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CERN Document Server 14 elementer funnet  1 - 10neste  gå til element: Søket tok 1.62 sekunder. 
1.
Observed power spectrum and frequency-angular power spectrum / Raccanelli, Alvise (U. Padua, Dept. Phys. Astron. ; Padua Observ. ; CERN) ; Vlah, Zvonimir (Boskovic Inst., Zagreb ; Cambridge U. ; Cambridge U., KICC)
The two-point summary statistics is one of the most commonly used tools in the study of cosmological structure. Starting from the theoretical power spectrum defined in the 3D volume and obtained via the process of ensemble averaging, we establish the construction of the observed 3D power spectrum, folding the unequal-time information around the average position into the wave modes along the line of sight. [...]
arXiv:2306.00808.- 2023-08-15 - 24 p. - Published in : Phys. Rev. D 108 (2023) 043537 Fulltext: Publication - PDF; 2306.00808 - PDF;
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2.
Asymptotic connection between full- and flat-sky angular correlators / Gao, Zucheng (Cambridge U., KICC ; Cambridge U., Inst. of Astron.) ; Raccanelli, Alvise (Padua U. ; INFN, Padua ; Padua Observ. ; CERN) ; Vlah, Zvonimir (Boskovic Inst., Zagreb ; Cambridge U., KICC ; Cambridge U., DAMTP)
We investigate the connection between the full- and flat-sky angular power spectra. First, we revisit this connection established on the geometric and physical grounds, namely that the angular correlations on the sphere and in the plane (flat-sky approximation) correspond to each other in the limiting case of small angles and a distant observer. [...]
arXiv:2306.02993.- 2023-08-03 - 15 p. - Published in : Phys. Rev. D 108 (2023) 043503 Fulltext: PDF;
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3.
Power spectrum in the cave / Raccanelli, Alvise (Padua U. ; INFN, Padua ; Padua Observ. ; CERN) ; Vlah, Zvonimir (Boskovic Inst., Zagreb ; Cambridge U., KICC ; Cambridge U., DAMTP)
Forthcoming galaxy surveys will provide measurements of galaxy clustering with an unprecedented level of precision, that will require comparably good accuracy. [...]
arXiv:2305.16278. - 25 p.
Fulltext
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4.
Galaxy shape statistics in the effective field theory / Vlah, Zvonimir (Cambridge U., KICC ; Cambridge U., DAMTP ; CERN) ; Chisari, Nora Elisa (Utrecht U.) ; Schmidt, Fabian (Garching, Max Planck Inst.)
Intrinsic galaxy alignments yield an important contribution to the observed statistics of galaxy shapes. The general bias expansion for galaxy sizes and shapes in three dimensions has been recently described by Vlah, Chisari & Schmidt using the general perturbative effective field theory (EFT) framework, in analogy to the clustering of galaxies. [...]
arXiv:2012.04114.- 2021-05-21 - 33 p. - Published in : JCAP 2105 (2021) 061 Fulltext: Vlah_2021_J._Cosmol._Astropart._Phys._2021_061 - PDF; 2012.04114 - PDF;
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5.
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Recent progress in theory of large-scale structure / Vlah, Zvonimir (speaker)
2021 - 1986. Conferences & Workshops; First EuCAPT Annual Symposium External links: Talk details; Event details In : First EuCAPT Annual Symposium
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6.
Redshift-Space Distortions in Lagrangian Perturbation Theory / Chen, Shi-Fan (UC, Berkeley) ; Vlah, Zvonimir (Cambridge U., KICC ; Cambridge U., DAMTP ; CERN) ; Castorina, Emanuele (Milan U. ; CERN) ; White, Martin (UC, Berkeley)
We present the one-loop 2-point function of biased tracers in redshift space computed with Lagrangian perturbation theory, including a full resummation of both long-wavelength (infrared) displacements and associated velocities. The resulting model accurately predicts the power spectrum and correlation function of halos and mock galaxies from two different sets of N-body simulations at the percent level for quasi-linear scales, including the damping of the baryon acoustic oscillation signal due to the bulk motions of galaxies. [...]
arXiv:2012.04636.- 2021-03-29 - 36 p. - Published in : JCAP 2103 (2021) 100 Fulltext: PDF;
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7.
Modeling features in the redshift-space halo power spectrum with perturbation theory / Chen, Shi-Fan (UC, Berkeley) ; Vlah, Zvonimir (CERN) ; White, Martin (UC, Berkeley)
We study the ability of perturbative models with effective field theory contributions and infra-red resummation to model the redshift space clustering of biased tracers in models where the linear power spectrum has "features" -- either imprinted during inflation or induced by non-standard expansion histories. We show that both Eulerian and Lagrangian perturbation theory are capable of reproducing the Fourier space two-point functions of halos up to the non-linear scale from a suite of $4096^3$ particle N-body simulations. [...]
arXiv:2007.00704.- 2020-11-18 - 21 p. - Published in : JCAP 2011 (2020) 035 Fulltext: PDF;
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8.
A Tale of Two Scales: Screening in Large Scale Structure / Fasiello, Matteo (Portsmouth U. ; Stanford U., Appl. Phys. Dept.) ; Vlah, Zvonimir (CERN ; Stanford U., Appl. Phys. Dept.)
The perturbative treatment of dark matter in structure formation relies on the existence of a well-defined expansion parameter, $k/k_{\rm NL}$, with $k_{\rm NL}$ signalling the onset and ultimately the leading role of non-linearities in the system. Cosmologies beyond the {\Lambda}CDM model often come with additional degree(s) of freedom. [...]
arXiv:1811.06089.- 2018 - 4 p. - Published in : (2018) , pp. 343-346 Fulltext: PDF;
In : 53rd Rencontres de Moriond on Cosmology, La Thuile, Italy, 17 - 24 Mar 2018, pp.343-346
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9.
Consistent Modeling of Velocity Statistics and Redshift-Space Distortions in One-Loop Perturbation Theory / Chen, Shi-Fan (UC, Berkeley) ; Vlah, Zvonimir (CERN) ; White, Martin (UC, Berkeley)
The peculiar velocities of biased tracers of the cosmic density field contain important information about the growth of large scale structure and generate anisotropy in the observed clustering of galaxies. Using N-body data, we show that velocity expansions for halo redshift-space power spectra are converged at the percent-level at perturbative scales for most line-of-sight angles $\mu$ when the first three pairwise velocity moments are included, and that the third moment is well-approximated by a counterterm-like contribution. [...]
arXiv:2005.00523; CERN-TH-2020-068.- 2020-07-29 - 59 p. - Published in : JCAP 2007 (2020) 062 Fulltext: PDF;
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10.
Perturbative description of bias tracers using consistency relations of LSS / Fujita, Tomohiro ; Vlah, Zvonimir
We develop a simple formalism of biased tracers that we dub $\mathit{Monkey\ bias}$. In this formalism, a biased tracer field is constructed directly in terms of the linear matter fluctuation field and the set of derivative operators acting on it. [...]
arXiv:2003.10114; CERN-TH-2020-037.- 2020-10-30 - 27 p. - Published in : JCAP 2010 (2020) 059 Fulltext: PDF;
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