All-sky search for continuous gravitational waves from isolated neutron stars using Advanced LIGO and Advanced Virgo O3 data

We present results of an all-sky search for continuous gravitational waves which can be produced byspinning neutron stars with an asymmetry around their rotation axis, using data from the third observingrun of the Advanced LIGO and Advanced Virgo detectors. Four different analysis methods are used tosearch in a gravitational-wave frequency band from 10 to 2048 Hz and a first frequency derivative from-10-8 to 10-9 Hz=s. No statistically significant periodic gravitational-wave signal is observed by any ofthe four searches. As a result, upper limits on the gravitational-wave strain amplitude h0 are calculated. Thebest upper limits are obtained in the frequency range of 100 to 200 Hz and they are ~1.1 × 10-25 at95% confidence level. The minimum upper limit of 1.10 × 10-25 is achieved at a frequency 111.5 Hz. Wealso place constraints on the rates and abundances of nearby planetary- and asteroid-mass primordial blackholes that could give rise to continuous gravitational-wave signals.