Irreversible thermodynamical description of warm inflationary cosmological models
Publication date: Available online 6 March 2020Source: Physics of the Dark UniverseAuthor(s): Tiberiu Harko, Haidar Sheikhahmadi (Source: Physics of the Dark Universe)
Source: Physics of the Dark Universe - March 7, 2020 Category: Physics Source Type: research
High accuracy on H0 constraints from gravitational wave lensing events
Publication date: Available online 4 March 2020Source: Physics of the Dark UniverseAuthor(s): Paolo Cremonese, Vincenzo Salzano (Source: Physics of the Dark Universe)
Source: Physics of the Dark Universe - March 5, 2020 Category: Physics Source Type: research
On the amount of peculiar velocity field information in supernovae from LSST and beyond
Publication date: Available online 29 February 2020Source: Physics of the Dark UniverseAuthor(s): Karolina Garcia, Miguel Quartin, Beatriz B. Siffert (Source: Physics of the Dark Universe)
Source: Physics of the Dark Universe - March 1, 2020 Category: Physics Source Type: research
Black holes and naked singularities from Anton–Schmidt’s fluids
Publication date: May 2020Source: Physics of the Dark Universe, Volume 28Author(s): Salvatore Capozziello, Rocco D’Agostino, Daniele Gregoris (Source: Physics of the Dark Universe)
Source: Physics of the Dark Universe - February 29, 2020 Category: Physics Source Type: research
Propagation of gravitational waves in Chern–Simons axion F(R) gravity
Publication date: Available online 27 February 2020Source: Physics of the Dark UniverseAuthor(s): Shin’ichi Nojiri, S.D. Odintsov, V.K. Oikonomou, Arkady A. Popov (Source: Physics of the Dark Universe)
Source: Physics of the Dark Universe - February 29, 2020 Category: Physics Source Type: research
Confronting the warm vector inflation in Rastall theory of gravity with Planck 2018 data
Publication date: Available online 28 February 2020Source: Physics of the Dark UniverseAuthor(s): Rabia Saleem, Jahanzaib Hassan (Source: Physics of the Dark Universe)
Source: Physics of the Dark Universe - February 29, 2020 Category: Physics Source Type: research
Black holes and naked singularities from Anton-Schmidt’s fluids
Publication date: Available online 26 February 2020Source: Physics of the Dark UniverseAuthor(s): Salvatore Capozziello, Rocco D’Agostino, Daniele Gregoris (Source: Physics of the Dark Universe)
Source: Physics of the Dark Universe - February 27, 2020 Category: Physics Source Type: research
Construction of charged cylindrical gravastar-like structures
Publication date: Available online 27 February 2020Source: Physics of the Dark UniverseAuthor(s): Z. Yousaf (Source: Physics of the Dark Universe)
Source: Physics of the Dark Universe - February 27, 2020 Category: Physics Source Type: research
Effects of dark matter on the upper bound mass of neutron stars
Publication date: Available online 24 February 2020Source: Physics of the Dark UniverseAuthor(s): Sandeep Kumar S., Arun Kenath, C. SivaramAbstractObservations have indicated that we do not see neutron stars (NS) of mass near the theoretical upper limit as predicted. Here we invoke the role of dark matter (DM) particles in star formation, and their role in lowering the mass of remnants eventually formed from these stars. Massive stars can capture DM particles more effectively than the lower mass stars, thus further softening the equation of state of the remnant neutron stars. We also look at the capture of DM particles by ...
Source: Physics of the Dark Universe - February 24, 2020 Category: Physics Source Type: research
Beta-function formalism for k-essence constant-roll inflation
Publication date: Available online 24 February 2020Source: Physics of the Dark UniverseAuthor(s): Abolhassan Mohammadi, Tayeb Golanbari, Khaled SaaidiAbstractThe beta-function formalism is being used to study the constant-roll inflation in k-essence models. Assuming the second slow-roll parameter as a constant leads to a first-order differential equation for β-function which much easier to solve and find a solution than the second (non-linear) order equation that we have in the corresponding standard constant-roll inflation. Many cosmological models are known as a subclass of k-essence, so we will try to consider the mode...
