Xiao Yan Chew
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View article: Insights in <i>f</i> ( <i>Q</i> ) cosmology: the relevance of the connection
Insights in <i>f</i> ( <i>Q</i> ) cosmology: the relevance of the connection Open
We explore the role of the affine connection in f ( Q ) gravity, a modified theory where gravity is governed by non-metricity within the symmetric teleparallel framework. Although the connection is constrained to be flat and torsionless, i…
View article: Dynamics of Bronnikov-Ellis wormhole with double-null simulation
Dynamics of Bronnikov-Ellis wormhole with double-null simulation Open
We investigate the dynamical collapse of Bronnikov-Ellis (BE) wormhole using the double-null formalism, where its throat is characterized by the coincidence of two curves r ,u = 0 and r ,v = 0. The emission of two ingoing pulses: normal sc…
View article: Geodesic motion of test particles around the scalar hairy black holes with asymmetric vacua
Geodesic motion of test particles around the scalar hairy black holes with asymmetric vacua Open
An asymptotically flat hairy black hole (HBH) can exhibit distinct characteristics when compared to the Schwarzschild black hole, due to the evasion of no-hair theorem by minimally coupling the Einstein gravity with a scalar potential whic…
View article: Oscillations of the black hole photon ring as a probe of ultralight dilaton fields
Oscillations of the black hole photon ring as a probe of ultralight dilaton fields Open
Advancements of very long baseline interferometry (VLBI) have facilitated unprecedented probing of superradiant phenomena in the vicinities of supermassive black holes (SMBHs), establishing an ideal laboratory to detect ultralight bosons b…
View article: Shadow of the Scalar Hairy Black Hole with Inverted Higgs Potential
Shadow of the Scalar Hairy Black Hole with Inverted Higgs Potential Open
We study the imaging of a hairy black hole (HBH) in the Einstein-Klein-Gordon theory, where Einstein gravity is minimally coupled to a scalar potential $V(ϕ)=-Λϕ^4 + μϕ^2$ with $Λ$ and $μ$ are constants. As a consequence, a nontrivial scal…
View article: Geodesic Motion of Test Particles around the Scalar Hairy Black Holes with Asymmetric Vacua
Geodesic Motion of Test Particles around the Scalar Hairy Black Holes with Asymmetric Vacua Open
An asymptotically flat hairy black hole (HBH) can exhibit distinct characteristics when compared to the Schwarzschild black hole, due to the evasion of no-hair theorem by minimally coupling the Einstein gravity with a scalar potential whic…
View article: Can a naked singularity be formed during the gravitational collapse of a Janis-Newman-Winicour solution?
Can a naked singularity be formed during the gravitational collapse of a Janis-Newman-Winicour solution? Open
The Janis-Newman-Winicour (JNW) spacetime possesses a naked singularity, although it represents an exact particle-like solution to the Einstein-Klein-Gordon theory with a massless scalar field. Here, we investigate the possible formation o…
View article: Simplest model of a scalarized black hole in the Einstein-Klein-Gordon theory
Simplest model of a scalarized black hole in the Einstein-Klein-Gordon theory Open
We investigate scalarized black holes in the Einstein-minimally coupled\nscalar theory with a negative potential $V(\\phi)=-\\alpha^2\\phi^6$. The\ntachyonic instability is absent from analyzing the linearized scalar equation,\nwhich could…
View article: Gravitating Scalarons with Inverted Higgs Potential
Gravitating Scalarons with Inverted Higgs Potential Open
Previously, a class of regular and asymptotically flat gravitating scalar solitons (scalarons) has been constructed in the Einstein–Klein–Gordon (EKG) theory by adopting a phantom field with Higgs-like potential where the kinetic term has …
View article: Hairy Reissner-Nordstrom Black Holes with Asymmetric Vacua
Hairy Reissner-Nordstrom Black Holes with Asymmetric Vacua Open
We minimally coupled a scalar potential $V(ϕ)$ with asymmetric vacua to the Einstein gravity to numerically construct the hairy Reissner-Nordstrom black hole (RNBH) as a direct generalization of RNBHs to possess scalar hair. By fixing the …
View article: Yang-Mills instantons as the end point of black hole evaporation
Yang-Mills instantons as the end point of black hole evaporation Open
Non-perturbative contributions of the Euclidean path integral are important to understand the information loss paradox. In this paper, we revisit the Yang-Mills instantons in the Einstein-Yang-Mills theory. There exists a globally regular …
View article: Insights and guidelines on the Cauchy horizon theorems
Insights and guidelines on the Cauchy horizon theorems Open
Recently there has been progress to resolve the issue regarding the non-existence of the Cauchy horizon inside the static, charged, and spherically symmetric black holes. However, when we generically extend the black holes' spacetime, they…
View article: Scalar Hairy Black Holes with Inverted Mexican Hat Potential
Scalar Hairy Black Holes with Inverted Mexican Hat Potential Open
We numerically construct the asymptotically flat solutions of hairy black holes supported by a symmetric inverted Mexican hat potential with a local minimum and two degenerate global maxima of a real scalar field that contains a quartic se…
