation of the modified gravity of the L(R) type which admits a de Sitter vacuum solution. We conclude that the Newtonian limit is always obtained in those class of models and the deviations from General Relativity is very small for a slowly moving source.Comment: 5 pages, no figure

Why Experienced Incivility Triggers Instigated Incivility: Combining the Affect-based and Resource-based Pathways

Ever since Andersson and Pearson\u27s seminal work (1999), incivility has become one of the most commonly studied forms of mistreatment in the organizational sciences (Hershcovis, 2011). While research to date has yielded significant findings about the effects of experienced incivility, far less is known about the underlying mechanisms that linked experienced incivility and instigated incivility. Among the limited studies investigating the positively relationship between experienced incivility and instigated incivility, two distinct theoretical frameworks, affective-based perspective and resource-based, were drew upon. And these two perspectives have never been examined in the same model. To this end, I investigated negative affect (affect-based mechanism) as well as rumination and mental fatigue (resource-based mechanism) as parallel mediators of the relationship between experienced incivility and instigated incivility. I also examined the moderating role of hostile attribution bias in the first stage of the parallel mediation. Using longitudinal design, the current study supported only the affect-based pathway but not the resource-based one. The study also found surprising results regarding the role of hostile attribution bias. Implications and future directions were discussed