Abstract We consider the effective field theory formulation of torsional gravity in a cosmological framework to alter background evolution. Then we use latest H 0 measurement from SH0ES Team, as well observational Hubble data cosmic chronometer and radial baryon acoustic oscillations, reconstruct f ( T ) form model-independent way by applying Gaussian processes. Since special square-root term does not affect evolution at level, finally summarize family functions that can produce required...

Abstract We investigate the scalar perturbations and possible strong coupling issues of f ( T ) around a cosmological background, applying effective field theory (EFT) approach. revisit generalized EFT framework modified teleparallel gravity, apply it by considering both linear second-order for theory. find that no new mode is present in which suggests problem. However, based on ratio cubic to quadratic Lagrangians, we provide simple estimation scale, result shows problem can be avoided at...

This paper proposes a method to test Einstein's equivalence principle using the profile of black hole shadows. The shadow in edge-on view is found have different appearances at wavelengths observed light.

Abstract We calculate the quasinormal modes (QNM) frequencies of a test massless scalar field and an electromagnetic around static black holes in f ( T ) gravity. Focusing on quadratic modifications, which is good approximation for every realistic theory, we first extract spherically symmetric solutions using perturbative method, imposing two ansätze metric functions, suitably quantify deviation from Schwarzschild solution. Moreover, effective potential, then QNM frequency obtained...

ABSTRACT We employ Hubble data and Gaussian Processes in order to reconstruct the dynamical connection function $f(Q)$ cosmology beyond coincident gauge. In particular, there exist three branches of connections that satisfy torsionless curvatureless conditions, parametrized by a new $\gamma$. express redshift dependence $\gamma$ terms $H(z)$ form parameters, then we it using 55 observation data. First, investigate case where ordinary conservation law holds, function, which is very well...

In this paper we study implications of the possible excess 21-cm line global signal at epoch cosmic dawn on evolutions a class dynamically interacting dark energy (IDE) models. We firstly summarize two dynamical mechanisms in which different background can exert considerable effects signal. One is decoupling time Compton scattering heating, other stems from direct change optical depth due to expansion rate Universe. After that, investigate IDE models illustrate tension between results...

We calculate the deflection angle, as well positions and magnifications of lensed images, in case covariant $f(T)$ gravity. first extract spherically symmetric solutions for both pure-tetrad formulation theory, since considering spherical extension to latter is crucial, order results not suffer from frame-dependent artifacts. Applying weak-field, perturbative approximation we deviations comparing General Relativity. Furthermore, angle then differences lensing framework. This effect...

ABSTRACT This study aims to investigate the strong gravitational lensing effects in f(T) gravity. We present theoretical analytic expressions for gravity, including deflection angle, magnification, and time delay. On this basis, we also take plasma effect into consideration. compare between General Relativity a vacuum environment gravity environment. From strongly lensed fast radio burst, results indicate that environment, can generate indistinguishable image positions, but magnification...

Abstract We use galaxy–galaxy lensing data to test general relativity and f ( T ) gravity at galaxy scales. consider an exact spherically symmetric solution of theory, which is obtained from approximate quadratic correction, thus it expected hold for every realistic deviation relativity. Quantifying the by a single parameter Q , following post-Newtonian approximation, we obtain corresponding in gravitational potential, shear component, effective excess surface density profile. used five...

In this article we use the latest cosmological observations, including SNe, BAO, CC and RSD, to reconstruct evolution via Gaussian process. At background level, find consistency with quintom dynamics for different data combinations divide characteristics of dark energy into three categories, which are negative-energy energy, late-dominated oscillating respectively. Considering effect modified gravity on growth matter perturbations, reconstruction results at perturbative level show that only...

Abstract In this article we confront a class of f ( Q ) gravity models with observational data galaxy–galaxy lensing. Specifically, consider containing small quadratic correction when compared general relativity (GR), and quantify by model parameter, α . To derive the constraints, start extracting spherically symmetric solutions, which correspond to deviations from Schwarzschild solution that depends on parameters in twofold way, i.e., renormalized mass new term proportional r −2 Then,...

We employ Hubble data and Gaussian Processes in order to reconstruct the dynamical connection function $f(Q)$ cosmology beyond coincident gauge. In particular, there exist three branches of connections that satisfy torsionless curvatureless conditions, parameterized by a new $\gamma$. express redshift dependence $\gamma$ terms $H(z)$ form parameters, then we it using 55 observation data. Firstly, investigate case where ordinary conservation law holds, function, which is very well described...

Objective The study aimed to understand the current situation of hospital nurses’ patient safety competence, identify potential categories, and analyze distribution characteristics demographic variables in each subgroup. Methods A total 1,996 nursing staff were selected be included this research using a convenience sampling method. questionnaire survey was conducted Chinese version Patient Safety Ability Scale, three dimensions Rating Scale used as explicit for profile analysis. influencing...

Chicoric acid (CA), an active phenolic of Echinacea purpurea (Linn.) Moench, has been demonstrated to exhibit antioxidative, antiviral and immunological activities. A prior study showed that CA is a water-soluble compound with low bioavailability. The current was performed the intestinal absorption mechanism improve its bioavailability using natural biodegradable chitosan. Caco-2 monolayer cell model established characterise mechanisms involved in CA. improvement studied Sprague-Dawley rats...

We perform N-body simulations for $f(T)$ gravity using the ME-Gadget code, in order to investigate first time structure formation process detail. Focusing on power-law model, and considering model-parameter be consistent within 1$\sigma$ with all other cosmological datasets (such as SNIa, BAO, CMB, CC), we show that there are clear observational differences between $\Lambda$CDM cosmology gravity, due modifications brought about latter Hubble function evolution effective $Newton\prime s$...

Abstract. Here we present the experimental design and results from a new mid-Pliocene simulation using latest version of UK’s physical climate model, HadGEM3-GC31-LL, conducted under auspices CMIP6/PMIP4/PlioMIP2. Although two other paleoclimate simulations have been recently run this they both focused on more recent periods within Quaternary therefore is first time UK model has far back in time. The Warm Period, ~3 Ma, particular interest because it represents period when Earth was...

We calculate the quasinormal modes (QNM) frequencies of a test massless scalar field and an electromagnetic around static black holes in $f(T)$ gravity. Focusing on quadratic modifications, which is good approximation for every realistic theory, we first extract spherically symmetric solutions using perturbative method, imposing two ans$\ddot{\text{a}}$tze metric functions, suitably quantify deviation from Schwarzschild solution. Moreover, effective potential, then QNM frequency obtained...

Abstract We investigate the effect of dark matter (DM) halos collisions, namely collisions galaxies and galaxy clusters, through gravitational bremsstrahlung, on stochastic wave background. first calculate signal a single collision event, assuming point masses linear perturbation theory. Then we proceed to calculation energy spectrum collective all in Universe. Concerning DM halo rate, show that it is given by product number density halos, which calculated extended Press–Schechter (EPS)...

We reconstruct the cosmological background evolution under scenario of dynamical dark energy through Gaussian process approach, using latest Dark Energy Spectroscopic Instrument (DESI) baryon acoustic oscillations (BAO) combined with other observations. Our results reveal that reconstructed dark-energy equation-of-state (EoS) parameter $w(z)$ exhibits so-called quintom-B behavior, crossing $-1$ from phantom to quintessence regime as universe expands. investigate what situation this type...