Detectability of GWs from ultralight scalar clouds [4.5 yr]
FoM
Science investigation and Observational requirement: SI5.5 from Science requirement document.
Compute the range of detectable (\(SNR>10\)) boson masses for a reference BH with initial mass \(M=4 * 10^6 M_{\odot}\) (i.e. SgrA\(^*\)-like) and spin \(a/M = 0.9\) at \(z=0.5\)}
- OK 94.51894646087347 [0 90 110] : Detectability of continuous GWs from scalar boson clouds
Capability to detect GWs from boson clouds
Summary
We use low frequency cutoff 2e-05 Hz, and a reference MBH with initial mass 4000000.0 and initial spin 0.9 at redshift 0.5. We consider observation time 4.005 years and SNR threshold 10.0
We use as reference value the quantity
\(q = 100 (\max(m_b)-\min(m_b)) / 3.5e-18\)
with \(\max(m_b)\) and \(\min(m_b)\)) the maximum and minimum detectable scalar field mass, respectively.
For this reference system, we should be able to detect at least a mass range such that:
- q > \(90\) (green)
- q < \(90\) (yellow)
-
q > \(110\) (blue)
-
Detectable mass range is [7.05e-18, 1.04e-17] eV
Angle-averaged SNR of a continuous GW produced by an ultralight boson cloud. We assume a boson mass that maximizes GW emission
Expected number of resolvable sources with SNR > 10.0 as a function of boson mass.
Expected SNR of the stochastic background as a function of the boson mass.
Detailed results
Input parameters
- log : log/SO5_ultralight_bosons.log
- config : config.yml
- subconfig :
- duration : 4.5 yr
- duty_cycle : 0.89
- armlength : 2500000000.0 m
- noise : SciRDv1_redbook/noise_background_4.5_yr.npy
- show : False
- fast : 0
- tdi2 : 1
- freqs : [2e-05, 1]
- force_duration : 4.5_yr
- report : SciRDv1_redbook/report_SO5b_ultralight_bosons.md
- data_path : SO5/SMBH_massfunction