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Euclid preparation. Galaxy 2-point correlation function modelling in redshift space

Euclid Collaboration M. Karcher M.-A. Breton S. D. Torre A. Veropalumbo A. Eggemeier +495 lainnya
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The Euclid satellite will measure spectroscopic redshifts for tens of millions of emission-line galaxies. In the context of Stage-IV surveys, the 3-dimensional clustering of galaxies plays a key role in providing cosmological constraints. In this paper, we conduct a model comparison for the multipole moments of the galaxy 2-point correlation function (2PCF) in redshift space. We test state-of-the-art models, in particular the effective field theory of large-scale structure (EFT), one based on the velocity difference generating function (VDG$_{\infty}$), and different variants of Lagrangian perturbation theory (LPT) models, such as convolutional LPT (CLPT) and its effective-field-theory extension (CLEFT). We analyse the first three even multipoles of the 2PCF in the Flagship 1 simulation, which consists of four snapshots at $z\in\{0.9,1.2,1.5,1.8\}$. We study both template-fitting and full-shape approaches and find that with the template-fitting approach, only the VDG$_{\infty}$ model is able to reach a minimum fitting scale of $s_{\rm min}=20\,h^{-1}\,{\rm Mpc}$ at $z=0.9$ without biasing the recovered parameters. Indeed, the EFT model becomes inaccurate already at $s_{\rm min}=30\,h^{-1}\,{\rm Mpc}$. Conversely, in the full-shape analysis, the CLEFT and VDG$_{\infty}$ models perform similarly well, but only the CLEFT model can reach $s_{\rm min}=20\,h^{-1}\,{\rm Mpc}$ while the VDG$_{\infty}$ model is unbiased down to $s_{\rm min}=25\,h^{-1}\,{\rm Mpc}$ at the lowest redshift. Overall, in order to achieve the accuracy required by Euclid, non-perturbative modelling such as in the VDG$_{\infty}$ or CLEFT models should be considered. At $z=1.8$, the CLPT model is sufficient to describe the data with high figure of merit. This comparison selects baseline models that perform best in ideal conditions and sets the stage for an optimal analysis of Euclid data in configuration space.

Topik & Kata Kunci

Physics

Penulis (500)

E

Euclid Collaboration M. Karcher

M

M.-A. Breton

S

S. D. Torre

A

A. Veropalumbo

A

A. Eggemeier

M

M. Crocce

E

E. Sefusatti

E

E. Sarpa

R

R. E. Angulo

B

B. Quevedo

L

L. Castiblanco

E

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A

A. Chudaykin

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A

A. Farina

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F

F. Marulli

A

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M. Moresco

C

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K

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A

A. Pezzotta

M

M. P. Ibáñez

C

C. Porciani

A

A. Pugno

M

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N

N. Aghanim

B

B. Altieri

L

L. Amendola

S

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N

N. Auricchio

C

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M

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A

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E. Branchini

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F. Vernizzi

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S. Vinciguerra

N

N. A. Walton

A

A. Universit'e

C

Cnrs

C

Cnes

L

Lam

M

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F

France

A

A. Universit'e

U

Universit'e de Toulon

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Cpt

D

Dipartimento di FisicaAldo Pontremoli

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U. Milano

1

16 viaCeloria

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20133 Milano

I

Italy

U

Universit'e Paris-Saclay

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Universit'e de Paris Cit'e

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Cea

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Aim

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91191

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Gif-sur-Yvette

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Inaf Brera

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28 ViaBrera

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20133 Milano

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I. Genova

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33 viaDodecaneso

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16146

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Genova

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D. Fisica

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U. Genova

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U. Bonn

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Argelander Institut fur Astronomie

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71 AufdemHugel

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53121 Bonn

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Germany

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Institute of Space Sciences

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Campus Uab

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Carrer de Can Magrans

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Sn

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08193 Barcelona

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Spain.

