A Hubble Constant Determination Through Quasar Time Delays and Type Ia Supernovae
This paper presents a new model-independent constraint on the Hubble constant (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>H</mi><mn>0</mn></msub></semantics><...
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2025-03-01
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| author | Leonardo R. Colaço |
| author_facet | Leonardo R. Colaço |
| author_sort | Leonardo R. Colaço |
| collection | DOAJ |
| description | This paper presents a new model-independent constraint on the Hubble constant (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>H</mi><mn>0</mn></msub></semantics></math></inline-formula>) by anchoring relative distances from Type Ia supernovae (SNe Ia) observations to absolute distance measurements from time-delay strong Gravitational Lensing (SGL) systems. The approach only uses the validity of the cosmic distance duality relation (CDDR) to derive constraints on <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>H</mi><mn>0</mn></msub></semantics></math></inline-formula>. By using Gaussian Process (GP) regression to reconstruct the unanchored luminosity distance from the Pantheon+ compilation to match the time-delay angular diameter distance at the redshift of the lenses, one yields a value of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>H</mi><mn>0</mn></msub><mo>=</mo><mn>75.57</mn><mo>±</mo><mn>4.415</mn></mrow></semantics></math></inline-formula> km/s/Mpc at a 68% confidence level. The result aligns well with the local estimate from Cepheid variables within the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>1</mn><mi>σ</mi></mrow></semantics></math></inline-formula> confidence region, indicating consistency with late-universe probes. |
| format | Article |
| id | doaj-art-d8321c2b9f2b46b08a49f29bc27407aa |
| institution | Kabale University |
| issn | 2218-1997 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj-art-d8321c2b9f2b46b08a49f29bc27407aa2025-08-20T03:44:05ZengMDPI AGUniverse2218-19972025-03-011138910.3390/universe11030089A Hubble Constant Determination Through Quasar Time Delays and Type Ia SupernovaeLeonardo R. Colaço0Departamento de Física Teórica e Experimental, Universidade Federal do Rio Grande do Norte, Natal 59300-000, RN, BrazilThis paper presents a new model-independent constraint on the Hubble constant (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>H</mi><mn>0</mn></msub></semantics></math></inline-formula>) by anchoring relative distances from Type Ia supernovae (SNe Ia) observations to absolute distance measurements from time-delay strong Gravitational Lensing (SGL) systems. The approach only uses the validity of the cosmic distance duality relation (CDDR) to derive constraints on <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>H</mi><mn>0</mn></msub></semantics></math></inline-formula>. By using Gaussian Process (GP) regression to reconstruct the unanchored luminosity distance from the Pantheon+ compilation to match the time-delay angular diameter distance at the redshift of the lenses, one yields a value of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>H</mi><mn>0</mn></msub><mo>=</mo><mn>75.57</mn><mo>±</mo><mn>4.415</mn></mrow></semantics></math></inline-formula> km/s/Mpc at a 68% confidence level. The result aligns well with the local estimate from Cepheid variables within the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>1</mn><mi>σ</mi></mrow></semantics></math></inline-formula> confidence region, indicating consistency with late-universe probes.https://www.mdpi.com/2218-1997/11/3/89Hubble constanttime-delay distancesType Ia supernovae |
| spellingShingle | Leonardo R. Colaço A Hubble Constant Determination Through Quasar Time Delays and Type Ia Supernovae Universe Hubble constant time-delay distances Type Ia supernovae |
| title | A Hubble Constant Determination Through Quasar Time Delays and Type Ia Supernovae |
| title_full | A Hubble Constant Determination Through Quasar Time Delays and Type Ia Supernovae |
| title_fullStr | A Hubble Constant Determination Through Quasar Time Delays and Type Ia Supernovae |
| title_full_unstemmed | A Hubble Constant Determination Through Quasar Time Delays and Type Ia Supernovae |
| title_short | A Hubble Constant Determination Through Quasar Time Delays and Type Ia Supernovae |
| title_sort | hubble constant determination through quasar time delays and type ia supernovae |
| topic | Hubble constant time-delay distances Type Ia supernovae |
| url | https://www.mdpi.com/2218-1997/11/3/89 |
| work_keys_str_mv | AT leonardorcolaco ahubbleconstantdeterminationthroughquasartimedelaysandtypeiasupernovae AT leonardorcolaco hubbleconstantdeterminationthroughquasartimedelaysandtypeiasupernovae |