Publications (54)
Snowmass 2021 CMB-S4 White Paper
Kevork Abazajian, Arwa Abdulghafour, Graeme E. Addison +353
This Snowmass 2021 White Paper describes the Cosmic Microwave Background Stage 4 project CMB-S4, which is designed to cross critical thresholds in our understanding of the origin a…
Messengers from the Early Universe: Cosmic Neutrinos and Other Light Relics
Daniel Green, Mustafa A. Amin, Joel Meyers +136
The hot dense environment of the early universe is known to have produced large numbers of baryons, photons, and neutrinos. These extreme conditions may have also produced other lo…
CMB-S4 Science Book, First Edition
Kevork N. Abazajian, Peter Adshead, Zeeshan Ahmed +83
This book lays out the scientific goals to be addressed by the next-generation ground-based cosmic microwave background experiment, CMB-S4, envisioned to consist of dedicated teles…
A cosmic microwave background search for fine-structure constant evolution
Hurum Maksora Tohfa, Jack Crump, Ethan Baker +4
In some extensions of the standard model of particle physics, the values of the fundamental coupling constants vary in space and time. Some observations of quasars hint at time and…
Lower Limit to the Scale of an Effective Theory of Gravitation
R. R. Caldwell, Daniel Grin
We consider a linearized, effective quantum theory of gravitation in which gravity weakens at energies higher than ~10^-3 eV in order to accommodate the apparent smallness of the c…
A search for ultra-light axions using precision cosmological data
Renée Hlozek, Daniel Grin, David J. E. Marsh +1
Ultra-light axions (ULAs) with masses in the range 10^{-33} eV <m <10^{-20} eV are motivated by string theory and might contribute to either the dark-matter or dark-energy density…
Baryons still trace dark matter: probing CMB lensing maps for hidden isocurvature
Tristan L. Smith, Julian B. Muñoz, Rhiannon Smith +2
Compensated isocurvature perturbations (CIPs) are primordial fluctuations that balance baryon and dark-matter isocurvature to leave the total matter density unperturbed. The effect…
Snowmass2021 CMB-HD White Paper
HD Collaboration, Simone Aiola, Yashar Akrami +61
CMB-HD is a proposed millimeter-wave survey over half the sky that would be ultra-deep (0.5 uK-arcmin) and have unprecedented resolution (15 arcseconds at 150 GHz). Such a survey w…
Constraining Ultralight Axions with Galaxy Surveys
Alex Laguë, J. Richard Bond, Renée Hložek +3
Ultralight axions and other bosons are dark matter candidates present in many high energy physics theories beyond the Standard Model. In particular, the string axiverse postulates…
Report of the Topical Group on Cosmic Probes of Dark Matter for Snowmass 2021
Alex Drlica-Wagner, Chanda Prescod-Weinstein, Hai-Bo Yu +37
Cosmological and astrophysical observations currently provide the only robust, positive evidence for dark matter. Cosmic probes of dark matter, which seek to determine the fundamen…
A Telescope Search for Decaying Relic Axions
Daniel Grin, Giovanni Covone, Jean-Paul Kneib +3
A search for optical line emission from the two-photon decay of relic axions was conducted in the galaxy clusters Abell 2667 and 2390, using spectra from the VIMOS (Visible Multi-O…
Extreme Axions Unveiled: a Novel Fluid Approach for Cosmological Modeling
Harrison Winch, Renee Hlozek, David J. E. Marsh +2
