Article
Astronomy & Astrophysics
Ginevra Favole, Benjamin R. Granett, Javier Silva Lafaurie, Domenico Sapone
Summary: The study investigates the jackknife method for internal covariance estimation in large-scale structure surveys, exploring the impact of jackknife size and number of resamplings on the precision of the covariance estimate and errors in cosmological parameters. Results show that the baryon acoustic scale error estimate is independent of the jackknife scale, while the shift parameter a exhibits variations in error estimates from different datasets.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Mihir Kulkarni, Jeremiah P. Ostriker
Summary: Fuzzy dark matter, composed of ultra-light axions, is an alternative theory designed to address the small-scale problems faced by the standard cold dark matter proposal. It alleviates some of the apparent discrepancies faced by the standard ACDM paradigm.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Han Aung, Daisuke Nagai, Eduardo Rozo, Brandon Wolfe, Susmita Adhikari
Summary: We present a highly accurate model of the velocity distribution of galaxies around dark matter haloes based on projected radius and halo mass. This model distinguishes between different types of galaxies and accurately recovers their velocity dispersion profiles. The model's redundancies allow for non-trivial systematics checks from a single data set. This model has potential applications in detecting edge radius and constraining cosmology and astrophysics using upcoming spectroscopic surveys.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Theo Simon, Guillermo Abellan, Peizhi Franco Du, Vivian Poulin, Yuhsin Tsai
Summary: In this study, we updated the cosmological constraints on two decaying dark matter models using BOSS-DR12 data and the EFTofLSS framework. The results showed that Planck data contributed the most to these constraints, and EFTofBOSS data significantly improved the constraints on the lifetime of decayed dark matter. Furthermore, we found that adjusting S-8 to match KiDS-1000 required a longer lifetime and a larger kick velocity.
Article
Astronomy & Astrophysics
Daria Zakharova, Benedetta Vulcani, Gabriella De Lucia, Lizhi Xie, Michaela Hirschmann, Fabio Fontanot
Summary: This study investigates the properties of filaments and compares the methods of extracting filaments using dark matter distribution and model galaxy distribution. The results show that filaments extracted using different tracers are generally consistent but never coincide completely. Additionally, the number of filaments identified using galaxy distribution in massive clusters is typically underestimated.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Richard Watkins, Trey Allen, Collin James Bradford, Albert Ramon Jr, Alexandra Walker, Hume A. Feldman, Rachel Cionitti, Yara Al-Shorman, Ehsan Kourkchi, R. Brent Tully
Summary: We estimated the bulk flow in a volume of radii 150-200 h(-1) Mpc using the minimum variance method with data from the CosmicFlows-4 (CF4) catalogue. The addition of new data in the CF4 increased the estimate of the bulk flow in a sphere of radius 150 h(-1) Mpc compared to the CosmicFlows-3 (CF3). The bulk flow in CF4 has a low probability of occurring in the standard cosmological model, and on scales of 200 h(-1) Mpc, it is in even greater tension with the standard model.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Marco Hufnagel, Xun-Jie Xu
Summary: In the presence of interactions between neutrinos and dark matter, this study investigates the implications for the evolution of both dark matter and neutrinos in the early Universe. It shows that the future cosmic neutrino detection experiment PTOLEMY might be sensitive to neutrino signals that originate from dark matter annihilation in this model.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
S. Samuroff, R. Mandelbaum, J. Blazek, A. Campos, N. MacCrann, G. Zacharegkas, A. Amon, J. Prat, S. Singh, J. Elvin-Poole, A. J. Ross, A. Alarcon, E. Baxter, K. Bechtol, M. R. Becker, G. M. Bernstein, A. Carnero Rosell, M. Carrasco Kind, R. Cawthon, C. Chang, R. Chen, A. Choi, M. Crocce, C. Davis, J. DeRose, S. Dodelson, C. Doux, A. Drlica-Wagner, K. Eckert, S. Everett, A. Ferte, M. Gatti, G. Giannini, D. Gruen, R. A. Gruendl, I Harrison, K. Herner, E. M. Huff, M. Jarvis, N. Kuropatkin, P-F Leget, P. Lemos, J. McCullough, J. Myles, A. Navarro-Alsina, S. Pandey, A. Porredon, M. Raveri, M. Rodriguez-Monroy, R. P. Rollins, A. Roodman, G. Rossi, E. S. Rykoff, C. Sanchez, L. F. Secco, I Sevilla-Noarbe, E. Sheldon, T. Shin, M. A. Troxel, I Tutusaus, N. Weaverdyck, B. Yanny, B. Yin, Y. Zhang, J. Zuntz, M. Aguena, O. Alves, J. Annis, D. Bacon, E. Bertin, S. Bocquet, D. Brooks, D. L. Burke, J. Carretero, M. Costanzi, L. N. da Costa, M. E. S. Pereira, J. De Vicente, S. Desai, H. T. Diehl, J. P. Dietrich, P. Doel, I Ferrero, B. Flaugher, J. Frieman, J. Garcia-Bellido, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. J. James, K. Kuehn, O. Lahav, J. L. Marshall, P. Melchior, J. Mena-Fernandez, F. Menanteau, R. Miquel, J. Newman, A. Palmese, A. Pieres, A. A. Plazas Malagon, E. Sanchez, V Scarpine, M. Smith, E. Suchyta, M. E. C. Swanson, G. Tarle, C. To
