Article
Astronomy & Astrophysics
Vicente Delgado, Antonio Munoz Mateo
Summary: This study assumes dark matter to be a cosmological self-gravitating Bose-Einstein condensate comprised of non-relativistic ultralight scalar particles with competing gravitational and repulsive contact interactions. It explores the observational implications of this model and finds that dark matter structures can form stable self-bound structures exhibiting a universal mass profile and rotation curve.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
G. Bonnet, E. Nezri, K. Kraljic, C. Schimd
Summary: The morphology of haloes provides valuable information for understanding cosmological and galaxy formation models. Minkowski Functionals (MFs) are used to characterize the actual morphology of haloes, which go beyond traditional spherical or ellipsoidal symmetries and can capture the internal structures and external shape parameters of haloes more accurately.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Tonatiuh Matos
Summary: The scalar field dark matter (SFDM) model has received attention for its ability to provide simpler and more natural explanations. Recent research shows that SFDM can explain the polar orbits of satellite galaxies and the emissions in the vacuum regions of our galaxy. The quantum character of SFDM plays a crucial role in these phenomena, even at the cosmological level.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Camila A. Correa, Matthieu Schaller, Sylvia Ploeckinger, Noemi Anau Montel, Christoph Weniger, Shin'ichiro Ando
Summary: We introduce the TangoSIDM project, a suite of cosmological simulations that explore the impact of large dark matter scattering cross-sections over dwarf galaxy scales. The simulations accurately model core formation and gravothermal core collapse, showing that the velocity-dependent cross-sections produce a large diversity in the circular velocities of satellite haloes. This research offers a promising explanation for the diversity in density and velocity profiles observed in dwarf galaxies.
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
I-Kang Liu, Nick P. Proukakis, Gerasimos Rigopoulos
Summary: We find that fuzzy dark matter haloes exhibit spatial differentiation in coherence, with complete coherence in the central solitonic core and incoherence outside of it. The phase-space density decreases significantly as the radius increases. The core is a pure condensate, overlapping perfectly with the largest eigenvalue of the one-particle density matrix. The outer halo consists of local, short-lived quasi-condensate lumps called granules, separated by vortices that form a dynamic web, inhibiting phase coherence throughout the entire halo.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ellen L. Sirks, Kyle A. Oman, Andrew Robertson, Richard Massey, Carlos Frenk
Summary: In this study, the Cluster-EAGLE (C-EAGLE) hydrodynamical simulations were used to investigate the effects of self-interacting dark matter (SIDM) on galaxies as they fall into clusters. The results showed that SIDM galaxies follow similar orbits to their cold dark matter (CDM) counterparts but end up with about 25% less mass by the present day. Additionally, one in three SIDM galaxies were entirely disrupted compared to one in five CDM galaxies. However, the excess stripping of SIDM galaxies would be harder to observe due to the formation of cores and the loss of stars.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Xuejian Shen, Philip F. Hopkins, Lina Necib, Fangzhou Jiang, Michael Boylan-Kolchin, Andrew Wetzel
Summary: The study investigates the effects of dissipative self-interacting dark matter in cosmological simulations, exploring the parameter space. Low-mass dwarf galaxies exhibit cuspy dark matter density profiles with a power-law slope of approximately -1.5. Models with higher cross-sections show dark matter rotation and halo deformation, but do not result in baryon-like thin 'dark discs'.
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
Camila A. Correa
Summary: The study investigates the potential signature of self-interacting dark matter (SIDM) based on the observed anticorrelation between central dark matter (DM) densities of bright Milky Way dwarf spheroidal galaxies (dSphs) and their orbital pericentre distances. By analyzing the range of SIDM scattering cross-section per unit mass, the research finds that different dSph models require varying values of sigma/m(chi) to reproduce the observed central DM densities. Larger cross-sections are correlated with lower collision velocities of DM particles within each subhalo's core, leading to a proposed SIDM particle model involving a DM particle with a mass m(chi) = 53.93 +/- 9.81 GeV interacting through a light mediator of mass m(phi) = 6.6 +/- 0.43 MeV. This cross-section-velocity relation explains the diverse DM profiles of MW dSph satellites and matches observational constraints on larger scales.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Andrew Robertson, Richard Massey, Vincent Eke, Joop Schaye, Tom Theuns
Summary: The study utilizes an isothermal Jeans model to predict SIDM density profiles and tests it against cosmological simulations, finding that the model provides an accurate description of simulated SIDM density profiles as the Navarro-Frenk-White profile does of CDM haloes. The model works effectively across the entire halo mass range studied, with the tightest constraints expected to come from dwarf galaxies and galaxy clusters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Andrew Robertson, Richard Massey, Vincent Eke, Joop Schaye, Tom Theuns
