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78 papers
Is Dynamical Dark Energy Necessary? DESI BAO and Modified Recombination
Seyed Hamidreza Mirpoorian, Karsten Jedamzik, Levon Pogosian
Recent measurements of baryon acoustic oscillations (BAO) by the Dark Energy Spectroscopic Instrument (DESI) exhibit a mild-to-moderate tension with cosmic microwave background (CM…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
Hints of Primordial Magnetic Fields at Recombination and Implications for the Hubble Tension
Karsten Jedamzik, Levon Pogosian, Tom Abel
Primordial Magnetic Fields (PMFs), long studied as relics of the early Universe, accelerate recombination and have been proposed as a way to relieve the Hubble tension. However, pr…
Modified recombination and the Hubble tension
Seyed Hamidreza Mirpoorian, Karsten Jedamzik, Levon Pogosian
We investigate the extent to which modifying the ionization history at cosmological recombination can relieve the Hubble tension, taking into account all relevant datasets and cons…
Primordial black hole formation during cosmic phase transitions
Karsten Jedamzik
Primordial black holes (PBHs) may be part of the dark matter. It is shown here that PBHs form more easily during cosmic phase transitions. For approximately scale-invariant primord…
A consistency test of the cosmological model at the epoch of recombination using DESI BAO and Planck measurements
Levon Pogosian, Gong-Bo Zhao, Karsten Jedamzik
The value of the Hubble constant determined from CMB and BAO measurements is directly dependent on the sound horizon at the photon-baryon decoupling. There has been significant int…