324 citations · 5k across the 89 of their papers we have counts for
91 papers
Constraining exotic dark matter models with the dark ages 21-cm signal
Rajesh Mondal, Rennan Barkana, Anastasia Fialkov
The dark ages 21-cm signal is a powerful tool for precision cosmology and probing new physics. We study two non-standard models: an excess radio background (ERB) model (possibly ge…
Cosmic mysteries and the hydrogen 21-cm line: bridging the gap with lunar observations
Anastasia Fialkov, Thomas Gessey-Jones, Jiten Dhandha
The hydrogen 21-cm signal is predicted to be the richest probe of the young Universe including eras known as the cosmic Dark Ages, the Cosmic Dawn when the first star and black hol…
First upper limits on the 21 cm signal power spectrum from cosmic dawn from one night of observations with NenuFAR
S. Munshi, F. G. Mertens, L. V. E. Koopmans +24
The redshifted 21 cm signal from neutral hydrogen is a direct probe of the physics of the early universe and has been an important science driver of many present and upcoming radio…
Modeling Post-Reionization HI Distributions in Fuzzy Dark Matter Cosmologies Using Conditional Normalizing Flows
Tibor Dome, Rumail Azhar, Anastasia Fialkov
Upcoming 21 cm intensity mapping experiments like the Square Kilometer Array (SKA) hold significant potential to constrain the properties of dark matter. In this work, we model neu…
Population synthesis of Be X-ray binaries: metallicity dependence of total X-ray outputs
Boyuan Liu, Nina S. Sartorio, Robert G. Izzard +1
X-ray binaries (XRBs) are thought to regulate cosmic thermal and ionization histories during the Epoch of Reionization and Cosmic Dawn ().Theoretical predictions of the…
Receiver design for the REACH global 21-cm signal experiment
Ian L. V. Roque, Nima Razavi-Ghods, Steven H. Carey +35
We detail the the REACH radiometric system designed to enable measurements of the 21-cm neutral hydrogen line. Included is the radiometer architecture and end-to-end system simulat…
Mini-quenching of galaxies by bursty star formation
Tibor Dome, Sandro Tacchella, Anastasia Fialkov +5
The recent reported discovery of a low-mass and an intermediate-mass quenched galaxy with JWST/NIRSpec is the first evidence of halted star formation above $z\appro…
Signatures of Cosmic Ray Heating in 21-cm Observables
T. Gessey-Jones, A. Fialkov, E. de Lera Acedo +2
Cosmic rays generated by supernovae carry away a significant portion of the lifetime energy emission of their parent star, making them a plausible mechanism for heating the early u…
Population III X-ray Binaries and their Impact on the Early Universe
Nina S. Sartorio, A. Fialkov, T. Hartwig +8
The first population of X-ray binaries (XRBs) is expected to affect the thermal and ionization states of the gas in the early Universe. Although these X-ray sources are predicted t…
Accurate modelling of the Lyman- coupling for the 21-cm signal, observability with NenuFAR and SKA
Benoit Semelin, Romain Mériot, Florent Mertens +6
The measurement of the cm signal from the Cosmic Dawn is a major goal for several existing and upcoming radio interferometers such as NenuFAR and the SKA. During this era befo…
Cosmological Structure Formation and Soliton Phase Transition in Fuzzy Dark Matter with Axion Self-Interactions
Philip Mocz, Anastasia Fialkov, Mark Vogelsberger +11
We investigate cosmological structure formation in Fuzzy Dark Matter (FDM) with an attractive self-interaction (SI) with numerical simulations. Such a SI would arise if the FDM bos…
Strong 21-cm fluctuations and anisotropy due to the line-of-sight effect of radio galaxies at cosmic dawn
Sudipta Sikder, Rennan Barkana, Anastasia Fialkov +1
The reported detection of the global 21-cm signal by the EDGES collaboration is significantly stronger than standard astrophysical predictions. One possible explanation is an early…