Summary: Recent research has investigated a method for predicting the density profiles of galaxies and galaxy clusters containing self-interacting dark matter, and tested its accuracy using cosmological simulations. The isothermal Jeans model was found to provide an accurate description of simulated SIDM density profiles across a wide range of halo masses.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Hsinhao Huang, Hsi-Yu Schive, Tzihong Chiueh
Summary: In this study, the wave (fuzzy) dark matter (psi DM) is extended to two components and their soliton-halo structure is investigated through cosmological simulations. The results show that when the proportion of the two components is 75% and 25%, both the major and minor component solitons coexist and have similar masses. However, when the proportion is 25% and 75%, a minor-component soliton cannot form. This work demonstrates the advantages of the multi-component psi DM model over the single-component model.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Hei Yin Jowett Chan, Elisa G. M. Ferreira, Simon May, Kohei Hayashi, Masashi Chiba
Summary: In the fuzzy dark matter model, there is a significant dispersion in the core-halo mass relation, increasing with halo mass. A new empirical equation for the core-halo mass relation is provided, with uncertainties encompassing previously found relations. Any observational constraints on particle mass using a tight one-to-one core-halo mass relation should consider an additional uncertainty of about 50%.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Fangzhou Jiang, Andrew Benson, Philip F. Hopkins, Oren Slone, Mariangela Lisanti, Manoj Kaplinghat, Annika H. G. Peter, Zhichao Carton Zeng, Xiaolong Du, Shengqi Yang, Xuejian Shen
Summary: We have developed a semi-analytic procedure that combines the isothermal Jeans model and the model of adiabatic halo contraction to compute the density profile of self-interacting dark matter (SIDM) haloes influenced by the presence of galaxies. This model agrees well with cosmological SIDM simulations and provides insights into the diverse halo response to baryonic effects in SIDM.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Zachary Slepian, Daniel J. Eisenstein, Jonathan A. Blazek, Joel R. Brownstein, Chia-Hsun Chuang, Hector Gil-Marin, Shirley Ho, Francisco-Shu Kitaura, Joseph E. McEwen, Will J. Percival, Ashley J. Ross, Graziano Rossi, Hee-Jong Seo, Anze Slosar, Mariana Vargas-Magana
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
Zachary Slepian, Stephen K. N. Portillo
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
Zachary Slepian, Daniel J. Eisenstein
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
Sankalp Gilda, Zachary Slepian
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Astronomy & Astrophysics
Zachary Slepian
Summary: This paper presents a new method to tackle the issue of high-dimensional integrals in perturbation theory, making the computation of higher order corrections more efficient and feasible. The method transforms the calculation of corrections into combinations of independent 1D integrals, and simplifies the integration process using specific techniques.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Andrew K. Saydjari, Stephen K. N. Portillo, Zachary Slepian, Sule Kahraman, Blakesley Burkhart, Douglas P. Finkbeiner
Summary: This paper demonstrates the sensitivity of wavelet scattering transform (WST) combined with linear discriminant analysis (LDA) to non-Gaussian structures in 2D interstellar medium dust maps. The WST-LDA method shows a high true positive rate in classifying magnetohydrodynamic (MHD) turbulence simulations and is robust to observational artifacts. Further applications in 3D and potential use on all-sky dust maps for extracting hydrodynamic parameters are discussed.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Oliver H. E. Philcox, Zachary Slepian, Jiamin Hou, Craig Warner, Robert N. Cahn, Daniel J. Eisenstein
Summary: The new algorithm efficiently computes N-point correlation functions of a 3D density field for arbitrary N, applicable to both discrete spectroscopic galaxy surveys and continuous fields. By estimating NPCFs through counting pairs of particles in space, the algorithm has low complexity for N-g particles and scales linearly.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Multidisciplinary Sciences
Oliver H. E. Philcox, Zachary Slepian
Summary: Efficient algorithms for computing the N-point correlation functions (NPCFs) of random fields in arbitrary D-dimensional homogeneous and isotropic spaces are presented. The estimators are expressed in a separable form by projecting the statistic onto a suitably defined angular basis, resulting in lower computational complexity. A Julia package implementing these estimators is provided, along with applications in cosmology and fluid dynamics.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Physics, Multidisciplinary
Robert N. Cahn, Zachary Slepian, Jiamin Hou
Summary: We describe how the galaxy four-point correlation function can be used to test for cosmological parity violation, which would indicate unknown forces in the early universe. Recent advancements in evaluating galaxy N-point correlation functions and determining the corresponding covariance matrices enable the search for parity violation in the four-point correlation function in ongoing and upcoming surveys. We estimate the potential limits on cosmic parity violation that can be achieved using these data.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
Oliver H. E. Philcox, Zachary Slepian
Summary: This study proposes practical algorithms for computing the power spectrum and 2PCF multipoles using pairwise lines of sight, adopting the galaxy midpoint or angle bisector definitions. The accuracy of these estimators can reach arbitrary order, producing comparable results to conventional methods with only modest additional computational cost in practice.