Summary: We directly constrain galaxy intrinsic alignments (IAs) using data from Dark Energy Survey Year 3 (DES Y3), Extended Baryon Oscillation Spectroscopic Survey (eBOSS), and Baryon Oscillation Spectroscopic Survey (BOSS). Our measurements incorporate different types of galaxies at various redshifts and fit a model that includes lensing, magnification, and photometric redshift error. We detect IAs in each sample and observe a detectable dependence on color between broadly defined red samples. It is likely that future measurements will require a more sophisticated approach to account for the effects of color and luminosity on the IA signal.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Elena Asencio, Indranil Banik, Steffen Mieske, Aku Venhola, Pavel Kroupa, Hongsheng Zhao
Summary: Due to their low surface brightness, dwarf galaxies are vulnerable to tidal forces. This study compares the properties of dwarf galaxies in the Fornax Cluster with the Lambda Cold Dark Matter (Lambda CDM) cosmological model and Milgromian dynamics (MOND). The results show that MOND is more consistent with the observed deformations and the lack of low surface brightness dwarfs in the Fornax Cluster than the Lambda CDM model.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Amber M. Hollinger, Michael J. Hudson
Summary: A promising method for measuring the cosmological parameter combination f(8)(sigma) is to compare observed peculiar velocities with predicted velocities using perturbation theory. Despite small systematic biases, the method is accurate and precise, with cosmic variance affecting current measurements due to the volume of redshift data sets.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Stephanie O'Neil, Mark Vogelsberger, Saniya Heeba, Katelin Schutz, Jonah C. Rose, Paul Torrey, Josh Borrow, Ryan Low, Rakshak Adhikari, Mikhail Medvedev, Tracy R. Slatyer, Jesus Zavala
Summary: Self-interacting dark matter (SIDM) can alleviate discrepancies between simulated cold dark matter (CDM) and observed galactic properties. We propose a physically motivated SIDM model with a nearly degenerate excited state that allows for both elastic and inelastic scattering. Our simulations show that up-scattering reactions increase the central densities of the main halo, but coring still occurs due to elastic and down-scattering effects.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Matteo Martinelli, Roohi Dalal, Fereshteh Majidi, Yashar Akrami, Stefano Camera, Elena Sellentin
Summary: Upcoming galaxy surveys will improve sensitivity and coverage of the cosmic large-scale structure, but standard approximations break down at these scales, creating issues for parameter estimation. This study quantifies the bias and proposes a debiasing method for obtaining accurate cosmological parameters from ultralarge-scale observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
P. Cataldi, S. E. Pedrosa, P. B. Tissera, M. C. Artale, N. D. Padilla, R. Dominguez-Tenreiro, L. Bignone, R. Gonzalez, L. J. Pellizza
Summary: In this study, we investigate the evolution of the morphology of Milky Way mass-like dark matter haloes selected from the cielo and IllustrisTNG projects. We focus on the halo shapes and their relation with the infalling material across cosmic time using hydrodynamical simulations. Our findings show that haloes tend to be more triaxial at earlier times due to stronger accretion in the direction of the filaments, but become more spherical as they evolve towards a dominant isotropic accretion mode and relaxation. Baryons have a significant effect on the shapes of the haloes, driving them from triaxial to rounder shapes within the inner regions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Andrea Maccio, Daniel Huterer Prats, Keri L. Dixon, Tobias Buck, Stefan Waterval, Nikhil Arora, Stephane Courteau, Xi Kang