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I. D. E. D. Catalunya

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Edifici Rdit

C

C. Upc

0

08860 Castelldefels

B

Barcelona

I

Inaf Trieste

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11 ViaG.B.Tiepolo

3

34127 Trieste

I

Ifpu

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Institute for Fundamental Physics of the Universe

2

2. viaBeirut

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34127 Trieste

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Infn

S

Sezione di Trieste

2

2. ViaValerio

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TS 34127Trieste

S

Sissa

I

International School for Advanced Studies

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Via Bonomea 265

T

TS 34136Trieste

I

I. -. C. N. D. R. I. H. P. Computing

B

Big Data e Quantum Computing

2

2. ViaMagnanelli

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Bologna

D

Donostia International Physics Center

P

P. M. Lardizábal

2

20018

D

Donostia-San Sebasti'an

G

Guipuzkoa

I

Ikerbasque

B

Basque Foundation for Science

4

48013

B

Bilbao

S

S. O. Mathematics

S

Statistics

P

Physics

N

N. University

H

Herschel Building

N

Newcastle-upon-Tyne

N

NE1 7RU

U

Uk

F

F. Physik

U

U. Bielefeld

P

Postfach 100131

3

33501 Bielefeld

I

I. Milano

U

U. Geneve

D

D'epartement de Physique Th'eorique

C

Centre for Theoretical Physics

2

24 quai Ernest-Ansermet

4

4. CH-1211Geneve

S

Switzerland.

T

T. I. O. Technology

I

Israel

D

D. Astronomia

U

U. Bologna

V

V. G. 932

4

40129 Bologna

I

I. Bologna

V

V. G. 933

I

I. Parma

V

Viale delle Scienze 7A 43124 Parma

D

D. Bologna

V

V. G. 932

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I. Bologna

6

62 vialeBertiPichat

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40129 Bologna

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Laboratoire de Physique Théorique

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Cnrs Universite Savoie Mont Blanc

9

9. C. D. Bellevue

B

BP 110

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Annecy-le-Vieux

7

74941 Annecy Cedex

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Institute for Astronomy

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U. Edinburgh

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R. Observatory

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B. Hill

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Edinburgh EH9 3HJ

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D. Physics

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O. University

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Keble Road

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O. 3RH

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I. D. Spatiale

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91405

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Orsay

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Esacesa

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Camino Bajo de Castillo

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Sn

U

Urb. Villafranca del Castillo

2

28692 Villanueva de la Canada

M

Madrid

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I. Physik

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U. Heidelberg

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16 Philosophenweg

6

69117 Heidelberg

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Department of PhysicsE. Pancini

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U. Federico

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6. ViaCinthia

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80126

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Napoli

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I. -. Capodimonte

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16 viaMoiariello

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80131 Napoli

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U. Torino

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1. ViaP.Giuria

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10125 Torino

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I. Torino

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I. Torino

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20 viaOsservatorio

1

1. P. Torinese

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L

Leiden University

5

55 Einsteinweg

2

2333 CC Leiden

T

The Netherlands.

I

Inaf-Iasf Milano

1

12 ViaAlfonsoCorti

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Inafiasf Roma

3

33 viaFrascati

0

00078 Monte Porzio Catone

I

I. Roma

P

P. A. Moro

2

2. -. C. D. D. Fisica

E

Edificio G. Marconi

0

00133 Roma

C

Centro de Investigaciones Energ'eticas

M

Medioambientales y Tecnol'ogicas

4

40 AvenidaComplutense

2

28014 Madrid

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Port d'Informaci'o Cient'ifica

C

C. Sn

0

08193 Bellaterra

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I. Naples

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U. Hawaii

2

2680 Woodlawn Drive

H

Honolulu

H

HI 96822

U

Usa

I

Instituto de Astrof'isica de Canarias

E

E. Laguna

T

Tenerife

E

European Space AgencyESRIN

1

1. LargoGalileoGalilei

0

00044 Frascati

R

Roma

1

1. Universit'eClaudeBernardLyon

C

CNRSIN2p3

I

I. Lyon

U

Umr 5822

V

Villeurbanne

Format Sitasi

APA MLA BibTeX
Karcher, E.C.M., Breton, M., Torre, S.D., Veropalumbo, A., Eggemeier, A., Crocce, M. et al. (2026). Euclid preparation. Galaxy 2-point correlation function modelling in redshift space. https://www.semanticscholar.org/paper/1bc598e19e31aadf30fe02d81bd672a0ed39dc8a

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