Article
Astronomy & Astrophysics
B. Burkhart, S. M. Appel, S. Bialy, J. Cho, A. J. Christensen, D. Collins, C. Federrath, D. B. Fielding, D. Finkbeiner, A. S. Hill, J. C. Ibanez-Mejia, M. R. Krumholz, A. Lazarian, M. Li, P. Mocz, M. -M. Mac Low, J. Naiman, S. K. N. Portillo, B. Shane, Z. Slepian, Y. Yuan
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
Arjun Dey, David J. Schlegel, Dustin Lang, Robert Blum, Kaylan Burleigh, Xiaohui Fan, Joseph R. Findlay, Doug Finkbeiner, David Herrera, Stephanie Juneau, Martin Landriau, Michael Levi, Ian McGreer, Aaron Meisner, Adam D. Myers, John Moustakas, Peter Nugent, Anna Patej, Edward F. Schlafly, Alistair R. Walker, Francisco Valdes, Benjamin A. Weaver, Christophe Yeche, Hu Zou, Xu Zhou, Behzad Abareshi, T. M. C. Abbott, Bela Abolfathi, C. Aguilera, Shadab Alam, Lori Allen, A. Alvarez, James Annis, Behzad Ansarinejad, Marie Aubert, Jacqueline Beechert, Eric F. Bell, Segev Y. BenZvi, Florian Beutler, Richard M. Bielby, Adam S. Bolton, Cesar Briceno, Elizabeth J. Buckley-Geer, Karen Butler, Annalisa Calamida, Raymond G. Carlberg, Paul Carter, Ricard Casas, Francisco J. Castander, Yumi Choi, Johan Comparat, Elena Cukanovaite, Timothee Delubac, Kaitlin DeVries, Sharmila Dey, Govinda Dhungana, Mark Dickinson, Zhejie Ding, John B. Donaldson, Yutong Duan, Christopher J. Duckworth, Sarah Eftekharzadeh, Daniel J. Eisenstein, Thomas Etourneau, Parker A. Fagrelius, Jay Farihi, Mike Fitzpatrick, Andreu Font-Ribera, Leah Fulmer, Boris T. Gansicke, Enrique Gaztanaga, Koshy George, David W. Gerdes, Satya Gontcho A. Gontcho, Claudio Gorgoni, Gregory Green, Julien Guy, Diane Harmer, M. Hernandez, Klaus Honscheid, Lijuan (Wendy) Huang, David J. James, Buell T. Jannuzi, Linhua Jiang, Richard Joyce, Armin Karcher, Sonia Karkar, Robert Kehoe, Jean-Paul Kneib, Andrea Kueter-Young, Ting-Wen Lan, Tod R. Lauer, Laurent Le Guillou, Auguste Le Van Suu, Jae Hyeon Lee, Michael Lesser, Laurence Perreault Levasseur, Ting S. Li, Justin L. Mann, Robert Marshall, C. E. Martinez-Vazquez, Paul Martini, Helion du Mas des Bourboux, Sean McManus, Tobias Gabriel Meier, Brice Menard, Nigel Metcalfe, Andrea Munoz-Gutierrez, Joan Najita, Kevin Napier, Gautham Narayan, Jeffrey A. Newman, Jundan Nie, Brian Nord, Dara J. Norman, Knut A. G. Olsen, Anthony Paat, Nathalie Palanque-Delabrouille, Xiyan Peng, Claire L. Poppett, Megan R. Poremba, Abhishek Prakash, David Rabinowitz, Anand Raichoor, Mehdi Rezaie, A. N. Robertson, Natalie A. Roe, Ashley J. Ross, Nicholas P. Ross, Gregory Rudnick, Sasha Safonova, Abhijit Saha, F. Javier Sanchez, Elodie Savary, Heidi Schweiker, Adam Scott, Hee-Jong Seo, Huanyuan Shan, David R. Silva, Zachary Slepian, Christian Soto, David Sprayberry, Ryan Staten, Coley M. Stillman, Robert J. Stupak, David L. Summers, Suk Sien Tie, H. Tirado, Mariana Vargas-Magana, A. Katherina Vivas, Risa H. Wechsler, Doug Williams, Jinyi Yang, Qian Yang, Tolga Yapici, Dennis Zaritsky, A. Zenteno, Kai Zhang, Tianmeng Zhang, Rongpu Zhou, Zhimin Zhou
ASTRONOMICAL JOURNAL
(2019)
Article
Astronomy & Astrophysics
Hillary L. Child, Masahiro Takada, Takahiro Nishimichi, Tomomi Sunayama, Zachary Slepian, Salman Habib, Katrin Heitmann
Article
Astronomy & Astrophysics
Nick Hand, Yu Feng, Florian Beutler, Yin Li, Chirag Modi, Uros Seljak, Zachary Slepian
ASTRONOMICAL JOURNAL
(2018)
Article
Astronomy & Astrophysics
Stephen K. N. Portillo, Zachary Slepian, Blakesley Burkhart, Sule Kahraman, Douglas P. Finkbeiner
ASTROPHYSICAL JOURNAL
(2018)