Scale-Invariant Two Component Dark Matter

We study a scale invariant extension of the standard model which can explain simultaneously dark matter and the hierarchy problem. In our set-up, we introduce a scalar and a spinor as two-component dark matter in addition to scalon field as a mediator. Interesting point about our model is that due to scale invariant conditions, compared to other two-component dark matter models, it has lower independent parameters. Possible astrophysical and laboratory signatures of two-component dark matter candidate are explored and it is shown that the most contribution of observed relic density of dark matter can be determined by spinor dark matter. Detectability of these dark matter particles is studied and the direct and invisible Higgs decay experiments are used to rule out part of the parameter space of the model. In addition, the dark matter self-interactions are considered and shown that their contribution saturate this constraint in the resonant regions.Comment: 22 pages, 14 figure

Impact of Torsion Space-Time on ttˉt\bar{t} observables at Hadron Colliders

Starting from the effective torsion space-time model, we study its effects on the top pair production cross section at hadron colliders. We also study the effect of this model on top pair asymmetries at the Tevatron and the LHC. We find that torsion space-time can explain forward-backward asymmetry according to measured anomaly at Tevatron. We find an allowed region in the parameters space which can satisfy simultaneously all $t\bar{t}$ observables measured at Tevatron and LHC.Comment: 17 pages, 6 figures. arXiv admin note: substantial text overlap with arXiv:1207.064

Probing the top quark chromoelectric and chromomagnetic dipole moments in single top tWtW-channel at the LHC

We study the effects of chromoelectric and chromomagnetic dipole moments (CEDM and CMDM) on the production cross section of single top $tW$-channel at the LHC based on the effective Lagrangian approach. We show that the impact of CEDM and CMDM could be large. Using the experimental measurement of the $tW$-channel cross section, constraints on CEDM and CMDM are extracted. These constraints are comparable with the ones obtained from the top pair analysis.Comment: 13 pages, 4 figure

Effective ways to lower Muslim immigrant students\u27 anxiety in ESL classes: A handbook for educators

ABSTRACT This field project is a handbook for educators that recommends effective ways of lowering Muslim refugee students\u27 anxiety in ESL classrooms. Schools are challenging for refugee and immigrant students as they have to navigate school systems that do not accommodate their unique needs. As a result, Muslim refugee students are often discriminated against, marginalized, and bullied in schools. They suffer from low self-confidence, high anxiety, and lack of motivation. Research concludes that educational institutions in host countries are ill-equipped in creating an equitable education and school environment for Muslim refugee students due to the lack of educators’ training and the flawed association between assimilation and educational success. Among refugee students, anxiety is known to negatively affect learning and to impede academic success. In this field project, educators are provided with (a) a brief description of Islam; (b) information on pre-settlement experiences of refugees; (c) recommendations on how to create a safe learning environment for these students; (d)a lesson plan designed to bring awareness to non-Muslim students in the classroom and honor Muslim students\u27 culture. I hope this project assists educators in recognizing the impact of pre-settlement experiences on Muslim refugee students’ post-settlement academic success and their social mobility. Furthermore, I believe this project can be instrumental in addressing discriminatory practices and curricula in US public schools

CAREER: advanced temperature compensation techniques for integrated bulk-mode micro and nano mechanical resonators

Issued as final reportNational Science Foundation (U.S.