148 citations · 596 across the 20 of their papers we have counts for
20 papers
Imprints of primordial magnetic fields in gravitational collapse during early structure formation
Jennifer Schober, Molly Abramson, Sayan Mandal +2
Context. Primordial magnetic fields (PMFs) generated in the early Universe might have left observable imprints on present-day large-scale structure. However, the spatial scales on…
Forward cascade of large-scale primordial magnetic fields during structure formation
Molly Abramson, Emma Clarke, Tina Kahniashvili +3
The origin of large scale magnetic fields in the Universe is widely thought to be from early Universe processes, like inflation or phase transitions. These magnetic fields evolve v…
Observational Constraints on Dynamical Dark Energy Models
Olga Avsajanishvili, Gennady Y. Chitov, Tina Kahniashvili +2
CDM models provide an alternative to the standard CDM paradigm, while being physically better motivated. These models lead to a time-dependent speed of sound for dark energy…
Mass-varying Dark Matter from a Phase Transition
Sayan Mandal, Neelima Sehgal
We propose a mass-varying dark matter (MVDM) model consisting of a scalar field and a fermionic field interacting via a simple Yukawa coupling, and containing an exponential self-i…
Report of the Topical Group on Dark Energy and Cosmic Acceleration: Complementarity of Probes and New Facilities for Snowmass 2021
Brenna Flaugher, Vivian Miranda, David J. Schlegel +27
The mechanism(s) driving the early- and late-time accelerated expansion of the Universe represent one of the most compelling mysteries in fundamental physics today. The path to und…
Snowmass2021 CMB-HD White Paper
HD Collaboration, Simone Aiola, Yashar Akrami +61
CMB-HD is a proposed millimeter-wave survey over half the sky that would be ultra-deep (0.5 uK-arcmin) and have unprecedented resolution (15 arcseconds at 150 GHz). Such a survey w…
Finding Evidence for Inflation and the Origin of Galactic Magnetic Fields with CMB Surveys
Sayan Mandal, Neelima Sehgal, Toshiya Namikawa
The origin of the G magnetic fields observed in galaxies is unknown. One promising scenario is that magnetic fields generated during inflation, larger than 0.1 nG on Mpc scales,…
Polarization of gravitational waves from helical MHD turbulent sources
Alberto Roper Pol, Sayan Mandal, Axel Brandenburg +1
We use direct numerical simulations of decaying primordial hydromagnetic turbulence with helicity to compute the resulting gravitational wave (GW) production and its degree of circ…
The scalar, vector, and tensor modes in gravitational wave turbulence simulations
Axel Brandenburg, Grigol Gogoberidze, Tina Kahniashvili +3
We study the gravitational wave (GW) signal sourced by primordial turbulence that is assumed to be present at cosmological phase transitions like the electroweak and quantum chromo…
Circular Polarization of Gravitational Waves from Early-Universe Helical Turbulence
Tina Kahniashvili, Axel Brandenburg, Grigol Gogoberidze +2
We perform direct numerical simulations to compute the net circular polarization of gravitational waves from helical (chiral) turbulent sources in the early Universe for a variety…
Primordial magnetic helicity evolution with a homogeneous magnetic field from inflation
Axel Brandenburg, Ruth Durrer, Yiwen Huang +3
Motivated by a scenario of magnetogenesis in which a homogeneous magnetic field is generated during inflation, we study the magnetohydrodynamic evolution of the primordial plasma m…
Mass varying neutrinos with different quintessence potentials
Sayan Mandal, Gennady Y. Chitov, Olga Avsajanishvili +2
The mass-varying neutrino scenario is analyzed for three trial quintessence potentials (Ferreira-Joyce, inverse exponential, and thawing oscillating). The neutrino mass is generate…
Numerical Simulations of Gravitational Waves from Early-Universe Turbulence
Alberto Roper Pol, Sayan Mandal, Axel Brandenburg +2
We perform direct numerical simulations of magnetohydrodynamic turbulence in the early universe and numerically compute the resulting stochastic background of gravitational waves a…
Magnetism in the Early Universe
Tina Kahniashvili, Axel Brandenburg, Arthur Kosowsky +2
Blazar observations point toward the possible presence of magnetic fields over intergalactic scales of the order of up to Mpc, with strengths of at least G…
E and B polarizations from inhomogeneous and solar surface turbulence
Axel Brandenburg, Andrea Bracco, Tina Kahniashvili +4
Gradient- and curl-type or E- and B-type polarizations have been routinely analyzed to study the physics contributing to the cosmic microwave background polarization and galactic f…
The timestep constraint in solving the gravitational wave equations sourced by hydromagnetic turbulence
A. Roper Pol, A. Brandenburg, T. Kahniashvili +2
Hydromagnetic turbulence produced during phase transitions in the early universe can be a powerful source of stochastic gravitational waves (GWs). GWs can be modelled by the linear…
Observationally inferred dark matter phase-space distribution and direct detection experiments
Sayan Mandal, Subhabrata Majumdar, Vikram Rentala +1
We present a detailed analysis of the effect of an observationally determined dark matter (DM) velocity distribution function (VDF) of the Milky Way (MW) on DM direct detection rat…
Statistical Properties of Scale-Invariant Helical Magnetic Fields and Applications to Cosmology
Axel Brandenburg, Ruth Durrer, Tina Kahniashvili +2
We investigate the statistical properties of isotropic, stochastic, Gaussian distributed, helical magnetic fields characterized by different shapes of the energy spectra at large l…
Evolution of hydromagnetic turbulence from the electroweak phase transition
Axel Brandenburg, Tina Kahniashvili, Sayan Mandal +3
We present new simulations of decaying hydromagnetic turbulence for a relativistic equation of state relevant to the early universe. We compare helical and nonhelical cases either…
The dynamo effect in decaying helical turbulence
Axel Brandenburg, Tina Kahniashvili, Sayan Mandal +3
We show that in decaying hydromagnetic turbulence with initial kinetic helicity, a weak magnetic field eventually becomes fully helical. The sign of magnetic helicity is opposite t…