Showing papers in "Physics of the Dark Universe in 2019"

TL;DR: MontePython as mentioned in this paper is a parameter inference package for cosmology, which has been developed over the past couple of years and has two new ingredients contributing to improve the performance of Metropolis-Hastings sampling.

TL;DR: In this article, the authors re-analyse current single-field inflationary models related to primordial black hole formation and show that, for all of them, the gaussian approximation, which is typically used to estimate the primordial Black holes abundances, fails.

TL;DR: MadDM v.3.0 as discussed by the authors is a numerical tool to compute particle dark matter observables in generic new physics models, such as the annihilation cross section at present time and the energy spectra of prompt photons, cosmic rays and neutrinos resulting from dark matter annihilation.

TL;DR: In this paper, the authors assess the current status of dynamical dark energy (DDE) in the light of a large body of updated SNIa+ H ( z ) + BAO+LSS+CMB observations, using the full Planck 2015 CMB likelihood.

TL;DR: In this article, the cosmological features of Tsallis holographic dark energy (THDE) in cyclic, DGP and RS II braneworlds were studied.

TL;DR: In this article, the authors presented a new Hamiltonian formulation for strongly coupled magnons and photons, which hybridise as cavity-magnon polaritons and have an extended measurable dispersive regime, which allows any ferromagnetic haloscope to achieve improved bandwidth with respect to the axion mass parameter space.

TL;DR: In this article, a class of interacting models is introduced via a real function f r of the ratio r between the energy densities of the (pressureless) cold dark matter (CDM) and dark energy (DE).

TL;DR: In this article, the authors consider a class of interacting dark energy models in a flat and nonflat FLRW universe where the interaction is characterized by the modified evolution of the pressureless dark matter as a − 3 + δ ( a ), a being the FLRW scale factor and δ( a ) quantifies the interaction rate.

TL;DR: In this paper, a quintessence field which transitions from a matter-like to a cosmological constant behavior between recombination and the present time is considered to ease the tension in the measurement of the present Hubble rate.

TL;DR: Weakly-coupled TeV-scale particles may mediate the interactions between normal matter and dark matter as discussed by the authors, leading to the familiar "mono-X" search signatures, but also producing signals without missing momentum via the same vertices involved in their production.

TL;DR: In this article, the authors investigated the cosmological constraints on sterile neutrinos in a universe in which vacuum energy interacts with cold dark matter by using latest observational data and employed the parametrized post-Friedmann (PPF) approach for interacting dark energy to do the calculation of perturbation evolution.

TL;DR: In this article, the authors considered the flat FRW universe with interacting dark energy models and cold dark matter within the framework of DGP braneworld and explored the different cosmological quantities like the equation of state parameter, deceleration parameter, squared speed of sound, statefinder parameters, ω − ω ′ plane and Om diagnostic.

TL;DR: In this paper, the authors argue that dark matter in the form of macroscopically large nuggets of standard model quarks and antiquarks can help to alleviate the tension between standard model cosmology and the recent EDGES observation of a stronger than anticipated 21 cm absorption feature.

TL;DR: In this article, an improved model-independent method was proposed to probe the curvature parameter Ω k and make the first measurement of the cosmic curvature referring to a distant past, with redshifts up to z ∼ 3. 0.

TL;DR: In this article, a cosmological model-independent approach was proposed to investigate the opacity of the universe in the presence of GWs in the FLRW metric, where GWs propagate freely through a perfect fluid without any absorption and dissipation, providing a distance measurement unaffected by the cosmic opacity.

TL;DR: In this paper, the authors address three genuine phantom dark energy models where each of them induces the particular future events known as Big Rip, Little Rip and Little Sibling of the Big Rip.

TL;DR: In this article, the same adjusted parameters yield a good fit to the radial acceleration relation (RAR) of MLS, with the RAR parameter a 0 = ( 5. 4 ±. 3 ) × 1 0 − 11 m ∕ s 2.

TL;DR: In this article, a model of the emergent dark universe is studied, where the holographic fluid on the hypersurface is assumed to play the role of the dark sector, mainly including the dark energy and apparent dark matter.

TL;DR: In this article, a new class of galactic halo axion detection techniques based on precision frequency and phase metrology was investigated, and it was demonstrated how a dual mode cavity exhibits linear mode-mode coupling mediated by the axion upconversion and axion downconversion processes.

TL;DR: In this paper, a model of quartessence, a single dark component mimicking both dark matter and dark energy, whose non-vanishing sound speed inhibits structure growth at late times on scales smaller than its corresponding Jeans' length is proposed.

TL;DR: In this article, an extension of the Ruffini-Arguelles-Rueda (RAR) model for the distribution of DM in galaxies, by including for escape of particle effects, was introduced.

TL;DR: In this paper, neutral particle motion and collisional Penrose process in ergoregion of the braneworld Kerr black hole is investigated. And the expression for the efficiency of energy extraction from the brane Kerr blackhole is found.

TL;DR: In this article, a reformulation of axion modified electrodynamics is presented where the equations maintain a similar form to the unmodified Maxwell's equations, with all modifications redefined within the constitutive relations between the D →, H →, B → and E → fields.

TL;DR: In this article, it was shown that cold dark matter axions reach thermal contact with baryons, and therefore cool them, shortly after the axions thermalize among themselves and form a Bose-Einstein condensate.

TL;DR: In this article, the authors apply an effective approximation to the classical Maxwell's equations to get a correct form of the equations only for the induced fields, and rigorously solve the equations for induced fields to obtain a close form of electromagnetic fields under various experimental conditions in the axion resonance regime.

TL;DR: In this paper, new observational constraints on Lorentz violating Hořava-Lifshitz cosmological scenarios using an updated cosmology data set from Cosmic Microwave Background (Planck CMB), expansion rates of elliptical and lenticular galaxies, JLA compilation (Joint Light-Curve Analysis) data for Type Ia supernovae (SneIa), Baryon Acoustic Oscillations (BAO) and priors on the Hubble parameter with an alternative parameterisation of the equations.

TL;DR: In this paper, the authors report on the first measurement with a sensitive opto-mechanical force sensor designed for the direct detection of coupling of real chameleons to matter.

TL;DR: In this article, the authors present constraints on non-minimal couplings from current CMB data under the assumption of power-law potentials and show that models with n > 2 show a statistically significant indication (above 95% C.L.) for a non minimal coupling.

TL;DR: In this paper, the authors consider the CMB constraints on reheating and dark matter parameter space for a specific plateau type inflationary model and general inflaton equation of state parameter.

TL;DR: In this article, a radiative seesaw model at one-loop level was proposed, where fields with large multiplet of S U ( 2 ) L were introduced, and any additional symmetries are not needed.