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
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
Physics, Particles & Fields
Swagat S. Mishra, Varun Sahni
Summary: Non-canonical scalar fields with specific Lagrangian properties have the capability to exhibit dark matter-like behavior on small scales. By manipulating the potential term, the kinetic term can be utilized as dark matter while the potential term plays the role of dark energy later on. Simple potentials like V = V-0 coth(2) phi and Starobinsky-type potentials can unify dark matter and dark energy, and cascading dark energy models are also effective in this unification.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
Yu-Dai Tsai, Robert McGehee, Hitoshi Murayama
Summary: This paper presents new models based on QCD-like dark sectors to solve small-scale structure problems. By drawing analogies to the meson spectra in standard model QCD, the models introduce resonant self-interacting dark matter and discuss experimental probes for both setups. The paper also comments on the resonant self-interactions already built into SIMP and ELDER mechanisms.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
Emil Brinch Holm, Thomas Tram, Steen Hannestad
Summary: Decaying dark matter models can impact the predicted value of the Hubble constant and bridge the discrepancies between CMB inferences and local measurements. In this study, a reevaluation of the warm dark matter decaying model is performed, including the mass of the decaying species, and its ability to alleviate tensions in Hubble and sigma(8) is assessed. The model shows mild improvements but further research is required to fully evaluate its effectiveness.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(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
Astronomy & Astrophysics
Philip Bull, Martin White, Anze Slosar
Summary: This study investigates constraints on the behavior of dynamical dark energy in the matter-dominated era, finding that existing CMB and LSS measurements have constrained the dark energy equation of state during this period. It also examines how forthcoming galaxy surveys and 21cm intensity mapping instruments can further improve constraints in this regime.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Wenyu Wang, Wu-Long Xu, Bin Zhu
Summary: This study investigates the influence of the intrinsic interaction of dark matter self-scattering on structure formation. By introducing a simplified model and a new definition of velocity dependence, the impact of dark protons on cosmological structures is revealed.
Article
Physics, Particles & Fields
Vicente Vento
Summary: The study focuses on the existence of monopoles and dipoles in Kaluza-Klein multidimensional theories, with the observation that monopoles interact with time-dependent magnetic fields to radiate in a manner that is undetectable by conventional equipment. This suggests that Kaluza-Klein monopolium, if existent, could potentially be a candidate for a primordial dark matter constituent.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Francesco Pace, Carlo Schimd
Summary: This study extends the analysis of Pace et al. by considering the virialization process in clustering dark-energy models. The research finds that five out of seven clustering dark-energy models can be statistically distinguished from the Lambda CDM model and the corresponding smooth dark-energy models in large-scale surveys.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Claudia de Rham, Scott Melville, Johannes Noller
Summary: Positivity bounds have been used to constrain scalar-tensor theories of dark energy, but coupling to matter fields has played a limited role. Demanding positivity when including interactions with standard matter fields leads to further constraints on the dark energy parameter space. Implementing these bounds as theoretical priors affects cosmological parameter constraints and shows that gravitational waves must travel superluminally on cosmological backgrounds in a standard UV completion.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Physics, Multidisciplinary
Jhonny A. Agudelo Ruiz
Summary: In this work, scalar field actions minimally and non-minimally coupled to gravity are analytically constructed, showing their equivalence to RRG in producing the same cosmological solutions. Additionally, the potential of combining a scalar field model for WDM with dynamical dark energy in the form of a running cosmological constant is also explored.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Astronomy & Astrophysics
David Benisty, Moshe M. Chaichian, Markku Oksanen
Summary: This passage studies the phenomenological implications of the Mimetic Tensor-Vector-Scalar theory (MiTeVeS). The theory extends the vector field model of mimetic dark matter by incorporating a scalar field, which is known to be ghost instability-free. When there is no interaction between the scalar field and the vector field, the obtained cosmological solution corresponds to the General Theory of Relativity (GR) with a minimally-coupled scalar field. However, introducing an interaction term between the scalar field and the vector field results in interesting dynamics.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Astronomy & Astrophysics
Wenzhong Liu, Luis A. Anchordoqui, Eleonora Di Valentino, Supriya Pan, Yabo Wu, Weiqiang Yang
Summary: In recent cosmological observations, discrepancies have been found in the rate of expansion of the universe and the clustering of matter. A novel model proposes that cold dark matter disintegrates into dark radiation. However, this model fails to solve the discrepancy in the rate of expansion, although it can address the clustering issue under certain conditions. The effectiveness of these models is weakened when intermediate-redshift data is included.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Subinoy Das, Anshuman Maharana, Vivian Poulin, Ravi Kumar Sharma
Summary: This paper investigates the discrepancy between the predicted and directly estimated values of S-8 and explores the possibility of power suppression due to the contribution of nonthermal hot dark matter to the energy density of the Universe. It is found that Planck data can decrease the tension, but does not support a nonzero contribution. Combining with other measurements, the existence of a particle with specific mass and contribution is suggested. The implications for other nonthermal HDM models are discussed, as well as the potential connection to the short baseline oscillation anomaly.
