Article
Astronomy & Astrophysics
S. Capozziello, S. Zare, D. F. Mota, H. Hassanabadi
Summary: In this study, the effects of a dark matter spike near the supermassive black hole in M87 (Virgo A galaxy) were investigated using the Bumblebee Gravity theory. The aim was to determine the impact of spontaneous Lorentz symmetry breaking on the horizon, ergo-region, and shadow of the Kerr Bumblebee black hole in the spike region. Dark matter distribution was incorporated into a Lorentz-violating spherically symmetric space-time, and the resulting solution was generalized to a Kerr Bumblebee black hole. The shapes of the shadow were examined based on observational data for the dark matter spike density and radius.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Physics, Multidisciplinary
Alexander V. Gramolin, Deniz Aybas, Dorian Johnson, Janos Adam, Alexander O. Sushkov
Summary: The study presents results of a direct search for electromagnetic interactions of ultralight axion-like dark matter in a mass range from 12 peV to 12 neV. The experiment used a detection scheme based on the modification of Maxwell's equations in the presence of axion-like dark matter. Researchers achieved improved limits on the magnitude of the electromagnetic coupling constant for axion-like dark matter over a part of the mass range studied.
Article
Astronomy & Astrophysics
Zahra Davari, Sohrab Rahvar
Summary: By comparing the MOG theory and the ΛCDM cosmology, the study explored their differences in background cosmological properties and structure formation, showing that the MOG model is consistent with the ΛCDM model in statistical analysis.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Anirudh Gundhi, Sergei Ketov, Christian F. Steinwachs
Summary: The study investigates the production of primordial black holes in a dilaton two-field extension of Starobinsky's quadratic f(R) model, which features a multi-field amplification mechanism leading to a sharp peak in the inflationary power spectrum at small wavelengths. This mechanism is significantly different from single-field models and successfully explains the observed cold dark matter content in the Universe through the formation of primordial black holes.
Article
Astronomy & Astrophysics
Yun Liu, Shihong Liao, Xiangkun Liu, Jiajun Zhang, Rui An, Zuhui Fan
Summary: The interacting dark energy (IDE) model provides a natural mechanism to address the coincidence problem and relieve observational tensions under the ΛCDM model. However, current observational data are insufficient to effectively distinguish IDE models from ΛCDM, and additional information from non-linear structure formation is needed. For the model with dark matter decaying into dark energy, the structure formation is slowed down and the properties of dark matter haloes are inconsistent with observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Fulvio Ferlito, Sunny Vagnozzi, David F. Mota, Marco Baldi
Summary: In this study, we investigate the non-linear effects of scattering between dark energy and baryons on the formation of cosmic structures. Using large N-body simulations, we find that the signatures of this scattering in the non-linear regime are significantly larger than in the linear regime, and could potentially be constrained through a combination of observables.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Joshua W. Foster, Yonatan Kahn, Rachel Nguyen, Nicholas L. Rodd, Benjamin R. Safdi
Summary: The next generation of ultralight dark matter direct detection experiments will utilize multiple detectors operating at different terrestrial locations to confirm sub-eV bosons as the dominant source of DM. By combining data from multiple detectors, directional information about the DM phase space distribution can be constrained. Additionally, it is shown that the signal in multiple detectors exhibits a daily modulation effect unique to wavelike DM.
Article
Astronomy & Astrophysics
Takuya Tsutsui, Atsushi Nishizawa
Summary: This study investigates the impact of axions, a candidate for dark matter, on gravitational waves and derives constraints on the coupling between axions and the parity-violating sector of gravity.
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
Physics, Particles & Fields
Areef Waeming, Tanech Klangburam, Chakrit Pongkitivanichkul, Daris Samart
Summary: In this study, we investigate the Brans-Dicke model inspired by Kaluza-Klein theory and introduce additional scalar and gauge fields. The inclusion of barotropic matter in the compactification process leads to the determination of critical points that indicate the presence of dark matter, dark energy, and phantom dark energy.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
J. A. Aguilar-Saavedra, D. E. Lopez-Fogliani, C. Munoz, M. Pierre
Summary: The study introduces the U mu nu SSM model as an extension of the mu nu SSM supersymmetric model, where violating baryon-number operators and explicit mass terms are prohibited. The research also analyzes the relic density of the dark matter candidate by calculating through Z', Higgs-right sneutrino, and dark matter mediated annihilations, as well as assessing potential signals in dark matter direct detection experiments.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Zeinab Rezaei
Summary: In this study, we calculate the structure of relativistic stars with fuzzy dark matter (FDM) using the FDM equation of state and constrained by observational data. We incorporate observational data for visible matter equation of state in neutron stars, quark stars, and hybrid stars. The structure of FDM admixed relativistic stars is studied using the two-fluid formalism.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
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
Yann Mambrini, Keith A. Olive, Jiaming Zheng
Summary: Dark matter may only interact with the visible sector at high energy scales. During the period of reheating, the dominant process of dark matter production is through the decay products of the inflaton. This process dominates for low reheating temperatures and can produce the required density of dark matter.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Logan Morrison, Stefano Profumo, Dean J. Robinson
Summary: The study discusses a dark QCD sector as a minimal extension of the Standard Model, which includes Dark Matter candidates without the need for additional interactions with the visible sector. Under specific conditions, this dark sector can generate Dark Matter candidates.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)