Buchumschlag

FolpsD: combining EFT and phenomenological approaches for joint power spectrum and bispectrum analyses

Fuente: arXiv

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Bibliographische Detailangaben
Hauptverfasser:	Bansal, P., Aviles, A., Noriega, H. E., Guandalin, C., Garzon, I., Niz, G., Wang, M. S., Andrade, U., Beutler, F., de Mattia, A., Gonzalez, D., Hou, J., Huterer, D., Paillas, E., Ibanez, M. Pellejero, Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Cuceu, A., de la Macorra, A., Dey, B., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. Gontcho A, Gutierrez, G., Hahn, C., Herrera-Alcantar, H. K., Honscheid, K., Howlett, C., Ishak, M., Joyce, R., Juneau, S., Kirkby, D., Kremin, A., Landriau, M., Guillou, L. Le, Manera, M., Meisner, A., Miquel, R., Nadathur, S., Percival, W. J., Prada, F., Pérez-Ràfols, I., Rossi, G., Samushia, L., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Silber, J., Tarlé, G., Weaver, B. A., Zarrouk, P., Zhou, R.
Format:	Preprint
Veröffentlicht:	2026
Schlagworte:	Cosmology and Nongalactic Astrophysics
Online-Zugang:	Acceder al recurso
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author	Bansal, P. Aviles, A. Noriega, H. E. Guandalin, C. Garzon, I. Niz, G. Wang, M. S. Andrade, U. Beutler, F. de Mattia, A. Gonzalez, D. Hou, J. Huterer, D. Paillas, E. Ibanez, M. Pellejero Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. Cuceu, A. de la Macorra, A. Dey, B. Doel, P. Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Hahn, C. Herrera-Alcantar, H. K. Honscheid, K. Howlett, C. Ishak, M. Joyce, R. Juneau, S. Kirkby, D. Kremin, A. Landriau, M. Guillou, L. Le Manera, M. Meisner, A. Miquel, R. Nadathur, S. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Samushia, L. Sanchez, E. Schlegel, D. Schubnell, M. Seo, H. Silber, J. Tarlé, G. Weaver, B. A. Zarrouk, P. Zhou, R.
author_facet	Bansal, P. Aviles, A. Noriega, H. E. Guandalin, C. Garzon, I. Niz, G. Wang, M. S. Andrade, U. Beutler, F. de Mattia, A. Gonzalez, D. Hou, J. Huterer, D. Paillas, E. Ibanez, M. Pellejero Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. Cuceu, A. de la Macorra, A. Dey, B. Doel, P. Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Hahn, C. Herrera-Alcantar, H. K. Honscheid, K. Howlett, C. Ishak, M. Joyce, R. Juneau, S. Kirkby, D. Kremin, A. Landriau, M. Guillou, L. Le Manera, M. Meisner, A. Miquel, R. Nadathur, S. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Samushia, L. Sanchez, E. Schlegel, D. Schubnell, M. Seo, H. Silber, J. Tarlé, G. Weaver, B. A. Zarrouk, P. Zhou, R.
contents	We present a theoretical model for the power spectrum and bispectrum of galaxy clustering that exploits the complementarity between small-scale power spectrum information and large-scale bispectrum measurements. We extend the FOLPS code by combining its one-loop EFT galaxy power spectrum with a tree-level galaxy bispectrum projected onto the tripolar spherical harmonics (Sugiyama) basis. To access additional small-scale information, we also consider a line-of-sight damping factor in both statistics, mirroring approaches commonly used in studies of redshift-space distortions. We test the model using DESI DR2 galaxy mocks. Even without damping, the joint analysis of the EFT power spectrum and bispectrum significantly improves constraints and reduces parameter degeneracies relative to power spectrum analyses alone. For LRG-like samples, including the damping further extends the range beyond $k\sim 0.3 \,h \text{Mpc}^{-1}$ in the power spectrum and $k \sim 0.24 \,h \text{Mpc}^{-1}$ in the bispectrum without introducing statistically significant parameter biases. This leads to up to $\sim 30\%$ tighter constraints on $A_s$ and $ω_{cdm}$. For low signal-to-noise tracers such as QSOs, however, the damping parameters are weakly constrained and can absorb noise fluctuations, leading to shifts in inferred parameters. Similar limitations may arise in models where cosmological information is encoded in power-spectrum shape features degenerate with the damping, such as scenarios with massive neutrinos. In contrast, for $w_0w_a$CDM we obtain $15\%$ and $21\%$ tighter constraints on $w_0$ and $w_a$, respectively, yielding a deviation from constant dark energy at slightly more than the $1σ$ level using full-shape information alone. The code is publicly available at https://github.com/cosmodesi/FolpsD
format	Preprint
id	arxiv_https___arxiv_org_abs_2604_08895
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	FolpsD: combining EFT and phenomenological approaches for joint power spectrum and bispectrum analyses Bansal, P. Aviles, A. Noriega, H. E. Guandalin, C. Garzon, I. Niz, G. Wang, M. S. Andrade, U. Beutler, F. de Mattia, A. Gonzalez, D. Hou, J. Huterer, D. Paillas, E. Ibanez, M. Pellejero Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. Cuceu, A. de la Macorra, A. Dey, B. Doel, P. Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Hahn, C. Herrera-Alcantar, H. K. Honscheid, K. Howlett, C. Ishak, M. Joyce, R. Juneau, S. Kirkby, D. Kremin, A. Landriau, M. Guillou, L. Le Manera, M. Meisner, A. Miquel, R. Nadathur, S. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Samushia, L. Sanchez, E. Schlegel, D. Schubnell, M. Seo, H. Silber, J. Tarlé, G. Weaver, B. A. Zarrouk, P. Zhou, R. Cosmology and Nongalactic Astrophysics We present a theoretical model for the power spectrum and bispectrum of galaxy clustering that exploits the complementarity between small-scale power spectrum information and large-scale bispectrum measurements. We extend the FOLPS code by combining its one-loop EFT galaxy power spectrum with a tree-level galaxy bispectrum projected onto the tripolar spherical harmonics (Sugiyama) basis. To access additional small-scale information, we also consider a line-of-sight damping factor in both statistics, mirroring approaches commonly used in studies of redshift-space distortions. We test the model using DESI DR2 galaxy mocks. Even without damping, the joint analysis of the EFT power spectrum and bispectrum significantly improves constraints and reduces parameter degeneracies relative to power spectrum analyses alone. For LRG-like samples, including the damping further extends the range beyond $k\sim 0.3 \,h \text{Mpc}^{-1}$ in the power spectrum and $k \sim 0.24 \,h \text{Mpc}^{-1}$ in the bispectrum without introducing statistically significant parameter biases. This leads to up to $\sim 30\%$ tighter constraints on $A_s$ and $ω_{cdm}$. For low signal-to-noise tracers such as QSOs, however, the damping parameters are weakly constrained and can absorb noise fluctuations, leading to shifts in inferred parameters. Similar limitations may arise in models where cosmological information is encoded in power-spectrum shape features degenerate with the damping, such as scenarios with massive neutrinos. In contrast, for $w_0w_a$CDM we obtain $15\%$ and $21\%$ tighter constraints on $w_0$ and $w_a$, respectively, yielding a deviation from constant dark energy at slightly more than the $1σ$ level using full-shape information alone. The code is publicly available at https://github.com/cosmodesi/FolpsD
title	FolpsD: combining EFT and phenomenological approaches for joint power spectrum and bispectrum analyses
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2604.08895