Weak-lensing magnification of Type Ia supernovae from the Pantheon sample

Shah, Paul; Lemos, Pablo; Lahav, O.

doi:10.1093/mnras/stac1746

Cited by 5 publications

(1 citation statement)

References 70 publications

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“…Not only the theoretical scenarios have been called into question, but of course, the statistical analysis on the 𝐻 0 measurements constitutes a significant fraction of the literature regarding the Hubble tension [332][333][334][335][336][337][338][339][340][341][342]. The most tricky discussion concerning the Hubble tension must be done considering the probes used for its measurement: Cepheids [11,[343][344][345][346][347][348][349][350][351][352][353][354], SNe Ia , lensed objects [407][408][409][410][411][412][413][414][415][416][417], Cosmic Chronometers (CCs) [418][419][420][421], CMB [12,[422][423][424][425][426][427][428]…”

Section: Pos(corfu2022)235mentioning

confidence: 99%

The Hubble constant tension: current status and future perspectives through new cosmological probes

Dainotti,

De Simone,

Montani;

et al. 2023

Proceedings of Corfu Summer Institute 2022 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2022)

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The Hubble constant (𝐻 0 ) tension is one of the major open problems in modern cosmology. This tension is the discrepancy, ranging from 4 to 6 𝜎, between the 𝐻 0 value estimated locally with the combination of Supernovae Ia (SNe Ia) + Cepheids and the cosmological 𝐻 0 obtained through the study of the Cosmic Microwave Background (CMB) radiation. The approaches adopted in [1] and [2] are introduced. Through a binning division of the Pantheon sample of SNe Ia [3], the value of 𝐻 0 has been estimated in each of the redshift-ordered bins and fitted with a function lowering with the redshift. The results show a decreasing trend of 𝐻 0 with redshift. If this is not due to astrophysical biases or residual redshift evolution of the SNe Ia parameters, it can be explained in light of modified gravity theories, e.g., the 𝑓 (𝑅) scenarios. We also briefly describe the possible impact of high-𝑧 probes on the Hubble constant tension, such as Gamma-ray bursts (GRBs) and Quasars (QSOs), reported in [2] and [4], respectively.

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Section: Pos(corfu2022)235mentioning

confidence: 99%

The Hubble constant tension: current status and future perspectives through new cosmological probes

Dainotti,

De Simone,

Montani;

et al. 2023

Proceedings of Corfu Summer Institute 2022 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2022)

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Impact of lensing bias on the cosmological dispersion measure

Takahashi

2024

J. Cosmol. Astropart. Phys.

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The cosmological dispersion measure (DM) as a function of redshift, derived from localized fast radio bursts (FRBs), has been used as a tool for constraining the cosmic ionized fraction and cosmological parameters. For these purposes, the DM in a homogeneous cosmological model has typically been used, neglecting the inhomogeneity of matter distribution. In this study, we derive a bias in the ensemble average of the DM over many FRBs owing to gravitational lensing by the inhomogeneous matter distribution based on cosmological perturbation theory. We demonstrate that the ensemble average is 0.4 %–1 % smaller than the DM in the corresponding homogeneous model for a source redshift of z s=1, according to recent cosmological hydrodynamic simulations of IllustrisTNG and BAHAMAS. This reduction occurs because light rays from FRBs tend to avoid high-density regions owing to lensing deflection. We also discuss another selection effect, magnification bias, where demagnified FRBs with low DMs, fainter than the detection threshold, are excluded from the observed sample, leading to a selective observation of magnified FRBs with high DMs. Lensing bias, including magnification bias, must be considered to achieve percent level accuracy in the DM-redshift relation.

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The dark energy survey: detection of weak lensing magnification of supernovae and constraints on dark matter haloes

Shah,

Davis,

Bacon

et al. 2024

Monthly Notices of the Royal Astronomical Society

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The residuals of the distance moduli of Type Ia supernovae (SNe Ia) relative to a Hubble diagram fit contain information about the inhomogeneity of the Universe, due to weak lensing magnification by foreground matter. By correlating the residuals of the Dark Energy Survey Year 5 SN Ia sample (DES-SN5YR) with extragalactic foregrounds from the DES Y3 Gold catalogue, we detect the presence of lensing at $6.0 \sigma$ significance. This is the first detection with a significance level above $5\sigma$. Constraints on the effective mass-to-light ratios and radial profiles of dark matter haloes surrounding individual galaxies are also obtained. We show that the scatter of SNe Ia around the Hubble diagram is reduced by modifying the standardization of the distance moduli to include an easily calculable de-lensing (i.e. environmental) term. We use the de-lensed distance moduli to recompute cosmological parameters derived from SN Ia, finding in Flat wcold dark matter a difference of $\Delta \Omega _{\rm M} = +0.036$ and $\Delta w = -0.056$ compared to the unmodified distance moduli, a change of $\sim 0.3\sigma$. We argue that our modelling of SN Ia lensing will lower systematics on future surveys with higher statistical power. We use the observed dispersion of lensing in DES-SN5YR to constrain $\sigma _8$, but caution that the fit is sensitive to uncertainties at small scales. Nevertheless, our detection of SN Ia lensing opens a new pathway to study matter inhomogeneity that complements galaxy–galaxy lensing surveys and has unrelated systematics.

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Weak-lensing magnification of Type Ia supernovae from the Pantheon sample

Cited by 5 publications

References 70 publications

The Hubble constant tension: current status and future perspectives through new cosmological probes

The Hubble constant tension: current status and future perspectives through new cosmological probes

Impact of lensing bias on the cosmological dispersion measure

The dark energy survey: detection of weak lensing magnification of supernovae and constraints on dark matter haloes

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