ΛCDM is alive and well

Autor: Alain Blanchard, Jean-Yves Héloret, Stéphane Ilić, Brahim Lamine, Isaac Tutusaus

Publikováno v: The Open Journal of Astrophysics, Vol 7 (2024)

Despite its successes, the $\Lambda$CDM model faces several tensions with recent cosmological data and their increased accuracy. The mismatch between the values of the Hubble constant $H_0$ obtained from {some} direct distance ladder measurements and

Externí odkaz: https://doaj.org/article/23e89d75b5134f1e9da931d4c3456d24

Introduction of interactive learning into French university physics classrooms

Autor: Alexander L. Rudolph, Brahim Lamine, Michael Joyce, Hélène Vignolles, David Consiglio

Publikováno v: Physical Review Special Topics. Physics Education Research, Vol 10, Iss 1, p 010103 (2014)

We report on a project to introduce interactive learning strategies (ILS) to physics classes at the Université Pierre et Marie Curie, one of the leading science universities in France. In Spring 2012, instructors in two large introductory classes, f

Externí odkaz: https://doaj.org/article/c1c143f731964405aca31eafd5955d03

Time-dependent $G$ in Einstein's equations as an alternative to the cosmological constant

Autor: Isaac Tutusaus, Ekim Taylan Hanımeli, Brahim Lamine, Alain Blanchard

Publikováno v: Phys.Rev.D
Phys.Rev.D, 2020, 101 (6), pp.063513. ⟨10.1103/PhysRevD.101.063513⟩
Digital.CSIC. Repositorio Institucional del CSIC
instname
Physical Review D
Physical Review D, American Physical Society, 2020, 101 (6), pp.063513. ⟨10.1103/PhysRevD.101.063513⟩

In this work, we investigate cosmologies where the gravitational constant varies in time, with the aim of explaining the accelerated expansion without a cosmological constant. We achieve this by considering a phenomenological extension to general rel

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5f02eb53fb0e533ba2b08d6243859650
https://hal.archives-ouvertes.fr/hal-02383316

Model-independent cosmic acceleration and redshift-dependent intrinsic luminosity in type-Ia supernovae

Autor: Alain Blanchard, Isaac Tutusaus, Brahim Lamine

Publikováno v: Astron.Astrophys.
Astron.Astrophys., 2019, 625, pp.A15. ⟨10.1051/0004-6361/201833032⟩
Astronomy & Astrophysics
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2019, 625, pp.A15. ⟨10.1051/0004-6361/201833032⟩
Astronomy and Astrophysics-A&A, EDP Sciences, 2019, 625, pp.A15. ⟨10.1051/0004-6361/201833032⟩

Context. The cosmological concordance model (ΛCDM) is the current standard model in cosmology thanks to its ability to reproduce the observations. The first observational evidence for this model appeared roughly 20 years ago from the type-Ia superno

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b8aeff725c428ce4595b545cec3780c2
https://hal.archives-ouvertes.fr/hal-01758128

Is cosmic acceleration proven by local cosmological probes?

Autor: Brahim Lamine, Alain Blanchard, Isaac Tutusaus, Arnaud Dupays

Publikováno v: Astron.Astrophys.
Astron.Astrophys., 2017, 602, pp.A73. ⟨10.1051/0004-6361/201630289⟩
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 602, pp.A73. ⟨10.1051/0004-6361/201630289⟩
Astronomy and Astrophysics-A&A, 2017, 602, pp.A73. ⟨10.1051/0004-6361/201630289⟩
Astron.Astrophys., 2017, 602, pp.A73. 〈10.1051/0004-6361/201630289〉

Context: The cosmological concordance model ($\Lambda$CDM) matches the cosmological observations exceedingly well. This model has become the standard cosmological model with the evidence for an accelerated expansion provided by the type Ia supernovae

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::962f9bee11e7bc11a224f7d269ab2a32
https://hal.archives-ouvertes.fr/hal-01555194