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Ignazio Ciufolini1, Antonio Paolozzi2, Erricos C Pavlis3

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Area of Science:

  • Geophysics
  • Gravitational physics
  • Astrophysics

Background:

  • Laser-ranging offers precise tests of gravity in the weak-field regime.
  • Frame-dragging, the spacetime distortion caused by rotating masses, is a key prediction of general relativity.
  • Previous measurements of frame-dragging had significant uncertainties.

Purpose of the Study:

  • To measure terrestrial frame-dragging with unprecedented precision.
  • To provide stringent confirmation of Einstein's general theory of relativity.
  • To constrain alternative gravitational theories and extensions.

Main Methods:

  • Utilized data from the Laser Relativity Satellite 2 (LARES-2), LAGEOS, and GRACE satellites.
  • Employed precise laser-ranging techniques to analyze satellite orbits.
  • Combined data from multiple satellites for enhanced accuracy.

Main Results:

  • Achieved a one-part-in-a-thousand relative uncertainty in the measurement of terrestrial frame-dragging.
  • Demonstrated an order-of-magnitude improvement over previous Solar System determinations.
  • Significantly constrained alternative gravitational models, including scalar-tensor extensions.

Conclusions:

  • The results provide a stringent confirmation of general relativity in the near-Earth environment.
  • The study places strong constraints on alternative theories of gravity that predict deviations in frame-dragging.
  • The combined analysis also improved the determination of Earth's lunisolar tides, highlighting broader geophysical applications.