arXiv subjects

Mario Juvenal S Onglao III

Publications and source records attributed to Mario Juvenal S Onglao III.

2 recordsLinked to original sources

arXiv2026

CHRONOS Science Program

Cryogenic sub-Hz cROss torsion-bar detector with quantum NOn-demolition Speed meter (CHRONOS) is a proposed cryogenic torsion-bar interferometer for precision measurements in the 0.1-10 Hz band. A Sagnac speed-meter readout, power and signal recycling, and balanced homodyne detection provide control of the optical response and quantum measurement correlations. This White Paper describes the science program, detector design, calibration, and staged experimental development. The reference sensitivity uses a multi-input quantum model, including rear-mirror vacuum fields and measurement-back-action correlations, combined with classical noise. Two operating points are optimized for complementary power-law-integrated sensitivity objectives. Gravitational-wave forecasts use this common noise budget and state their source and observing assumptions. The program includes intermediate-mass black-hole binaries, stochastic backgrounds, quantum measurement, and terrestrial gravity perturbations. Dark-matter applications are discussed as response and feasibility studies. A differential gravitational calibrator provides a proposed Yukawa-gravity test whose systematic floor is improved by subtracting auxiliary harmonics. These are conditional projections: experimental reach requires validation of the noise, transfer functions, environmental backgrounds, and systematic uncertainties described here.

astro-ph.IM↗

arXiv2026

Cryogenic sub-Hz cROss torsion bar detector with quantum NOn-demolition Speed meter (CHRONOS) for gravitational wave detection

We present the optical design and sensitivity modeling of the Cryogenic sub-Hz cROss torsion-bar detector with quantum NOn-demolition Speed meter (CHRONOS), a triangular Sagnac speed-meter interferometer incorporating power and signal recycling. Using ABCD-matrix analysis and \textsc{Finesse3} simulations, we obtain stable optical eigenmodes with mode-matching efficiencies above 99.5%. The optimized configuration achieves a quantum-noise-limited strain sensitivity of $h \simeq 3\times10^{-18},\mathrm{Hz^{-1/2}}$ at 1 Hz, with a ring-cavity finesse of $\mathcal{F}\simeq3.1\times10^{4}$ and a round-trip Gouy phase of $ψ\approx153^{\circ}$. The low-frequency quantum noise is primarily governed by the power-recycling cavity detuning, while the signal-recycling cavity produces an approximately uniform quadrature rotation. An optimal homodyne angle of $ζ\simeq46^{\circ}$ provides the best sensitivity near 1 Hz. Assuming an end-mirror reflectivity of $R_{\mathrm{ETM}}=99.9999%$ at 10 K, CHRONOS can achieve quantum-noise-limited performance on a laboratory scale. Its projected science reach includes intermediate-mass black-hole binaries out to approximately $271,\mathrm{Mpc}$, a 10-year stochastic-background sensitivity of $Ω_{\mathrm{GW}}\simeq4.7\times10^{-4}$ at $2.15,\mathrm{Hz}$, constraints on Yukawa-type deviations from Newtonian gravity, and prompt gravity-gradient signals from nearby earthquakes.

physics.ins-det↗