Axion-like particles (ALPs) are a well-motivated dark matter candidate that solve some of the problems in the clustering of large scale structure in cosmology. ALPs are often descr…
Using HI observations of low-mass galaxies to test ultra-light axion dark matter
James T. Garland, Karen L. Masters, Daniel Grin
We evaluate recent and upcoming low-redshift neutral hydrogen (HI) surveys as a cosmological probe of small scale structure with a goal of determining the survey criteria necessary…
CMB-S4: Forecasting Constraints on Primordial Gravitational Waves
S4 Collaboration, Kevork Abazajian, Graeme E. Addison +233
CMB-S4---the next-generation ground-based cosmic microwave background (CMB) experiment---is set to significantly advance the sensitivity of CMB measurements and enhance our underst…
Accurate method for ultralight axion CMB and matter power spectra
Rayne Liu, Wayne Hu, Daniel Grin
Ultralight axions (ULAs) with masses are well motivated in string-inspired models and can be part or all of the dark energy or the…
Ultra-light axions and the kinetic Sunyaev-Zel'dovich Effect
Gerrit S. Farren, Daniel Grin, Andrew H. Jaffe +2
Measurements of secondary cosmic microwave background (CMB) anisotropies, such as the Sunyaev-Zel'dovich (SZ) effect, will enable new tests of neutrino and dark sector properties.…
CMB-S4: Forecasting Constraints on Through -distortion Anisotropy
David Zegeye, Federico Bianchini, J. Richard Bond +14
Diffusion damping of the cosmic microwave background (CMB) power spectrum results from imperfect photon-baryon coupling in the pre-recombination plasma. At redshift $5 \times 10^4…
Snowmass2021 Cosmic Frontier White Paper: Observational Facilities to Study Dark Matter
Sukanya Chakrabarti, Alex Drlica-Wagner, Ting S. Li +21
We present an overview of future observational facilities that will significantly enhance our understanding of the fundamental nature of dark matter. These facilities span a range…
Lensing Bias to CMB Measurements of Compensated Isocurvature Perturbations
Chen He Heinrich, Daniel Grin, Wayne Hu
Compensated isocurvature perturbations (CIPs) are modes in which the baryon and dark matter density fluctuations cancel. They arise in the curvaton scenario as well as some models…
Cosmological hydrogen recombination: The effect of extremely high-n states
Daniel Grin, Christopher M. Hirata
Calculations of cosmological hydrogen recombination are vital for the extraction of cosmological parameters from cosmic microwave background (CMB) observations, and for imposing co…
Using the Full Power of the Cosmic Microwave Background to Probe Axion Dark Matter
Renée Hlozek, David J. E. Marsh, Daniel Grin
The cosmic microwave background (CMB) places strong constraints on models of dark matter (DM) that deviate from standard cold DM (CDM), and on initial conditions beyond the scalar…
A Random Walk Model for Dark Matter Halo Concentrations
Turner Johnson, Andrew J. Benson, Daniel Grin
For idealized (spherical, smooth) dark matter halos described by single-parameter density profiles (such as the NFW profile) there exists a one-to-one mapping between the energy of…
Gravitational probes of ultra-light axions
Daniel Grin, Mustafa A. Amin, Vera Gluscevic +5
The axion is a hypothetical, well-motivated dark-matter particle whose existence would explain the lack of charge-parity violation in the strong interaction. In addition to this or…
How sound are our ultra-light axion approximations?
