دورية أكاديمية
Predicting dark matter particle mass and properties from two-thirds law and energy cascade in dark matter flow
| العنوان: | Predicting dark matter particle mass and properties from two-thirds law and energy cascade in dark matter flow |
|---|---|
| المؤلفون: | Xu, Zhijie (Jay) |
| سنة النشر: | 2022 |
| المجموعة: | Zenodo |
| مصطلحات موضوعية: | cosmology, dark matter, turbulence, simulation, astronomy, astrophysics, dark matter halo, correlation, statistical analysis, self-gravitating, collisionless, N body, two-thrids law, mass cascade, energy cascade, dark matter particle mass, dark matter particle size, dark matter particle property |
| الوصف: | Predicting dark matter particle mass and properties from two-thirds law and energy cascade in dark matter flow Dark matter can be characterized by the mass and size of its smallest constituents, which are challenging to be directly probed and detected. After years of null results in the search for thermal WIMPs, a different prospective might be required beyond the standard WIMP paradigm. We present a new approach to estimate the dark matter particle mass, size, density, and many other relevant properties based on the nature of flow of dark matter. A comparison with hydrodynamic turbulence is presented to reveal the unique features of self-gravitating collisionless dark matter flow, i.e. an inverse mass and energy cascade from small to large scales with a scale-independent rate of energy cascade \(\varepsilon_u\approx -4.6\times 10^{-7}m^2/s^3\). For the simplest case with only gravitational interaction involved and in the absence of viscosity in flow, the energy cascade leads to a two-thirds law for pairwise velocity that can be extended down to the smallest scale, where quantum effects become important. Combining the rate of energy cascade \(\varepsilon_u\), the Planck constant \(\hbar\), and the gravitational constant \(G\) on the smallest scale, the mass of dark matter particles is found to be around \(0.9\times10^{12}GeV\) with a size around \(3\times10^{-13}m\). Since the mass scale \(m_X\) is only weakly dependent on \(\varepsilon_u\) as \(m_X \propto (-\varepsilon_u\hbar^5/G^4)^{1/9}\), the estimation of \(m_X\) should be pretty robust for a wide range of possible values of \(\varepsilon_u\). If gravity is the only interaction and dark matter is fully collisionless, mass of around \(10^{12}GeV\) is required to produce the given rate of energy cascade \(\varepsilon_u\). In other words, if mass has a different value, there must be some new interaction beyond gravity. This work strongly suggests a heavy dark matter scenario produced in the early universe (\(\sim 10^{-14}s\)) with a mass much greater than ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | https://zenodo.org/record/6640353Test; https://doi.org/10.48550/arXiv.2202.07240Test; oai:zenodo.org:6640353 |
| DOI: | 10.48550/arXiv.2202.07240 |
| الإتاحة: | https://doi.org/10.48550/arXiv.2202.07240Test https://doi.org/10.5281/zenodo.6569901Test https://doi.org/10.5281/zenodo.6569898Test https://doi.org/10.5281/zenodo.6541230Test https://doi.org/10.5281/zenodo.6586212Test https://doi.org/10.48550/arXiv.2109.12244Test https://doi.org/10.48550/arXiv.2110.03126Test https://doi.org/10.48550/arXiv.2110.05784Test https://doi.org/10.48550/arXiv.2110.09676Test https://doi.org/10.48550/arXiv.2110.13885Test |
| حقوق: | info:eu-repo/semantics/openAccess ; https://creativecommons.org/licenses/by/4.0/legalcodeTest |
| رقم الانضمام: | edsbas.D6856B54 |
| قاعدة البيانات: | BASE |
| DOI: | 10.48550/arXiv.2202.07240 |
|---|