Zobrazeno 1 - 10
of 173
pro vyhledávání: '"Yoo, Jaiyul"'
Autor:
Yoo, Jaiyul, Eisenstein, Daniel
Galaxy clustering provides a powerful way to probe cosmology. This requires understanding of the background mean density of galaxy samples, which is estimated from the survey itself by averaging the observed galaxy number density over the angular pos
Externí odkaz:
http://arxiv.org/abs/2410.00951
We study the effects of long wavelength entropy fluctuations on cosmological probes such as galaxy clustering, luminosity distance, and CMB temperature anisotropies. Specifically, we consider fluctuations of a massless spectator scalar field set up i
Externí odkaz:
http://arxiv.org/abs/2408.03684
Autor:
Espenshade, Peter, Yoo, Jaiyul
The Lagrangian perturbation theory (LPT) provides a simple yet powerful way of computing the nonlinear matter power spectrum, and it has been applied to biased tracers such as halos and galaxies. The number conservation of matter particles allows a s
Externí odkaz:
http://arxiv.org/abs/2403.07046
Autor:
Magi, Matteo, Yoo, Jaiyul
Publikováno v:
Phys. Rev. D 109, 123535 (2024)
Cosmological probes constructed in large-scale surveys are independent of the underlying theory of gravity, and their relativistic descriptions are indeed applicable to any theory of gravity. It was shown that the presence of fluctuations with wavele
Externí odkaz:
http://arxiv.org/abs/2401.15143
Autor:
Magi, Matteo, Yoo, Jaiyul
Publikováno v:
Phys.Lett.B 846 (2023) 138204
Large-scale surveys allow us to construct cosmological probes such as galaxy clustering, weak gravitational lensing, the luminosity distance, and cosmic microwave background anisotropies. The gauge-invariant descriptions of these cosmological probes
Externí odkaz:
http://arxiv.org/abs/2306.09406
Autor:
Espenshade, Peter, Yoo, Jaiyul
Publikováno v:
ApJ 953 163 (2023)
Surveys with a narrow field-of-view can play an important role in probing cosmology, but inferences from these surveys suffer from large sample variance, arising from random fluctuations around the cosmic mean. The standard method for computing the s
Externí odkaz:
http://arxiv.org/abs/2304.09191
Publikováno v:
Phys.Lett.B 843 (2023) 137998
The relativistic effects in cosmological observables contain critical information about the initial conditions and gravity on large scales. Compared to the matter density fluctuation, some of these relativistic contributions scale with negative power
Externí odkaz:
http://arxiv.org/abs/2302.00427
Autor:
Yoo, Jaiyul
Publikováno v:
JCAP 10 (2023) 054
The standard model for galaxy bias is built in a Newtonian framework, and several attempts have been made in the past to put it in a relativistic framework. The focus of past works was, however, to use the same Newtonian formulation, but to provide i
Externí odkaz:
http://arxiv.org/abs/2212.03573
Autor:
Baumgartner, Sandra, Yoo, Jaiyul
Publikováno v:
JCAP 08 (2022) 077
Recent analysis of the Planck measurements opened a possibility that we live in a non-flat universe. Given the renewed interest in non-zero spatial curvature, here we re-visit the light propagation in a non-flat universe and provide the gauge-invaria
Externí odkaz:
http://arxiv.org/abs/2205.12973
Autor:
Mitsou, Ermis, Yoo, Jaiyul
Publikováno v:
Class. Quant. Grav. 39 (2022) no. 21, 217003
In recent years new types of coordinate transformations have appeared in cosmology on top of the standard gauge transformations, such as the dilatations and special conformal transformations, or the ones leading to (conformal) Fermi coordinates. Some
Externí odkaz:
http://arxiv.org/abs/2205.01544