Observational Constraints on the Modified Gravity Model (MOG) Proposed by Moffat: Using the Magellanic System

A simple model for the dynamics of the Magellanic Stream (MS), in the framework of modified gravity models is investigated. We assume that the galaxy is made up of baryonic matter out of context of dark matter scenario. The model we used here is named Modified Gravity (MOG) proposed by Moffat (2005). In order to examine the compatibility of the overall properties of the MS under the MOG theory, the observational radial velocity profile of the MS is compared with the numerical results using the $\chi^2$ fit method. In order to obtain the best model parameters, a maximum likelihood analysis is performed. We also compare the results of this model with the Cold Dark Matter (CDM) halo model and the other alternative gravity model that proposed by Bekenstein (2004), so called TeVeS. We show that by selecting the appropriate values for the free parameters, the MOG theory seems to be plausible to explain the dynamics of the MS as well as the CDM and the TeVeS models.Comment: 14 pages, 3 Figures, accepted in Int. J. Theor. Phy

Separation as an important risk factor for suicide: A systematic review

Examining how different phases of relationship separation effects the development of suicidal behaviors has been largely ignored in suicide studies. The few studies conducted suggest that individuals experiencing the acute phase of marital/de facto separation may be at greater risk of suicide compared with those experiencing long-term separation (divorce). To clarify the effects of these factors on detection and prevention of suicidal behaviors, a critical review of the English-language literature on this topic from 1966 to 2008 was undertaken. No studies reliably indicate the impacts of acute separation versus long-term divorce on suicidality. Moreover, research has not specifically addressed the interaction between the psychosocial factors influencing suicidal behaviors in the context of a marital/de facto separation. Considering the large proportion of suicides that occur in the context of marital/de facto separation, our limited understanding of the factors involved in the development of these suicidal behaviors is of concern