Article
Astronomy & Astrophysics
J. Chaves-Montero, S. Bonoli, B. Trakhtenbrot, A. Fernandez-Centeno, C. Queiroz, L. A. Diaz-Garcia, R. M. Gonzalez Delgado, A. Hernan-Caballero, C. Hernandez-Monteagudo, C. Lopen-Sanjuan, R. Overzier, D. Sobral, L. R. Abramo, J. Alcaniz, N. Benitez, S. Carneiro, A. J. Cenarro, D. Cristobal-Hornillos, R. A. Dupke, A. Ederoclite, A. Marin-Franch, C. Mendes de Oliveira, M. Moles, L. Sodre Jr, K. Taylor, J. Varela, H. Vazquez Ramio, T. Civera
Summary: This study develops a novel method for calculating black hole masses using measurements of continuum luminosities and emission line widths from narrow-band observations. The results show that this technique can achieve similar precision to single-epoch spectroscopy. The findings of this research are important for exploring the physical properties of quasar populations that do not meet the preselection criteria of previous spectroscopic surveys.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Saulo Carneiro, Cassio Pigozzo
Summary: It is argued that the quantum of area between consecutive, high overtones quasinormal modes of a black hole horizon coincides with the area gap predicted by Loop Quantum Gravity, as long as the horizon is isolated and the Barbero-Immirzi parameter is gamma approximate to root 3/6 in agreement with the value derived from the Bekenstein-Hawking horizon entropy.
GENERAL RELATIVITY AND GRAVITATION
(2022)
Correction
Astronomy & Astrophysics
Saulo Carneiro, Cassio Pigozzo
GENERAL RELATIVITY AND GRAVITATION
(2022)
Article
Physics, Multidisciplinary
S. Carneiro, C. Pigozzo, J. S. Alcaniz
Summary: Recent studies found that a small error in type Ia supernovae measurements can affect the estimation of cosmological parameters, particularly when low-redshift supernovae are included. This can result in a reduction of approximately 5% in the value of the local Hubble constant.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Astronomy & Astrophysics
C. Lopez-Sanjuan, P-E Tremblay, A. Ederoclite, H. Vazquez Ramio, A. J. Cenarro, A. Marin-Franch, J. Varela, S. Akras, M. A. Guerrero, F. M. Jimenez-Esteban, R. Lopes de Oliveira, A. L. Chies-Santos, J. A. Fernandez-Ontiveros, R. Abramo, J. Alcaniz, N. Benitez, S. Bonoli, S. Carneiro, D. Cristobal-Hornillos, R. A. Dupke, C. Mendes de Oliveira, M. Moles, L. Sodre Jr, K. Taylor
Summary: The white dwarf population in miniJPAS was analyzed using data from the Javalambre Physics of the accelerating Universe Astrophysical Survey (J-PAS). The results indicate that J-PAS photometry can provide precise effective temperatures and atmospheric compositions for white dwarfs, which are close to those obtained from spectroscopy.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
P. T. Rahna, Z-Y Zheng, A. L. Chies-Santos, Z. Cai, D. Spinoso, I Marquez, R. Overzier, L. R. Abramo, S. Bonoli, C. Kehrig, L. A. Diaz-Garcia, M. Povic, R. Soria, J. M. Diego, T. Broadhurst, R. M. Gonzalez Delgado, J. Alcaniz, N. Benitez, S. Carneiro, A. J. Cenarro, D. Cristobal-Hornillos, R. A. Dupke, A. Ederoclite, A. Hernan-Caballero, C. Lopez-Sanjuan, A. Marin-Franch, C. Mendes de Oliveira, M. Moles, L. Sodre, K. Taylor, J. Varela, H. Vazquez Ramio
Summary: This study reports the discovery of double-core Lyman alpha morphology around two high redshift quasi-stellar objects (QSOs) using miniJPAS survey data. The QSOs exhibit extended Lyman alpha and other spectral line morphologies, making them potential candidates for enormous Lyman alpha nebulae.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
