TY - UNPB

T1 - Dark Matter Distribution Induced by a Cosmic String Wake in the Nonlinear Regime

AU - Cunha, Disrael

AU - Harnois-Deraps, Joachim

AU - Brandenberger, Robert

AU - Amara, Adam

AU - Refregier, Alexandre

PY - 2018/3/30

Y1 - 2018/3/30

N2 - We study the distribution of dark matter in the nonlinear regime in a
model in which the primordial fluctuations include, in addition to the
dominant primordial Gaussian fluctuations generated by the standard
$\Lambda CDM$ cosmological model, the effects of a cosmic string wake
set up at the time of equal matter and radiation, making use of
cosmological $N$-body simulations. At early times the string wake leads
to a planar overdensity of dark matter. We study how this non-Gaussian
pattern of a cosmic string wake evolves in the presence of the Gaussian
perturbations, making use of wavelet and ridgelet-like statistics
specifically designed to extract string wake signals. At late times the
Gaussian fluctuations disrupt the string wake. We find that for a string
tension of $G \mu = 10^{-7}$, a value just below the current
observational limit, the effects of a string wake can be identified in
the dark matter distribution, using the current level of the statistical
analysis, down to a redshift of $z = 10$.

AB - We study the distribution of dark matter in the nonlinear regime in a
model in which the primordial fluctuations include, in addition to the
dominant primordial Gaussian fluctuations generated by the standard
$\Lambda CDM$ cosmological model, the effects of a cosmic string wake
set up at the time of equal matter and radiation, making use of
cosmological $N$-body simulations. At early times the string wake leads
to a planar overdensity of dark matter. We study how this non-Gaussian
pattern of a cosmic string wake evolves in the presence of the Gaussian
perturbations, making use of wavelet and ridgelet-like statistics
specifically designed to extract string wake signals. At late times the
Gaussian fluctuations disrupt the string wake. We find that for a string
tension of $G \mu = 10^{-7}$, a value just below the current
observational limit, the effects of a string wake can be identified in
the dark matter distribution, using the current level of the statistical
analysis, down to a redshift of $z = 10$.

KW - Astrophysics - Cosmology and Nongalactic Astrophysics

KW - General Relativity and Quantum Cosmology

KW - High Energy Physics - Phenomenology

KW - High Energy Physics - Theory

M3 - Working paper

BT - Dark Matter Distribution Induced by a Cosmic String Wake in the Nonlinear Regime

PB - ArXiv

ER -