According to the most accepted understanding of Dark matter…
Dark matter was created in the big bang and originally was as hot as everything else in that era- but, as the universe expanded- it cooled. Just as the unimaginably energetic glow of the Big Bang has ‘cooled’ to become the 3 degrees above absolute zero Cosmic Microwave Background.
Dark matter does not interact with ‘normal’ matter and light, and the degree to which it interacts with itself is unknown, but it is known that it isn’t much. As a result there is no way it can be heated- it cannot absorb photons to increase its energy, it passes through the core of a sun without friction, and friction between the elements of dark matter- whatever they are- is minimal at best so heating due to interaction with itself is zero or nearly so…
The only way dark matter and ‘normal’ matter are known to interact is through gravity.
So we seem to have galaxies made of stars and planets immersed in a very cold gas of dark matter-
This dark matter, under the influence of gravity is speculated to form countless streams that flow through the galaxies.
What happens when a planet passes through a stream of Dark Matter? The dark matter passes through it- only affected by the planet’s gravity- The gravitational field of the planet acts as a lens, focusing the dark matter into a tendril on the trailing side of the planet, this can increase the local density of the dark matter in the ‘focal region’ of the gravitational lens by a factor of billions or even trillions above the average dark matter density.
If a way could be found to identify where this is occurring in our solar system, these regions would be perfect places to study dark matter…
If you had an instrument that could detect some signature of dark matter- for instance a collision and annihilation between two particles of dark matter- once every 500 billion years with dark matter at the average density, then at these regions where its density is enhanced by a factor of a trillion you could expect a detection every 6 months on average….
http://www.nasa.gov/image-feature/jpl/pia20176/dark-matter-hairs-around-earth
The paper is here:
http://arxiv.org/pdf/1507.07009v2.pdf