Article
Astronomy & Astrophysics
G. Parimbelli, G. Scelfo, S. K. Giri, A. Schneider, M. Archidiacono, S. Camera, M. Viel
Summary: This study investigates the impact of mixed dark matter models on large-scale structure observables and builds an emulator to predict the suppression in the matter power spectrum with high precision.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
G. Pordeus-da-Silva, R. C. Batista, L. G. Medeiros
Summary: Using the Reduced Relativistic Gas (RRG) model, the matter power spectrum for Warm Dark Matter (WDM) on small scales is analytically determined, showing that higher order multipoles are negligible under certain conditions. By deriving a Meszaros-like equation and combining solutions from different eras, an expression for WDM perturbations as a function of redshift and wavenumber is obtained, leading to consistent results with observations and measurements of dark matter warmness.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Xiaohan Wu, Julian B. Munoz, Daniel Eisenstein
Summary: We propose a non-parametric halo biasing model that can accurately represent the ratio of halo and mass densities. Our model shows a monotonically increasing halo-to-mass ratio with linear overdensity in the initial Lagrangian space, while the traditional perturbative halo bias model does not guarantee non-negativity of the halo counts. We demonstrate that our non-parametric model can recover the halo power spectra to sub-percent level accuracy for certain halo masses when given a proper smoothing scale to filter the initial density field. However, the recovery of the halo power spectrum is mildly dependent on the smoothing scale and other input parameters. Our findings qualitatively agree with intuitions from extended Press-Schechter theory.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Emil Brinch Holm, Thomas Tram, Steen Hannestad
Summary: Decaying dark matter models can impact the predicted value of the Hubble constant and bridge the discrepancies between CMB inferences and local measurements. In this study, a reevaluation of the warm dark matter decaying model is performed, including the mass of the decaying species, and its ability to alleviate tensions in Hubble and sigma(8) is assessed. The model shows mild improvements but further research is required to fully evaluate its effectiveness.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Markus R. Mosbech, Celine Boehm, Yvonne Y. Y. Wong
Summary: Similar to warm dark matter, many interacting dark matter models predict a suppression of the matter power spectrum due to collisional damping. 21cm line intensity mapping can probe this suppression and set strong limits on dark matter-neutrino scattering. However, precise measurements of the matter power spectrum at high redshifts are needed to distinguish between warm dark matter and interacting scenarios.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Titouan Lazeyras, Alexandre Barreira, Fabian Schmidt
Summary: This study uses forward modeling combined with likelihood from effective-field theory to measure assembly bias in dark matter halos, finding an opposite signal in assembly bias between the tidal bias parameter b(K2) and b(1), with significant impact on the relation between b(K2) and b(1). Future studies are motivated to design better priors on b(K2)(b(1)) for cosmological constraints from galaxy clustering data.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Guillem Domenech, Samuel Passaglia, Sebastien Renaux-Petel
Summary: This study derives the analytical framework to compute the stochastic gravitational wave background induced by small-scale primordial cold dark matter isocurvature fluctuations. It is found that large isocurvature fluctuations can produce observable gravitational wave signals, with a spectrum distinct from adiabatic perturbations. Future gravitational wave detectors are expected to significantly improve constraints on small-scale dark matter isocurvature.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Xin Wang
Summary: The paper studies the statistical evolution of the large-scale structure, with a focus on the joint probability distribution function. The evolution equation of this PDF describing probability conservation and the characteristic curves as effective dynamics are explored. This statistical approach provides valuable insights into scale interactions.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Arnab Paul, Arindam Chatterjee, Anish Ghoshal, Supratik Pal
Summary: The study explores the interaction between dark matter and neutrinos in Lambda CDM cosmology, using the Planck 2018 dataset to constrain these processes. A viable particle dark matter model with dark matter-neutrino interaction is discussed, and the constraints obtained are mapped to the parameter space of the model.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Azadeh Moradinezhad Dizgah, Farnik Nikakhtar, Garrett K. Keating, Emanuele Castorina
Summary: Line intensity mapping is an emerging technique that has the potential to accurately probe signals at different scales and redshifts. By using simulations and modeling, researchers have been able to accurately predict clustering power and stochastic contributions of intensity fluctuations. Furthermore, this technique shows promise in measuring the baryon acoustic oscillations, which has important implications for cosmological studies in the future.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
G. Parimbelli, C. Carbone, J. Bel, B. Bose, M. Calabrese, E. Carella, M. Zennaro
Summary: This article provides an accurate comparison of different methodologies for modeling the nonlinear matter power spectra in the presence of massive neutrinos and dynamical dark energy. The results show that HMcode and ReACT perform better than HALOFIT, while EuclidEmulator2 agrees remarkably well with the simulated spectra in some scenarios. This study highlights the importance of selecting appropriate methods when modeling complex cosmological scenarios.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Andreas Nygaard, Thomas Tram, Steen Hannestad
