Article
Astronomy & Astrophysics
A. Mussatayeva, N. Myrzakulov, M. Koussour
Summary: In this paper, the authors investigate the parametrization of the effective equation of state (EoS) parameter within the framework of f(Q) symmetric teleparallel gravity. They derive the cosmological solution of the Hubble parameter H(z) using a specific parametrization and a power-law model of f(Q) theory. The model parameters are constrained using observational data, and the stability of the model is confirmed through a stability analysis.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Physics, Multidisciplinary
Jin-Wei Wang, Alessandro Granelli, Piero Ullio
Summary: We investigate the potential of relativistic protons in the jets of blazars to boost the surrounding dark matter particles to high energies through elastic collisions. By focusing on two sample blazars, namely TXS 0506 + 056 and BL Lacertae, we find that the induced dark matter flux at Earth could be significant and surpasses the flux associated with dark matter boosted by galactic cosmic rays. This becomes relevant for the direct detection of light dark matter particles with masses lighter than 1 GeV, as demonstrated by the null detection of a signal by XENON1T, MiniBooNE, and Borexino.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
U. Y. Divya Prasanthi, Y. Aditya
Summary: This paper discusses the cosmic evolution of the anisotropic and spatially homogeneous Kantowski-Sachs universe with Renyi holographic dark energy in the background of general relativity. The study includes calculations of cosmological aspects of dynamical parameters, such as the dark energy equation of state parameter, and explores the stability of the model, which is found to be stable at initial epoch but unstable at present and late times. The analysis also indicates that the model comprises quintessence, phantom dark energy regions, and the Lambda CDM limit.
PHYSICS OF THE DARK UNIVERSE
(2021)
Article
Astronomy & Astrophysics
L. Areste Salo, D. Benisty, E. Guendelman, J. D. Haro
Summary: A new type of quintessential inflation based on the Lorentzian distribution has been introduced, with a simple potential that aligns with recent observations and depicts the acceleration of the universe, including reheating constraints.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
A. Chen, D. Huterer, S. Lee, A. Ferte, N. Weaverdyck, O. Alves, C. D. Leonard, N. MacCrann, M. Raveri, A. Porredon, E. Di Valentino, J. Muir, P. Lemos, A. R. Liddle, J. Blazek, A. Campos, R. Cawthon, A. Choi, S. Dodelson, J. Elvin-Poole, D. Gruen, A. J. Ross, L. F. Secco, I Sevilla-Noarbe, E. Sheldon, M. A. Troxel, J. Zuntz, T. M. C. Abbott, M. Aguena, S. Allam, J. Annis, S. Avila, E. Bertin, S. Bhargava, S. L. Bridle, D. Brooks, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, M. Costanzi, M. Crocce, L. N. da Costa, M. E. S. Pereira, T. M. Davis, P. Doel, T. F. Eifler, I Ferrero, P. Fosalba, J. Frieman, J. Garcia-Bellido, E. Gaztanaga, D. W. Gerdes, R. A. Gruendl, J. Gschwend, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, B. Hoyle, D. J. James, M. Jarvis, K. Kuehn, O. Lahav, M. A. G. Maia, J. L. Marshall, F. Menanteau, R. Miquel, R. Morgan, A. Palmese, F. Paz-Chinchon, A. A. Plazas, A. Roodman, E. Sanchez, V Scarpine, M. Schubnell, S. Serrano, M. Smith, E. Suchyta, G. Tarle, D. Thomas, C. To, T. N. Varga, J. Weller, R. D. Wilkinson
Summary: The study investigates a phenomenological class of models where dark matter converts to dark radiation, and places new constraints on the amount of this conversion using a combination of observational data. Results show increased concordance between the DES and CMB+SN+BAO datasets for the DMDR model compared to the ΛCDM model, as well as slight reductions in S-8 and the Hubble tension. However, there is no preference for the DMDR cosmology over the ΛCDM based on maximum-posterior goodness-of-fit statistics.
Article
Astronomy & Astrophysics
Soichiro Hashiba, Kohei Fujikura, Jun'ichi Yokoyama
Summary: We propose a model that explains dark matter, baryon asymmetry, and reheating in a quintessential inflation model. The model introduces three generations of right-handed neutrinos with hierarchical masses and a light scalar field that leads to the self-interaction of active neutrinos. The lightest sterile neutrino is a dark matter candidate produced by a Dodelson-Widrow mechanism, while the two heaviest sterile neutrinos are responsible for generating the baryon asymmetry. Reheating is achieved through spinodal instabilities of the Standard Model Higgs field induced by nonminimal coupling to the scalar curvature, resolving the overproduction of gravitons and curvature perturbation caused by Higgs condensation.
