| Name: | Sanjay Shukla |
| Affiliation: | Indian Institute of Science |
| Conference ID : | ASI2024_377 |
| Title : | Gravity- and temperature-driven phase transitions in a model for collapsed axionic condensates |
| Authors : | Sanjay Shukla, Akhilesh Kumar Verma, Marc E. Brachet, Rahul Pandit |
| Authors Affiliation: | 1. Sanjay Shukla, Rahul Pandit: Department of Physics, Indian Institute of Science, Bangalore 560012, India
2. Akhilesh Kumar Verma: University of Miami, Miller School of Medicine, Miami, Florida, USA
3. Marc E. Brachet: Laboratoire de Physique de l’ ́Ecole Normale Sup ́erieure, ENS, Universit ́e PSL,
CNRS, Sorbonne Universit ́e Universit ́e de Paris, 24 Rue Lhomond, 75005 Paris, France |
| Mode of Presentation: | Poster |
| Abstract Category : | Galaxies and Cosmology |
| Abstract : | We study the evolution and rotational dynamics of axion condensates in the cubic-quintic Gross-Pitaevskii-Poisson equation (cq-GPPE), which we use to model axions in dark-matter haloes or in axion stars, 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 show that, as gravitational strength increases, the equilibrium configuration goes from a tenuous axionic gas, to flat sheets or Zeldovich pancakes, cylindrical structures, and finally a spherical axionic condensate. 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 axion condensate and also a rotating binary-axion-condensate system; in particular, we demonstrate, in the former, the emergence of vortices at large angular speeds Ω 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. |