Tessa Cookmeyer, Daniel Grin, Tristan L. Smith
Ultra-light axions (ULAs) are a promising dark-matter candidate. ULAs may have implications for small-scale challenges to the CDM model, and arise in string scenarios. ULAs are…
Tensor Detection Severely Constrains Axion Dark Matter
David J. E. Marsh, Daniel Grin, Renee Hlozek +1
The recent detection of B-modes by BICEP2 has non-trivial implications for axion dark matter implied by combining the tensor interpretation with isocurvature constraints from Planc…
Cosmological tests of an axiverse-inspired quintessence field
Razieh Emami, Daniel Grin, Josef Pradler +2
Inspired by the string axiverse idea, it has been suggested that the recent transition from decelerated to accelerated cosmic expansion is driven by an axion-like quintessence fiel…
Future CMB tests of dark matter: ultra-light axions and massive neutrinos
Renée Hložek, David J. E. Marsh, Daniel Grin +3
Measurements of cosmic microwave background (CMB) anisotropies provide strong evidence for the existence of dark matter and dark energy. They can also test its composition, probing…
Spectral distortions from the dissipation of tensor perturbations
Jens Chluba, Liang Dai, Daniel Grin +2
Spectral distortions of the cosmic microwave background (CMB) may become a powerful probe of primordial perturbations at small scales. Existing studies of spectral distortions focu…
Probing early-universe phase transitions with CMB spectral distortions
Mustafa A. Amin, Daniel Grin
Global, symmetry-breaking phase transitions in the early universe can generate scaling seed networks which lead to metric perturbations. The acoustic waves in the photon-baryon pla…
Cosmological Probes of Dark Matter Interactions: The Next Decade
Vera Gluscevic, Yacine Ali-Haimoud, Keith Bechtol +16
Cosmological observations offer unique and robust avenues for probing the fundamental nature of dark matter particles-they broadly test a range of compelling theoretical scenarios,…
CMB-S4 Decadal Survey APC White Paper
Kevork Abazajian, Graeme Addison, Peter Adshead +222
We provide an overview of the science case, instrument configuration and project plan for the next-generation ground-based cosmic microwave background experiment CMB-S4, for consid…
Search for Compensated Isocurvature Perturbations with Planck Power Spectra
Julian B. Muñoz, Daniel Grin, Liang Dai +2
In the standard inflationary scenario, primordial perturbations are adiabatic. The amplitudes of most types of isocurvature perturbations are generally constrained by current data…
Compensated isocurvature perturbations in the curvaton model
Chen He, Daniel Grin, Wayne Hu
Primordial fluctuations in the relative number densities of particles, or isocurvature perturbations, are generally well constrained by cosmic microwave background (CMB) data. A le…
Snowmass2021 Cosmic Frontier: Cosmic Microwave Background Measurements White Paper
Clarence L. Chang, Kevin M. Huffenberger, Bradford A. Benson +128
This is a solicited whitepaper for the Snowmass 2021 community planning exercise. The paper focuses on measurements and science with the Cosmic Microwave Background (CMB). The CMB…
Axiverse cosmology and the energy scale of inflation
David J. E. Marsh, Daniel Grin, Renée Hlozek +1
Ultra-light axions (eV), motivated by string theory, can be a powerful probe of the energy scale of inflation. In contrast to heavier axions the isocurvature…
Compensated Isocurvature Perturbations and the Cosmic Microwave Background
Daniel Grin, Olivier Doré, Marc Kamionkowski
Measurements of cosmic microwave background (CMB) anisotropies constrain isocurvature fluctuations between photons and non-relativistic particles to be sub-dominant to adiabatic fl…
Fuzzy Dark Matter Constraints from the Hubble Frontier Fields
Jackson Sipple, Adam Lidz, Daniel Grin +1
In fuzzy dark matter (FDM) cosmologies, the dark matter consists of ultralight bosons ( eV). The astrophysically large de Broglie wavelengths of such particles h…
Searching for vector dark matter with an optomechanical accelerometer
Jack Manley, Mitul Dey Chowdhury, Daniel Grin +2
We consider using optomechanical accelerometers as resonant detectors for ultralight dark matter. As a concrete example, we describe a detector based on a silicon nitride membrane…
An improved estimator for non-Gaussianity in cosmic microwave background observations
Tristan L. Smith, Daniel Grin, Marc Kamionkowski
