Search for Subsolar Mass Ultracompact Binaries in Advanced LIGO's Second Observing Run.
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PHYSICAL REVIEW LETTERS（2019）
Cited 155|Views71
Abstract
We present a search for subsolar mass ultracompact objects in data obtained during Advanced LIGO's second observing run. In contrast to a previous search of Advanced LIGO data from the first observing run, this search includes the effects of component spin on the gravitational waveform. We identify no viable gravitational-wave candidates consistent with subsolar mass ultracompact binaries with at least one component between 0.2 M-circle dot-1.0 M-circle dot. We use the null result to constrain the binary merger rate of (0.2 M-circle dot, 0.2 M-circle dot) binaries to be less than 3.7 x 10(5) Gpc(-3) yr(-1) and the binary merger rate of (1.0 M-circle dot, 1.0 M-circle dot) binaries to be less than 5.2 x 10(3) Gpc(-3) yr(-1). Subsolar mass ultracompact objects are not expected to form via known stellar evolution channels, though it has been suggested that primordial density fluctuations or particle dark matter with cooling mechanisms and/or nuclear interactions could form black holes with subsolar masses. Assuming a particular primordial black hole (PBH) formation model, we constrain a population of merging 0.2 M-circle dot black holes to account for less than 16% of the dark matter density and a population of merging 1.0 M-circle dot black holes to account for less than 2% of the dark matter density. We discuss how constraints on the merger rate and dark matter fraction may be extended to arbitrary black hole population models that predict subsolar mass binaries.
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Key words
subsolar mass ultracompact binaries,advanced ligos,observing
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