170 citations · 791 across the 18 of their papers we have counts for
19 papers
Rapid Methods for Modeling Overdensities of Massive Neutrinos and Other Non-Cold Relics
Keduse Worku, Nashwan Sabti, Marc Kamionkowski
Recent work has highlighted the potentially detectable gravitational-lensing effect of neutrino halos on cosmic-microwave-background (CMB) fluctuations with upcoming instruments li…
A Generative Modeling Approach to Reconstructing 21-cm Tomographic Data
Nashwan Sabti, Ram Reddy, Julian B. Muñoz +2
Analyses of the cosmic 21-cm signal are hampered by astrophysical foregrounds that are far stronger than the signal itself. These foregrounds, typically confined to a wedge-shaped…
The First Billion Years in Seconds: An Effective Model for the 21-cm Signal with Population III Stars
Hector Afonso G. Cruz, Julian B. Munoz, Nashwan Sabti +1
Observations of the 21-cm signal are opening a window to the cosmic-dawn epoch, when the first stars formed. These observations are usually interpreted with semi-numerical or hydro…
Unveiling Neutrino Halos with CMB Lensing
Selim C. Hotinli, Nashwan Sabti, Jaxon North +1
The existence of a cosmic neutrino background has been inferred indirectly from cosmological surveys through its effect on the linear-theory evolution of primordial density perturb…
Breaking degeneracies in the first galaxies with clustering
Julian B. Muñoz, Jordan Mirocha, Steven Furlanetto +1
The high-redshift galaxy UV luminosity function (UVLF) has become essential for understanding the formation and evolution of the first galaxies. Yet, UVLFs only measure galaxy abun…
Insights from HST into Ultra-Massive Galaxies and Early-Universe Cosmology
Nashwan Sabti, Julian B. Muñoz, Marc Kamionkowski
The early-science observations made by the James Webb Space Telescope (JWST) have revealed an excess of ultra-massive galaxy candidates that appear to challenge the standard cosmol…
Snowmass2021 Cosmic Frontier White Paper: Dark Matter Physics from Halo Measurements
Keith Bechtol, Simon Birrer, Francis-Yan Cyr-Racine +41
The non-linear process of cosmic structure formation produces gravitationally bound overdensities of dark matter known as halos. The abundances, density profiles, ellipticities, an…
Cosmic Neutrino Background Detection in Large-Neutrino-Mass Cosmologies
James Alvey, Miguel Escudero, Nashwan Sabti +1
The Cosmic Neutrino Background (CNB) is a definite prediction of the standard cosmological model and its direct discovery would represent a milestone in cosmology and neutrino phys…
What can CMB observations tell us about the neutrino distribution function?
James Alvey, Miguel Escudero, Nashwan Sabti
Cosmic Microwave Background (CMB) observations have been used extensively to constrain key properties of neutrinos, such as their mass. However, these inferences are typically depe…
EuCAPT White Paper: Opportunities and Challenges for Theoretical Astroparticle Physics in the Next Decade
R. Alves Batista, M. A. Amin, G. Barenboim +134
Astroparticle physics is undergoing a profound transformation, due to a series of extraordinary new results, such as the discovery of high-energy cosmic neutrinos with IceCube, the…
GALLUMI: A Galaxy Luminosity Function Pipeline for Cosmology and Astrophysics
Nashwan Sabti, Julian B. Muñoz, Diego Blas
Observations of high-redshift galaxies have provided us with a rich tool to study the physics at play during the epoch of reionisation. The luminosity function (LF) of these object…
New Roads to the Small-Scale Universe: Measurements of the Clustering of Matter with the High-Redshift UV Galaxy Luminosity Function
Nashwan Sabti, Julian B. Muñoz, Diego Blas
The epochs of cosmic dawn and reionisation present promising avenues for understanding the role of dark matter (DM) in our cosmos. The first galaxies that populated the Universe du…
Addendum: Refined bounds on MeV-scale thermal dark sectors from BBN and the CMB
Nashwan Sabti, James Alvey, Miguel Escudero +2
Very recently, the LUNA collaboration has reported a new measurement of the reaction rate, which plays an important role in the prediction of the primord…
When FIMPs Decay into Neutrinos: The Story
Alexey Boyarsky, Maksym Ovchynnikov, Nashwan Sabti +1
The existence of feebly interacting massive particles (FIMPs) could have significant implications on the effective number of relativistic species in the early Univ…
New Constraints on the Mass of Fermionic Dark Matter from Dwarf Spheroidal Galaxies
James Alvey, Nashwan Sabti, Victoria Tiki +7
Dwarf spheroidal galaxies are excellent systems to probe the nature of fermionic dark matter due to their high observed dark matter phase-space density. In this work, we review, re…
First Constraints on Small-Scale Non-Gaussianity from UV Galaxy Luminosity Functions
Nashwan Sabti, Julian B. Muñoz, Diego Blas
UV luminosity functions provide a wealth of information on the physics of galaxy formation in the early Universe. Given that this probe indirectly tracks the evolution of the mass…
An Extended Analysis of Heavy Neutral Leptons during Big Bang Nucleosynthesis
Nashwan Sabti, Andrii Magalich, Anastasiia Filimonova
Heavy Neutral Leptons (HNLs) are strongly motivated by theory due to their capability of simultaneously explaining the observed phenomena of dark matter, neutrino oscillations and…
Refined Bounds on MeV-scale Thermal Dark Sectors from BBN and the CMB
Nashwan Sabti, James Alvey, Miguel Escudero +2
New light states thermally coupled to the Standard Model plasma alter the expansion history of the Universe and impact the synthesis of the primordial light elements. In this work,…
Improved BBN Constraints on the Variation of the Gravitational Constant
James Alvey, Nashwan Sabti, Miguel Escudero +1
Big Bang Nucleosynthesis (BBN) is very sensitive to the cosmological expansion rate. If the gravitational constant took a different value during the nucleosynthesis epoch than…