J. Laur, E. Tempel, A. Tamm, R. Kipper, L. J. Liivamagi, A. Hernan-Caballero, M. M. Muru, J. Chaves-Montero, L. A. Diaz-Garcia, S. Turner, T. Tuvikene, C. Queiroz, C. R. Bom, J. A. Fernandez-Ontiveros, R. M. Gonzalez Delgado, T. Civera, R. Abramo, J. Alcaniz, N. Benitez, S. Bonoli, S. Carneiro, J. Cenarro, D. Cristobal-Hornillos, R. Dupke, A. Ederoclite, C. Lopez-Sanjuan, A. Marin-Franch, C. M. de Oliveira, M. Moles, L. Sodre, K. Taylor, J. Varela, H. Ramio
Summary: The importance of photometric galaxy redshift estimation is increasing with the development of observational facilities. In this study, a new photometric redshift estimation workflow (TOPz) is developed and tested on miniJPAS survey data. The results show that TOPz achieves the expected redshift accuracy for the upcoming large-scale survey J-PAS and limiting the number of spectra in the template set can further improve the accuracy.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
A. Hernan-Caballero, C. N. A. Willmer, J. Varela, C. Lopez-Sanjuan, A. Marin-Franch, H. Vazquez Ramio, T. Civera, A. Ederoclite, D. Muniesa, J. Cenarro, S. Bonoli, R. Dupke, J. Lim, J. Chaves-Montero, J. Laur, C. Hernandez-Monteagudo, J. A. Fernandez-Ontiveros, A. Fernandez-Soto, L. A. Diaz-Garcia, R. M. Gonzalez Delgado, C. Queiroz, J. M. Vilchez, R. Abramo, J. Alcaniz, N. Benitez, S. Carneiro, D. Cristobal-Hornillos, C. Mendes de Oliveira, M. Moles, L. Sodre Jr, K. Taylor
Summary: The Javalambre-Physics of the Accelerating Universe Astrophysical Survey (J-PAS) is an astronomical observation project that uses the Javalambre Survey Telescope (JST) and 56 narrow-band filters to observe approximately one-third of the northern sky. Two small surveys, J-NEP and miniJPAS, were conducted to demonstrate the scientific potential and test a new method for the calibration of photometry. The results show that J-NEP has significantly improved performance in terms of depth compared to miniJPAS.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
I. E. Lopez, M. Brusa, S. Bonoli, F. Shankar, N. Acharya, B. Laloux, K. Dolag, A. Georgakakis, A. Lapi, C. Ramos Almeida, M. Salvato, J. Chaves-Montero, P. Coelho, L. A. Diaz-Garcia, J. A. Fernandez-Ontiveros, A. Hernan-Caballero, R. M. Gonzalez Delgado, I. Marquez, M. Povic, R. Soria, C. Queiroz, P. T. Rahna, R. Abramo, J. Alcaniz, N. Benitez, S. Carneiro, J. Cenarro, D. Cristobal-Hornillos, R. Dupke, A. Ederoclite, C. Lopez-Sanjuan, A. Marin-Franch, C. Mendes de Oliveira, M. Moles, L. Sodre Jr, K. Taylor, J. Varela, H. V. Ramio
Summary: Studies show evidence of a scaling relation between supermassive black hole mass (M-BH) and the stellar mass of host galaxies (M-?) in the local Universe, as well as similar evolutions of their differential terms (SFR and BHAR) across cosmic times. However, the understanding of this coevolution is still limited.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Physics, Multidisciplinary
S. Carneiro, F. C. Sobrinho
Summary: It is suggested that the precession of the boosted neutrino magnetic moments in the external magnetic field may explain the tension between the muon anomalous g-factor measured in the Muon g - 2 experiments and the theoretical value predicted by the Standard Model. As the neutrinos and positron resulting from the muon decay are entangled prior to the positron detection, the interaction of the neutrino dipoles with the magnetic field gives origin to an uncertainty in the time modulation of the positron angular distribution. The translated uncertainty in the muon g-factor, delta a(mu) approximate to (1.96 +/- 0.68) ppm, presents 1 sigma agreement with the anomaly measured at Fermilab, delta a(mu) approximate to (2.14 +/- 0.50) ppm. A dependence of the anomaly on the positron energy is also predicted and can be experimentally verified. A fitting of the Brookhaven binned data suggests such a dependence, with chi(2)(r) = 0.86, better than with an energy-independent anomaly, which gives chi(2)(r) = 0.78.
