The value of the Hubble rate at the start of reheating that gives the correct relic abundance, as a function of the mass of the PIDM. The blue curve is for γ=1 , the orange curve is for γ=0.1 , and the green curve is for γ=0.01 . The red region is excluded from the current bound on the tensor-to-scalar ratio, and the purple dashed line is the projected sensitivity for next generation CMB experiments, from Ref. [24]. The dotted lines show the modification when taking also gravitational production into account [12, 13, 14]. The dashed-dotted line marks mX=Hi , and for a scalar PIDM the left-hand side of this line is excluded unless corrections to the PIDM potential are important during inflation. All values are given in units of Mp .
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dark matter tagged posts
What Dark Matter Might Be: Researchers present a new model and how to test it
March 14, 2016,
Astronomy/Space
Dark Matter Satellites Trigger Massive Birth of Stars
March 10, 2016,
Astronomy/Space
This is a dwarf galaxy with a starburst. Credit: UC Riverside
Astronomers use computer simulations based on theoretical models to explain massive star formation observed in dwarf galaxies. One of the main predictions of the current model of the creation of structures in the universe, known at the Lambda Cold Dark Mattermodel, is that galaxies are embedded in very extended and massive halos of dark matter surrounded by many thousands of smaller sub-halos also made from dark matter.
Around large galaxies, eg Milky Way, these dark matter sub-halos are large enough to host enough gas and dust to form small galaxies on their own, and some of these galactic companions, known as satellite galaxies, can be observed...
Read MoreBright Sparks shed new light on the Dark Matter riddle
February 2, 2016,
Astronomy/Space, Physics
One of the CRESST detector modules. When illuminated with ultraviolet light, the scintillating inner shield glows brightly.
Highest sensitivity detector ever for very light dark matter elementary particles. The origin of matter in the universe has puzzled physicists for generations. Today, we know that matter only accounts for 5% of our universe; another 25% is constituted of dark matter. And the remaining 70% is made up of dark energy. Dark matter itself represents an unsolved riddle.
Physicists believe that such dark matter is composed of (as yet undefined) elementary particles that stick together thanks to gravitational force. In a study recently published in EPJ C, scientists from the CRESST-II research project use the phonon-light technique to detect dark matter...
Read MoreGalaxy Quakes could improve Hunt for Dark Matter
January 9, 2016,
Astronomy/Space
These images of the Milky Way show the distribution of gas, at left, compared to the distribution of stars, at right, after the dwarf satellite disrupts the galaxy. Credit: Sukanya Chakrabarti/Rochester Institute of Technology
A trio of brightly pulsating stars at the outskirts of the Milky Way is racing away from the galaxy and may confirm a method for detecting dwarf galaxies dominated by dark matter and explain ripples in the outer disk of the galaxy. This new method to characterize dark matter marks the first real application of galactoseismology. Just as seismologists analyze waves to infer properties about Earth’s interior, Sukanya Chakrabarti, assistant professor at Rochester Institute of Technology, uses waves in the galactic disk to map the interior structure and mass of galaxies.
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