Large scale anomalies in the CMB and non-Gaussianity in bouncing cosmologies
Sign Up to like & getrecommendations! Published in 2020 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/abc521
Abstract: We propose that several of the anomalies that have been observed at large angular scales in the CMB have a common origin in a cosmic bounce that took place before the inflationary era. The bounce… read more here.
Keywords: large scale; anomalies cmb; non gaussianity; cmb non ... See more keywords
Codifference can detect ergodicity breaking and non-Gaussianity
Sign Up to like & getrecommendations! Published in 2019 at "New Journal of Physics"
DOI: 10.1088/1367-2630/ab13f3
Abstract: We show that the codifference is a useful tool in studying the ergodicity breaking and non-Gaussianity properties of stochastic time series. While the codifference is a measure of dependence that was previously studied mainly in… read more here.
Keywords: codifference; ergodicity breaking; breaking non; non gaussianity ... See more keywords
Enhanced continuous generation of non-Gaussianity through optomechanical modulation
Sign Up to like & getrecommendations! Published in 2019 at "New Journal of Physics"
DOI: 10.1088/1367-2630/ab1b9e
Abstract: We study the non-Gaussian character of quantum optomechanical systems evolving under the fully nonlinear optomechanical Hamiltonian. By using a measure of non-Gaussianity based on the relative entropy of an initially Gaussian state, we quantify the… read more here.
Keywords: generation non; non gaussianity; enhanced continuous; gaussianity optomechanical ... See more keywords
Imprints of Oscillatory Bispectra on Galaxy Clustering
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2018/09/003
Abstract: Long-short mode coupling during inflation, encoded in the squeezed bispectrum of curvature perturbations, induces a dependence of the local, small-scale power spectrum on long-wavelength perturbations, leading to a scale-dependent halo bias. While this scale dependence… read more here.
Keywords: imprints oscillatory; bispectra galaxy; non gaussianity; physics ... See more keywords
Non-Gaussianity from entanglement during inflation
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2019/07/021
Abstract: We compute the bi-spectrum of CMB temperature fluctuations for a state where the metric perturbation $\zeta$ is entangled with a spectator scalar field $\chi$. Novel terms in the cubic $\zeta$ action coupled to the scalar… read more here.
Keywords: non gaussianity; entanglement inflation; cosmology; spectrum ... See more keywords
Gravitational wave anisotropies from primordial black holes
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2020/02/028
Abstract: An observable stochastic background of gravitational waves is generated whenever primordial black holes are created in the early universe thanks to a small-scale enhancement of the curvature perturbation. We calculate the anisotropies and non-Gaussianity of… read more here.
Keywords: non gaussianity; gravitational waves; black holes; gravitational wave ... See more keywords
Relativistic and non-Gaussianity contributions to the one-loop power spectrum
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2020/04/028
Abstract: We compute the one-loop density power spectrum including Newtonian and relativistic contributions, as well as the primordial non-Gaussianity contributions from $f_{\rm NL}$ and $g_{\rm NL}$ in the local configuration. To this end we take solutions… read more here.
Keywords: power spectrum; one loop; non gaussianity; gaussianity contributions ... See more keywords
Local primordial non-Gaussianity in the relativistic galaxy bispectrum
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2021/04/013
Abstract: Next-generation galaxy and 21cm intensity mapping surveys will rely on a combination of the power spectrum and bispectrum for high-precision measurements of primordial non-Gaussianity. In turn, these measurements will allow us to distinguish between various… read more here.
Keywords: galaxy; non gaussianity; order; primordial non ... See more keywords
Primordial non-Gaussianity from G-inflation
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DOI: 10.1088/1475-7516/2021/04/045
Abstract: Enormous information about interactions is contained in the non-Gaussianities of the primordial curvature perturbations, which are essential to break the degeneracy of inflationary models. We study the primordial bispectra for G-inflation models predicting both sharp… read more here.
Keywords: non gaussianity; primordial non; gaussianity; power spectrum ... See more keywords
The persistence of large scale structures. Part I. Primordial non-Gaussianity
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2021/04/061
Abstract: We develop an analysis pipeline for characterizing the topology of large scale structure and extracting cosmological constraints based on persistent homology. Persistent homology is a technique from topological data analysis that quantifies the multiscale topology… read more here.
Keywords: large scale; topology; non gaussianity;
Time-evolution of nonlinear optomechanical systems: interplay of mechanical squeezing and non-Gaussianity
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Physics A: Mathematical and Theoretical"
DOI: 10.1088/1751-8121/ab64d5
Abstract: We solve the time evolution of a nonlinear optomechanical Hamiltonian with arbitrary time-dependent mechanical displacement, mechanical single-mode squeezing and a time-dependent optomechanical coupling up to the solution of two second-order differential equations. The solution is… read more here.
Keywords: time; non gaussianity; state; time evolution ... See more keywords