Dark Matter Candidates
نویسنده
چکیده
It is now widely accepted that most of mass–energy in the universe is unobserved except by its gravitational effects. Baryons make only about 4% of the total, with “dark matter” making up about 23% and the “dark energy” responsible for the accelerated expansion of the universe making up the remainder. We focus on the dark matter, which is the primary constituent of galaxies. We outline the observed properties of this material, enumerating some candidates covering 90 orders of magnitude in mass. Finally, we argue that the weak scale (100 GeV) is relevant to new physics, including the dark matter problem.
منابع مشابه
Singlet scalar dark matter in noncommutative space
In this paper, we examine the singlet scalar dark matter annihilation to becoming the Standard Model particles in the non-commutative space. In the recent decades, many candidates of dark matter have been offered, but our information about the nature of dark matter is still limited. There are such particle candidates as scalar matetr, fermion, boson, gauge boson, etc.; however, they have nei...
متن کاملImpact of dark matter decays and annihilations on reionzation
One of the possible methods to distinguish among various dark matter candidates is to study the effects of dark matter decays. We consider four different dark matter candidates (light dark matter, gravitinos, neutralinos and sterile neutrinos), for each of them deriving the decaying/annihilation rate, the influence on reionization, matter temperature and CMB spectra. We find that light dark mat...
متن کاملScalar Dark Matter candidates
We investigate the possibility that Dark Matter could be made of scalar candidates and focus, in particular, on the unusual mass range between a few MeV’s and a few GeV’s. After showing why the Lee-Weinberg limit (which usually forbids a Dark Matter mass below a few GeV’s) does not necessarily apply in the case of scalar particles, we discuss how light candidates (mdm < O(GeV) ) can satisfy bot...
متن کاملConstraining Dark Matter candidates from structure formation
We show that collisional damping of adiabatic primordial fluctuations yields constraints on the possible range of mass and interaction rates of Dark Matter particles. Our analysis relies on a general classification of Dark Matter candidates, that we establish independently of any specific particle theory or model. From a relation between the collisional damping scale and the Dark Matter interac...
متن کاملar X iv : a st ro - p h / 96 03 02 6 v 1 6 M ar 1 99 6 Particle Dark Matter
Several lines of evidence suggest that some of the dark matter may be nonbaryonic: the non-detection of various plausible baryonic candidates for dark matter inferred, e.g., from galaxy rotation curves and from cluster of galaxy velocity dispersions, the need for non-baryonic dark matter for theoretical models of galaxy formation, and the large discrepancy between dynamical measurements implyin...
متن کاملExploring the Mirror Matter Interpretation of the Dama Experiment: Has the Dark Matter Problem Been Solved?
The self consistency between the impressive DAMA annual modulation signal and the measured recoil energy spectrum is identified as an important test for dark matter candidates. Mirror matter-type dark matter passes this test while other dark matter candidates, including standard WIMPs and mini-electric charged particle dark matter , fail. We argue that the unique properties of mirror matter-typ...
متن کامل