Disruption of Cosmic String Wakes by Gaussian Fluctuations

  title={Disruption of Cosmic String Wakes by Gaussian Fluctuations},
  author={Robert Brandenberger and Oscar F. Hern'andez and Disrael Camargo Neves da Cunha},
  journal={Physical Review D},
We study the stability of cosmic string wakes against the disruption by the dominant Gaussian fluctuations which are present in cosmological models. We find that for a string tension given by $G \mu = 10^{-7}$ wakes remain locally stable until a redshift of $z = 6$, and for a value of $G \mu = 10^{-14}$ they are stable beyond a redshift of $z = 20$. We study a global stability criterion which shows that wakes created by strings at times after $t_{eq}$ are identifiable up to the present time… 

Figures from this paper

Dark matter distribution induced by a cosmic string wake in the nonlinear regime
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
Cosmic String Wake Detection using 3D Ridgelet Transformations
Three-dimensional ridgelet statistics are used to search for the signals of cosmic string wakes in the distribution of dark matter. We compare N-body simulations of the dark matter distribution in
Cosmic filaments from cosmic strings
Cosmic strings are generically predicted in many extensions of the Standard Model of particle physics. We propose a new avenue for detecting cosmic strings through their effect on the filamentary
Signature of a cosmic string wake at z=3
  • D. Cunha
  • Physics
    Journal of Cosmology and Astroparticle Physics
  • 2020
In this paper, we describe the results of N-body simulation runs, which include a cosmic string wake of tension Gμ= 4 × 10−8 on top of the usual Λ CDM fluctuations. To obtain a higher resolution of
Extracting the signal of cosmic string wakes from 21-cm observations
A cosmic string wake produces a distinct non-Gaussian signal in 21-cm intensity maps at redshifts above that of reionization. While the string signal is (locally) larger in amplitude than the signal
Searching for cosmic strings in CMB anisotropy maps using wavelets and curvelets
We use wavelet and curvelet transforms to extract signals of cosmic strings from simulated cosmic microwave background (CMB) temperature anisotropy maps, and to study the limits on the cosmic string
Diffusion of massive particles around an Abelian-Higgs string
We study the diffusion of massive particles in the space time of an Abelian Higgs string. The particles in the early universe plasma execute Brownian motion. This motion of the particles is modeled
Information theoretic bounds on cosmic string detection in CMB maps with noise
An information theoretic bound on the detection of the cosmic string tension $G\mu$ from CMB maps in terms of the resolution, noise level and total survey area of the CMB map is derived.
Signal of Cosmic Strings in Cross-Correlation of 21-cm Redshift and CMB Polarization Maps
We study the signal of cosmic string wakes present before the time of reionization in the cross-correlation signal of 21-cm redshift and B-mode CMB polarization maps. The specific non-Gaussian signal
A convolutional neural network for cosmic string detection in CMB temperature maps
We present in detail the convolutional neural network used in our previous work to detect cosmic strings in cosmic microwave background (CMB) temperature anisotropy maps. By training this neural


Signature of cosmic string wakes in the CMB polarization
We calculate a signature of cosmic strings in the polarization of the cosmic microwave background. We find that ionization in the wakes behind moving strings gives rise to extra polarization in a set
Number of cosmic string loops
Using recent simulation results, we provide the mass and speed spectrum of cosmic string loops. This is the quantity of primary interest for many phenomenological signatures of cosmic strings, and it
Spectral Analysis of Microwave Background Perturbations Induced by Cosmic Strings
Using a simple analytic model based on seed superposition we obtain the spectrum of microwave background perturbations induced by cosmic strings on all angular scales larger than about 2 armin. We
Cosmic String Wakes
Accretion of matter onto wakes left behind by horizon-sized pieces of cosmic string is investigated, and the effects of wakes on the large-scale structure of the universe are determined. Accretion of
Searching for Signatures of Cosmic String Wakes in 21cm Redshift Surveys using Minkowski Functionals
Minkowski Functionals are a powerful tool for analyzing large scale structure, in particular if the distribution of matter is highly non-Gaussian, as it is in models in which cosmic strings
The 21 cm signature of cosmic string wakes
We discuss the signature of a cosmic string wake in 21cm redshift surveys. Since 21cm surveys probe higher redshifts than optical large-scale structure surveys, the signatures of cosmic strings are
Angular Power Spectrum of B-mode Polarization from Cosmic String Wakes
Cosmic string wakes produce direct B-mode polarization at leading order in cosmological perturbation theory, as worked out in a previous publication \cite{BDH} in the case of a single string wake.
Updated constraints on the cosmic string tension
We reexamine the constraints on the cosmic string tension from cosmic microwave background (CMB) and matter power spectra, and also from limits on a stochastic background of gravitational waves
Cosmological evolution of cosmic string loops
The existence of a scaling evolution for cosmic string loops in an expanding universe is demonstrated for the first time by means of numerical simulations. In contrast with what is usually assumed,
Wouthuysen-Field absorption trough in cosmic string wakes
The baryon density enhancement in cosmic string wakes leads to a stronger coupling of the spin temperature to the gas kinetic temperate inside these string wakes than in the intergalactic medium