Regular matter makes up all that is us as well as the virtuoso , but it is still not enough to excuse what we see in the universe . If our theories are correct , there should be more matter out there – one that only interact through gravitation and ca n’t be realise . For this intellect , it is called dour matter .
Dark subject is thought to interact with regular thing only on rare social function . Now , according to a new subject field , this happening is 1,000 times less likely than we thought . The project value and abstract thought is published inThe Astrophysical Journal Letters .
Dark subject is crucial in the current exemplar of cosmogony . The premise that this inwardness survive can be used to create simulations that explicate what we see in the universe of discourse . The general approximation is that obscure matter is cold ( movement easy compared to the speed of light ) , lightness in mass , and collisionless ( it does n’t really interact with itself or steady matter ) .
But these models are not corking when it come to the detail . They predict , for instance , that large galaxies like the whitish Way should have one thousand of modest satellite extragalactic nebula around them , but we do n’t seem to find these galaxy around the Milky Way . So far , only 59 small-scale galaxies have been discovered within 1.4 million idle - geezerhood from our galaxy .
Therefore , the team started with the Assumption of Mary that these small-scale satellite galaxies do not exist and no future data-based military campaign will find them . If this is the subject , we postulate to rethink how dismal matter behaves . One proposal suggests that in the other universe , dark matter was “ warmer ” , so it impress much faster and was less likely to clump . By using the number of known satellites , the researchers estimated how likely this was for the sorry matter to interact with other molecule . The number they got is 1,000 times less than previous limit . It also puts a novel allow great deal compass to the particle that make up coloured issue .
“ What ’s really exciting is that our report nicely bridges observational observations of light galaxies today with hypothesis of dour matter and its behavior in the early universe . It join a lot of man , and by doing so it tells us something very profound about dark topic , ” lead writer Ethan Nadler , from the SLAC / Stanford Kavli Institute for Particle Astrophysics and Cosmology , said in astatement . “ Although we still do n’t love what dark matter is made of , our upshot are a step forward that sets tighter limits on what it in reality can be . ”
