نوع مقاله : مقاله پژوهشی کامل
نویسندگان
1 دانشکده فیزیک، پردیس علوم، دانشگاه تهران
2 دانشکده فیزیک دانشگاه تهران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
In ths article, we study the extended scalar-tensor Gauss-Bonnet. First, we review a model in which there is a coupling between the Gauss-Bonnet scalar and the scalar field. Then we extend the model to a hybrid model with two scalar fields. We study the conditions under which the solutions are unstable and spontaneous scalarization occurs. In this case we have non trivial solutions for the scalar fields. We show that the coupling coefficients in the hybrid state and in the presence of a scalar field are asymptotically the same but the sufficient condition of instability is different between these two models. ٌ
کلیدواژهها [English]
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