1 code implementation • 8 Dec 2020 • Shi-Fan Chen, Zvonimir Vlah, Emanuele Castorina, Martin White
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 velocities.
Cosmology and Nongalactic Astrophysics
1 code implementation • 1 May 2020 • Shi-Fan Chen, Zvonimir Vlah, Martin White
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.
Cosmology and Nongalactic Astrophysics
1 code implementation • 29 Nov 2019 • Zachary Slepian, Yin Li, Marcel Schmittfull, Zvonimir Vlah
In analysing these datasets recomputation of these integrals a substantial number of times, for instance to update perturbation theory predictions or covariance matrices as the input linear power spectrum is changed, will be one piece in a Monte Carlo Markov Chain cosmological parameter search: thus the overall savings from our method should be significant.
Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics
1 code implementation • 10 Jun 2017 • Chirag Modi, Martin White, Zvonimir Vlah
A new generation of surveys will soon map large fractions of sky to ever greater depths and their science goals can be enhanced by exploiting cross correlations between them.
Cosmology and Nongalactic Astrophysics
3 code implementations • 9 Sep 2016 • Zvonimir Vlah, Emanuele Castorina, Martin White
We compare the ingredients of the GSM to a suite of large N-body simulations, and show the performance of the theory on the low order multipoles of the redshift-space correlation function and power spectrum.
Cosmology and Nongalactic Astrophysics
1 code implementation • 7 Sep 2015 • Zvonimir Vlah, Uroš Seljak, Man Yat Chu, Yu Feng
Shell crossings lead to non-perturbative effects, and the PT ignorance can be quantified in terms of their ratio, which is also the transfer function squared in the absence of stochasticity.
Cosmology and Nongalactic Astrophysics
1 code implementation • 17 Jun 2015 • Zvonimir Vlah, Martin White, Alejandro Aviles
We find that all of our models fare well on scales larger than about two to three times the non-linear scale, but fail as the non-linear scale is approached.
Cosmology and Nongalactic Astrophysics
no code implementations • 7 Oct 2014 • Zvonimir Vlah, Uroš Seljak, Tobias Baldauf
We find that the analytic calculations are in a good agreement with the LPT simulations, but when compared to full N-body simulations, we find that while one loop calculations improve upon the Zel'dovich approximation in the power spectrum, they still significantly lack power.
Cosmology and Nongalactic Astrophysics
