RHRodrigo F. L. Holanda
Rodrigo F. L. Holanda
*This is an algorithmically generated author record based on publicly available information.
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Rodrigo F. L. Holanda has a total of 113 co-authors. Here are the top co-authors by number of shared publications:
- Saulo H. Pereira
Departamento de Física, Faculdade de Engenharia e Ciências de Guaratinguetá, Universidade Estadual Paulista (UNESP), Av. Dr. Ariberto Pereira da Cunha 333, 12516-410, Guaratinguetá, SP, Brazil
30 shared publications - Jailson S. Alcaniz
Observatório Nacional, Ministério da Ciencia, Tecnologia, Inovação e Comunicações
19 shared publications - Vinicius Consolini Busti
Departamento de Física Matemática Instituto de Física Universidade de São Paulo 66318 05508-090 São Paulo -SP CP CEP Brazil
18 shared publications - Leonardo R. Colaço
Universidade Federal do Rio Grande do Norte
16 shared publications - Raimundo Silva
Programa de Pós-Graduação em Física, Universidade do Estado do Rio Grande do Norte, Mossoró, Brasil
12 shared publications - Kamal Bora
Department of Physics, Indian Institute of Technology, Hyderabad, Kandi, India
11 shared publications
Latest Publications
- Open Access
Probing the Cosmic Distance Duality Relation via Non-Parametric Reconstruction for High Redshifts
We test the validity of the cosmic distance duality relation (CDDR) by combining angular diameter distance and luminosity distance measurements from recent cosmological observations. For the angular diameter distance, we use data from transverse baryon acoustic oscillations and galaxy clusters. On the other hand, the luminosity distance is obtained from Type Ia supernovae in the Pantheon+ sample and from quasar catalogs. To reduce the large dispersion in quasar luminosity distances, we apply a selection criterion based on their deviation from the $Λ$CDM model and implement a binning procedure to suppress statistical noise. We reconstruct the CDDR using Gaussian Processes, a non-parametric supervised machine learning method. Our results show no significant deviation from the CDDR within the $2σ$ confidence level across the redshift range explored, supporting its validity even at high redshifts.Open AccessProbing the Cosmic Distance Duality Relation via Non-Parametric Reconstruction for High Redshifts
We test the validity of the cosmic distance duality relation (CDDR) by combining angular diameter distance and luminosity distance measurements from recent cosmological observations. For the angular diameter distance, we use data from transverse baryon acoustic oscillations and galaxy clusters. On the other hand, the luminosity distance is obtained from Type Ia supernovae in the Pantheon+ sample and from quasar catalogs. To reduce the large dispersion in quasar luminosity distances, we apply a selection criterion based on their deviation from the $Λ$CDM model and implement a binning procedure to suppress statistical noise. We reconstruct the CDDR using Gaussian Processes, a non-parametric supervised machine learning method. Our results show no significant deviation from the CDDR within the $2σ$ confidence level across the redshift range explored, supporting its validity even at high redshifts. - Open Access
Probing the Cosmic Distance Duality Relation via Non-Parametric Reconstruction for High Redshifts
We test the validity of the cosmic distance duality relation (CDDR) by combining angular diameter distance and luminosity distance measurements from recent cosmological observations. For the angular diameter distance, we use data from transverse baryon acoustic oscillations and galaxy clusters. On the other hand, the luminosity distance is obtained from Type Ia supernovae in the Pantheon+ sample and from quasar catalogs. To reduce the large dispersion in quasar luminosity distances, we apply a selection criterion based on their deviation from the CDM model and implement a binning procedure to suppress statistical noise. We reconstruct the CDDR using Gaussian Processes, a non-parametric supervised machine learning method. Our results show no significant deviation from the CDDR within the confidence level across the redshift range explored, supporting its validity even at high redshifts.Open AccessProbing the Cosmic Distance Duality Relation via Non-Parametric Reconstruction for High Redshifts