Summary: Through simulations, it has been shown that dwarf galaxies can lose up to 80% of their dark matter content and see a significant change in the dark matter-to-stellar mass ratio after interactions with central galaxies. These findings align with observations of NGC 1052-DF2 and NGC 1054-DF4.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Alfonso Veropalumbo, Inigo Saez Casares, Enzo Branchini, Benjamin R. Granett, Luigi Guzzo, Federico Marulli, Michele Moresco, Lauro Moscardini, Andrea Pezzotta, Sylvain de la Torre
Summary: In this study, the galaxy two- and three-point correlation functions at specific redshifts were measured and analyzed using a joint likelihood analysis approach. Through the use of highly realistic VIPERS mock catalogs, the process and non-linear corrections were validated, demonstrating robustness down to small scales. The combination of two statistics successfully breaks the degeneracy between clustering amplitude, linear bias, and linear growth rate, providing measurements in excellent agreement with a Planck cosmology.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Anatoly Klypin, Francisco Prada, Juan Betancort-Rijo, Franco D. Albareti
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
Alexander Gallego Cadavid, Antonio Enea Romano
Article
Astronomy & Astrophysics
Atsushi Naruko, Antonio Enea Romano, Misao Sasaki, Sergio Andres Vallejo-Pena
CLASSICAL AND QUANTUM GRAVITY
(2020)
Article
Astronomy & Astrophysics
Sergio Andres Vallejo-Pena, Antonio Enea Romano
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
Hsu-Wen Chiang, Antonio Enea Romano, Fabien Nugier, Pisin Chen
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
Sergio Andres Vallejo-Pena, Antonio Enea Romano
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
A. Ferragamo, J. A. Rubino-Martin, J. Betancort-Rijo, E. Munari, B. Sartoris, R. Barrena
ASTRONOMY & ASTROPHYSICS
(2020)
Article
Astronomy & Astrophysics
Camilo Santa Velez, Antonio Enea Romano
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
Sergio Andres Vallejo-Pena, Antonio Enea Romano
Summary: The study reveals that modifications in gravity can influence the formation of primordial black holes, which is related to the spectrum of R, highlighting the importance of considering these effects on the abundance of PBHs.
Article
Astronomy & Astrophysics
Cristhian Garcia, Camilo Santa, Antonio Enea Romano
Summary: This article introduces the use of convolutional neural networks to solve the inversion problem of the large-scale structure of the Universe. By observing the luminosity distance of Supernovae Ia, the researchers can reconstruct the large-scale structure. The results show that the velocity field inversion is more accurate than the density field.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Physics, Multidisciplinary
Antonio Enea Romano, Mairi Sakellariadou
Summary: By using the conformal invariance of gravitational waves, it is demonstrated that in luminal modified gravity theories, the propagation and luminosity distance of gravitational waves are the same as those in general relativity. However, the relation between the luminosity distance of gravitational waves and electromagnetic waves is modified for electromagnetism minimally coupled to the Jordan frame metric. The analysis is extended to theories with nonluminal speed of gravitational waves and matter minimally coupled to either the Jordan or Einstein frame metrics using effective field theory.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
Alexander Gallego Cadavid, Antonio Enea Romano, Andrew R. Liddle
Summary: Purely geometrical arguments demonstrate the existence of homospectral inflationary cosmologies, which are different expansion histories resulting in the same spectrum of comoving curvature perturbations. A general algorithm is developed to reconstruct the potential of minimally coupled single scalar fields from arbitrary expansion histories. The infinite class of homospectral potentials depends on two free parameters, the initial energy scale and the initial value of the field. However, it is generally impossible to reconstruct a unique potential from the curvature spectrum unless the initial energy scale and field value are fixed.
Article
Physics, Particles & Fields
Brayan Yamid Del Valle Mazo, Antonio Enea Romano, Maryi Alejandra Carvajal Quintero
Summary: This article discusses the discrepancy between the large-scale and small-scale values of the Hubble parameter H-0, and how to calibrate supernovae observations using the absolute magnitude. The study finds that different values of the absolute magnitude can strongly affect the evidence of local inhomogeneity.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Juan Pablo Marulanda, Camilo Santa, Antonio Enea Romano
Article
Astronomy & Astrophysics
John Ellis, Malcolm Fairbaim, Antonio Enea Romano, Oscar Zapata