Related Experiment Video
Updated: Aug 5, 2026
10:52
Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior
Published on: April 13, 2016
Extending Ground-Based Gravitational-Wave Sensitivity to 5 Hz
Amit Singh Ubhi1, Lari Koponen1, Jiri Smetana1
1University of Birmingham, Institute for Gravitational Wave Astronomy, School of Physics and Astronomy, Birmingham B15 2TT, United Kingdom.
Physical Review Letters
|July 31, 2026
Summary
New technologies enable terrestrial gravitational-wave detectors to sense lower frequencies. This advancement significantly improves the detection of intermediate-mass black hole binaries and paves the way for next-generation observatories.
Area of Science:
- Astrophysics
- Gravitational-wave astronomy
- Instrumental physics
Background:
- Terrestrial gravitational-wave detectors face challenges in sensitivity below 20 Hz due to ground motion and inertial noise.
- Current detectors like LIGO have limitations in low-frequency sensitivity, restricting the detection of certain astrophysical events.
Purpose of the Study:
- To develop and demonstrate ultra-high-vacuum compatible technologies for enhanced inertial isolation and position sensing.
- To improve the low-frequency sensitivity of terrestrial gravitational-wave detectors.
- To extend the detection capabilities for intermediate-mass black hole binaries.
Main Methods:
- Development of ultra-high-vacuum compatible inertial isolation systems.
- Implementation of laser position sensors with sub-picometer/sqrt[Hz] sensitivity.
- Integration of advanced inertial and position sensors into a LIGO-like interferometer model.
Main Results:
- Achieved active platform stabilization down to 10 mHz.
- Demonstrated laser position sensors with 100-fold improvement over current LIGO sensors.
- Inertial sensors show at least a 5-fold improvement in low-frequency sensitivity compared to commercial seismometers.
- Predicted up to an order of magnitude sensitivity improvement at 10 Hz.
Conclusions:
- The study provides the first experimental demonstration of a practical pathway to sub-10 Hz operation for terrestrial gravitational-wave detectors.
- The developed technologies offer enhanced linearity and calibration stability.
- These advancements are crucial for next-generation observatories like Cosmic Explorer and Einstein Telescope, increasing detection horizons for black hole binaries.
Related Concept Videos
01:20Variation in Acceleration due to Gravity near the Earth's Surface
An object's apparent weight is its weight measured by a spring balance at its location. It is different from its true weight, the force with which the Earth pulls it, because of the Earth's rotation. Mathematically, an object's apparent weight equals its true weight minus the centripetal force that keeps it in a circular motion along with the Earth's surface every 24 hours.
The difference between the true and apparent weights is proportional to the square of the Earth's angular speed. Since the...
The difference between the true and apparent weights is proportional to the square of the Earth's angular speed. Since the...
01:12Measuring Acceleration Due to Gravity
Consider a coffee mug hanging on a hook in a pantry. If the mug gets knocked, it oscillates back and forth like a pendulum until the oscillations die out.
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
01:26Influence of Earth's Curvature and Atmospheric Refraction on Leveling
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
01:22Intensity Of Electromagnetic Waves
The energy transport per unit area per unit time, or the Poynting vector, gives the energy flux of an electromagnetic wave at any specific time. For a plane electromagnetic wave with E0 and B0 as the peak electric and magnetic fields and traveling along the x-axis, the time-varying energy flux can be given by the following equation:
01:05Doppler Effect - II
The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
00:56Doppler Effect - I
The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...