Article
Astronomy & Astrophysics
Eoin O. Colgain, M. M. Sheikh-Jabbari
Summary: Observations restrict the parameter space of holographic dark energy (HDE) and lead to a turning point in the Hubble parameter. The turning point violates the null energy condition and may be interpreted as an evolution of the Hubble constant with redshift, contradicting the FLRW framework within which data has been analyzed. Comparison of fits disfavors HDE relative to flat Lambda CDM model.
CLASSICAL AND QUANTUM GRAVITY
(2021)
Article
Multidisciplinary Sciences
Gargee Chakraborty, Surajit Chattopadhyay, Ertan Gudekli, Irina Radinschi
Summary: This study investigates the cosmological consequences and thermodynamics of Barrow holographic dark energy (HDE), incorporating viscosity and reconstructions of parameters associated with Barrow HDE. Observations of quintessence and quintom behavior, as well as the validity of the generalized second law of thermodynamics, are reported. The study demonstrates the physical viability of considering Barrow HDE as a specific case of NO HDE but concludes that the model is limited to being very close to ΛCDM and cannot go beyond it.
Article
Physics, Multidisciplinary
Kangujam Priyokumar Singh, Pheiroijam Suranjoy Singh
Summary: In this work, a minimally interacting holographic dark energy model is investigated within the framework of the Saez-Ballester Theory, using a spherically symmetric metric. The prediction suggests that the dominant dark energy component in the universe is of phantom type, leading to cosmic doomsday. However, to resolve the incompatibility between the big rip singularity and holographic dark energy, a higher dimensional scenario is employed, replacing the cosmic doomsday with a de-Sitter phase. The model exhibits a slow and uniform change of size during early evolution, which accelerates as time progresses, consistent with current observations of accelerated expansion. The measured values of the Hubble parameter and the dark energy EoS parameter are found to be in agreement with the most recent Planck 2018 result.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Physics, Mathematical
Grishma Verma, Rajesh Kumar, K. R. Mishra
Summary: In this work, the effect of dark energy (DE) on singularity formation is studied in the gravitational collapse of a spherically symmetric radiating star. It is shown that the DE component plays a crucial role in the formation of black holes.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2022)
Article
Physics, Multidisciplinary
Cameron W. Johnson, Amy E. Turner, F. Javier Garcia de Abajo, Benjamin J. McMorran
Summary: A novel scanning electron Mach-Zehnder interferometer constructed in a conventional transmission electron microscope is used to perform inelastic interferometric imaging with free electrons. This technique is sensitive to the phase of localized optical modes and provides a new platform for controlling the transverse momentum of free electrons and studying coherent electron-matter.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
J. T. Amaral, D. A. Fagundes, M. V. T. Machado
Summary: In this study, the Amaral-Gay Ducati-Betemps-Soyez saturation model is reviewed and updated by testing it against recent H1-ZEUS combined data on deep inelastic scattering. The model, based on Balitsky-Kovchegov equation traveling wave solutions in momentum space framework, accurately describes reduced cross section, sigma, and DIS structure functions measured at HERA. Additionally, it provides good descriptions of heavy quark structure functions at small-x and low Q(2), and offers predictions for future measurements at LHeC.
Article
Physics, Mathematical
Anjali Pandey, Rajesh Kumar, Sudhir Kumar Srivastava
Summary: This paper investigates the gravitational collapse of a shear-free inhomogeneous spherical star, consisting of dust fluid and in the background of dark energy components. The development of an apparent horizon is discussed to investigate the formation of black holes during the collapsing process. The collapse is examined separately for dust cloud and dark energy, as well as under the combined effect of both. The study concludes that under certain conditions, the collapse of either dust cloud or dark energy can lead to black hole formation, but when both are present, the collapsing star does not form a black hole. However, if dark energy is considered as a cosmological constant, the collapse results in the formation of a black hole.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2022)
Article
Astronomy & Astrophysics
Peter W. Graham, Selcuk Haciomeroglu, David E. Kaplan, Zhanibek Omarov, Surjeet Rajendran, Yannis K. Semertzidis
Summary: Proton storage ring experiments designed to search for proton electric dipole moments can also be used to investigate nearly dc spin precession induced by dark energy and ultralight dark matter. These experiments are sensitive to both axion-like and vector fields, with current technology permitting probes of these phenomena up to 3 orders of magnitude beyond astrophysical limits. The relativistic boost of the protons in these rings enables sensitivities comparable to atomic comagnetometer experiments, allowing the extraction of microphysics of signals and differentiation between pseudoscalar, magnetic, and electric dipole moment interactions.
Article
Astronomy & Astrophysics
Florian Niedermann, Martin S. Sloth
Summary: Hot new early dark energy is a supercooled phase transition that occurs at sub-eV temperatures in the dark sector. It provides a possible solution to the Hubble tension and explains neutrino masses through the inverse seesaw mechanism.
