نوع مقاله : مقاله پژوهشی کامل
نویسندگان
1 دانشکده فیزیک، پردیس علوم، دانشگاه تهران، تهران، ایران
2 دانشکده فیزیک، پردیس علوم ، دانشگاه تهران، تهران، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
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. 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]