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The Dark Energy Survey Supernova Program: A Reanalysis Of Cosmology Results And Evidence For Evolving Dark Energy With An Updated Type Ia Supernova Calibration

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Main Authors:	Popovic, B., Shah, P., Kenworthy, W. D., Kessler, R., Davis, T. M., Goobar, A., Scolnic, D., Vincenzi, M., Wiseman, P., Chen, R., Charleton, E., Acevedo, M., Armstrong, P., Boyd, B. M., Brout, D., Camilleri, R., Frieman, J., Galbany, L., Grayling, M., Kelsey, L., Rose, B., Sánchez, B., Lee, J., Möller, A., Smith, M., Sullivan, M., Shiamtanis, N., Alarcon, A., Allam, S. S., Andrade-Oliveira, F., Avila, S., Bacon, D., Blazek, J., Bocquet, S., Brooks, D., Burke, D. L., Rosell, A. Carnero, Carretero, J., Cawthon, R., da Costa, L. N., Pereira, M. E. da Silva, Diehl, H. T., Dodelson, S., Doel, P., Everett, S., Frohmaier, C., García-Bellido, J., Gruen, D., Gutierrez, G., Herner, K., Hinton, S. R., Hollowood, D. L., Honscheid, K., Huterer, D., James, D. J., Jeffrey, N., Kuehn, K., Lahav, O., Lee, S., Lidman, C., Marshall, J. L., Mena-Fernández, J., Menanteau, F., Miquel, R., Muir, J., Myles, J., Ogando, R. L. C., Paterno, M., Malagón, A. A. Plazas, Porredon, A., Prat, J., Nichol, R. C., Romer, A. K., Roodman, A., Sanchez, E., Cid, D. Sanchez, Sevilla-Noarbe, I., Suchyta, E., Swanson, M. E. C., To, C., Tucker, D. L., Walker, A. R., Weaverdyck, N.
Format:	Preprint
Published:	2025
Subjects:	Cosmology and Nongalactic Astrophysics
Online Access:	Acceder al recurso
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_version_	1866917461782167552
author	Popovic, B. Shah, P. Kenworthy, W. D. Kessler, R. Davis, T. M. Goobar, A. Scolnic, D. Vincenzi, M. Wiseman, P. Chen, R. Charleton, E. Acevedo, M. Armstrong, P. Boyd, B. M. Brout, D. Camilleri, R. Frieman, J. Galbany, L. Grayling, M. Kelsey, L. Rose, B. Sánchez, B. Lee, J. Möller, A. Smith, M. Sullivan, M. Shiamtanis, N. Alarcon, A. Allam, S. S. Andrade-Oliveira, F. Avila, S. Bacon, D. Blazek, J. Bocquet, S. Brooks, D. Burke, D. L. Rosell, A. Carnero Carretero, J. Cawthon, R. da Costa, L. N. Pereira, M. E. da Silva Diehl, H. T. Dodelson, S. Doel, P. Everett, S. Frohmaier, C. García-Bellido, J. Gruen, D. Gutierrez, G. Herner, K. Hinton, S. R. Hollowood, D. L. Honscheid, K. Huterer, D. James, D. J. Jeffrey, N. Kuehn, K. Lahav, O. Lee, S. Lidman, C. Marshall, J. L. Mena-Fernández, J. Menanteau, F. Miquel, R. Muir, J. Myles, J. Ogando, R. L. C. Paterno, M. Malagón, A. A. Plazas Porredon, A. Prat, J. Nichol, R. C. Romer, A. K. Roodman, A. Sanchez, E. Cid, D. Sanchez Sevilla-Noarbe, I. Suchyta, E. Swanson, M. E. C. To, C. Tucker, D. L. Walker, A. R. Weaverdyck, N.
author_facet	Popovic, B. Shah, P. Kenworthy, W. D. Kessler, R. Davis, T. M. Goobar, A. Scolnic, D. Vincenzi, M. Wiseman, P. Chen, R. Charleton, E. Acevedo, M. Armstrong, P. Boyd, B. M. Brout, D. Camilleri, R. Frieman, J. Galbany, L. Grayling, M. Kelsey, L. Rose, B. Sánchez, B. Lee, J. Möller, A. Smith, M. Sullivan, M. Shiamtanis, N. Alarcon, A. Allam, S. S. Andrade-Oliveira, F. Avila, S. Bacon, D. Blazek, J. Bocquet, S. Brooks, D. Burke, D. L. Rosell, A. Carnero Carretero, J. Cawthon, R. da Costa, L. N. Pereira, M. E. da Silva Diehl, H. T. Dodelson, S. Doel, P. Everett, S. Frohmaier, C. García-Bellido, J. Gruen, D. Gutierrez, G. Herner, K. Hinton, S. R. Hollowood, D. L. Honscheid, K. Huterer, D. James, D. J. Jeffrey, N. Kuehn, K. Lahav, O. Lee, S. Lidman, C. Marshall, J. L. Mena-Fernández, J. Menanteau, F. Miquel, R. Muir, J. Myles, J. Ogando, R. L. C. Paterno, M. Malagón, A. A. Plazas Porredon, A. Prat, J. Nichol, R. C. Romer, A. K. Roodman, A. Sanchez, E. Cid, D. Sanchez Sevilla-Noarbe, I. Suchyta, E. Swanson, M. E. C. To, C. Tucker, D. L. Walker, A. R. Weaverdyck, N.