Article
Materials Science, Multidisciplinary
Efim A. Brener, Eran Bouchbinder
Summary: Frictional shear cracks exhibit unconventional singularities with a singularity order xi that differs from the conventional -1/2 one, depending on the friction law, propagation speed, and symmetry mode of loading. This challenges the assumption of universal square root near-edge singularity in Linear Elastic Fracture Mechanics, highlighting the importance of considering the intrinsic dependence of frictional strength on slip rate in understanding frictional phenomena.Explicit calculations are presented for linear viscous-friction, applicable to both in-plane and anti-plane shear loadings.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Astronomy & Astrophysics
A. Arbey, J-F Coupechoux
Summary: This paper explores the possibility of a scalar field replacing dark matter, dark energy, and inflation by introducing a non-minimal coupling to gravity, a Mexican hat potential, and spontaneous symmetry breaking. The scalar field behaves like a dark fluid after inflation, mimicking the properties of both dark energy and dark matter.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Ze-Wei Zhao, Ling-Feng Wang, Ji-Guo Zhang, Jing-Fei Zhang, Xin Zhang
Summary: This research investigates the capability of future fast radio bursts (FRBs) to constrain the dimensionless coupling parameter in interacting dark energy (IDE) models. The results suggest that future observations have the potential to provide tighter constraints on this parameter compared to current data, offering a promising avenue for precise measurements.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
F. Hautmann, M. Hentschinski, L. Keersmaekers, A. Kusina, K. Kutak, A. Lelek
Summary: Off-shell, transverse-momentum dependent splitting functions are defined from the high-energy limit of partonic decay amplitudes. Based on these functions, a new parton branching algorithm is formulated and implemented. Numerical results are used to explicitly verify momentum sum rules for TMD parton distributions.
Article
Green & Sustainable Science & Technology
Masamichi Ohba, Yuki Kanno, Daisuke Nohara
Summary: This study investigates the synoptic-scale summer weather patterns associated with dark doldrums in East Japan. It finds that frequent occurrences of dark doldrums are linked to four typical weather patterns, which are influenced by the monsoon rain front and the Okhotsk high-pressure system. The frequency of dark doldrum events also shows considerable interannual variability connected to climate variations in the tropical Indo-western Pacific.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Physics, Particles & Fields
Federico Silvetti, Marco Bonvini
Summary: In this work, we extend previous results on high-energy (or small-x) resummation to differential distributions in rapidity, transverse momentum, and invariant mass, and implement them in the public code HELL.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Miguel Cruz, Samuel Lepe, Gerardo Morales-Navarrete
CLASSICAL AND QUANTUM GRAVITY
(2019)
Article
Astronomy & Astrophysics
Victor H. Cardenas, Miguel Cruz, Samuel Lepe, Patricio Salgado
Summary: The study explores mimetic gravity formulation with a scalar field potential, not assuming any specific form beforehand. By parameterizing the fluid state and constructing an explicit function for the potential based on cosmological redshift, analytical solutions in mimetic gravity can be obtained. The cosmological implications of these results are revised, and a numerical reconstruction for the potential as a function of the mimetic scalar field is performed.
PHYSICS OF THE DARK UNIVERSE
(2021)
Article
Astronomy & Astrophysics
Victor H. Cardenas, Miguel Cruz, Samuel Lepe
Summary: This work examines the application of holographic dark energy approach and matter creation effects in a single cosmological model, discussing interesting cases and testing the model against recent observations. The model shows a transition from decelerated cosmic expansion to accelerated expansion based on the best fit values for the free cosmological parameters. However, the deceleration-acceleration transition cannot be consistently determined from the coincidence parameter in this model. At the effective level, the parameter state associated with the overall energy density contribution describes a quintessence scenario in the fluid analogy at the present time.
PHYSICS OF THE DARK UNIVERSE
(2022)
Article
Astronomy & Astrophysics
Miguel Cruz, Samuel Lepe, German E. Soto
Summary: In this article, we review a dynamical dark energy model that has rarely been studied in the literature and propose two possible generalizations. By exploring the behavior of the original model and a minimal extension, we find that the cosmic components are related to their parameter states. In order to investigate the phantom regime, we present two dark energy densities inspired by the holographic approach and the emergent entropic forces model. We discover a type-III singularity in the first case and a transition from decelerated to accelerated cosmic expansion in the second proposal, ultimately leading to a de Sitter state.
Article
Astronomy & Astrophysics
Victor H. Cardenas, Miguel Cruz, Samuel Lepe
Article
Astronomy & Astrophysics
Victor H. Cardenas, Miguel Cruz, Samuel Lepe, Shin'ichi Nojiri, Sergei D. Odintsov