Abstract Details
| Name: JONMONI DUTTA Affiliation: Tezpur University Conference ID: ASI2025_600 Title : Nonlinear normal acoustic modes in nonthermal star-forming clouds with moderative extra-negative ionic effects Authors and Co-Authors : Jonmoni Dutta, Pralay Kumar Karmakar Abstract Type : Poster Abstract Category : Stars, Interstellar Medium, and Astrochemistry in Milky Way Abstract : The presence of negative ions in the space and astrophysical environment is inevitable [1]. It plays a significant role in triggering non-local gravitational collapse dynamics for the bounded structure formation mechanism in complex clouds of infinite extension [1]. We herein develop a theoretical model formalism to explore the nonlinear normal acoustic modes excitable in spherically symmetric tridust molecular clouds (TMCs). The partially ionized complex TMC is composed mainly of lighter species, such as electrons, positive ions, and negative ions. Its heavier species include bipolar charged dust grains alongside partial ionization. The TMC model is presumed to form initially a quasi-neutral hydrostatic homogeneous equilibrium configuration [2]. The spatial behavior of the high-energetic lighter compositions, such as electrons, positive ions, and negative ions, is described by the κ-deformed Kaniadakis distribution laws [3]. The novelty of this distribution function lies in its ability to offer a robust model for studying high-energy particles in the astrophysical context where relativistic effects are significant [3]. The thermal pressure behavior of constitutive dust fluids is formulated in the framework of the Larson logatropic equation of state. The application of a standard reductive perturbation method yields a unique pair of extended Korteweg-de Vries (KdV) equations with dissimilar nonlinear and dispersion effects. It is seen analytically that the characteristic behavior of the nonlinear structural patterns depends on the diverse equilibrium plasma parameters. A detailed numerical analysis characterizing the elaborate modal features in a conjugational form is in progress. References [1] T.J. Millar, C. Walsh, and T.A. Field, “Negative ions in space”, Chemical reviews, 117, 3, February 2017, pp. 1765-1795. [2] C.B. Dwivedi, A.K. Sen, and S. Bujarbarua, “Pulsational mode of gravitational collapse and its impact on the star formation”, Astronomy and Astrophysics, 345, May 1999, pp. 1049-1053. [3] G. Kaniadakis, “Statistical mechanics in the context of special relativity”, Physical review E, 66(5), 2002, pp. 056125(1-17). |