Article
Astronomy & Astrophysics
Yue Nan, Kazuhiro Yamamoto
Summary: In this study, a dynamical model for dark energy based on an ultralight mass scalar field with large-scale inhomogeneities is considered. The model is found to have observable impacts on the anisotropic properties of the cosmic microwave background (CMB) intensity and luminosity distance. Numerical solutions show that the model can mimic the standard ΛCDM cosmology, including spatially dependent dark energy with flexible ranges of model parameters. Constraints on the amplitude of these inhomogeneities are also put forward through observations of the CMB anisotropies, along with discussions on their influence on the estimation of the luminosity distance.
Article
Astronomy & Astrophysics
R. R. Cuzinatto, R. P. Gupta, R. F. L. Holanda, J. F. Jesus, S. H. Pereira
Summary: In this paper, the Co-varying Physical Couplings (CPC) framework is introduced, which assumes the gravitational quantities can be treated as space-time functions. By imposing specific constraints, the researchers deduce the functional forms of the couplings as functions of redshift, and demonstrate that this model can describe dark energy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Wilmar Cardona, M. A. Sabogal
Summary: Interesting discrepancies in cosmological parameters challenge the success of the ACDM model. The Hubble constant and matter clustering strength derived from various measurements are higher/lower than those inferred from the Cosmic Microwave Background (CMB) in the context of ACDM. In this study, we propose a Dark Energy (DE) model with an evolving equation of state and constant sound speed squared to address these discrepancies. By considering the impact of DE sound speed on gravitational potential evolution, we find good agreement between our results and low redshift probes, but tension with BBN constraints in the case of baryon energy density.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Amin Aboubrahim, Wan-Zhe Feng, Pran Nath, Zhu-Yao Wang
Summary: The study discusses a particle physics model in which dark matter interacts via a dark force with a light dark photon as mediator, explaining the short distance behavior of dark matter at galaxy scales. By studying coupled Boltzmann equations involving two temperatures, the velocity-dependent dark matter cross section is fitted to data from dwarf galaxies to clusters within relic density constraint.
Article
Astronomy & Astrophysics
Artyom Astashenok, Sergei D. Odintsov, V. K. Oikonomou
Summary: By considering the thermal effects induced from Hawking radiation on the apparent horizon of the Universe, various dark energy models were investigated. The study explored the evolution of dark energy density as the Universe expands, leading to different types of singularities, such as sudden future singularities and big rip singularities. The research also looked into the transition between deceleration and acceleration in quintessence dark energy, as well as the potential remedies for crushing-type singularities.
Article
Astronomy & Astrophysics
Daniela Grandon, Victor H. Cardenas
Summary: By analyzing the latest observations on supernovae and the Hubble constant, we investigated the evolution of dark energy density and found a slight deviation from LCDM in the parameterization methods at 1 sigma. Extending the analysis up to 2 sigma, the evidence for the evolution of dark energy density dilutes in both cases.
CLASSICAL AND QUANTUM GRAVITY
(2021)
Article
Astronomy & Astrophysics
Eleonora Di Valentino, Olga Mena
Summary: This paper analyzes the constraints and potential hints obtained for models involving an interaction between the dark matter and dark energy sectors using simulated Planck data. The simulations suggest a potential fake detection for a non-zero interaction among the dark matter and dark energy fluids when dealing with current cosmic microwave background (CMB) Planck measurements alone. Future CMB observations, particularly cosmic variance limited polarization experiments, may provide more reliable cosmological constraints and break existing parameter degeneracies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Keshav Ram Mishra, Shibesh Kumar Jas Pacif, Rajesh Kumar, Kazuharu Bamba
Summary: In this paper, an interacting dark energy model is studied by assuming gravitational interaction between matter fields and dark energy in a spatially homogeneous and isotropic Friedmann-Robertson-Walker space-time. The cosmic evolution is examined in the framework of an interacting scenario using a suitable ansatz for the scale factor parametrization of the Hubble parameter. The evolution of cosmological parameters, including deceleration parameter, energy density, pressure, and equation of state, is discussed in detail. Cosmological tests and analysis are performed to support the obtained interacting model. Additionally, the potential of the scalar field is reconstructed and the refined swampland conjecture is refuted using the equation of state and relationships between energy density, pressure, scalar field, and potential.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Astronomy & Astrophysics
A. Hernandez-Almada, Genly Leon, Juan Magana, Miguel A. Garcia-Aspeitia, V Motta, Emmanuel N. Saridakis, Kuralay Yesmakhanova
Summary: In this study, we investigate Kaniadakis-holographic dark energy by comparing it with observational data. By conducting a Markov Chain Monte Carlo analysis using cosmic chronometers, supernovae type Ia, and Baryon Acoustic Oscillations data, we find that the Kaniadakis parameter is constrained around zero, which is consistent with the standard Bekenstein-Hawking entropy. Additionally, the present matter density parameter Omega((0))(m) is slightly smaller in the Kaniadakis scenario compared to the Lambda CDM model. Furthermore, we reconstruct the evolution of the Hubble, deceleration, and jerk parameters and extract the redshift of the deceleration-acceleration transition.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Matteo Lucca
Summary: The study examines a dynamic fluid model of dark energy that shows promising results in addressing the S-8 tension without significantly impacting other tensions or fit to the data sets.
