83 citations · 585 across the 18 of their papers we have counts for
18 papers
Analog vacuum decay from vacuum initial conditions
Alexander C. Jenkins, Jonathan Braden, Hiranya V. Peiris +3
Ultracold atomic gases can undergo phase transitions that mimic relativistic vacuum decay, allowing us to empirically test early-Universe physics in tabletop experiments. We invest…
Dimensional deformation of sine-Gordon breathers into oscillons
José T. Gálvez Ghersi, Jonathan Braden
Oscillons are localized field configurations oscillating in time with lifetimes orders of magnitude longer than their oscillation period. In this paper, we simulate non-travelling…
Mass Renormalization in Lattice Simulations of False Vacuum Decay
Jonathan Braden, Matthew C. Johnson, Hiranya V. Peiris +2
False vacuum decay, a quantum mechanical first-order phase transition in scalar field theories, is an important phenomenon in early universe cosmology. Recently, real-time semi-cla…
Bubble Clustering in Cosmological First Order Phase Transitions
Dalila Pirvu, Jonathan Braden, Matthew C. Johnson
False vacuum decay in quantum mechanical first order phase transitions is a phenomenon with wide implications in cosmology, and presents interesting theoretical challenges. In the…
enics: Vainshtein screening with the finite element method
Jonathan Braden, Clare Burrage, Benjamin Elder +1
Within the landscape of modified theories of gravity, progress in understanding the behaviour of, and developing tests for, screening mechanisms has been hindered by the complexity…
The Impact of Peculiar Velocities on the Estimation of the Hubble Constant from Gravitational Wave Standard Sirens
Constantina Nicolaou, Ofer Lahav, Pablo Lemos +2
In this work we investigate the systematic uncertainties that arise from the calculation of the peculiar velocity when estimating the Hubble constant () from gravitational wav…
Target Neutrino Mass Precision for Determining the Neutrino Hierarchy
Constance Mahony, Boris Leistedt, Hiranya V. Peiris +5
Recent works combining neutrino oscillation and cosmological data to determine the neutrino hierarchy found a range of odds in favour of the normal hierarchy. These results arise f…
Nonlinear Dynamics of the Cold Atom Analog False Vacuum
Jonathan Braden, Matthew C. Johnson, Hiranya V. Peiris +2
We investigate the nonlinear dynamics of cold atom systems that can in principle serve as quantum simulators of false vacuum decay. The analog false vacuum manifests as a metastabl…
A New Semiclassical Picture of Vacuum Decay
Jonathan Braden, Matthew C. Johnson, Hiranya V. Peiris +2
We introduce a new picture of vacuum decay which, in contrast to existing semiclassical techniques, provides a real-time description and does not rely on classically-forbidden tunn…
Gravitational waves from asymmetric oscillon dynamics?
Mustafa A. Amin, Jonathan Braden, Edmund J. Copeland +4
It has been recently suggested that oscillons produced in the early universe from certain asymmetric potentials continue to emit gravitational waves for a number of -folds of ex…
Towards the cold atom analog false vacuum
Jonathan Braden, Matthew C. Johnson, Hiranya V. Peiris +1
Analog condensed matter systems present an exciting opportunity to simulate early Universe models in table-top experiments. We consider a recent proposal for an analog condensed ma…
Accretion of a Symmetry Breaking Scalar Field by a Schwarzschild Black Hole
Dina Traykova, Jonathan Braden, Hiranya V. Peiris
We simulate the behaviour of a Higgs-like field in the vicinity of a Schwarzschild black hole using a highly accurate numerical framework. We consider both the limit of the zero-te…
Constraining cosmological ultra-large scale structure using numerical relativity
Jonathan Braden, Matthew C. Johnson, Hiranya V. Peiris +1
Cosmic inflation, a period of accelerated expansion in the early universe, can give rise to large amplitude ultra-large scale inhomogeneities on distance scales comparable to or la…
Cosmic bubble and domain wall instabilities III: The role of oscillons in three-dimensional bubble collisions
J. Richard Bond, Jonathan Braden, Laura Mersini-Houghton
We study collisions between pairs of bubbles nucleated in an ambient false vacuum. For the first time, we include the effects of small initial (quantum) fluctuations around the ins…
Cosmic bubble and domain wall instabilities II: Fracturing of colliding walls
Jonathan Braden, J. Richard Bond, Laura Mersini-Houghton
We study collisions between nearly planar domain walls including the effects of small initial nonplanar fluctuations. These perturbations represent the small fluctuations that must…
Cosmic bubble and domain wall instabilities I: parametric amplification of linear fluctuations
Jonathan Braden, J. Richard Bond, Laura Mersini-Houghton
This is the first paper in a series where we study collisions of nucleated bubbles taking into account the effects of small initial (quantum) fluctuations in a fully 3+1-dimensiona…
Testing Inflation with Large Scale Structure: Connecting Hopes with Reality
Marcelo Alvarez, Tobias Baldauf, J. Richard Bond +25
The statistics of primordial curvature fluctuations are our window into the period of inflation, where these fluctuations were generated. To date, the cosmic microwave background h…
Reheating the Universe After Multi-Field Inflation
Neil Barnaby, Jonathan Braden, Lev Kofman
We study in detail (p)reheating after multi-field inflation models with a particular focus on N-flation. We consider a variety of different couplings between the inflatons and the…