Cosmic Web Dissection in Fuzzy Dark Matter Cosmologies
Tibor Dome, Anastasia Fialkov, Nina Sartorio +1
On large cosmological scales, anisotropic gravitational collapse is manifest in the dark cosmic web. Its statistical properties are little known for alternative dark matter models…
Joint analysis constraints on the physics of the first galaxies with low frequency radio astronomy data
Harry T. J. Bevins, Stefan Heimersheim, Irene Abril-Cabezas +5
The first billion years of cosmic history remains largely unobserved. We demonstrate, using a novel machine learning technique, how combining upper limits on the spatial fluctuatio…
Anticipating a New-Physics Signal in Upcoming 21-cm Power Spectrum Observations
Rennan Barkana, Anastasia Fialkov, Hongwan Liu +1
Dark matter-baryon interactions can cool the baryonic fluid, which has been shown to modify the cosmological 21-cm global signal. We show that in a two-component dark sector with a…
Astrophysical Constraints from the SARAS3 non-detection of the Cosmic Dawn Sky-Averaged 21-cm Signal
H. T. J. Bevins, A. Fialkov, E. de Lera Acedo +4
Observations of the redshifted 21-cm line of atomic hydrogen have resulted in several upper limits on the 21-cm power spectrum and a tentative detection of the sky-averaged signal…
The Second Radio Synchrotron Background Workshop: Conference Summary and Report
J. Singal, N. Fornengo, M. Regis +24
We summarize the second radio synchrotron background workshop, which took place June 15-17, 2022 in Barolo, Italy. This meeting was convened because available measurements of the d…
The REACH radiometer for detecting the 21-cm hydrogen signal from redshift 7.5 to 28
E. de Lera Acedo, D. I. L. de Villiers, N. Razavi-Ghods +31
Observations of the 21-cm line from primordial hydrogen promise to be one of the best tools to study the early epochs of the Universe: the Dark Ages, the Cosmic Dawn, and the subse…
Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations
The HERA Collaboration, Zara Abdurashidova, Tyrone Adams +92
We report the most sensitive upper limits to date on the 21 cm epoch of reionization power spectrum using 94 nights of observing with Phase I of the Hydrogen Epoch of Reionization…
On the Cosmic Web Elongation in Fuzzy Dark Matter Cosmologies: Effects on Density Profiles, Shapes and Alignments of Halos
Tibor Dome, Anastasia Fialkov, Philip Mocz +3
The fuzzy dark matter (FDM) scenario has received increased attention in recent years due to the small-scale challenges of the vanilla Lambda cold dark matter (CDM) cosmological…
Relative baryon-dark matter velocities in cosmological zoom simulations
Luke Conaboy, Ilian T. Iliev, Anastasia Fialkov +2
Supersonic relative motion between baryons and dark matter due to the decoupling of baryons from the primordial plasma after recombination affects the growth of the first small-sca…
Marginal Bayesian Statistics Using Masked Autoregressive Flows and Kernel Density Estimators with Examples in Cosmology
Harry Bevins, Will Handley, Pablo Lemos +3
Cosmological experiments often employ Bayesian workflows to derive constraints on cosmological and astrophysical parameters from their data. It has been shown that these constraint…
Antenna beam characterisation for the global 21cm experiment LEDA and its impact on signal model parameter reconstruction
M. Spinelli, G. Kyriakou, G. Bernardi +4
Cosmic Dawn, the onset of star formation in the early universe, can in principle be studied via the 21cm transition of neutral hydrogen, for which a sky-averaged absorption signal,…
Marginal Post Processing of Bayesian Inference Products with Normalizing Flows and Kernel Density Estimators
Harry T. J. Bevins, William J. Handley, Pablo Lemos +4
Bayesian analysis has become an indispensable tool across many different cosmological fields including the study of gravitational waves, the Cosmic Microwave Background and the 21-…