Numerical simulations of Modified Newtonian Dynamics

19th Chilean Physics Symposium 2014

Candlish, G.N.^1 ; Smith, R.^1,2 ; Fellhauer, M.^1

Departamento de Astronomía, Universidad de Concepción, Casila 160-C, Concepción, Chile^1

Yonsei University, Graduate School of Earth System Sciences-Astronomy-Atmospheric Sciences, Yonsei-ro 50, Seoul

120-749, Korea, Republic of^2

关键词: Cosmological modeling;    Development and testing;    Future applications;    Gravitational forces;    Large scale structures;    Newtonian dynamics;    Scaling relations;    Velocity dispersion;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/720/1/012012/pdf
DOI  :  10.1088/1742-6596/720/1/012012

来源: IOP

【 摘 要 】

The ΛCDM standard cosmological model is strongly supported by multiple lines of evidence, particularly from observations at large scales such as the CMB and large scale structure. There are some indications, however, of problems at smaller scales. An alternative to the CDM approach is to modify the gravitational force, as exemplified by the MOdified Newtonian Dynamics (MOND) idea. While evidence suggests MOND cannot account for dynamics at all scales without dark matter, it has been successful at galactic scales. Due to the complexity of the theory, however, most tests of MOND have extended no further than using a simple scaling relation to determine rotation curves or velocity dispersions. Therefore, to test the concept more thoroughly we require numerical simulations. We discuss the development and testing of a new N-body solver, using two distinct formulations of MOND, that is incorporated into the RAMSES code. The theory of MOND as a modification of Newtonian gravity is briefly summarised. We then show how it is implemented in the code, providing an example of an idealised test case and future applications.