Cosmological Inference from within the Peculiar Local Universe

Autor: Roya Mohayaee, Mohamed Rameez, Subir Sarkar

Publikováno v: Universe, Vol 10, Iss 5, p 209 (2024)

The existence of ‘peculiar’ velocities due to the formation of cosmic structure marks a point of discord between the real universe and the usually assumed Friedmann–Lemaítre–Robertson–Walker metric, which accomodates only the smooth Hubble

Externí odkaz: https://doaj.org/article/41475ef353534b5893d3e2b58e2cf6d3

Do supernovae indicate an accelerating universe?

Autor: Subir Sarkar, Roya Mohayaee, Mohamed Rameez

Publikováno v: Eur.Phys.J.ST
Eur.Phys.J.ST, 2021, 230 (9), pp.2067-2076. ⟨10.1140/epjs/s11734-021-00199-6⟩

In the late 1990's, observations of 93 Type Ia supernovae were analysed in the framework of the FLRW cosmology assuming these to be `standard(isable) candles'. It was thus inferred that the Hubble expansion rate is accelerating as if driven by a posi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a373ebf21b6b185ec73783d7d94195f1
https://doi.org/10.1140/epjs/s11734-021-00199-6

Optimal Transport Reconstruction of Baryon Acoustic Oscillations

Autor: Farnik Nikakhtar, Ravi K. Sheth, Bruno Lévy, Roya Mohayaee

Publikováno v: Physical Review Letters
Physical Review Letters, 2022, 129, ⟨10.1103/PhysRevLett.129.251101⟩

A weighted, semi-discrete, fast optimal transport (OT) algorithm for reconstructing the Lagrangian positions of proto-halos from their evolved Eulerian positions is presented. The algorithm makes use of a mass estimate of the biased tracers and of th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bbcdeeb5328a9ad4590925aa85c3e1c2

Fornax globular cluster distributions: implications for the cusp-core problem

Autor: Joseph Silk, Pierre Boldrini, Roya Mohayaee

Publikováno v: Mon.Not.Roy.Astron.Soc.
Mon.Not.Roy.Astron.Soc., 2019, 485 (2), pp.2546-2557. ⟨10.1093/mnras/stz573⟩
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2019, 485 (2), pp.2546-2557. ⟨10.1093/mnras/stz573⟩

We re-investigate the Fornax cusp-core problem using observational results on the spatial and mass distributions of globular clusters (GCs) in order to put constraints on the dark matter profile. We model Fornax using high-resolution N-body simulatio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e0380178c0019c9f5ecf7e13f0eb783d
https://doi.org/10.1093/mnras/stz573

Does Hubble Tension Signal a Breakdown in FLRW Cosmology?

Autor: Mohammad M. Sheikh-Jabbari, Eoin Ó Colgáin, Lu Yin, Roya Mohayaee, Chethan Krishnan

Publikováno v: Classical and Quantum Gravity
Classical and Quantum Gravity, IOP Publishing, 2021, 38 (18), pp.184001. ⟨10.1088/1361-6382/ac1a81⟩

The tension between early and late Universe probes of the Hubble constant has motivated various new FLRW cosmologies. Here, we reanalyse the Hubble tension with a recent age of the Universe constraint. This allows us to restrict attention to matter a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::75d58ec883574a004442c5092173e53f
http://arxiv.org/abs/2105.09790