Article
Astronomy & Astrophysics
J. Colin Hill, Erminia Calabrese, Simone Aiola, Nicholas Battaglia, Boris Bolliet, Steve K. Choi, Mark J. Devlin, Adriaan J. Duivenvoorden, Jo Dunkley, Simone Ferraro, Patricio A. Gallardo, Vera Gluscevic, Matthew Hasselfield, Matt Hilton, Adam D. Hincks, Renee Hlozek, Brian J. Koopman, Arthur Kosowsky, Adrien La Posta, Thibaut Louis, Mathew S. Madhavacheril, Jeff McMahon, Kavilan Moodley, Sigurd Naess, Umberto Natale, Federico Nati, Laura Newburgh, Michael D. Niemack, Lyman A. Page, Bruce Partridge, Frank J. Qu, Maria Salatino, Alessandro Schillaci, Neelima Sehgal, Blake D. Sherwin, Cristobal Sifon, David N. Spergel, Suzanne T. Staggs, Emilie R. Storer, Alexander van Engelen, Eve M. Vavagiakis, Edward J. Wollack, Zhilei Xu
Summary: The early dark energy scenario aims to increase the value of the Hubble constant inferred from cosmic microwave background data by introducing a new form of energy density in the early Universe. In this paper, the EDE model is fitted to CMB data from the ACT, and the existence of EDE is preferred at a high confidence level. This study suggests that future data from ACT and other ground-based experiments will provide a powerful test of the EDE scenario.
Article
Astronomy & Astrophysics
Adrien La Posta, Thibaut Louis, Xavier Garrido, J. Colin Hill
Summary: This study uses the latest data from the South Pole Telescope (SPT-3G) to constrain the parameters of Early Dark Energy (EDE). The results suggest that, at the current precision level, the contribution of EDE to the total energy density of the universe prior to recombination cannot be ruled out, but the data are also consistent with no EDE. The combination of ACT DR4 and SPT-3G with the Planck large-scale temperature anisotropy measurement shows a hint of nonzero EDE, but this preference disappears when the full Planck 2018 dataset is included.
Article
Astronomy & Astrophysics
Ke Wang, Lu Chen
Summary: Research suggests that dark energy (DE) may be composed of multiple components, with constraints needed on the equation of state of different components when constructing multi-component DE models. Observational data favors multi-component DE models with small n, with the w2CDM model slightly preferred over the CPL model.
Article
Physics, Mathematical
Gopal Sardar, Subenoy Chakraborty
Summary: This paper considers two modified CPL models in the FLRW spacetime model with homogeneous and isotropic background. From the analysis of observational data (Pantheon + BAO + HST), it is found that the logarithmic form of the equation of state for dark energy (model II) is preferred with tighter constraints compared to the other form (model I) using AIC and BIC. However, in the context of Bayesian evidence, model I is favored over model II. Finally, it is concluded that model I is more preferable than model II for the H0 tension.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2023)
Article
Astronomy & Astrophysics
T. Harko, K. Asadi, H. Moshafi, H. Sheikhahmadi
Summary: This study investigates the effects of interaction, decay, and particle generation in a many-component Universe using an approach based on open system thermodynamics. By introducing particle number balance equations and creation pressures, the cosmological evolution equations are thermodynamically consistent. Constrained by multiple observational data sets, this model provides a solution to the Hubble tension problem.
PHYSICS OF THE DARK UNIVERSE
(2022)
Article
Astronomy & Astrophysics
Peter B. Denton, Julia Gehrlein
Summary: This article mainly introduces the degeneracies in neutrino oscillation physics, known as LMA-Dark, which make it impossible to determine the atmospheric mass ordering using oscillation experiments alone. By combining different measurements, the degeneracies can be lifted to some extent. New data from the Dresden-II experiment are used to completely remove the degeneracies in the ν(e) sector at the MeV scale. However, the LMA-Dark degeneracy can still be restored in the ν(μ) and ν(τ) sectors.
Article
Computer Science, Interdisciplinary Applications
Huanming Zhang, Ruiqi Ma, Lianbiao Cui, Gang Tian, Zhaojun Ma
Summary: China's urbanization process has been affected by energy and environmental constraints, leading to a slowdown in economic growth. This study explores the relationship between energy consumption, environmental pollution, and urbanization by extending the classical Solow growth model. The results show that the direct and indirect growth drag effects of urbanization under the dual constraints of energy and the environment are 0.288% and 0.122% respectively. Energy consumption restrictions not only affect the local urbanization development but also neighboring provinces. Furthermore, the spatial distribution characteristics of the urbanization growth drag effect in China have evolved dynamically over time.
COMPUTERS & INDUSTRIAL ENGINEERING
(2022)
Article
Astronomy & Astrophysics
Avirup Ghosh, Sourav Gope, Satyanarayan Mukhopadhyay
Summary: This article discusses the self-interaction processes of internally thermalized dark matter in the early universe. The study finds that when dark matter is nonrelativistic, its self-interaction leads to slower cooling compared to standard nonrelativistic matter, and there are strong constraints from structure formation during the matter-dominated epoch. However, if the cannibal phase freezes out in the radiation-dominated epoch, the self-interaction of cannibal dark matter can be viable and consistent with cosmological constraints.
Article
Astronomy & Astrophysics
Nilanjan Banik, Jo Bovy, Gianfranco Bertone, Denis Erkale, T. J. L. de Boer
Summary: This paper provides constraints on alternative dark matter scenarios based on tidal streams analysis, deriving lower limits for warm dark matter and ultra-light dark matter masses using data from streams and dwarf satellite counts.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)