Yes. In general relativity, a gravitational wave can leave a lasting change in the relative separation of freely falling test masses after its oscillations pass. This is called gravitational-wave memory. It is a persistent offset in relative geometry—not a visible scar across the universe or a permanent deformation of everyday objects.
What does “permanent distortion” mean?
A passing gravitational wave alternately stretches and squeezes distances. That oscillatory part of the signal changes over time. Memory is a residual difference: after the wave has passed, freely falling test masses can remain separated by a slightly different amount than before. The effect is a change in their relative configuration, not a claim that spacetime is visibly warped forever everywhere.
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The LIGO Laboratory technical note describes a typical memory strain of about 10-23 (document T2000350-v21). Strain describes a fractional change in separation, which helps explain why the effect is extraordinarily difficult to measure. The note’s abstract characterizes memory as a “permanent distortion” left behind as gravitational waves pass through a region of spacetime.
How memory differs from the ordinary wave
The oscillatory waveform is transient: its stretching and squeezing vary as the wave passes. Memory is the non-oscillatory residual offset that remains in the relative positions of test masses. The two are related to the same gravitational-wave event, but they are not the same part of the signal.
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Linear and nonlinear gravitational-wave memory
Memory has more than one source mechanism. The LIGO technical note distinguishes linear memory from nonlinear memory; they should not be treated as interchangeable labels for an identical process.
| Form | Source mechanism | Character of the effect |
|---|---|---|
| Linear memory | Can arise from non-oscillating mass-energy flow. | A lasting residual change in relative separation. |
| Nonlinear memory | Produced by the energy carried by gravitational waves; its contribution accumulates. | Non-oscillatory and cumulative, leaving a residual offset. |
These descriptions follow the LIGO Laboratory technical note, Detectability of Nonlinear Gravitational Wave Memory.
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Can we detect the memory effect?
Detecting a predicted effect is different from measuring it. The LIGO technical note T2000350-v21 says that current detectors had not reliably detected and isolated the nonlinear memory component at the time of that document. It also describes the signal as very weak and difficult to separate, in part because it is concentrated at very low frequencies. This is a dated statement about nonlinear memory, not proof that no form of gravitational-wave memory could ever be detected.
Ground-based interferometers measure strain by monitoring interference in laser light that travels along perpendicular, kilometer-scale arms. Extracting a memory signal therefore requires specialized detector data and analysis; it is not something a household instrument can verify. LIGO’s guide to detector noise and transient-signal extraction explains the measurement context and points to public data and tutorials.
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What future detection studies project
A 2023 study by Alexander M. Grant and David A. Nichols in Physical Review D (published March 27, 2023) examined displacement and spin memory. Its projections depend on detector sensitivity and observing time; they are forecasts, not reported detections or guaranteed milestones.
- For a second-generation LIGO-Virgo-KAGRA network operating at the study’s specified O4 and O5 sensitivities, the authors project that displacement memory could be detected.
- For Cosmic Explorer, the study projects displacement-memory detection in loud individual events and spin-memory detection in a population after five years of observing.
These are conditional results from the study, not confirmation that those observations have taken place. See the paper, “Outlook for detecting the gravitational-wave displacement and spin memory effects with current and future gravitational-wave detectors”.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why the effect matters
Memory provides a way to look for the lasting consequences of a gravitational-wave event, rather than only its changing waveform. Its predicted size and low-frequency character make measurement challenging, but the residual offset is a distinct physical feature that observatories can search for in carefully analyzed data.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchFor an account of how memory can appear as a residual displacement in measurements, see the 2016 Physical Review Letters paper “Detecting Gravitational-Wave Memory with LIGO: Implications of GW150914”.
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