384 citations · 3.3k across the 60 of their papers we have counts for
17 papers · 1 filter
Relic Gravitational Waves from the Chiral Plasma Instability in the Standard Cosmological Model
Axel Brandenburg, Emma Clarke, Tina Kahniashvili +2
In the primordial plasma, at temperatures above the scale of electroweak symmetry breaking, the presence of chiral asymmetries is expected to induce the development of helical hype…
Measures of non-Gaussianity in axion-string-induced CMB birefringence
Ray Hagimoto, Andrew J. Long
The presence of axion strings in the Universe after recombination can leave an imprint on the polarization pattern of the cosmic microwave background radiation through the phenomen…
Cosmological gravitational particle production of massive spin-2 particles
Edward W. Kolb, Siyang Ling, Andrew J. Long +1
The phenomenon of cosmological gravitational particle production (CGPP) is expected to occur during the period of inflation and the transition into a hot big bang cosmology. Partic…
Searching for axion-like particles through CMB birefringence from string-wall networks
Mudit Jain, Ray Hagimoto, Andrew J. Long +1
Axion-like particles (ALPs) can form a network of cosmic strings and domain walls that survives after recombination and leads to anisotropic birefringence of the cosmic microwave b…
CMB birefringence from ultra-light axion string networks
Mudit Jain, Andrew J. Long, Mustafa A. Amin
The polarization of Cosmic Microwave Background (CMB) photons is rotated as they pass through (ultralight-) axion string loops. Studying this birefringence can reveal valuable info…
Superheavy scalar dark matter from gravitational particle production in -attractor models of inflation
Siyang Ling, Andrew J. Long
We study the phenomenon of gravitational particle production as applied to a scalar spectator field in the context of -attractor inflation. Assuming that the scalar has a minima…
Completely Dark Photons from Gravitational Particle Production During Inflation
Edward W. Kolb, Andrew J. Long
Starting with the de Broglie--Proca Lagrangian for a massive vector field, we calculate the number density of particles resulting from gravitational particle production (GPP) durin…
Tests of Dark MACHOs: Lensing, Accretion, and Glow
Yang Bai, Andrew J. Long, Sida Lu
Dark matter could take the form of dark massive compact halo objects (dMACHOs); i.e., composite objects that are made up of dark-sector elementary particles, that could have a macr…
Neutrino Mass Priors for Cosmology from Random Matrices
Andrew J. Long, Marco Raveri, Wayne Hu +1
Cosmological measurements of structure are placing increasingly strong constraints on the sum of the neutrino masses, , through Bayesian inference. Because these constraints…
Superheavy dark matter through Higgs portal operators
Rocky W. Kolb, Andrew J. Long
The WIMPzilla hypothesis is that the dark matter is a super-weakly-interacting and super-heavy particle. Conventionally, the WIMPzilla abundance is set by gravitational particle pr…
Baryogenesis from Decaying Magnetic Helicity
Kohei Kamada, Andrew J. Long
As a result of the Standard Model chiral anomalies, baryon number is violated in the early universe in the presence of a hypermagnetic field with varying helicity. We investigate w…
Sound Speed and Viscosity of Semi-Relativistic Relic Neutrinos
Lawrence M. Krauss, Andrew J. Long
Generalized fluid equations, using sound speed and viscosity as effective parameters, provide a convenient phenomenological formalism for testing th…
Morphology of blazar-induced gamma ray halos due to a helical intergalactic magnetic field
Andrew J. Long, Tanmay Vachaspati
We study the characteristic size and shape of idealized blazar-induced cascade halos in the energy range assuming various non-helical and helical configuration…
Is Higgs Inflation Dead?
Jessica L. Cook, Lawrence M. Krauss, Andrew J. Long +1
We consider the status of Higgs Inflation in light of the recently announced detection of B-modes in the polarization of the cosmic microwave background radiation by the BICEP2 col…
Leptogenesis and Primordial Magnetic Fields
Andrew J. Long, Eray Sabancilar, Tanmay Vachaspati
The anomalous conversion of leptons into baryons during leptogenesis is shown to produce a right-handed helical magnetic field; in contrast, the magnetic field produced during elec…
Cosmological Constant, Dark Matter, and Electroweak Phase Transition
Daniel J. H. Chung, Andrew J. Long
Accepting the fine tuned cosmological constant hypothesis, we have recently proposed that this hypothesis can be tested if the dark matter freeze out occurs at the electroweak scal…
Probing the Cosmological Constant and Phase Transitions with Dark Matter
Daniel J. H. Chung, Andrew J. Long, Lian-Tao Wang
The Standard Model and its extensions predict multiple phase transitions in the early universe. In addition to the electroweak phase transition, one or several of these could occur…