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Beyond the Required LISA Free-Fall Performance: New LISA Pathfinder Results down to 20  μHz.

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Area of Science:

  • Space physics
  • Gravitational wave astronomy
  • Astrophysics

Background:

  • The Laser Interferometer Space Antenna (LISA) mission aims to detect low-frequency gravitational waves.
  • LISA Pathfinder is a precursor mission to test key technologies for LISA.

Purpose of the Study:

  • To report on the improved noise performance of LISA Pathfinder.
  • To demonstrate the mission's ability to achieve the low-frequency science goals of LISA.

Main Methods:

  • Reduced Brownian noise through decreased pressure around test masses.
  • Improved correction of non-inertial effects.
  • Enhanced calibration of electrostatic force actuation.

Main Results:

  • Measured differential acceleration noise is (1.74±0.05) fm s⁻²/sqrt[Hz] above 2 mHz.
  • Noise reaches (6±1)×10⁻⁹ fm s⁻²/sqrt[Hz] at 20 μHz.
  • Noise measurements achieved good statistics down to 20 μHz.

Conclusions:

  • LISA Pathfinder's performance demonstrates readiness for LISA's scientific objectives.
  • The experimental benchmark validates the technological feasibility of low-frequency gravitational wave detection.