Looking for ultralight dark matter near supermassive black holes

被引:72
作者
Bar, Nitsan [1 ]
Blum, Kfir [1 ,2 ]
Lacroix, Thomas [3 ]
Panci, Paolo [2 ,4 ,5 ,6 ]
机构
[1] Weizmann Inst Sci, Dept Particle Phys & Astrophys, Herzl 234, IL-7610001 Rehovot, Israel
[2] CERN, Theory Dept, CH-1211 Geneva 23, Switzerland
[3] Univ Autonoma Madrid, Inst Fis Teor, CSIC, Calle Nicolas Cabrera 13-15, E-28049 Madrid, Spain
[4] Lab Nazl Gran Sasso, Via G Acitelli 22, I-67100 Assergi, AQ, Italy
[5] Univ Pisa, Dipartimento Fis, Largo Pontecorvo 3, I-56127 Pisa, Italy
[6] Ist Nazl Fis Nucl, Sez Pisa, Largo Pontecorvo 3, I-56127 Pisa, Italy
基金
欧盟地平线“2020”;
关键词
dark matter experiments; dark matter theory; massive black holes; SCALAR FIELD; MASS-DISTRIBUTION; DENSITY PROFILE; MILKY; GALAXIES; FUZZY; CUSP;
D O I
10.1088/1475-7516/2019/07/045
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Measurements of the dynamical environment of supermassive black holes (SMBHs) are becoming abundant and precise. We use such measurements to look for ultralight dark matter (ULDM), which is predicted to form dense cores ("solitons") in the centre of galactic halos. We search for the gravitational imprint of an ULDM soliton on stellar orbits near Sgr A* and by combining stellar velocity measurements with Event Horizon Telescope imaging of M87*. Finding no positive evidence, we set limits on the soliton mass for different values of the ULDM particle mass m. The constraints we derive exclude the solitons predicted by a naive extrapolation of the soliton-halo relation, found in DM-only numerical simulations, for 2 x 10(-20) eV less than or similar to m less than or similar to 8 x 10(-19) eV (from Sgr A*) and m less than or similar to 4 x 10(-22) eV (from M87*). However, we present theoretical arguments suggesting that an extrapolation of the soliton-halo relation may not be adequate: in some regions of the parameter space, the dynamical effect of the SMBH could cause this extrapolation to over-predict the soliton mass by orders of magnitude.
引用
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页数:25
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