In this Letter, we propose a new and model-independent cosmological test for the distance–duality (DD) relation, η = DL(z)(1 + z)−2/DA(z) 1, where DL DA are, respectively, luminosity angular diameter distances. For consider two sub-samples of Type Ia supernovae (SNe Ia) taken from Constitution data whereas distances are provided by samples galaxy clusters compiled De Filippis et al. Bonamente combining Sunyaev–Zeldovich effect X-ray surface brightness. The SNe redshifts each sub-sample were...

Observations in the cosmological domain are heavily dependent on validity of cosmic distance-duality (DD) relation, D_L(z) (1 + z)^{2}/D_{A}(z) = 1, an exact result required by Etherington reciprocity theorem where and D_A(z) are, respectively, luminosity angular diameter distances. In limit very small redshifts this ratio is trivially satisfied. Measurements Sunyaev-Zeldovich effect (SZE) X-rays combined with DD relation have been used to determine D_A(z)from galaxy clusters. This...

The angular diameter distances toward galaxy clusters can be determined with measurements of the Sunyaev-Zel'dovich effect and X-ray surface brightness combined validity distance-duality relation, $D_L(z) (1 + z)^{2}/D_{A}(z) = 1$, where $D_L(z)$ $D_A(z)$ are, respectively, luminosity distances. This combination enables us to probe cluster physics or even test relation itself. We explore these possibilities based on two different, but complementary approaches. Firstly, in order constrain...

Abstract The Alcubierre warp drive metric is a spacetime geometry featuring distortion, called bubble, where massive particle inside it acquires global superluminal velocities, or speeds. This work presents solutions of the Einstein equations for having fluid matter as gravity source. energy–momentum tensor considered has two contents, perfect and parametrized (PPF), tentative more flexible model whose aim to explore possibilities with positive density content. Santos-Pereira et al. (Eur...

Evidence is presented that the galaxy distribution can be described as a fractal system in redshift range of FDF survey. The dimension $D$ was derived using volume number densities spatially homogeneous standard cosmological model with $\Omega_{m_0}=0.3$, $\Omega_{\Lambda_0}=0.7$ and $H_0=70 \; \mbox{km} {\mbox{s}}^{-1} {\mbox{Mpc}}^{-1}$. ratio between differential integral $\gamma$ $\gamma^\ast$ obtained from red blue galaxies provides direct method to estimate $D$, implying vary...

This paper discusses the empirical validity of Goodwin's (1967) macroeconomic model growth with cycles by assuming that individual income distribution Brazilian society is described Gompertz-Pareto (GPD). formed combination Gompertz curve, representing overwhelming majority population (~99%), Pareto power law, tiny richest part (~1%). In line original model, we identify Gompertzian workers and Paretian component class capitalists. Since GPD parameters are obtained for each year Goodwin...

view Abstract Citations (52) References (38) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On Modeling a Relativistic Hierarchical (Fractal) Cosmology by Tolman's Spacetime. I. Theory Ribeiro, Marcelo B. In this work we examine relativistic model for the observed inhomogeneities of large-scale structure where make hypothesis that can be described as being self-similar fractal system. The old Charlier concept hierarchical clustering is identified with...

Abstract The Alcubierre metric is a spacetime geometry where massive particle inside distortion, called warp bubble, able to travel at velocities arbitrarily higher than the velocity of light, feature known as drive. This consequence general relativity, which allows for global superluminal but restricts local speeds subluminal ones required by special relativity. In this work we solved Einstein equations drive considering dust matter distribution source, since was not originally advanced...

This paper presents a review of the fractal approach for describing large scale distribution galaxies.We start by presenting brief, but general, introduction to fractals, which emphasizes their empirical side and applications rather than mathematical side.Then we discuss standard correlation function analysis galaxy catalogues many observational facts that brought increasing doubts about reliability this method, paying special attention implicit assumption an eventual homogeneity...

The type 2 deiodinase (D2) activates the prohormone T4 to T3. D2 is expressed in skeletal muscle (SKM), and its global inactivation (GLOB-D2KO mice) reportedly leads hypothyroidism impaired differentiation. Here floxed Dio2 mice were crossed with expressing Cre-recombinase under myosin light chain 1f (cre-MLC) disrupt expression late developmental stages of myocytes (SKM-D2KO). This led a loss approximately 50% activity neonatal adult SKM-D2KO about 75% isolated myocytes. To test impact...

Abstract This paper discusses if large scale galaxy distribution samples containing almost one million objects can be characterized as fractal systems. The analysis performed by Teles et al. (Phys Lett B 813:136034, 2021) on the UltraVISTA DR1 survey is extended here to SPLASH and COSMOS2015 catalogs, hence adding 750k new galaxies with measured redshifts studied samples. standard $$\Lambda $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>Λ</mml:mi> </mml:math> CDM...

A spatially homogeneous Bianchi type VI0 model containing a viscous fluid in the presence of an axial magnetic field has been studied. barotropic equation state together with pair linear relations among square root matter density, shear scalar, and expansion scalar have assumed. Solutions are obtained field, only two special cases, which comparatively simpler. The complete solutions for this absence also obtained. former case however, does not effect cause any major modification fundamental...

This paper presents numerical solutions of particular Lemaitre-Tolman models approximating a fractal behaviour along the past light cone, as discussed in I (0807.0866) this series. The initial conditions problem are and algorithm used to carry out integrations is presented. It was found that stiff across flat-curved interface necessary obtain problem. spatially homogeneous Friedmann treated special cases solution solved numerically. Extending results II (0807.0869) on Einstein-de Sitter...

view Abstract Citations (34) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On Modeling a Relativistic Hierarchical (Fractal) Cosmology by Tolman's Spacetime. II. Analysis of the Einstein--de Sitter Model Ribeiro, Marcelo B. This paper studies spatially homogeneous Einstein-de cosmological model in context relativistic hierarchical (fractal) cosmology as developed I (0807.0866). The is treated special case Lemaitre-Tolman's spacetime,...

This work describes the use of ultrasound biomicroscopy (UBM) to follow up degeneration-regeneration process after a laceration injury induced in lateral gastrocnemius (LG) and soleus (SOL) muscles rats. UBM (40 MHz) images were acquired used for biomechanical characterization muscular tissue, specifically using pennation angle (PA) muscle thickness (MT). The animals distributed three groups: variability group (VG; N=5), injured (GG; N=6) (SG; N=5). VG rats assess data reliability...

This paper aims to connect the theory of relativistic cosmology number counts with astronomical data, practice, and behind galaxy luminosity function (LF). We treat galaxies as building blocks universe but ignore most aspects their internal structures by considering them point sources. However, we do consider general morphological types in order use data from redshift surveys, where some kind classification is adopted. start a treatment for spacetime, not just...

This paper studies the effect of distance choice in radial (non-average) statistical tools used for fractal characterization galaxy distribution. After reviewing basics measuring distances cosmological sources, various definitions are to calculate differential density $\gamma$ and integral $\gamma^\ast$} dust distribution Einstein-de Sitter cosmology. The main results as follows: (1) plays a crucial role determining scale where relativistic corrections must be taken into account, both...