We test the validity of the cosmic distance duality relation (CDDR) by combining angular diameter distance and luminosity distance measurements from recent cosmological observations. For the angular diameter distance, we use data from transverse baryon acoustic oscillations and galaxy clusters. On the other hand, the luminosity distance is obtained from Type Ia supernovae in the Pantheon+ sample and from quasar catalogs. To reduce the large dispersion in quasar luminosity distances, we apply a selection criterion based on their deviation from the CDM model and implement a binning procedure to suppress statistical noise. We reconstruct the CDDR using Gaussian Processes, a non-parametric supervised machine learning method. Our results show no significant deviation from the CDDR within the confidence level across the redshift range explored, supporting its validity even at high redshifts. - Open Access
An investigation of a varying G through Strong Lensing and SNe Ia observations
In this paper, we analyze the potential variation of the gravitational constant $G$ using data from strong gravitational lensing systems and Type Ia supernovae. Testing $G(z)$ parameterizations where $G(z) = G_0(1 + G_1z)$ and $G(z) = G_0(1 + z)^{G_1}$, we also account for the influence of $G$ on the luminosity of SNe Ia through the Chandrasekhar mass-luminosity relation. Only the flat universe hypothesis is considered. Constraints from 158 lensing systems and the Pantheon+ sample show no significant evidence of $G$ variation. However, although the results are compatible with no variation, the errors are not yet sufficiently restrictive to rule out any variation of $G$ with high statistical confidence. This study highlights the viability of using combined astrophysical data to probe variations in fundamental constants, suggesting that future surveys could refine these constraints.Open AccessAn investigation of a varying G through Strong Lensing and SNe Ia observations
In this paper, we analyze the potential variation of the gravitational constant $G$ using data from strong gravitational lensing systems and Type Ia supernovae. Testing $G(z)$ parameterizations where $G(z) = G_0(1 + G_1z)$ and $G(z) = G_0(1 + z)^{G_1}$, we also account for the influence of $G$ on the luminosity of SNe Ia through the Chandrasekhar mass-luminosity relation. Only the flat universe hypothesis is considered. Constraints from 158 lensing systems and the Pantheon+ sample show no significant evidence of $G$ variation. However, although the results are compatible with no variation, the errors are not yet sufficiently restrictive to rule out any variation of $G$ with high statistical confidence. This study highlights the viability of using combined astrophysical data to probe variations in fundamental constants, suggesting that future surveys could refine these constraints. - Open Access
- 23 July 2025
- Published by Elsevier in Physics Letters B
- Vol. 868
An investigation of a varying G through Strong Lensing and SNe Ia observations
- 23 July 2025
- Published by Elsevier in Physics Letters B
- Vol. 868
Open AccessAn investigation of a varying G through Strong Lensing and SNe Ia observations
- Open Access
Revisiting the temperature evolution law of the CMB with gaussian processes
In this work, we perform a statistical inference of the classical background law governing the evolution of the temperature of the cosmic microwave background radiation (CMB), given by $T_{\rm CMB}(z) = T_0(1 + z)$. To this end, we employ Gaussian Process (GP) regression techniques to reconstruct the temperature evolution based on two observational datasets: (i) CMB-Sunyaev-Zel'dovich (SZ) cluster measurements and (ii) CMB-interstellar medium (ISM) interaction data. Our analysis reveals interesting results that may suggest potential deviations from the standard temperature-redshift relation, particularly at low redshifts ($z < 0.5$), where discrepancies up to $\sim$2$\sigma$ are observed. Additionally, we identify a mild but noteworthy tension, also at the $\sim$2$\sigma$ level, between our GP inferred value of the present-day CMB temperature, $T_{\rm CMB}(z=0)$, and the precise direct measurement from the COBE/FIRAS experiment. We also explore possible phenomenological implications of our findings, including interpretations associated with possible variations in fundamental constants, such as the fine-structure constant $\alpha$, which could provide a physical explanation for the observed deviations at low redshift.Open AccessRevisiting the temperature evolution law of the CMB with gaussian processes
