A new probe of the small-scale primordial power spectrum: Astrometric microlensing by ultracompact minihalos
作者： Fangda Li , Adrienne L. Erickcek , Nicholas M. Law
DOI: 10.1103/PHYSREVD.86.043519
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摘要: The dark matter enclosed in a density perturbation with large initial amplitude ($\ensuremath{\delta}\ensuremath{\rho}/\ensuremath{\rho}\ensuremath{\gtrsim}{10}^{\ensuremath{-}3}$) collapses shortly after recombination and forms an ultracompact minihalo (UCMH). Their high central densities make UCMHs especially suitable for detection via astrometric microlensing: as the UCMH moves, it changes apparent position of background stars. An mass larger than few solar masses can produce distinctive microlensing signal that is detectable by space astrometry mission Gaia. If Gaia does not detect gravitational lensing any UCMHs, then establishes upper limit on their abundance constrains primordial power spectrum $k\ensuremath{\sim}2700\text{ }\text{ }{\mathrm{Mpc}}^{\ensuremath{-}1}$. These constraints complement bound derived from limits gamma-ray emission because produced maximized if annihilation rate too low to affect UCMH's profile. within detectable, search could constrain be less ${10}^{\ensuremath{-}5}$; this 3 orders magnitude stronger absence black holes.
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