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arxiv: 1907.11305 · v1 · pith:6P5FWT4Fnew · submitted 2019-07-25 · 🌌 astro-ph.IM · astro-ph.CO· astro-ph.GA

Space Based Gravitational Wave Astronomy Beyond LISA

John Baker , Simon F. Barke , Peter L. Bender , Emanuele Berti , Robert Caldwell , John W. Conklin , Neil Cornish , Elizabeth C. Ferrara
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Kelly Holley-Bockelmann Brittany Kamai Shane L. Larson Jeff Livas Sean T. McWilliams Guido Mueller Priyamvada Natarajan Norman Rioux Shannon R Sankar Jeremy Schnittman Deirdre Shoemaker Jacob Slutsky Robin Stebbins Ira Thorpe John Ziemer
This is my paper

Pith reviewed 2026-05-24 15:36 UTC · model grok-4.3

classification 🌌 astro-ph.IM astro-ph.COastro-ph.GA
keywords gravitational wavesspace-based detectorsLISAbLISAmillihertz bandnanohertz frequenciesAstro2030mission concepts
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The pith

LISA's opening of the millihertz gravitational wave band around 2034 will require a follow-on space mission to reach the rest of the spectrum accessible only from space.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This white paper argues that the expected flood of gravitational wave discoveries from LISA will create strong demand for another space-based observatory to cover frequency ranges that ground-based detectors cannot reach. Only space platforms can observe gravitational waves between 10 nanohertz and 1 hertz because of seismic noise on Earth. The authors state that technology development and mission studies must begin in the 2020s so that a concrete concept can be proposed to Astro2030 for a launch in the 2040s. They survey the science targets in these bands and outline the need for a small-scale technology program to support multiple possible designs, which they refer to generically as bLISA.

Core claim

When LISA opens the low-frequency window of the gravitational wave spectrum around 2034, the surge of gravitational-wave astronomy will strongly compel a subsequent mission to further explore the frequency bands of the GW spectrum that can only be accessed from space. The 2020s is the time to start developing technology and studying mission concepts for a large-scale mission to be launched in the 2040s, with the mission concept proposed to Astro2030.

What carries the argument

The bLISA generic mission concept, a post-LISA space-based gravitational wave detector targeting the 10 nHz to 1 Hz band that ground detectors cannot access.

If this is right

  • A dedicated technology development program in the 2020s to mature instruments and concepts across several possible designs.
  • A mission concept study during the same decade to select one specific architecture for submission to Astro2030.
  • Access to gravitational wave sources and signal types that lie outside LISA's 0.1-100 mHz window.
  • Extension of space-based gravitational wave observations into the nanohertz and sub-millihertz regimes for the 2040s.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • A bLISA mission could enable joint observations that connect nanohertz signals from pulsar timing arrays with higher-frequency events seen by LISA and ground detectors.
  • Wider frequency coverage would allow continuous tracking of individual supermassive black hole binaries as they evolve through multiple bands.
  • The program could test whether space-based interferometry at these frequencies can reach the sensitivity needed to detect stochastic backgrounds from the early universe.

Load-bearing premise

The 2020s provide enough lead time to develop the required technology and produce a mature mission concept ready for the Astro2030 proposal process.

What would settle it

LISA data arriving in the mid-2030s that shows the millihertz band contains far fewer sources or lower discovery potential than projected, removing the claimed imperative for an immediate follow-on mission.

Figures

Figures reproduced from arXiv: 1907.11305 by Brittany Kamai, Deirdre Shoemaker, Elizabeth C. Ferrara, Emanuele Berti, Guido Mueller, Ira Thorpe, Jacob Slutsky, Jeff Livas, Jeremy Schnittman, John Baker, John W. Conklin, John Ziemer, Kelly Holley-Bockelmann, Neil Cornish, Norman Rioux, Peter L. Bender, Priyamvada Natarajan, Robert Caldwell, Robin Stebbins, Sean T. McWilliams, Shane L. Larson, Shannon R Sankar, Simon F. Barke.

Figure 1
Figure 1. Figure 1: FIG. 1. GW Spectrum, showing frequency bands where PTAs, LISA and ground-based GW detectors [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Two potential future mission designs compared to the [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. The Folkner low-frequency mis [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. The CBE of LISA’s acceleration noise is based on LPF [PITH_FULL_IMAGE:figures/full_fig_p008_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. The CBE of the most critical of LISA’s long arm inter [PITH_FULL_IMAGE:figures/full_fig_p010_5.png] view at source ↗
read the original abstract

The Laser Interferometer Space Antenna (LISA) will open three decades of gravitational wave (GW) spectrum between 0.1 and 100 mHz, the mHz band. This band is expected to be the richest part of the GW spectrum, in types of sources, numbers of sources, signal-to-noise ratios and discovery potential. When LISA opens the low-frequency window of the gravitational wave spectrum, around 2034, the surge of gravitational-wave astronomy will strongly compel a subsequent mission to further explore the frequency bands of the GW spectrum that can only be accessed from space. The 2020s is the time to start developing technology and studying mission concepts for a large-scale mission to be launched in the 2040s. The mission concept would then be proposed to Astro2030. Only space based missions can access the GW spectrum between 10 nHz and 1 Hz because of the Earths seismic noise. This white paper surveys the science in this band and mission concepts that could accomplish that science. The proposed small scale activity is a technology development program that would support a range of concepts and a mission concept study to choose a specific mission concept for Astro2030. In this white paper, we will refer to a generic GW mission beyond LISA as bLISA.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 1 minor

Summary. The manuscript is a white paper arguing that LISA will open the mHz gravitational-wave band around 2034, creating a surge in discoveries that will compel a follow-on space-based mission (bLISA) to explore the 10 nHz–1 Hz portion of the spectrum accessible only from space. It surveys science opportunities and mission concepts in this band and recommends a small-scale technology development program in the 2020s to prepare a specific concept for Astro2030, targeting launch in the 2040s.

Significance. If LISA’s projected source richness materializes, the paper supplies useful strategic framing for the subsequent phase of space-based GW astronomy by correctly noting the unique access to the cited frequency range and by advocating early technology maturation for long-lead missions. Its contribution is primarily in policy and planning rather than new quantitative results or derivations.

minor comments (1)
  1. [Abstract] Abstract: the introduction of bLISA as a generic label is clear, but the text would benefit from an explicit statement of how the generic term relates to the specific mission concepts surveyed later in the document.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their constructive review and recommendation of minor revision. We appreciate the recognition that the manuscript provides useful strategic framing for post-LISA space-based gravitational-wave astronomy.

Circularity Check

0 steps flagged

No significant circularity; survey white paper with no derivations

full rationale

This is a policy-oriented white paper surveying expected science from LISA and advocating technology development for a follow-on mission (bLISA). It advances no equations, quantitative predictions, fitted parameters, or derivations. The central claim is a forward-looking recommendation that LISA results will motivate a subsequent mission, supported by external astrophysical expectations rather than any self-referential construction. No self-citation load-bearing steps, ansatzes, or uniqueness theorems appear. The timing assumption for the 2020s is an explicit policy premise, not a hidden reduction inside a derivation. The paper is self-contained as a survey and scores at the low end of the allowed range.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

No quantitative models, derivations, or new physical entities are introduced; the document is a high-level science and mission survey.

pith-pipeline@v0.9.0 · 5862 in / 1109 out tokens · 24848 ms · 2026-05-24T15:36:40.184828+00:00 · methodology

discussion (0)

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