In this work, we perform a statistical inference of the classical background law governing the evolution of the temperature of the cosmic microwave background radiation (CMB), given by $T_{\rm CMB}(z) = T_0(1 + z)$. To this end, we employ Gaussian Process (GP) regression techniques to reconstruct the temperature evolution based on two observational datasets: (i) CMB-Sunyaev-Zel'dovich (SZ) cluster measurements and (ii) CMB-interstellar medium (ISM) interaction data. Our analysis reveals interesting results that may suggest potential deviations from the standard temperature-redshift relation, particularly at low redshifts ($z < 0.5$), where discrepancies up to $\sim$2$\sigma$ are observed. Additionally, we identify a mild but noteworthy tension, also at the $\sim$2$\sigma$ level, between our GP inferred value of the present-day CMB temperature, $T_{\rm CMB}(z=0)$, and the precise direct measurement from the COBE/FIRAS experiment. We also explore possible phenomenological implications of our findings, including interpretations associated with possible variations in fundamental constants, such as the fine-structure constant $\alpha$, which could provide a physical explanation for the observed deviations at low redshift. - Open Access
- 26 May 2025
- Published by Springer Nature in The European Physical Journal C
- Vol. 85 (5) , 1-11
A joint analysis of strong lensing and type Ia supernovae to determine the Hubble constant
We present a cosmological model-independent determination of the Hubble constant, $$H_0$$ , by combining time-delay measurements from seven TDCOSMO systems, Einstein radius measurements, and type Ia supernovae data sourced from the Pantheon+ sample. For each lens of time-delay system, we calculate the angular diameter distance $$D_{A_l}$$ using the product $$D^{\text {Obs}}(z_l) \cdot D_{A,\Delta t}^{\text {Obs}}(z_l, z_s)$$ , where $$D^{\text {Obs}}(z_l)$$ is reconstructed via Gaussian Processes from 99 Einstein radius measurements, and $$D_{A,\Delta t}^{\text {Obs}}(z_l,z_s)$$ is the time-delay angular distance. We also reconstruct the unanchored luminosity distance $$H_0 D_L(z_l)$$ from supernova data. By using the cosmic distance duality relation validity, we anchor $$D_{A_l}$$ and $$H_0 D_L(z_l)$$ to infer $$H_0 = 70.55 \pm 7.44$$ km/s/Mpc (68% CL). Our result, though not resolving the Hubble tension, offers a cosmological model-independent consistency check and highlights the potential of using strong lensing and supernovae data via the cosmic distance duality relation to constrain $$H_0$$ .- 26 May 2025
- Published by Springer Nature in The European Physical Journal C
- Vol. 85 (5) , 1-11
Open AccessA joint analysis of strong lensing and type Ia supernovae to determine the Hubble constant
We present a cosmological model-independent determination of the Hubble constant, $$H_0$$ , by combining time-delay measurements from seven TDCOSMO systems, Einstein radius measurements, and type Ia supernovae data sourced from the Pantheon+ sample. For each lens of time-delay system, we calculate the angular diameter distance $$D_{A_l}$$ using the product $$D^{\text {Obs}}(z_l) \cdot D_{A,\Delta t}^{\text {Obs}}(z_l, z_s)$$ , where $$D^{\text {Obs}}(z_l)$$ is reconstructed via Gaussian Processes from 99 Einstein radius measurements, and $$D_{A,\Delta t}^{\text {Obs}}(z_l,z_s)$$ is the time-delay angular distance. We also reconstruct the unanchored luminosity distance $$H_0 D_L(z_l)$$ from supernova data. By using the cosmic distance duality relation validity, we anchor $$D_{A_l}$$ and $$H_0 D_L(z_l)$$ to infer $$H_0 = 70.55 \pm 7.44$$ km/s/Mpc (68% CL). Our result, though not resolving the Hubble tension, offers a cosmological model-independent consistency check and highlights the potential of using strong lensing and supernovae data via the cosmic distance duality relation to constrain $$H_0$$ . - Open Access