BRAZILIAN JOURNAL OF PHYSICS
(2023)
Article
Astronomy & Astrophysics
F. C. Sobrinho, H. A. Borges, I. P. R. Baranov, S. Carneiro
Summary: Effective models of quantum black holes inspired by LQG successfully replace the classical singularity with a hypersurface of transition and have been able to describe Schwarzschild black holes as well as Planck scale black holes. The quantization method used by Alonso-Bardaji, Brizuela, and Vera preserves the classical form of the angular part of the metric and retains the same horizon area as in the classical theory. The exterior metric generated through a phase rotation shows that the Kretschmann scalar is the same as in the classical Schwarzschild solution, but with a screened central mass due to quantum fluctuations.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
Nicolas R. Bertini, Hermano Velten
Summary: The f(R, T) gravity is a model that contains an arbitrary function of the Ricci scalar R and the trace of the energy-momentum tensor T in its action. By analyzing the dynamical equations for perfect fluids, it is determined how the function & phi; depends on T, regardless of the equation of state and geometry of the matter fields. The analysis of the parametrized post-Newtonian (PPN) formalism shows that the linear dependence of & phi; on T is severely constrained.
Article
Astronomy & Astrophysics
Diego Santos de Jesus, Hermano Velten, Federico Piazza
Summary: In this paper, we revisit the decay of the orbital period in binary systems caused by the emission of gravitational waves, considering modified gravity models where the coupling Ggw between matter and on shell gravitons differs from the Newton constant GN. By using the double pulsar, the most precisely-timed double neutron star binary system, we constrain the ratio Ggw=GN to the level of 10-4, improving the present bound on this quantity by two orders of magnitude.
Article
Physics, Multidisciplinary
Felipe S. Escorcio, Julio C. Fabris, Junior D. Toniato, Hermano Velten
Summary: This article proposes a Newtonian-like theory inspired by the Brans-Dicke gravitational Lagrangian, which can explain the problem of the perihelion advance of Mercury and constrain the free parameter of the theory through predicted expressions.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Astronomy & Astrophysics
Raquel Emy Fazolo, Luca Amendola, Hermano Velten
Summary: This study investigates the role of dark energy perturbations in the skewness S-3 of large-scale matter distribution. A two-fluid universe composed of matter and dark energy, with perturbations in both components, is considered. The skewness of the matter density field is numerically estimated as a function of the dark energy parameters. The study characterizes the S-3 value for quintessence and phantom dark energy cosmologies, and its dependence on the matter density parameter and the dark energy sound speed, providing accurate numerical fitting. These fits can be used to test cosmology against future high-quality data on large-scale structure.