141 citations · 1.5k across the 77 of their papers we have counts for
77 papers
Spontaneous scalarization of Bardeen black holes
Lina Zhang, Qiyuan Pan, Yun Soo Myung +1
We study the spontaneous scalarization of Bardeen black holes, whose tachyonic instability triggers the formation of scalarized charged black holes (SCBHs). In this case, we find i…
Existence of nonlinearly scalarized black holes in Einstein-scalar-Gauss-Bonnet theory with polynomial couplings
De-Cheng Zou, Xu Yang, Meng-Yun Lai +5
Nonlinearly scalarized black holes are investigated in Einstein-scalar-Gauss-Bonnet (EsGB) theory with polynomial coupling functions satisfying , where $ζ'(ϕ) =…
Shadow bound of black holes with dark matter halo
Yun Soo Myung
We investigate the shadow cast of black holes immersed in a dark matter halo. We use the M87* shadow data obtained by the EHT collaboration to constrain two parameters () of d…
Double instability of Schwarzschild black holes in Einstein-Weyl-scalar theory
Yun Soo Myung
We study the stability of Schwarzschild black hole in Einstein-Weyl-scalar (EWS) theory with a quadratic scalar coupling to the Weyl term. Its linearized theory admits the Lichnero…
Quasibound states of massive scalar around the Kerr black hole
Yun Soo Myung
In this work, we obtain quasibound states of a massive scalar around the Kerr black hole. A massive scalar propagating around the Kerr black hole induces the far-region potential w…
Spin-Charge induced spontaneous scalarization of Kerr-Newman black holes
Meng-Yun Lai, Yun Soo Myung, Rui-Hong Yue +1
We investigate the tachyonic instability of Kerr-Newman (KN) black holes in the Einstein-Maxwell-scalar (EMS) theory with a positive coupling parameter . This corresponds to exp…
Conditions for superradiant instability of the Kerr-Newman black holes
Yun Soo Myung
We find two conditions for superradiant instability of Kerr-Newman black holes under a charged massive scalar perturbation by analyzing asymptotic scalar potential and far-region w…
Slowly rotating black holes and their scalarization
Yun Soo Myung, De-Cheng Zou
We study scalarization of slowly rotating black holes in the Einstein-scalar-Gauss-Bonnet (GB)-Chern-Simons (CS) theory. In the slow rotation approximation of with rotation…
Radial perturbations of the scalarized black holes in Einstein-Maxwell-conformally coupled scalar theory
De-Cheng Zou, Yun Soo Myung
We perform the stability analysis for the scalarized charged black holes obtained from Einstein-Maxwell-conformally coupled scalar (EMCS) theory by employing the radial perturbatio…
Scalar hairy black holes in Einstein-Maxwell-conformally coupled scalar theory
De-Cheng Zou, Yun Soo Myung
We obtain scalar hairy black holes from Einstein-Maxwell-conformally coupled scalar (EMCS) theory with the scalar coupling parameter to the Maxwell term. In case of , the…
Quasinormal modes of scalarized black holes in the Einstein-Maxwell-Scalar theory
Yun Soo Myung, De-Cheng Zou
We perform the stability analysis on scalarized charged black holes in the Einstein-Maxwell-Scalar (EMS) theory by computing quasinormal mode spectrum. It is noted that the appeara…
Mass-induced instability of SAdS black hole in Einstein-Ricci cubic gravity
Yun Soo Myung
We perform the stability analysis of Schwarzschild-AdS (SAdS) black hole in the Einstein-Ricci cubic gravity. It shows that the Ricci tensor perturbations exhibit unstable modes fo…
Renormalizability and Newtonian potential in scale-invariant gravity
Yun Soo Myung
There is a conjecture that renormalizable higher-derivative gravity has a finite classical potential at the origin. In this work we show clearly that the scale-invariant gravity (S…
Entropy of black hole in the infinite-derivative gravity
Yun Soo Myung
We compute the Wald entropy of the Schwarzschild black hole in the ghost-free, infinite derivative gravity that is quadratic in curvature. This is not given purely by the area law…
Comment on Quantum Massive Conformal Gravity
Yun Soo Myung
In a recent paper in EPJC March 2016, Faria has shown that quantum massive conformal gravity is renormalizable but has ghost states. We comment this paper on the aspect of renormal…
Inflaton decay and reheating in nonminimal derivative coupling
Yun Soo Myung, Taeyoon Moon
We investigate the inflaton decay and reheating period after the end of inflation in the non-minimal derivative coupling (NDC) model with chaotic potential. In general, this model…
Einstein-singleton theory and its power spectra in de Sitter inflation
Yun Soo Myung, Taeyoon Moon, Young-Jai Park
We study the Einstein-singleton theory during de Sitter inflation since it provides a way of degenerate fourth-order scalar theory. We obtain an exact solution expressed in terms o…
Phase transitions of the BTZ black hole in new massive gravity
Yun Soo Myung
We investigate thermodynamics of the BTZ black hole in new massive gravity explicitly. For with the mass parameter of fourth-order terms and AdS…
Scale-invariant power spectra from a Weyl-invariant scalar-tensor theory
Yun Soo Myung, Young-Jai Park
We obtain scale-invariant scalar and tensor power spectra from a Weyl-invariant scalar-tensor theory in de Sitter spacetime. This implies that the Weyl-invariance guarantees to imp…
Revisiting slow-roll inflation in nonminimal derivative coupling with potentials
Yun Soo Myung, Taeyoon Moon, Bum-Hoon Lee
We investigate the slow-roll inflation in the nonminimal derivative coupling (NDC) model with exponential, quadric, and quartic potentials. It was known that this model provides an…
Scale-invariant scalar spectrum from the nonminimal derivative coupling with fourth-order term
Yun Soo Myung, Taeyoon Moon
An exactly scale-invariant spectrum of scalar perturbation generated during de Sitter spacetime is found from the gravity model of the nonminimal derivative coupling with fourth-or…
Scale-invariant tensor spectrum from conformal gravity
Yun Soo Myung, Taeyoon Moon
We study cosmological tensor perturbations generated during de Sitter inflation in the conformal gravity with mass parameter . It turns out that tensor power spectrum is…
Primordial gravitational waves from conformal gravity
Yun Soo Myung, Taeyoon Moon
We investigate the evolution of cosmological perturbations generated during de Sitter inflation in the conformal gravity. Primordial gravitational waves are composed of vector and…
Cosmological singleton gravity theory and dS/LCFT correspondence
Yun Soo Myung, Taeyoon Moon
We study the evolution of cosmological perturbations generated during de Sitter inflation in the singleton gravity theory. This theory is composed of a dipole ghost pair in additio…