An improved estimator for the amplitude fnl of local-type non-Gaussianity from the cosmic microwave background (CMB) bispectrum is discussed. The standard estimator is constructed…
Baryons do trace dark matter 380,000 years after the big bang: Search for compensated isocurvature perturbations with WMAP 9-year data
Daniel Grin, Duncan Hanson, Gilbert Holder +2
Primordial isocurvature fluctuations between photons and either neutrinos or non-relativistic species such as baryons or dark matter are known to be sub-dominant to adiabatic fluct…
Fuzzy Dark Matter and the Dark Energy Survey Year 1 Data
Mona Dentler, David J. E. Marsh, Renée Hložek +3
Gravitational weak lensing by dark matter halos leads to a measurable imprint in the shear correlation function of galaxies. Fuzzy dark matter (FDM), composed of ultralight axion-l…
Probing a panoply of curvaton-decay scenarios using CMB data
Tristan L. Smith, Daniel Grin
In the curvaton scenario, primordial curvature perturbations are produced by a second field that is sub-dominant during inflation. Depending on how the curvaton decays [possibly pr…
Radiative transfer effects in primordial hydrogen recombination
Yacine Ali-Haïmoud, Daniel Grin, Christopher M. Hirata
The calculation of a highly accurate cosmological recombination history has been the object of particular attention recently, as it constitutes the major theoretical uncertainty wh…
Fuzzy Dark Matter Halo Mass Functions at Cosmic Dawn
Raghunath Ghara, Adam Lidz, Daniel Grin +1
In fuzzy dark matter (FDM) cosmological models, wave effects impact astrophysical length scales, suppressing the abundance of small mass dark matter halos, and delaying the earlies…
Searching for scalar dark matter with compact mechanical resonators
Jack Manley, Russell Stump, Dalziel Wilson +2
We explore the viability of laboratory-scale mechanical resonators as detectors for ultralight scalar dark matter. The signal we investigate is an atomic strain due to modulation o…
Probing spatial variation of the fine-structure constant using the CMB
Tristan L. Smith, Daniel Grin, David Robinson +1
The fine-structure constant, , controls the strength of the electromagnetic interaction. There are extensions of the standard model in which is dynamical on cosmological l…
CMB spectral distortions from small-scale isocurvature fluctuations
Jens Chluba, Daniel Grin
The damping of primordial perturbations at small scales gives rise to distortions of the cosmic microwave background (CMB). Here, the dependence of the distortion on the different…
Do baryons trace dark matter in the early universe?
Daniel Grin, Olivier Doré, Marc Kamionkowski
Baryon-density perturbations of large amplitude may exist if they are compensated by dark-matter perturbations so that the total density remains unchanged. Big-bang nucleosynthesis…
Dark Matter Physics from the CMB-S4 Experiment
Cora Dvorkin, Renée Hlozek, Rui An +10
The nature of dark matter is one of the major puzzles of fundamental physics, integral to the understanding of our universe across almost every epoch. The search for dark matter ta…
Cosmological implications of ultra-light axion-like fields
Vivian Poulin, Tristan L. Smith, Daniel Grin +2
Cosmological observations are used to test for imprints of an ultra-light axion-like field (ULA), with a range of potentials set by the axion-field v…
Thermal axion constraints in non-standard thermal histories
Daniel Grin, Tristan Smith, Marc Kamionkowski
There is no direct evidence for radiation domination prior to big-bang nucleosynthesis, and so it is useful to consider how constraints to thermally-produced axions change in non-s…
Dark Matter Science in the Era of LSST
Keith Bechtol, Alex Drlica-Wagner, Kevork N. Abazajian +177
Astrophysical observations currently provide the only robust, empirical measurements of dark matter. In the coming decade, astrophysical observations will guide other experimental…
Axion constraints in non-standard thermal histories
Daniel Grin, Tristan L. Smith, Marc Kamionkowski
It is usually assumed that dark matter is produced during the radiation dominated era. There is, however, no direct evidence for radiation domination prior to big-bang nucleosynthe…
CMB-S4 Science Case, Reference Design, and Project Plan
Kevork Abazajian, Graeme Addison, Peter Adshead +222
We present the science case, reference design, and project plan for the Stage-4 ground-based cosmic microwave background experiment CMB-S4.