تقرير
Symmetry breaking and the onset of cosmic acceleration in scalar field models
| العنوان: | Symmetry breaking and the onset of cosmic acceleration in scalar field models |
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| المؤلفون: | Sadjadi, H. Mohseni, Honardoost, M., Sepangi, H. R. |
| المصدر: | Phys. Dark Univ. 14 (2016) 40-47 |
| سنة النشر: | 2015 |
| المجموعة: | General Relativity and Quantum Cosmology High Energy Physics - Theory |
| مصطلحات موضوعية: | General Relativity and Quantum Cosmology, High Energy Physics - Theory |
| الوصف: | We propose a new scenario for the onset of positive acceleration of our Universe based on symmetry breaking in coupled dark energy scalar field model. In a symmetry breaking process where the scalar field rolls down its own potential, the potential reduction is not in favor of acceleration. In our model, when dark matter density becomes less than a critical value, the shape of the effective potential is changed and, the quintessence field climbs up along {\it{its own potential}} while rolls down the effective potential. We show that this procedure may establish the positivity of the potential required for the Universe to accelerate. In addition, we show that by choosing an appropriate interaction between dark sectors there is the possibility that the scalar field resides in a new vacuum giving rise to a positive cosmological constant which is responsible for a permanent late time acceleration. Comment: 14 pages, 5 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1016/j.dark.2016.09.004 |
| URL الوصول: | http://arxiv.org/abs/1504.05678 |
| رقم الأكسشن: | edsarx.1504.05678 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1016/j.dark.2016.09.004 |
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