347 citations · 3k across the 46 of their papers we have counts for
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Less isn't more: Cosmological bounds on the neutrino masses are robust to changes in the neutrino abundance
Sebastian J. Figueroa, Alexander C. Sobotka, Adrienne L. Erickcek
We investigate how neutrino-mass constraints from cosmology depend on the assumed thermal history of the universe. Photon injection after neutrino decoupling would decrease the neu…
21-cm Constraints on Dark Matter Annihilation after an Early Matter-Dominated Era
Hwan Bae, Adrienne L. Erickcek, M. Sten Delos +1
Although it is commonly assumed that relativistic particles dominate the energy density of the universe quickly after inflation, a variety of well-motivated scenarios predict an ea…
Conversations and Deliberations: Non-Standard Cosmological Epochs and Expansion Histories
Brian Batell, Keith R. Dienes, Brooks Thomas +17
This document summarizes the discussions which took place during the PITT-PACC Workshop entitled "Non-Standard Cosmological Epochs and Expansion Histories," held in Pittsburgh, Pen…
Signatures of Very Early Dark Energy in the Matter Power Spectrum
Alexander C. Sobotka, Adrienne L. Erickcek, Tristan L. Smith
Axion-like scalar fields can induce temporary deviations from the standard expansion history of the universe. The scalar field's contribution to the energy density of the universe…
Comprehensive Constraints on Dark Radiation Injection After BBN
Alexander C. Sobotka, Adrienne L. Erickcek, Tristan L. Smith
We derive constraints on the injection of free-streaming dark radiation after big bang nucleosynthesis (BBN) by considering the decay of a massive hidden sector particle into dark…
How an era of kination impacts substructure and the dark matter annihilation rate
M. Sten Delos, Kayla Redmond, Adrienne L. Erickcek
An era of kination occurs when the Universe's energy density is dominated by a fast-rolling scalar field. Dark matter that is thermally produced during an era of kination requires…
The Effects Of Relativistic Hidden Sector Particles on the Matter Power Spectrum
Himanish Ganjoo, Adrienne L. Erickcek, Weikang Lin +1
If dark matter resides in a hidden sector minimally coupled to the Standard Model, another particle within the hidden sector might dominate the energy density of the early universe…
Was Entropy Conserved between BBN and Recombination?
Alexander C. Sobotka, Adrienne L. Erickcek, Tristan L. Smith
We test the assumption of entropy conservation between Big Bang nucleosynthesis and recombination by considering a massive particle that decays into a mixture of photons and other…
Snowmass2021 Cosmic Frontier White Paper: Cosmological Simulations for Dark Matter Physics
Arka Banerjee, Kimberly K. Boddy, Francis-Yan Cyr-Racine +15
Over the past several decades, unexpected astronomical discoveries have been fueling a new wave of particle model building and are inspiring the next generation of ever-more-sophis…
Cannibal domination and the matter power spectrum
Adrienne L. Erickcek, Pranjal Ralegankar, Jessie Shelton
Decoupled hidden sectors can easily and generically result in a period of cannibal domination, during which the dominant component of the Universe has an equation of state intermed…
The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe
Rouzbeh Allahverdi, Mustafa A. Amin, Asher Berlin +23
It is commonly assumed that the energy density of the Universe was dominated by radiation between reheating after inflation and the onset of matter domination 54,000 years later. W…
Breaking a dark degeneracy: The gamma-ray signature of early matter domination
M. Sten Delos, Tim Linden, Adrienne L. Erickcek
The Universe's early thermal history is poorly constrained, and it is possible that it underwent a period of early matter domination driven by a heavy particle or an oscillating sc…
Constraining Nonthermal Dark Matter's Impact on the Matter Power Spectrum
Carisa Miller, Adrienne Erickcek, Riccardo Murgia
The inclusion of a period of (effective) matter domination following inflation and prior to the onset of radiation domination has interesting and observable consequences for struct…
Annihilation Signatures of Hidden Sector Dark Matter Within Early-Forming Microhalos
Carlos Blanco, M. Sten Delos, Adrienne L. Erickcek +1
If the dark matter is part of a hidden sector with only very feeble couplings to the Standard Model, the lightest particle in the hidden sector will generically be long-lived and c…
Predicting the density profiles of the first halos
M. Sten Delos, Margie Bruff, Adrienne L. Erickcek
The first dark matter halos form by direct collapse from peaks in the matter density field, and evidence from numerical simulations and other analyses suggests that the dense inner…
Growth of Dark Matter Perturbations during Kination
Kayla Redmond, Anthony Trezza, Adrienne L. Erickcek
If the Universe's energy density was dominated by a fast-rolling scalar field while the radiation bath was hot enough to thermally produce dark matter, then dark matter with larger…
Density profiles of ultracompact minihalos: Implications for constraining the primordial power spectrum
M. Sten Delos, Adrienne L. Erickcek, Avery P. Bailey +1
Enhanced density fluctuations on small scales would lead to the formation of numerous dark matter minihalos, so limits on the minihalo abundance can place upper bounds on the small…
Are ultracompact minihalos really ultracompact?
M. Sten Delos, Adrienne L. Erickcek, Avery P. Bailey +1
Ultracompact minihalos (UCMHs) have emerged as a valuable probe of the primordial power spectrum of density fluctuations at small scales. UCMHs are expected to form at early times…
Comment on "Kinetic decoupling of WIMPs: Analytic expressions"
Isaac Raj Waldstein, Adrienne L. Erickcek
Visinelli and Gondolo (2015, hereafter VG15) derived analytic expressions for the evolution of the dark matter temperature in a generic cosmological model. They then calculated the…
Quasidecoupled state for dark matter in nonstandard thermal histories
Isaac Raj Waldstein, Adrienne L. Erickcek, Cosmin Ilie
Dark matter drops out of kinetic equilibrium with standard model particles when the momentum-transfer rate equals the expansion rate. In a radiation-dominated universe, this occurs…
Quartic Chameleons: Safely Scale-Free in the Early Universe
Carisa Miller, Adrienne L. Erickcek
In chameleon gravity, there exists a light scalar field that couples to the trace of the stress-energy tensor in such a way that its mass depends on the ambient matter density, and…
Large-scale anomalies in the cosmic microwave background as signatures of non-Gaussianity
Saroj Adhikari, Sarah Shandera, Adrienne L. Erickcek
We derive a general expression for the probability of observing deviations from statistical isotropy in the cosmic microwave background (CMB) if the primordial fluctuations are non…
The Dark Matter Annihilation Boost from Low-Temperature Reheating
Adrienne L. Erickcek
The evolution of the Universe between inflation and the onset of big bang nucleosynthesis is difficult to probe and largely unconstrained. This ignorance profoundly limits our unde…
Chameleons in the Early Universe: Kicks, Rebounds, and Particle Production
Adrienne L. Erickcek, Neil Barnaby, Clare Burrage +1
Chameleon gravity is a scalar-tensor theory that includes a non-minimal coupling between the scalar field and the matter fields and yet mimics general relativity in the Solar Syste…