43 citations · 165 across the 21 of their papers we have counts for
24 papers
Evolution of neutrino distributions under repeated electron scattering
Jens Chluba, Bryce Cyr, Michiru Uwabo-Niibo +1
We study the energy redistribution of neutrinos by repeated elastic scattering with an isotropic thermal bath of free electrons. Starting from the relevant Boltzmann collision inte…
FOSSIL: A future mission for CMB spectral distortion measurements
N. Aghanim, B. Maffei, J. Aumont +96
We present FOSSIL, a proposed space mission which is designed to deliver unprecedented absolute spectroscopic measurements of the sky intensity over a broad frequency range (50GHz…
Peering Beyond the Veil of Last Scattering: A View of the Universe with CMB Spectral Distortions
Bryce Cyr, Nabila Aghanim, Ethan Baker +37
The frequency spectrum of the cosmic microwave background is the most precise blackbody ever measured in nature, with deviations constrained at the level of almost one part per mil…
Neutrino-electron scattering kernels in isotropic media
Jens Chluba, Bryce Cyr, Michiru Uwabo-Niibo +1
In the early universe, neutrinos undergo many interactions with the particles in the plasma. Key processes are the scattering of neutrinos by free electrons and positrons. In this…
Spectral distortion anisotropies from photon to dark photon conversions
Sara Evangelista, Jens Chluba, Bryce Cyr
Dark photons are a gauge boson of a hypothetical dark sector, representing one of the most-studied minimal extensions of the Standard Model, with wide-ranging theoretical and obser…
CMB Spectral Distortions from Resonant Conversions in Atomic Dark Sectors
Duncan K. Adams, Jared Barron, Bryce Cyr +1
Dark sectors consisting of atomic constituents (electrons, protons, and photons) offer a well-motivated extension to the Standard Model while providing multiple avenues for phenome…
UV Luminosity Functions from HST and JWST: A Possible Resolution to the High-Redshift Galaxy Abundance Puzzle and Implications for Cosmic Strings
Mattéo Blamart, Adrian Liu, Robert Brandenberger +2
Recent observations of high redshift galaxies by the James Webb Space Telescope suggest the presence of a bright population of galaxies that is more abundant than predicted by most…
Not-quite-primordial black holes seeded by cosmic string loops
Bryce Cyr
Cosmic strings appear in many well-motivated extensions to the standard model of particle physics. If they exist, an abundant population of compact objects known as cosmic string l…
Near-Peak Spectrum of Gravitational Waves from Collapsing Domain Walls
Bryce Cyr, Steven Cotterill, Richard Battye
Cosmological domain walls appear in many well-motivated extensions to the standard model of particle physics. If produced, they quickly enter into a self-similar scaling regime, wh…
Revisiting Constraints on Resonant Axion-Photon Conversions from CMB Spectral Distortions
Bryce Cyr, Jens Chluba, Pranav Bharadwaj Gangrekalve Manoj
Axions and axion-like particles (ALPs) remain highly motivated extensions to the standard model due to their ability to address open questions such as the relic abundance of dark m…
Revisiting Dark Photon Constraints from CMB Spectral Distortions
Jens Chluba, Bryce Cyr, Matthew C. Johnson
Spectral distortions of the cosmic microwave background (CMB) provide stringent constraints on energy and entropy production in the post-BBN (Big Bang Nucleosynthesis) era. This ha…
CMB Spectral Distortions: A Multimessenger Probe of the Primordial Universe
Bryce Cyr
The frequency spectrum of the cosmic microwave background (CMB) is a relatively untapped source of data which can allow us to peer beyond the surface of last scattering. Small devi…
Soft Photon Heating: A Semi-Analytic Framework and Applications to cm Cosmology
Bryce Cyr, Sandeep Kumar Acharya, Jens Chluba
The presence of an abundant population of low frequency photons at high redshifts (such as a radio background) can source leading order effects on the evolution of the matter and s…
Disentangling the primordial nature of stochastic gravitational wave backgrounds with CMB spectral distortions
Bryce Cyr, Thomas Kite, Jens Chluba +5
The recent detection of a stochastic gravitational wave background (SGWB) at nanohertz frequencies by pulsar timing arrays (PTAs) has sparked a flurry of interest. Beyond the stand…
Constraining broad photon spectrum injections from exotic and astrophysical sources
Sandeep Kumar Acharya, Bryce Cyr, Jens Chluba
We study the evolution of photon injections with a power-law type spectrum inserted at various epochs of the universe, and obtain constraints on their parameter space from multiple…
Accretion onto Oscillating Cosmic String Loops
Hao Jiao, Bryce Cyr, Robert Brandenberger
Cosmic string loops are non-linear density fluctuations which form in the early universe and could play an important role in explaining many phenomena which are in tension with the…
A cosmic string solution to the radio synchrotron background
Bryce Cyr, Jens Chluba, Sandeep Kumar Acharya
We investigate the low-frequency spectral emission from a network of superconducting cosmic string loops in hopes of explaining the observed radio synchrotron background. After con…
Constraints on the spectral signatures of superconducting cosmic strings
Bryce Cyr, Jens Chluba, Sandeep Kumar Acharya
If they exist, networks of superconducting cosmic strings are capable of injecting copious amounts of electromagnetic energy into the background over a broad range of frequencies.…
The role of soft photon injection and heating in 21 cm cosmology
Sandeep Kumar Acharya, Bryce Cyr, Jens Chluba
The ARCADE radio excess and EDGES measurement remain puzzling. A link between the two has been previously considered, however, in this work we highlight an important related effect…
Massive black holes at high redshifts from superconducting cosmic strings
Bryce Cyr, Hao Jiao, Robert Brandenberger
The observation of quasars at high redshifts presents a mystery in the theory of black hole formation. In order to source such objects, one often relies on the presence of heavy se…
Intermediate Mass Black Hole Seeds from Cosmic String Loops
Robert Brandenberger, Bryce Cyr, Hao Jiao
We demonstrate that cosmic string loops may provide a joint resolution of two mysteries surrounding recently observed black holes. For a string tension in an appropriate range, lar…
Constraints on Superconducting Cosmic Strings from the Global -cm Signal before Reionization
Robert Brandenberger, Bryce Cyr, Rui Shi
Electromagnetic radiation from the cusp region of superconducting cosmic strings leads to a radio excess in the photon spectrum in the early universe and can produce a deep absorpt…
On the Possible Enhancement of the Global -cm Signal at Reionization from the Decay of Cosmic String Cusps
Robert Brandenberger, Bryce Cyr, Timothée Schaeffer
We consider cosmic string cusp annihilations as a possible source of enhancement to the global background radiation temperature in -cm photons at reionization. A soft photon sp…
Fast Radio Bursts from the Decay of Cosmic String Cusps
Robert Brandenberger, Bryce Cyr, Aditya Varna Iyer
We explore the possibility that Fast Radio Bursts are due to the annihilation of cusps on cosmic string loops. We compute the energy released in the annihilation events in the radi…