PHYSICS OF THE DARK UNIVERSE
(2021)
Article
Physics, Mathematical
A. Remya, Pankaj, Umesh Kumar Sharma
Summary: This work explores the cosmological scenario of Barrow holographic dark energy (BHDE) in relation to the time varying deceleration parameter. By investigating the evolution of a spatially flat Friedmann-Robertson-Walker (FRW) universe filled with pressure-less dark matter and BHDE density, the study analyzes the evolutionary history of essential cosmological parameters, such as the deceleration parameter, the equation of state parameter, and the density parameter. Additionally, the study examines the different structures of the model by reconstructing the scalar field potential to describe the universe's accelerated expansion phase.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2022)
Article
Astronomy & Astrophysics
Alvaro de la Cruz Dombriz, Francisco Jose Maldonado Torralba, David F. Mota
Summary: The stable pseudo-scalar degree of freedom in the quadratic Poincare Gauge theory of gravity is identified as a suitable candidate for dark matter. The study determines the parameter space in the theory that can explain all predicted cold dark matter phenomena and constrains these parameters with astrophysical observations.
Article
Astronomy & Astrophysics
S. T. H. Hartman, H. A. Winther, D. F. Mota
Summary: This study obtains constraints on the cosmic history of self-interacting Bose-Einstein condensed (SIBEC) dark matter using various observational data. The results show that in the simplest scenario, the pure SIBEC-DM model is unable to solve the cusp-core problem. However, introducing a transition can relax this constraint, with the transitions preferably occurring after matter-radiation equality and the initial phase being cold.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Albin Joseph, Rajib Saha
Summary: The cosmological models with tracker properties are important for understanding dark energy. This paper focuses on the oscillatory tracker model and uses observational data to constrain its parameters. The results show that the oscillatory tracker dark energy model has noticeable differences from the usual ΛCDM predictions, but there is still a high level of agreement between the two.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Suhail Dhawan, Antonin Borderies, Hayley J. Macpherson, Asta Heinesen
Summary: The cosmological principle is tested using the Type Ia supernova (SN Ia) magnitude-redshift relation. The study finds no significant quadrupole term in the effective Hubble parameter and no significant dipole term in the effective deceleration parameter regardless of the redshift frame used. The results are consistent with theoretical expectations and place upper limits on the quadrupole amplitude.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ellie Kitanidis, Martin White
Summary: Cross-correlations between CMB lensing and large-scale structure tracers offer a unique method to study dark matter growth, break degeneracies in cosmology, and test modified gravity theories. By detecting a significant cross-correlation between DESI-like luminous red galaxies and CMB lensing maps, corrections for magnification bias and galaxy bias were determined, showing excellent agreement with survey expectations. This analysis provides valuable insights into the growth of dark matter and the evolution of large-scale structures.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
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
Martin White, Rongpu Zhou, Joseph DeRose, Simone Ferraro, Shi-Fan Chen, Nickolas Kokron, Stephen Bailey, David Brooks, Juan Garcia-Bellido, Julien Guy, Klaus Honscheid, Robert Kehoe, Anthony Kremin, Michael Levi, Nathalie Palanque-Delabrouille, Claire Poppett, David Schlegel, Gregory Tarle
Summary: Using luminous red galaxies selected from imaging surveys for targeting by the Dark Energy Spectroscopic Instrument (DESI) in combination with CMB lensing maps from the Planck collaboration, researchers probed the amplitude of large-scale structure over 0.4 <= z <= 1. Their findings suggest a slower growth of structure at low redshift than model predictions, with only modest significance.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