contents	We present improved cosmological constraints from a re-analysis of the Dark Energy Survey (DES) 5-year sample of Type Ia supernovae (DES-SN5YR). This re-analysis includes an improved photometric cross-calibration, recent white dwarf observations to cross-calibrate between DES and low redshift surveys, retraining the SALT3 light curve model and fixing a numerical approximation in the host galaxy colour law. Our fully recalibrated sample, which we call DES-Dovekie, comprises $\sim$1600 likely Type Ia SNe from DES and $\sim$200 low-redshift SNe from other surveys. With DES-Dovekie, we obtain $Ω_{\rm m} = 0.330 \pm 0.015$ in Flat $Λ$CDM which changes $Ω_{\rm m}$ by $-0.022$ compared to DES-SN5YR. Combining DES-Dovekie with CMB data from Planck, ACT and SPT and the DESI DR2 measurements in a Flat $w_0 w_a$CDM cosmology, we find $w_0 = -0.803 \pm 0.054$, $w_a = -0.72 \pm 0.21$. Our results hold a significance of $3.2σ$, reduced from $4.2σ$ for DES-SN5YR, to reject the null hypothesis that the data are compatible with the cosmological constant. This significance is equivalent to a Bayesian model preference odds of approximately 5:1 in favour of the Flat $w_0 w_a$CDM model. Using generally accepted thresholds for model preference, our updated data exhibits only a weak preference for evolving dark energy.
format	Preprint
id	arxiv_https___arxiv_org_abs_2511_07517
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	The Dark Energy Survey Supernova Program: A Reanalysis Of Cosmology Results And Evidence For Evolving Dark Energy With An Updated Type Ia Supernova Calibration Popovic, B. Shah, P. Kenworthy, W. D. Kessler, R. Davis, T. M. Goobar, A. Scolnic, D. Vincenzi, M. Wiseman, P. Chen, R. Charleton, E. Acevedo, M. Armstrong, P. Boyd, B. M. Brout, D. Camilleri, R. Frieman, J. Galbany, L. Grayling, M. Kelsey, L. Rose, B. Sánchez, B. Lee, J. Möller, A. Smith, M. Sullivan, M. Shiamtanis, N. Alarcon, A. Allam, S. S. Andrade-Oliveira, F. Avila, S. Bacon, D. Blazek, J. Bocquet, S. Brooks, D. Burke, D. L. Rosell, A. Carnero Carretero, J. Cawthon, R. da Costa, L. N. Pereira, M. E. da Silva Diehl, H. T. Dodelson, S. Doel, P. Everett, S. Frohmaier, C. García-Bellido, J. Gruen, D. Gutierrez, G. Herner, K. Hinton, S. R. Hollowood, D. L. Honscheid, K. Huterer, D. James, D. J. Jeffrey, N. Kuehn, K. Lahav, O. Lee, S. Lidman, C. Marshall, J. L. Mena-Fernández, J. Menanteau, F. Miquel, R. Muir, J. Myles, J. Ogando, R. L. C. Paterno, M. Malagón, A. A. Plazas Porredon, A. Prat, J. Nichol, R. C. Romer, A. K. Roodman, A. Sanchez, E. Cid, D. Sanchez Sevilla-Noarbe, I. Suchyta, E. Swanson, M. E. C. To, C. Tucker, D. L. Walker, A. R. Weaverdyck, N. Cosmology and Nongalactic Astrophysics We present improved cosmological constraints from a re-analysis of the Dark Energy Survey (DES) 5-year sample of Type Ia supernovae (DES-SN5YR). This re-analysis includes an improved photometric cross-calibration, recent white dwarf observations to cross-calibrate between DES and low redshift surveys, retraining the SALT3 light curve model and fixing a numerical approximation in the host galaxy colour law. Our fully recalibrated sample, which we call DES-Dovekie, comprises $\sim$1600 likely Type Ia SNe from DES and $\sim$200 low-redshift SNe from other surveys. With DES-Dovekie, we obtain $Ω_{\rm m} = 0.330 \pm 0.015$ in Flat $Λ$CDM which changes $Ω_{\rm m}$ by $-0.022$ compared to DES-SN5YR. Combining DES-Dovekie with CMB data from Planck, ACT and SPT and the DESI DR2 measurements in a Flat $w_0 w_a$CDM cosmology, we find $w_0 = -0.803 \pm 0.054$, $w_a = -0.72 \pm 0.21$. Our results hold a significance of $3.2σ$, reduced from $4.2σ$ for DES-SN5YR, to reject the null hypothesis that the data are compatible with the cosmological constant. This significance is equivalent to a Bayesian model preference odds of approximately 5:1 in favour of the Flat $w_0 w_a$CDM model. Using generally accepted thresholds for model preference, our updated data exhibits only a weak preference for evolving dark energy.
title	The Dark Energy Survey Supernova Program: A Reanalysis Of Cosmology Results And Evidence For Evolving Dark Energy With An Updated Type Ia Supernova Calibration
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2511.07517