Pith Number

pith:NFTHIGJ2

pith:2026:NFTHIGJ2KY4EIDM5WWI23CPPPO

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Probing nonlinear structure formation beyond $\Lambda$CDM with the LSS bootstrap: a joint power spectrum and bispectrum analysis

Giorgia Biselli, Guido D'Amico, Marco Marinucci, Massimo Pietroni

The LSS bootstrap yields first MCMC constraints on deviations from ΛCDM using power spectrum and bispectrum.

arxiv:2605.13298 v1 · 2026-05-13 · astro-ph.CO

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C1strongest claim

We present the first MCMC-derived constraints on the parameters of the Large Scale Structure (LSS) bootstrap... For BOSS, combining the power spectrum with the bispectrum monopole yields ∼7% constraints on ε_f and ∼57% constraints on ε_{d_γ}.

C2weakest assumption

The LSS bootstrap parametrization, based on symmetry arguments alone, correctly captures all relevant deviations from ΛCDM in the linear growth rate and quadratic perturbation-theory kernel for the scales probed by BOSS and PT Challenge data.

C3one line summary

First MCMC constraints on LSS bootstrap parameters yield ~7% precision on linear growth modifications and ~57% on quadratic kernel modifications from BOSS data, improving to 1% and 25% with larger simulations.

References

72 extracted · 72 resolved · 22 Pith anchors

[1] (see also [13]), which provided the initial Fisher-matrix forecasts for these parameters for a Euclid-like survey. Here, we perform a state-of-the-art combined analysis of the one-loop galaxy power sp 2048

[2] we leave it free (only for the BOSS analysis)

[3] we fixln (1010As) = 3.0448, thePlanckbest-fit value [39], for the BOSS analysis, and to the true value used in the simulations for the PT Challenge

[4] we instead adopt a Gaussian prior onAs with a width equal to3σof thePlanckuncertainty [ 39], following refs. [40, 41]. Given thatPlanck’s uncertainty onAs is extremely small, fixingAs or applying a3σG 2048

[5] Y. Mellieret al.(Euclid), Euclid. I. Overview of the Euclid mission, Astron. Astrophys.697, A1 (2025), arXiv:2405.13491 [astro-ph.CO] 2025

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Receipt and verification

First computed	2026-05-18T02:44:49.066452Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

696674193a5638440d9db591ad89ef7ba7761d4be8af97c72beddee0de7f021f

Aliases

arxiv: 2605.13298 · arxiv_version: 2605.13298v1 · doi: 10.48550/arxiv.2605.13298

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curl -sH 'Accept: application/ld+json' https://pith.science/pith/NFTHIGJ2KY4EIDM5WWI23CPPPO \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 696674193a5638440d9db591ad89ef7ba7761d4be8af97c72beddee0de7f021f

Canonical record JSON

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    "abstract_canon_sha256": "b06f2570b8ac42355a8b2ac3844ec4119893fa5fb7306545444f8a63b2f7a814",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2026-05-13T10:12:06Z",
    "title_canon_sha256": "94bc6c33096b53d7522b7ed9966cf09385b90c120e307679ec367fccf2fbc304"
  },
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    "kind": "arxiv",
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}