A Joint Analysis of Strong Lensing and Type Ia Supernovae to Determine the Hubble Constant
We present a cosmological model-independent determination of the Hubble constant, $H_0$, by combining time-delay measurements from seven TDCOSMO systems, Einstein radius measurements, and Type Ia Supernovae data sourced from the Pantheon+ sample. For each lens of time-delay system, we calculate the angular diameter distance $D_{A_l}$ using the product $D^{\textrm{Obs}}(z_l) \cdot D_{A,Δt}^{\textrm{Obs}}(z_l, z_s)$, where $D^{\textrm{Obs}}(z_l)$ is reconstructed via Gaussian Processes from 99 Einstein radius measurements, and $D_{A,Δt}^{\textrm{Obs}}(z_l,z_s)$ is the time-delay angular distance. We also reconstruct the unanchored luminosity distance $H_0 D_L(z_l)$ from supernova data. By using the cosmic distance duality relation validity, we anchor $D_{A_l}$ and $H_0 D_L(z_l)$ to infer $H_0 = 70.55 \pm 7.44$ km/s/Mpc (68\% CL). Our result, though not resolving the Hubble tension, offers a cosmological model-independent consistency check and highlights the potential of using strong lensing and supernovae data via the cosmic distance duality relation to constrain $H_0$.Open AccessA Joint Analysis of Strong Lensing and Type Ia Supernovae to Determine the Hubble Constant
We present a cosmological model-independent determination of the Hubble constant, $H_0$, by combining time-delay measurements from seven TDCOSMO systems, Einstein radius measurements, and Type Ia Supernovae data sourced from the Pantheon+ sample. For each lens of time-delay system, we calculate the angular diameter distance $D_{A_l}$ using the product $D^{\textrm{Obs}}(z_l) \cdot D_{A,Δt}^{\textrm{Obs}}(z_l, z_s)$, where $D^{\textrm{Obs}}(z_l)$ is reconstructed via Gaussian Processes from 99 Einstein radius measurements, and $D_{A,Δt}^{\textrm{Obs}}(z_l,z_s)$ is the time-delay angular distance. We also reconstruct the unanchored luminosity distance $H_0 D_L(z_l)$ from supernova data. By using the cosmic distance duality relation validity, we anchor $D_{A_l}$ and $H_0 D_L(z_l)$ to infer $H_0 = 70.55 \pm 7.44$ km/s/Mpc (68\% CL). Our result, though not resolving the Hubble tension, offers a cosmological model-independent consistency check and highlights the potential of using strong lensing and supernovae data via the cosmic distance duality relation to constrain $H_0$. - 1 January 2025
- Published by IOP Publishing in Journal of Cosmology and Astroparticle Physics
- Vol. 2025 (01)
High-redshift cosmography with a possible cosmic distance duality relation violation
In this study, we used geometric distances at high redshifts (both luminosity and angular) to perform a cosmographic analysis with the Padé method, which stabilizes the behaviour of the cosmographic series in this redshift regime. However, in our analyses, we did not assume the validity of the Cosmic Distance Duality Relation (CDDR), but allowed for potential violations, such as d L (z) = η(z)(1+z)2 d A (z), where three different functional forms of η(z) are considered. By incorporating updated data from supernovae (SN), baryon acoustic oscillations (BAO), and cosmic chronometers (CC), we obtained observational constraints on cosmographic models alongside possible CDDR violations. Interestingly, we found that potential CDDR violations introduce new statistical correlations among cosmographic parameters such as H 0, q 0, and j 0. Nonetheless, within this framework, we did not observe significant deviations from the CDDR, and our results remain consistent with the predictions of the ΛCDM model. In the same time, this work provides a novel and straightforward method for testing the CDDR by fixing the background evolution through cosmographic techniques, paving the way for new geometric observational tests of possible deviations from standard cosmology.
