Did JWST observe imprints of axion miniclusters or primordial black holes? [PDF]
Physical Review D, 2022 The James Webb Space Telescope has detected surprisingly luminous early galaxies that indicate a tension with the $\Lambda$CDM. Motivated by scenarios including axion miniclusters or primordial black holes, we consider power-law modifications of the ...
G. Hütsi +4 more
semanticscholar +1 more source
Astroparticle Constraints from Cosmic Reionization and Primordial Galaxy Formation
Universe, 2022 We derived astroparticle constraints in different dark matter scenarios that are alternatives to cold dark matter (CDM): thermal relic warm dark matter, WDM; fuzzy dark matter, ψDM; self-interacting dark matter, SIDM; sterile neutrino dark matter, νDM ...
Andrea Lapi +6 more
doaj +1 more source
Indications for a Nonzero Lepton Asymmetry from Extremely Metal-Poor Galaxies. [PDF]
Physical Review Letters, 2022 The recent measurement of helium-4 from the near-infrared spectroscopy of extremely metal-poor galaxies by the Subaru Survey may point to a new puzzle in the early Universe.
Anne-Katherine Burns, T. Tait, M. Valli
semanticscholar +1 more source
The Origin of the Large Magellanic Cloud Globular Cluster NGC 2005
The Astronomical Journal, 2023 The ancient Large Magellanic Cloud (LMC) globular cluster NGC 2005 has recently been reported to have an ex situ origin, thus, setting precedents that the LMC could have partially formed from smaller merged dwarf galaxies.
Andrés E. Piatti, Yutaka Hirai
doaj +1 more source
New constraints on primordial features from the galaxy two-point correlation function [PDF]
Physical Review D, 2022 Features in the primordial power spectrum represent the imprinted signal in the density perturbations of the physics and evolution of the early Universe.
M. Ballardini +4 more
semanticscholar +1 more source
Halo/galaxy bispectrum with equilateral-type primordial trispectrum [PDF]
Physical Review D, 2015 We investigate the effect of equilateral-type primordial trispectrum on the halo/galaxy bispectrum. We consider three types of equilateral primordial trispectra which are generated by quartic operators naturally appeared in the effective field theory of inflation and can be characterized by three non-linearity parameters, $g_{\rm NL} ^{\dot ^4}$, $g_{\
Mizuno, Shuntaro, Yokoyama, Shuichiro
openaire +2 more sources
Clustercentric Distance or Local Density? It Depends on Galaxy Morphology
The Astrophysical Journal, 2023 Determining which between projected local density and distance from the cluster center plays a major role in regulating morphological fractions in clusters is a longstanding debate.
Benedetta Vulcani +8 more
doaj +1 more source
Optimizing primordial non-Gaussianity measurements from galaxy surveys [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 8 pages, 4 ...
Mueller, Eva-Maria +2 more
openaire +4 more sources
Probing the Nature of the First Galaxies with JWST and ALMA
The Astrophysical Journal Letters, 2023 By implementing a model of primordial dust emission, we predict dust-continuum fluxes for massive galaxy sources similar to those recently detected by James Webb Space Telescope (JWST) at z ≳ 7.
María Emilia De Rossi, Volker Bromm
doaj +1 more source
Reheating in Runaway Inflation Models via the Evaporation of Mini Primordial Black Holes [PDF]
Galaxies, 2021 We investigate the cosmology of mini Primordial Black Holes (PBHs) produced by large density perturbations that collapse during a stiff fluid domination phase. Such a phase can be realized by a runaway-inflaton model that crosses an inflection point or a
I. Dalianis, G. Kodaxis
semanticscholar +1 more source