95 citations · 405 across the 26 of their papers we have counts for
27 papers
New astrophysical bounds on ultralight axionlike particles
Nilanjan Banik, Adam J. Christopherson, Pierre Sikivie +1
Motivated by tension between the predictions of ordinary cold dark matter (CDM) and observations at galactic scales, ultralight axionlike particles (ULALPs) with mass of the order…
Relating metric and covariant perturbation theories in gravity
Adam J. Christopherson
Modified theories of gravity have been invoked recently as an alternative to dark energy, in an attempt to explain the apparent accelerated expansion of the universe at the present…
Second-order cosmological perturbation theory and initial conditions for -body simulations
Adam J. Christopherson, Juan Carlos Hidalgo, Cornelius Rampf +1
We use gauge-invariant cosmological perturbation theory to calculate the displacement field that sets the initial conditions for -body simulations. Using first and second-order…
The Rethermalizing Bose-Einstein Condensate of Dark Matter Axions
Nilanjan Banik, Adam Christopherson, Pierre Sikivie +1
The axions produced during the QCD phase transition by vacuum realignment, string decay and domain wall decay thermalize as a result of their gravitational self-interactions when t…
Recombination era magnetic fields from axion dark matter
Nilanjan Banik, Adam J. Christopherson
We introduce a new mechanism for generating magnetic fields in the recombination era. This Harrison-like mechanism utilizes vorticity in baryons that is sourced through the Bose-Ei…
Linear Newtonian perturbation theory from the Schrödinger-Poisson equations
Nilanjan Banik, Adam J. Christopherson, Pierre Sikivie +1
We obtain solutions to the coupled Schrödinger-Poisson equations. The solutions describe the evolution of cold dark matter density perturbations in an otherwise homogeneous expandi…