Summary: This study updates constraints on the simple decaying cold dark matter model with dark radiation, using the latest CMB data to infer new constraints in both short-lived and long-lived regimes. The model's impact on Hubble and sigma 8 tensions is investigated, showing that each decay regime can slightly alleviate a different tension, but not both simultaneously. The study also derives a mapping between short-lived DCDM and a correction to the effective number of massless neutrino species.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Jai-chan Hwang, Hyerim Noh
Summary: This study revisits the relativistic proof of axion's behavior as a zero pressure irrotational fluid and derives density perturbation equations in different gauge conditions. It is found that in the zero-shear gauge and the uniform-curvature gauge, the same equations as in the non-relativistic treatment can be derived, while differences exist in the uniform expansion gauge and the synchronous gauge.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Elena Kozlikin, Robert Lilow, Felix Fabis, Matthias Bartelmann
Summary: By comparing the newly developed particle-based Kinetic Field Theory with the established Eulerian Standard Perturbation Theory, we find that in the non-interacting regime of free-streaming kinematics, Kinetic Field Theory contains a complete resummation of Standard Perturbation Theory, and the exact solution of Kinetic Field Theory cannot be recovered in any finite order of Standard Perturbation Theory. This suggests that Kinetic Field Theory may provide a better starting point for perturbative treatments of non-linear structure formation.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Oliver H. E. Philcox, Alejandro Aviles, Elena Massara
Summary: The study presents one-loop perturbation theory for the power spectrum of the marked density field of matter and biased tracers in real- and redshift-space. The inclusion of one-loop Effective Field Theory terms substantially improves accuracy, with 5% accuracy at z = 1. The theory suggests a reorganization to include all relevant terms for large scales, leading to a sub-percent accurate model with the inclusion of free coefficients.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Irshad Mohammed, Uros Seljak, Zvonimir Vlah
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2017)
Article
Astronomy & Astrophysics
Zhejie Ding, Hee-Jong Seo, Zvonimir Vlah, Yu Feng, Marcel Schmittfull, Florian Beutler
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
Zvonimir Vlah, Martin White
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
Matteo Fasiello, Zvonimir Vlah
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
Shi-Fan Chen, Zvonimir Vlah, Martin White
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
Zvonimir Vlah, Nora Elisa Chisari, Fabian Schmidt
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
Tomohiro Fujita, Valentin Mauerhofer, Leonardo Senatore, Zvonimir Vlah, Raul Angulo
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
Shi-Fan Chen, Zvonimir Vlah, Martin White
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
Shi-Fan Chen, Zvonimir Vlah, Martin White
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
Shi-Fan Chen, Zvonimir Vlah, Martin White
Summary: The Lyα forest is a valuable tool for mapping large-scale structures at high redshifts and constraining the distance-redshift relation. By expanding the large-scale correlations in the Lyα forest as cumulants of the optical depth field and relating it to the density field through bias expansion, a direct connection between observable and matter fluctuation statistics is established. Small-scale physics influences predictions, velocity bias origins, and renormalization of large-scale bias coefficients, with both isotropic and anisotropic contributions receiving input from small-scale physics.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Shi-Fan Chen, Zvonimir Vlah, Emanuele Castorina, Martin White
Summary: In this study, a method for computing the one-loop 2-point function of biased tracers in redshift space is presented using Lagrangian perturbation theory, with a full resummation of long-wavelength displacements and velocities. The model accurately predicts the power spectrum and correlation function of halos and mock galaxies, including baryon acoustic oscillation signal damping due to bulk galaxy motions. The study also compares this full resummation approach with other techniques and discusses the computation of resulting expressions numerically for efficient computation.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Shi-Fan Chen, Zvonimir Vlah, Martin White
Summary: A new method for analyzing the pre-and post-reconstruction galaxy two-point functions of the BOSS survey is presented. The post-reconstruction correlation function accurately measures the distance-redshift relation and expansion history, while the pre-reconstruction power spectrum multipoles constrain the broad-band shape and rate-of-growth of large-scale structure. The technique uses Lagrangian perturbation theory to directly work with the measured data at the level of two-point functions without approximations. Combining galaxies across the full redshift range and both hemispheres, constraints on Omega(m), H-0, and sigma(8) are obtained that are consistent with the Planck primary CMB anisotropy data and recent cosmic shear surveys.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Zvonimir Vlah, Nora Elisa Chisari, Fabian Schmidt
Summary: Intrinsic galaxy alignments play a significant role in the statistics of galaxy shapes. A formalism using spherical tensors to project galaxy shapes onto the flat sky and calculate two-point functions at next-to-leading order, as well as leading-order three-point functions, has been presented. The results are provided in a numerical implementation-friendly format.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Tomohiro Fujita, Zvonimir Vlah
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
Patrick McDonald, Zvonimir Vlah