1,042 research outputs found
Rotating black holes in semiclassical gravity
We present analytic stationary and axially-symmetric black hole solutions to
the semiclassical Einstein equations that are sourced by the trace anomaly. We
also find that the same spacetime geometry satisfies the field equations of a
subset of Horndeski theories featuring a conformally coupled scalar field. We
explore various properties of these solutions, and determine the domain of
existence of black holes. These black holes display distinctive features, such
as non-circularity, a non-spherically symmetric event horizon and violations of
the Kerr bound.Comment: 5 pages, 2 figures. v2: references added, expanded discussio
A new approach and code for spinning black holes in modified gravity
We discuss and implement a spectral method approach to computing stationary
and axisymmetric black hole solutions and their properties in modified theories
of gravity. The resulting code is written in the Julia language and is
transparent and easily adapted to new settings. We test the code on both
general relativity and on Einstein-Scalar-Gauss-Bonnet gravity. It is accurate
and fast, converging on a spinning solution in these theories with tiny errors
( in most cases) in a matter of seconds.Comment: 40 pages, 14 figures. GitHub repository:
https://github.com/pgsfernandes/SpinningBlackHoles.jl ; v2: added references,
accepted for publication in Classical and Quantum Gravit
Spinning Black Holes with Axion Hair
In this work we construct and analyse non-perturbative stationary and
axially-symmetric black hole solutions in General Relativity coupled to an
electromagnetic and an axion field. The axion field is coupled to the
electromagnetic field, which leads to hairy solutions in the presence of an
electric charge and rotation. We investigate the existence and characteristics
of these solutions for different values of the spin, charge and coupling
constant. Our analysis shows the presence of violations of the Kerr-Newman
bound, solutions with large positive and negative values of the gyromagnetic
ratio, and the existence of multiple branches of solutions with distinct
properties, demonstrating that black hole uniqueness does not hold in this
scenario. The code used in this study is publicly available, providing a
valuable tool for further research on this model.Comment: 17 pages, 10 figure
Exploring the Small Mass Limit of Stationary Black Holes in Theories with Gauss-Bonnet Terms
In this work we examine the small mass limit of black holes, with and without
spin, in theories with a scalar field non-minimally coupled to a Gauss-Bonnet
term. First, we provide an analytical example for a theory where a static
closed-form solution with a small mass limit is known, and later use analytical
and numerical techniques to explore this limit in standard scalar-Gauss-Bonnet
theories with dilatonic, linear and quadratic couplings. In most cases, we find
an inner singularity that overlaps with the event horizon of the static black
hole as the small mass limit is reached. Moreover, since solutions in this
limit possess a non-vanishing Hawking temperature, a naked singularity is
expected to be reached through evaporation, raising questions concerning the
consistency of these theories altogether. On the other hand, we provide for the
first time an example of a coupling where the small mass limit is never
reached, thus preferred from the point of view of cosmic censorship. Finally,
we consider black holes with spin and numerically investigate how this changes
the picture, using these to place the tightest upper bounds to date on the
coupling constant for the dilatonic and linear theories, with
km.Comment: 18 pages, 8 figure
Biomechanical properties of breast tissue, a state-of-the-art review
This paper reviews the existing literature on the tests used to determine the mechanical properties of women breast tissues (fat, glandular and tumour tissue) as well as the different values of these properties. The knowledge of the mechanical properties of breast tissue is important for cancer detection, study and planning of surgical procedures such as surgical breast reconstruction using pre-surgical methods and improving the interpretation of clinical tests. Based on the data collected from the analysed studies, some important conclusions were achieved: (1) the Young’s modulus of breast tissues is highly dependent on the tissue preload compression level, and (2) the results of these studies clearly indicate a wide variation in moduli not only among different types of tissue but also within each type of tissue. These differences were most evident in normal fat and fibroglandular tissues
Charged black holes with axionic-type couplings: classes of solutions and dynamical scalarization
We consider an augmented Einstein-Maxwell-scalar model including an axionic-type coupling between
the scalar and electromagnetic field. We study dyonic black hole solutions in this model. For the canonical
axionic coupling emerging from high energy physics, all charged black holes have axion hair. We present
their domain of existence and investigate some physical properties. For other axionic-type couplings,
two classes of black hole solutions may coexist in the model: scalar-free Reissner-Nordström black holes
and scalarized black holes. We show that in some region of the parameter space the scalar-free solutions
are unstable. Then, there is nonuniqueness since new scalarized black hole solutions with the same global
charges, which are entropically preferred over the scalar-free solutions and, moreover, emerge dynamically
from the instability of the former, also exist.publishe
Shadows and properties of spin-induced scalarized black holes with and without a Ricci coupling
In this work, we explore the properties and shadows of spin-induced scalarized black holes, as well as investigate how a Ricci coupling influences them. Our findings reveal significant deviations from the Kerr metric in terms of the location and geodesic frequencies of the innermost stable circular orbit and light ring, with the former exhibiting more pronounced disparities. The shadows of scalarized black holes exhibit relatively minor deviations when compared to those of Kerr black holes with the same mass and spin. Overall, the presence of a Ricci coupling is observed to mitigate deviations from the Kerr metric
Tensile strength essay comparing three different platelet-rich fibrin membranes (L-PRF, A-PRF, and A-PRF plus): a mechanical and structural in vitro evaluation
Predictable outcomes intended by the application of PRF (platelet-rich fibrin) derivative membranes have created a lack of consideration for their consistency and functional integrity. This study aimed to compare the mechanical properties through tensile strength and analyze the structural organization among the membranes produced by L-PRF (leukocyte platelet-rich fibrin), A-PRF (advanced platelet-rich fibrin), and A-PRF+ (advanced platelet-rich fibrin plus) (original protocols) that varied in centrifugation speed and time. L-PRF (n = 12), A-PRF (n = 19), and A-PRF+ (n = 13) membranes were submitted to a traction test, evaluating the maximum and average traction. For maximum traction, 0.0020, 0.0022, and 0.0010 N·mm−2 were obtained for A-PRF, A-PRF+, and L-PRF, respectively; regarding the average resistance to traction, 0.0012, 0.0015, and 0.006 N·mm−2 were obtained, respectively (A-PRF+ > A-PRF > L-PRF). For all groups studied, significant results were found. In the surface morphology observations through SEM, the L-PRF matrix showed a highly compact surface with thick fibers present within interfibrous areas with the apparent destruction of red blood cells and leukocytes. The A-PRF protocol showed a dense matrix composed of thin and elongated fibers that seemed to follow a preferential and orientated direction in which the platelets were well-adhered. Porosity was also evident with a large diameter of the interfibrous spaces whereas A-PRF+ was the most porous platelet concentrate with the greatest fiber abundance and cell preservation. Thus, this study concluded that A-PRF+ produced membranes with significant and higher maximum traction results, indicating a better viscoelastic strength when stretched by two opposing forces.info:eu-repo/semantics/publishedVersio
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