Squeezing Full-shape Dynamical Dark Energy Constraints with Galaxy Alignments
Recent 2 σ –4 σ deviations from the cosmological constant ${\rm{\Lambda }}$ suggest that dark energy (DE) may be dynamical, based on baryon acoustic oscillations and full-shape galaxy clustering (FS GC) analyses. This calls for even tighter DE constraints to narrow down its true nature. In this Lett...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal Letters |
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| Online Access: | https://doi.org/10.3847/2041-8213/add1dd |
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| author | Junsup Shim Teppei Okumura Atsushi Taruya |
| author_facet | Junsup Shim Teppei Okumura Atsushi Taruya |
| author_sort | Junsup Shim |
| collection | DOAJ |
| description | Recent 2 σ –4 σ deviations from the cosmological constant ${\rm{\Lambda }}$ suggest that dark energy (DE) may be dynamical, based on baryon acoustic oscillations and full-shape galaxy clustering (FS GC) analyses. This calls for even tighter DE constraints to narrow down its true nature. In this Letter, we explore how galaxy intrinsic alignments (IA) can enhance the FS GC–based DE constraints, using Fisher forecasts on various extensions of dynamical DE models, including scenarios with curvature, massive neutrinos, and modified gravity. Incorporating IA improves the DE figure of merit by 42%–57% and tightens the primordial power spectrum amplitude constraints by 17%–19%. Our findings highlight IA’s potential as a valuable cosmological probe complementary to GC. |
| format | Article |
| id | doaj-art-701e5891ffb94f7090d8618d90d588b0 |
| institution | Kabale University |
| issn | 2041-8205 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Letters |
| spelling | doaj-art-701e5891ffb94f7090d8618d90d588b02025-08-20T03:49:41ZengIOP PublishingThe Astrophysical Journal Letters2041-82052025-01-019851L1410.3847/2041-8213/add1ddSqueezing Full-shape Dynamical Dark Energy Constraints with Galaxy AlignmentsJunsup Shim0https://orcid.org/0000-0001-7352-6175Teppei Okumura1https://orcid.org/0000-0002-8942-9772Atsushi Taruya2https://orcid.org/0000-0002-4016-1955Academia Sinica Institute of Astronomy and Astrophysics (ASIAA) , No. 1, Section 4, Roosevelt Road, Taipei 106216, Taiwan ; jshim@asiaa.sinica.edu.twAcademia Sinica Institute of Astronomy and Astrophysics (ASIAA) , No. 1, Section 4, Roosevelt Road, Taipei 106216, Taiwan ; jshim@asiaa.sinica.edu.tw; Kavli IPMU (WPI), UTIAS, The University of Tokyo , Kashiwa, Chiba 277-8583, JapanKavli IPMU (WPI), UTIAS, The University of Tokyo , Kashiwa, Chiba 277-8583, Japan; Yukawa Institute for Theoretical Physics, Kyoto University , Kyoto 606-8502, JapanRecent 2 σ –4 σ deviations from the cosmological constant ${\rm{\Lambda }}$ suggest that dark energy (DE) may be dynamical, based on baryon acoustic oscillations and full-shape galaxy clustering (FS GC) analyses. This calls for even tighter DE constraints to narrow down its true nature. In this Letter, we explore how galaxy intrinsic alignments (IA) can enhance the FS GC–based DE constraints, using Fisher forecasts on various extensions of dynamical DE models, including scenarios with curvature, massive neutrinos, and modified gravity. Incorporating IA improves the DE figure of merit by 42%–57% and tightens the primordial power spectrum amplitude constraints by 17%–19%. Our findings highlight IA’s potential as a valuable cosmological probe complementary to GC.https://doi.org/10.3847/2041-8213/add1ddDark energyAstrostatistics strategies |
| spellingShingle | Junsup Shim Teppei Okumura Atsushi Taruya Squeezing Full-shape Dynamical Dark Energy Constraints with Galaxy Alignments The Astrophysical Journal Letters Dark energy Astrostatistics strategies |
| title | Squeezing Full-shape Dynamical Dark Energy Constraints with Galaxy Alignments |
| title_full | Squeezing Full-shape Dynamical Dark Energy Constraints with Galaxy Alignments |
| title_fullStr | Squeezing Full-shape Dynamical Dark Energy Constraints with Galaxy Alignments |
| title_full_unstemmed | Squeezing Full-shape Dynamical Dark Energy Constraints with Galaxy Alignments |
| title_short | Squeezing Full-shape Dynamical Dark Energy Constraints with Galaxy Alignments |
| title_sort | squeezing full shape dynamical dark energy constraints with galaxy alignments |
| topic | Dark energy Astrostatistics strategies |
| url | https://doi.org/10.3847/2041-8213/add1dd |
| work_keys_str_mv | AT junsupshim squeezingfullshapedynamicaldarkenergyconstraintswithgalaxyalignments AT teppeiokumura squeezingfullshapedynamicaldarkenergyconstraintswithgalaxyalignments AT atsushitaruya squeezingfullshapedynamicaldarkenergyconstraintswithgalaxyalignments |