arXiv subjects

F. S. Lima

Publications and source records attributed to F. S. Lima.

3 recordsLinked to original sources

arXiv2022

Strong lensing systems and galaxy cluster observations as probe to the cosmic distance duality relation

{In this paper, we use large scale structure observations to test the redshift dependence of cosmic distance duality relation (CDDR), $D_{\rm L}(1+z)^{-2}/D_{\rm A}=η(z)$}, with $D_{\rm L}$ and $D_{\rm A}$, being the luminosity and angular diameter distances, respectively. In order to perform the test, the following data set are considered: strong lensing systems and galaxy cluster measurements (gas mass fractions). No specific cosmological model is adopted, only a flat universe is assumed. { By considering two $η(z)$ parametrizations, It is observed that the CDDR remain redshift independent within $1.5σ$ which is in full agreement with other recent tests involving cosmological data}. It is worth to comment that our results are independent of the baryon budget of galaxy clusters.

astro-ph.CO↗

arXiv2021

On the cosmic distance duality relation and the strong gravitational lens power law density profile

Many new strong gravitational lensing (SGL) systems have been discovered in the last two decades with the advent of powerful new space and ground-based telescopes. The effect of the lens mass model (usually the power-law mass model) on cosmological parameters constraints has been performed recently in literature. In this paper, by using SGL systems and Supernovae type Ia observations, we explore if the power-law mass density profile ($ρ\propto r^{-γ}$) is consistent with the cosmic distance duality relation (CDDR), $D_L(1+z)^{-2}/D_A=η(z)=1$, by considering different lens mass intervals. { It has been obtained that the verification of the CDDR validity is significantly dependent on lens mass interval considered: the sub-sample with $σ_{ap} \geq 300$ km/s (where $σ_{ap}$ is the lens apparent stellar velocity dispersion) is in full agreement with the CDDR validity, the sub-sample with intermediate $σ_{ap}$ values ($200 \leq σ_{ap} < 300)$ km/s is marginally consistent with $η=1$ and, finally, the sub-sample with low $σ_{ap}$ values ($σ_{ap} < 200$ km/s) ruled out the CDDR validity with high statistical confidence. Therefore, if one takes the CDDR as guarantee, our results suggest that using a single density profile is not suitable to describe lens with low $σ_{ap}$ values and it is only an approximate description to lenses with intermediate mass interval. }

astro-ph.CO↗

arXiv2017

Probing the distance-duality relation with high-$z$ data

Measurements of strong gravitational lensing jointly with type Ia supernovae (SNe Ia) observations have been used to test the validity of the cosmic distance duality relation (CDDR), $D_L(z)/[(1+z)^2D_A(z)]=η=1$, where $D_L(z)$ and $D_A(z)$ are the luminosity and the angular diameter distances to a given redshift $z$, respectively. However, several lensing systems lie in the interval $1.4 \leq z \leq 3.6$ i.e., beyond the redshift range of current SNe Ia compilations ($z \approx 1.50$), which prevents this kind of test to be fully explored. In this paper, we circumvent this problem by testing the CDDR considering observations of strong gravitational lensing along with SNe Ia and { a subsample from} the latest gamma-ray burst distance modulus data, whose redshift range is $0.033 \leq z \leq 9.3$. { We parameterize their luminosity distances with a second degree polynomial function and search for possible deviations from the CDDR validity by using four different $η(z)$ functions: $η(z)=1+η_0z$, $η(z)=1+η_0z/(1+z)$, $η(z)=(1+z)^{η_0}$ and $η(z)=1+η_0\ln(1+z)$. Unlike previous tests done at redshifts lower than $1.50$, the likelihood for $η_0$ depends strongly on the $η(z)$ function considered, but we find no significant deviation from the CDDR validity ($η_0=0$). However, our analyses also point to the fact that caution is needed when one fits data in higher redshifts to test the CDDR as well as a better understanding of the mass distribution of lenses also is required for more accurate results.

astro-ph.CO↗