View article: Polar modes and isospectrality of Ellis-Bronnikov wormholes
Polar modes and isospectrality of Ellis-Bronnikov wormholes Open
We consider polar perturbations of static Ellis-Bronnikov wormholes and derive the coupled set of perturbation equations for the gravitational and the scalar field. For massless wormholes the perturbations decouple, and we obtain two ident…
View article: Properties of Scalar Hairy Black Holes and Scalarons with Asymmetric Potential
Properties of Scalar Hairy Black Holes and Scalarons with Asymmetric Potential Open
In this paper we study the properties of black holes and scalarons in Einstein gravity when it is minimally coupled to a scalar field $ϕ$ with an asymmetric potential $V(ϕ)$, constructed in [Phys. Rev. D \textbf{73} (2006), 084002] a few d…
View article: Non-Abelian wormholes threaded by a Yang-Mills-Higgs field beyond the BPS limit
Non-Abelian wormholes threaded by a Yang-Mills-Higgs field beyond the BPS limit Open
We construct numerically the symmetric non-Abelian wormholes which are\nsupported by a phantom field in the Einstein-Yang-Mills-Higgs theory beyond\nBogomol'nyi-Prasad-Sommerfield (BPS) limit where the Higgs self-interaction\nconstant $\\l…
View article: Traversable wormhole in Einstein 3-form theory with self-interacting potential
Traversable wormhole in Einstein 3-form theory with self-interacting potential Open
We numerically construct a symmetric wormhole solution in pure Einstein gravity supported by a massive $3$-form field with a potential that contains a quartic self-interaction term. The wormhole spacetimes have only a single throat and the…
View article: Neutron-Induced Nuclear Cross-Sections Study for Plasma Facing Materials via Machine Learning: Molybdenum Isotopes
Neutron-Induced Nuclear Cross-Sections Study for Plasma Facing Materials via Machine Learning: Molybdenum Isotopes Open
In this work, we apply a machine learning algorithm to the regression analysis of the nuclear cross-section of neutron-induced nuclear reactions of molybdenum isotopes, 92Mo at incident neutron energy around 14 MeV. The machine learning al…
View article: Generation of Proton- and Alpha-Induced Nuclear Cross-Section Data via Random Forest Algorithm: Production of Radionuclide 111In
Generation of Proton- and Alpha-Induced Nuclear Cross-Section Data via Random Forest Algorithm: Production of Radionuclide 111In Open
We investigated the generation of proton- and alpha-induced nuclear cross-section data in the production of Indium-111 (111In) for application in nuclear medicine. Here, we are interested in three reaction channels, which are 109Ag (α, 2n)…
View article: Non-Abelian wormholes threaded by a Yang-Mills-Higgs field in the BPS limit
Non-Abelian wormholes threaded by a Yang-Mills-Higgs field in the BPS limit Open
In the Bogomol'nyi-Prasad-Sommerfield (BPS) limit of\nEinstein-Yang-Mills-Higgs theory, we construct numerically a non-Abelian\nwormhole supported by a phantom field. The probe limit is the Yang-Mills-Higgs\nfield in the background of Elli…
View article: Interior volume of Kerr-AdS black holes
Interior volume of Kerr-AdS black holes Open
The interior volume of black holes as defined by Christodoulou and Rovelli exhibits many surprising features. For example, it increases with time, even under Hawking evaporation. For some black holes, the interior volume is not even a mono…
View article: Euclidean wormholes in Gauss-Bonnet-dilaton gravity
Euclidean wormholes in Gauss-Bonnet-dilaton gravity Open
We investigate Euclidean wormholes in Gauss-Bonnet-dilaton gravity to explain the creation of the universe from nothing. We considered two types of dilaton couplings (i.e., the string-inspired model and the Gaussian model) and we obtained …
View article: Rotating wormhole solutions with a complex phantom scalar field
Rotating wormhole solutions with a complex phantom scalar field Open
We consider rotating wormhole solutions supported by a complex phantom scalar field with a quartic self-interaction, where the phantom field induces the rotation of the spacetime. The solutions are regular and asymptotically flat. A subset…
View article: Scalar and axial quasinormal modes of massive static phantom wormholes
Scalar and axial quasinormal modes of massive static phantom wormholes Open
We study the quasinormal modes for scalar, axial and radial perturbations of massive static spherically symmetric wormholes supported by a phantom scalar field, calculating the modes directly and employing the WKB approximation. The spectr…
View article: Spinning wormholes in scalar-tensor theory
Spinning wormholes in scalar-tensor theory Open
We consider spinning generalizations of the Ellis wormhole in scalar-tensor theory. Analogous to other compact objects these wormholes can carry a non-trivial scalarization. We determine the domain of existence of the scalarized wormholes …
View article: Geometry of spinning Ellis wormholes
Geometry of spinning Ellis wormholes Open
We give a detailed account of the properties of spinning Ellis wormholes, supported by a phantom field. The general set of solutions depends on three parameters, associated with the size of the throat, the rotation and the symmetry of the …