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
Yun Wang, Zhongxu Zhai, Anahita Alavi, Elena Massara, Alice Pisani, Andrew Benson, Christopher M. Hirata, Lado Samushia, David H. Weinberg, James Colbert, Olivier Dore, Tim Eifler, Chen Heinrich, Shirley Ho, Elisabeth Krause, Nikhil Padmanabhan, David Spergel, Harry Teplitz
Summary: This article introduces the High Latitude Spectroscopic Survey (HLSS) conducted by the Nancy Grace Roman Space Telescope and its implications for the study of large-scale structures and dark energy. The article presents a reference HLSS, including the scope of the survey, redshift measurements, and performance predictions, and investigates possible design deviations. This information will be valuable for decision-making regarding the final scope and design of the Roman HLSS.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Joseph DeRose, Shi-Fan Chen, Martin White, Nickolas Kokron
Summary: We use neural networks to accelerate the calculation of power spectra for galaxy clustering and weak gravitational lensing analysis. By constructing neural network-based surrogate models, we achieve high accuracy over a broad range of scales and a computation speed 1000 times faster than traditional methods. The release of these surrogate models will facilitate rapid iteration on analysis settings, which is essential for complex large-scale structure analyses.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Zhejie Ding, Chia-Hsun Chuang, Yu Yu, Lehman H. Garrison, Adrian E. Bayer, Yu Feng, Chirag Modi, Daniel J. Eisenstein, Martin White, Andrei Variu, Cheng Zhao, Hanyu Zhang, Jennifer Meneses Rizo, David Brooks, Kyle Dawson, Peter Doel, Enrique Gaztanaga, Robert Kehoe, Alex Krolewski, Martin Landriau, Nathalie Palanque-Delabrouille, Claire Poppett
Summary: DESI aims to map the Universe with a large and precise three-dimensional map, using high-resolution simulations like ABACUSSUMMIT for validation. The CARPool method is proposed for high statistical precision using accurate and approximate simulations, combined with fast quasi-N-body solvers.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Nickolas Kokron, Joseph DeRose, Shi-Fan Chen, Martin White, Risa H. Wechsler
Summary: This study investigates the stochastic properties of typical red galaxy samples in a controlled numerical environment. Using halo occupation distribution (HOD) modelling and Second-order Hybrid Effective Field Theory (HEFT), the researchers directly measure and compare the stochastic power spectra of these samples, and apply the results in cosmological analyses.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Shi-Fan Chen, Martin White, Joseph DeRose, Nickolas Kokron
Summary: We propose a formalism for jointly fitting pre-and post-reconstruction redshift-space clustering, baryon acoustic oscillations, and gravitational lensing. We analyze clustering measured by the Baryon Oscillation Spectroscopic Survey in combination with CMB lensing measured by Planck. The results provide valuable constraints on various cosmological parameters.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Nickolas Kokron, Shi-Fan Chen, Martin White, Joseph DeRose, Mark Maus
Summary: Simulations are essential for accurate modeling of observables in galaxy surveys, but can be expensive when a large dynamic range is required. This study presents a method that combines Lagrangian perturbation theory models with N-body simulations to reduce the effects of finite computational volume on the prediction of ensemble average properties in the simulations. By utilizing the correlation between Zel'dovich displacements and the final density field, the method achieves significant reductions in sample variance for power spectrum or correlation function estimation. It has the potential to extend simulations to larger scales and improve measurements of statistics in simulations that are limited to small volumes.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Noah Sailer, Shi-Fan Chen, Martin White
