The Nature of Dark Matter

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...

Formation of Large Structures in the Acceleration Universe with a Hybrid Expansion Law

In the current paper, we have studied the effect of dark energy on for-mation where dark energy exists in the background. For this purpose, we used both WMAP9 and Planck data to study how the radius changes with redshift in these mod-els. We used different data sets to fix the cosmological parameters to obtain a solution for a spherical region under collapse. The mechanism of structure formation f...

Wisdom and Temperament, Emotions, and the Three Dark Personality Traits: A Structural Equation Model

It is valuable and important to study the dark and undesirable dimensions of personality and determine the variables that affect it. The aim of this study was to develop a dark triple causal model of personality based on wisdom and character mediated by positive and negative emotions. In a correlation design based on modeling, 532 male and female students of Tehran Azad University were selecte...

ar X iv : 0 90 1 . 06 32 v 1 [ as tr o - ph . C O ] 6 J an 2 00 9 Dark Matter

A review of the development of the concept of dark matter is given. The dark matter story passed through several stages on its way from a minor observational puzzle to a major challenge for theory of elementary particles. I begin the review with the description of the discovery of the mass paradox in our Galaxy and in clusters of galaxies. First hints of the problem appeared already in 1930s an...

Unifying Dark Energy and Dark Matter with a Scalar Field

The standard model of cosmology considers the existence of two components of unknown nature, “dark matter” and “dark energy”, which determine the cosmological evolution. Their nature remains unknown, and other models can also be considered. In particular, it may be possible to reinterpret the recent cosmological observations so that the Universe does not contain two fluids of unknown natures, b...

Dark Chocolate and Metabolic Syndrome; Do Polyphenols All that Matter?