Residual meson-meson interaction from lattice gauge simulation in a simple QED model

The residual interaction for a meson-meson system is computed utilizing the cumulant, or cluster, expansion of the momentum-space time correlation matrix. The cumulant expansion serves to define asymptotic, or free, meson-meson operators. The definition of an effective interaction is then based on a comparison of the full (interacting) and the free (noninteracting) time correlation matrices. The proposed method, which may straightforwardly be transcribed to other hadron-hadron systems, here is applied to a simple 2+1 dimensional U(1) lattice gauge model tuned such that it is confining. Fermions are treated in the staggered scheme. The effective interaction exhibits a repulsive core and attraction at intermediate relative distances. These findings are consistent with an earlier study of the same model utilizing L\"{u}scher's method where scattering phase shifts are obtained directly.Comment: 28 pages, compressed postscript fil

Brasileiro gosta de "muvuca"?: impacto da densidade humana no comportamento de compra

This study investigated how the changes in human density in stores affect the consumers’ perception of crowding and satisfaction. Two experiments were conducted to test how shoppers behave in different levels of store crowding, moderated by the variables: familiarity, acumen towards the store aesthetics, and consumers’ income. The moderation tests indicated that while higher familiarity reduces the negative responses to crowding, higher levels of aesthetic acumen have an opposite effect. The results indicated non-significant differences in consumers’ responses between the low and medium stores human density levels, but showed a substantial increase of negative responses between the medium and high density level. The results indicated non-significant differences between lower and upper income responses. This paper brings not only managerial suggestions, but offers a significant contribution to a better understanding and integration of conceptual frameworks about the crowding phenomenon, and suggests many avenues for further investigation

Reassessing the effect of colour on attitude and behavioural intentions in promotional activities: The moderating role of mood and involvement

The present research examines the effect of background colour on attitude and behavioural intentions in various promotional activities taking into consideration the moderating role of mood and involvement. Three experiments reflecting different promotional activities (window display, consumer trade show, guerrilla marketing) were conducted for this purpose. Overall, findings indicate that cool background colours, in contrast to warm colours, induce more positive attitudes and behavioural intentions mainly in positive mood, and low involvement conditions. Implications are also discussed