Search Publications
Atacama Cosmology Telescope: Combined kinematic and thermal Sunyaev-Zel'dovich measurements from BOSS CMASS and LOWZ halos
Hilton, Matt; Sifón, Cristóbal; Battaglia, Nicholas +56 more
The scattering of cosmic microwave background (CMB) photons off the free-electron gas in galaxies and clusters leaves detectable imprints on high resolution CMB maps: the thermal and kinematic Sunyaev-Zel'dovich effects (tSZ and kSZ respectively). We use combined microwave maps from the Atacama Cosmology Telescope DR5 and Planck in combination wit…
Atacama Cosmology Telescope: Modeling the gas thermodynamics in BOSS CMASS galaxies from kinematic and thermal Sunyaev-Zel'dovich measurements
Hilton, Matt; Sifón, Cristóbal; Battaglia, Nicholas +52 more
The thermal and kinematic Sunyaev-Zel'dovich effects (tSZ, kSZ) probe the thermodynamic properties of the circumgalactic and intracluster medium (CGM and ICM) of galaxies, groups, and clusters, since they are proportional, respectively, to the integrated electron pressure and momentum along the line of sight. We present constraints on the gas ther…
Near future MeV telescopes can discover asteroid-mass primordial black hole dark matter
Muñoz, Julian B.; Ray, Anupam; Laha, Ranjan +1 more
Primordial black holes (PBHs), formed out of large overdensities in the early Universe, are a viable dark matter (DM) candidate over a broad range of masses. Ultralight, asteroid-mass PBHs with masses around 1017 g are particularly interesting as current observations allow them to constitute the entire DM density. PBHs in this mass rang…
Cosmological constraints from DES Y1 cluster abundances and SPT multiwavelength data
Bacon, D.; Smith, M.; Abbott, T. M. C. +89 more
We perform a joint analysis of the counts of redMaPPer clusters selected from the Dark Energy Survey (DES) year 1 data and multiwavelength follow-up data collected within the 2500 deg2 South Pole Telescope (SPT) Sunyaev-Zel'dovich (SZ) survey. The SPT follow-up data, calibrating the richness-mass relation of the optically selected redMa…
Hubble tension or a transition of the Cepheid SnIa calibrator parameters?
Perivolaropoulos, Leandros; Skara, Foteini
We reanalyze the Cepheid data used to infer the value of the Hubble constant H0 by calibrating type Ia supernovae. We do not enforce a universal value of the empirical Cepheid calibration parameters RW (Cepheid Wesenheit color-luminosity parameter) and MHW (Cepheid Wesenheit H-band absolute magnitude). I…
Primordial black holes and stochastic gravitational wave background from inflation with a noncanonical spectator field
Cai, Rong-Gen; Chen, Chao; Fu, Chengjie
We investigate the enhancement of the curvature perturbations in a single-field slow-roll inflation with a spectator scalar field kinetically coupled to the inflaton. The coupling term with a periodic function of inflaton triggers the exponential growth of the spectator field perturbations, which indirectly amplifies the curvature perturbations to…
Comparing early dark energy and extra radiation solutions to the Hubble tension with BBN
Seto, Osamu; Toda, Yo
A shorter sound horizon scale at the recombination epoch, arising from introducing extra energy components such as extra radiation or early dark energy (EDE), is a simple approach to resolving the so-called Hubble tension. We compare EDE models, an extra radiation model, and a model in which EDE and extra radiation coexist, paying attention to the…
Primordial black holes and scalar-induced secondary gravitational waves from inflationary models with a noncanonical kinetic term
Gao, Qing; Gong, Yungui; Yi, Zhu +1 more
With the enhancement mechanism provided by a noncanonical kinetic term with a peak, the amplitude of primordial curvature perturbations can be enhanced by seven orders of magnitude at small scales while keeping to be consistent with observations at large scales. The peak function and inflationary potential are not restricted in this mechanism. We …
INTEGRAL x-ray constraints on sub-GeV dark matter
Pinetti, Elena; Fornengo, Nicolao; Cirelli, Marco +1 more
Light dark matter (DM), defined here as having a mass between 1 MeV and about 1 GeV, is an interesting possibility both theoretically and phenomenologically, at one of the frontiers of current progress in the field of DM searches. Its indirect detection via gamma rays is challenged by the scarcity of experiments in the MeV-GeV region. We look ther…
Lyman-α constraints on cosmic heating from dark matter annihilation and decay
Slatyer, Tracy R.; Liu, Hongwan; Qin, Wenzer +1 more
We derive new constraints on models of decaying and annihilating dark matter (DM) by requiring that the energy injected into the intergalactic medium (IGM) not overheat it at late times, when measurements of the Lyman-α forest constrain the IGM temperature. We improve upon previous analyses by using the recently developed DarkHistory code package,…