تقرير
Gravity- and temperature-driven phase transitions in a model for collapsed axionic condensates
| العنوان: | Gravity- and temperature-driven phase transitions in a model for collapsed axionic condensates |
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| المؤلفون: | Shukla, Sanjay, Verma, Akhilesh Kumar, Brachet, Marc E., Pandit, Rahul |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics Nonlinear Sciences |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics, Nonlinear Sciences - Pattern Formation and Solitons |
| الوصف: | We show how to use the cubic-quintic Gross-Pitaevskii-Poisson equation (cq-GPPE) and the cubic-quintic Stochastic Ginzburg-Landau-Poisson equation (cq-SGLPE) to investigate the gravitational collapse of a tenuous axionic gas into a collapsed axionic condensate for both zero and finite temperature $T$. At $T=0$, we use a Gaussian Ansatz for a spherically symmetric density to obtain parameter regimes in which we might expect to find compact axionic condensates. We then go beyond this Ansatz, by using the cq-SGLPE to investigate the dependence of the axionic condensate on the gravitational strength $G$ at $T = 0$. We demonstrate that, as $G$ increases, the equilibrium configuration goes from a tenuous axionic gas, to flat sheets or $\textit{Zeldovich pancakes}$, cylindrical structures, and finally a spherical axionic condensate. By varying $G$, we show that there are first-order phase transitions, as the system goes from one of these structures to the next one; we find hysteresis loops that are associated with these transitions. We examine these states and the transitions between these states via the Fourier truncated cq-GPPE; and we also obtain the thermalized $T > 0$ states from the cq-SGLPE; the transitions between these states yield thermally driven first-order phase transitions and their associated hysteresis loops. Finally, we discuss how our cq-GPPE approach can be used to follow the spatiotemporal evolution of a rotating axionic condensate and also a rotating binary-axionic-condensate system; in particular, we demonstrate, in the former, the emergence of vortices at large angular speeds $\Omega$ and, in the latter, the rich dynamics of the mergers of the components of this binary system, which can yield vortices in the process of merging. Comment: 13 pages, 8 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevD.109.063009 |
| URL الوصول: | http://arxiv.org/abs/2311.01769 |
| رقم الأكسشن: | edsarx.2311.01769 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevD.109.063009 |
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