- 1 January 2025
- Published by IOP Publishing in Journal of Cosmology and Astroparticle Physics
- Vol. 2025 (01)
High-redshift cosmography with a possible cosmic distance duality relation violation
In this study, we used geometric distances at high redshifts (both luminosity and angular) to perform a cosmographic analysis with the Padé method, which stabilizes the behaviour of the cosmographic series in this redshift regime. However, in our analyses, we did not assume the validity of the Cosmic Distance Duality Relation (CDDR), but allowed for potential violations, such as d L (z) = η(z)(1+z)2 d A (z), where three different functional forms of η(z) are considered. By incorporating updated data from supernovae (SN), baryon acoustic oscillations (BAO), and cosmic chronometers (CC), we obtained observational constraints on cosmographic models alongside possible CDDR violations. Interestingly, we found that potential CDDR violations introduce new statistical correlations among cosmographic parameters such as H 0, q 0, and j 0. Nonetheless, within this framework, we did not observe significant deviations from the CDDR, and our results remain consistent with the predictions of the ΛCDM model. In the same time, this work provides a novel and straightforward method for testing the CDDR by fixing the background evolution through cosmographic techniques, paving the way for new geometric observational tests of possible deviations from standard cosmology.
- Open Access
- 28 October 2024
- Published by Springer Nature in The European Physical Journal C
- Vol. 84 (10) , 1-10
Non-parametric reconstruction of the fine structure constant with galaxy clusters
Testing possible variations in fundamental constants of nature is a crucial endeavor in observational cosmology. This paper investigates potential cosmological variations in the fine structure constant ( $$\alpha $$ ) through a non-parametric approach, using galaxy cluster observations as the primary cosmological probe. We employ two methodologies based on galaxy cluster gas mass fraction measurements derived from X-ray and Sunyaev–Zeldovich observations, along with luminosity distances from type Ia supernovae. We also explore how different values of the Hubble constant ( $$H_0$$ ) impact the variation of $$\alpha $$ across cosmic history. When using the Planck satellite’s $$H_0$$ observations, a constant $$\alpha $$ is ruled out at approximately the 3 $$\sigma $$ confidence level for $$z \lesssim 0.5$$ . Conversely, employing local estimates of $$H_0$$ restores agreement with a constant $$\alpha $$ .- 28 October 2024
- Published by Springer Nature in The European Physical Journal C
- Vol. 84 (10) , 1-10
Open AccessNon-parametric reconstruction of the fine structure constant with galaxy clusters
Testing possible variations in fundamental constants of nature is a crucial endeavor in observational cosmology. This paper investigates potential cosmological variations in the fine structure constant ( $$\alpha $$ ) through a non-parametric approach, using galaxy cluster observations as the primary cosmological probe. We employ two methodologies based on galaxy cluster gas mass fraction measurements derived from X-ray and Sunyaev–Zeldovich observations, along with luminosity distances from type Ia supernovae. We also explore how different values of the Hubble constant ( $$H_0$$ ) impact the variation of $$\alpha $$ across cosmic history. When using the Planck satellite’s $$H_0$$ observations, a constant $$\alpha $$ is ruled out at approximately the 3 $$\sigma $$ confidence level for $$z \lesssim 0.5$$ . Conversely, employing local estimates of $$H_0$$ restores agreement with a constant $$\alpha $$ . - 17 September 2024
- Published by Elsevier in Astroparticle Physics
- Vol. 165
Non-parametric analysis for the dark matter density evolution
- 17 September 2024
- Published by Elsevier in Astroparticle Physics
- Vol. 165
Non-parametric analysis for the dark matter density evolution