Source: Physics of the Dark Universe - February 24, 2020 Category: Physics Source Type: research
Stratospheric temperature anomalies as imprints from the dark Universe
Publication date: Available online 14 February 2020Source: Physics of the Dark UniverseAuthor(s): K. Zioutas, A. Argiriou, H. Fischer, S. Hofmann, M. Maroudas, A. Pappa, Y.K. SemertzidisAbstractThe manifestation of the dark Universe begun with unexpected large-scale astronomical observations. Here we are investigating the possible origin of small-scale anomalies, like that of the annually observed temperature anomalies in the stratosphere (38.5 – 47.5 km). Unexpectedly within known physics, we observe a planetary relationship of the daily stratospheric temperature distribution. Interestingly, its spectral shape does not ...
Source: Physics of the Dark Universe - February 16, 2020 Category: Physics Source Type: research
Dynamical evidence of a dark solitonic core of 109M⊙ in the milky way
Publication date: Available online 13 February 2020Source: Physics of the Dark UniverseAuthor(s): Ivan De Martino, Tom Broadhurst, S.-H. Henry Tye, Tzihong Chiueh, Hsi-Yu SchiveAbstractA wavelike solution for the non-relativistic universal dark matter (wave-DM) is rapidly gaining interest, following pioneering simulations of cosmic structure as an interference pattern of coherently oscillating bosons. A prominent solitonic standing wave is predicted at the center of every galaxy, representing the ground state solution of the coupled Schrödinger-Poisson equations, and it has been identified with the wide, kpc scale dark co...
Source: Physics of the Dark Universe - February 14, 2020 Category: Physics Source Type: research
Galaxy cluster hydrostatic masses using Tolman–Oppenheimer–Volkoff equation
Publication date: Available online 13 February 2020Source: Physics of the Dark UniverseAuthor(s): Sajal Gupta, Shantanu DesaiAbstractMotivated by previous studies in literature about the potential importance of relativistic corrections to galaxy cluster hydrostatic masses, we calculate the masses of 12 relaxed clusters (with Chandra X-ray data) using the Tolman-Oppenheimer-Volkov (TOV) equation of hydrostatic equilibrium and the ideal gas equation of state. Analytical formulae for gas density and temperature profiles for these clusters, previously derived by Vikhlinin et al. (2006) were used to obtain these masses. We com...
Source: Physics of the Dark Universe - February 14, 2020 Category: Physics Source Type: research
Stability of self-gravitating anisotropic fluids in f(R,T) gravity
Publication date: Available online 14 February 2020Source: Physics of the Dark UniverseAuthor(s): M.Z. Bhatti, Z. Yousaf, M. YousafAbstractThis manuscript aims to discuss the factors holding in/stability of axially symmetric compact system with anisotropic environment in the background of f(R,T) gravity, where R is invariant Ricci curvature and T stands for trace of energy momentum tensor. We constituted field and conservation equations in the background of f(R,T) gravity. To establish the collapse equation, we make use of perturbation for all the variables involving in conservation equations, field equations, extra curvat...
Source: Physics of the Dark Universe - February 14, 2020 Category: Physics Source Type: research
Dark degeneracy I: Dynamical or interacting dark energy?
Publication date: Available online 10 February 2020Source: Physics of the Dark UniverseAuthor(s): Rodrigo von Marttens, Lucas Lombriser, Martin Kunz, Valerio Marra, Luciano Casarini, Jailson AlcanizAbstractWe revisit the dark degeneracy that arises from the Einstein equations relating geometry to the total cosmic substratum but not resolving its individual components separately. We establish the explicit conditions for the dark degeneracy in the fluid description of the dark sector. At the background level, this degeneracy can be formally understood in terms of a unified dark sector Equation of State (EoS) that depends bot...
Source: Physics of the Dark Universe - February 11, 2020 Category: Physics Source Type: research