Summary: The optical depth tau is an important parameter in cosmology, but it is least well determined. Future reionization experiments using symmetries-based bias expansion could provide tight constraints on tau. These experiments would require measuring anisotropies in the power spectrum on large scales. Ionization evolution models can help in constraining the timing and duration of reionization, and hence tau, through next-generation 21 cm surveys.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
A. Amon, N. C. Robertson, H. Miyatake, C. Heymans, M. White, J. DeRose, S. Yuan, R. H. Wechsler, T. N. Varga, S. Bocquet, A. Dvornik, S. More, A. J. Ross, H. Hoekstra, A. Alarcon, M. Asgari, J. Blazek, A. Campos, R. Chen, A. Choi, M. Crocce, H. T. Diehl, C. Doux, K. Eckert, J. Elvin-Poole, S. Everett, A. Ferte, M. Gatti, G. Giannini, D. Gruen, R. A. Gruendl, W. G. Hartley, K. Herner, H. Hildebrandt, S. Huang, E. M. Huff, B. Joachimi, S. Lee, N. MacCrann, J. Myles, A. Navarro-Alsina, T. Nishimichi, J. Prat, L. F. Secco, I Sevilla-Noarbe, E. Sheldon, T. Shin, T. Troster, M. A. Troxel, I Tutusaus, A. H. Wright, B. Yin, M. Aguena, S. Allam, J. Annis, D. Bacon, M. Bilicki, D. Brooks, D. L. Burke, A. Carnero Rosell, J. Carretero, F. J. Castander, R. Cawthon, M. Costanzi, L. N. da Costa, M. E. S. Pereira, J. de Jong, J. De Vicente, S. Desai, J. P. Dietrich, P. Doel, I Ferrero, J. Frieman, J. Garcia-Bellido, D. W. Gerdes, J. Gschwend, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. Huterer, A. Kannawadi, K. Kuehn, N. Kuropatkin, O. Lahav, M. Lima, M. A. G. Maia, J. L. Marshall, F. Menanteau, R. Miquel, J. J. Mohr, R. Morgan, J. Muir, F. Paz-Chinchon, A. Pieres, A. A. Plazas Malagon, A. Porredon, M. Rodriguez-Monroy, A. Roodman, E. Sanchez, S. Serrano, H. Shan, E. Suchyta, M. E. C. Swanson, G. Tarle, D. Thomas, C. To, Y. Zhang
Summary: We evaluate the consistency between lensing and clustering by combining measurements from Baryon Oscillation Spectroscopic Survey, DES Year 3, HSC Year 1, and KiDS-1000. Good agreement is found between these lensing data sets. Two fixed cosmologies, Planck and Lensing cosmology, are used to fit the data, and both provide an acceptable fit at large scales. However, uncertainties in baryon feedback and assembly bias hinder the full utilization of small-scale measurements.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Benjamin Horowitz, Khee-Gan Lee, Metin Ata, Thomas Mueller, Alex Krolewski, J. Xavier Prochaska, Joseph F. F. Hennawi, Martin White, David Schlegel, R. Michael Rich, Peter E. Nugent, Nao Suzuki, Daichi Kashino, Anton M. M. Koekemoer, Brian C. C. Lemaux
Summary: This study presents the second data release of the COSMOS Ly alpha Mapping And Tomography Observations Survey, which uses Lα absorption to study neutral hydrogen in the intergalactic medium. The reconstructed 3D maps reveal the detailed cosmic web consisting of voids, sheets, filaments, and nodes. The data is publicly available for further exploration and qualitative comparisons.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2022)
Article
Astronomy & Astrophysics
Joseph DeRose, Shi-Fan Chen, Nickolas Kokron, Martin White
Summary: Numerical simulations in cosmology require trade-offs between volume, resolution, and run-time, leading to sample variance in predictions of ensemble-average quantities. We extend the technique of Zel'dovich control variates to reduce the sample variance in measurements of 2-point statistics of biased tracers in redshift space. This allows improved predictions for the clustering of astronomical objects at very modest computational expense.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
J. Luna Zagorac, Isabel Sands, Nikhil Padmanabhan, Richard Easther
Summary: This study investigates the dynamical evolution of perturbations to the spherically symmetric soliton in self-gravitating quantum matter. The study finds that the eigenstates of the Schr??dinger equation qualitatively capture the properties seen in full ultralight dark matter (ULDM) simulations. Additionally, the study shows that the time evolution of the gravitational potential and its impact on the perturbations can be well-described using time-dependent perturbation theory.
