Gravitational wave constraints on extended dark matter structures

Abstract

We generalise existing constraints on primordial black holes to dark objects with extended sizes using the aLIGO design sensitivity. We show that LIGO is sensitive to dark objects with radius O(10 − 10 3 km) if they make up more than ∼ O(10 −2 − 10 −3 ) of dark matter.

Cosmic microwave background constraints on extended dark matter objects

“…Once this is obtained, the constraints from figure 6 Complementarity of constraints on the maximum allowed dark matter fraction as a function of mass, for boson stars and NFW subhaloes of particular sizes. Shown here are constraints from the non-observation of microlensing signals [7,9] in the EROS-2 [54], OGLE-IV [4] (note that this does not include the latest results based on a combination of the OGLE-III and OGLE-IV datasets [55]), and Subaru-HSC [56] datasets; gravitational wave signals from the inspiral regime of binary mergers assuming binary formation in the early Universe ( [19]), and collisional ionisation of the CMB due to accretion (this work). The gray regions show the limitations of our analysis, corresponding to those EDOs whose radius is comparable to their corresponding Schwarzschild radius, or those whose Bondi radius breaks the isolated EDO assumption (eq.…”

“…(2. 19), implying that the evolution of the temperature is not affected by relativistic effects. Therefore, the only thing that we need to address is the energy density, for which we can take two different routes: use eq.…”

“…[1][2][3][4][5][6][7][8][9][10][11]), and gravitational waves (e.g. [12][13][14][15][16][17][18][19]) on these objects as DM candidates.…”