Moduli destabilization via gravitational collapse

Hwang, Dong-il; Pedro, Francisco G.; Yeom, Dong-han

doi:10.1007/jhep09(2013)159

Cited by 6 publications

(4 citation statements)

References 34 publications

(71 reference statements)

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“…In this paper, we study a gravitational collapse of f (R) dark energy models that contain cusp singularities, by using numerical simulations. Especially we use double-null formalism [15] to study the formation of charged black holes [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] where this can be applied for cosmology [31][32][33] as well as scalar-tensor models [34][35][36][37][38][39][40][41][42][43]. We first show that we can cure the cusp singularity problem by adding a ∼ R 2 term; in addition, we show that there can be a higher curvature region.…”

Section: Jcap10(2015)022mentioning

confidence: 96%

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Cusp singularities in f(R) gravity:prosandcons

Chen

Yeom

2015

J. Cosmol. Astropart. Phys.

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We investigate cusp singularities in f (R) gravity, especially for Starobinsky and Hu-Sawicki dark energy models. We illustrate that, by using double-null numerical simulations, a cusp singularity can be triggered by gravitational collapses. This singularity can be cured by adding a quadratic term, but this causes a Ricci scalar bump that can be observed by an observer outside the event horizon.Comparing with cosmological parameters, it seems that it would be difficult to see super-Planckian effects by astrophysical experiments. On the other hand, at once there exists a cusp singularity, it can be a mechanism to realize a horizon scale curvature singularity that can be interpreted by a firewall. *

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Section: Jcap10(2015)022mentioning

confidence: 96%

“…In order to induce a gravitational collapse, one convenient way is to introduce a gauge field, A µ , that couples to a matter field, for which we consider a complex scalar field φ. To implement this, we use the following model [16][17][18][19][40][41][42][43]:…”

Section: Jcap10(2015)022mentioning

confidence: 99%

Cusp singularities in f(R) gravity:prosandcons

Chen

Yeom

2015

J. Cosmol. Astropart. Phys.

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“…1) and present every equations using this metric ansatz. To simplify and present every equations by first order differentials, we define the following variables [31][32][33][34][35][36][37][38][39][40][41][42]: the metric function α, the radial function r, the Brans-Dicke field Φ and a complex scalar field s ≡ √ 4πφ, and define…”

Section: Jcap09(2015)019mentioning

confidence: 99%

“…where R is the Ricci scalar, Φ is the Brans-Dicke field that can be interpreted as a dilaton field (if ω = −1, while there can be other string-inspired values for ω [20]), and F is the two-form field that can couple to a complex scalar field. In order to investigate dynamical properties, we implemented a numerical formalism, the double-null formalism [21], and people have obtained various results [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Especially, in the authors' first paper, we mainly focused to see the causal structures and responses of the Brans-Dicke field Φ.…”

Section: Introductionmentioning

confidence: 99%

Charged black holes in string-inspired gravity II. Mass inflation and dependence on parameters and potentials

Hansen

Yeom²

2015

J. Cosmol. Astropart. Phys.

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We investigate the relation between the existence of mass inflation and model parameters of stringinspired gravity models. In order to cover various models, we investigate a Brans-Dicke theory that is coupled to a U (1) gauge field. By tuning a model parameter that decides the coupling between the Brans-Dicke field and the electromagnetic field, we can make both of models such that the Brans-Dicke field is biased toward strong or weak coupling directions after gravitational collapses.We observe that as long as the Brans-Dicke field is biased toward any (strong or weak) directions,

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Charged black holes in string-inspired gravity. I. Causal structures and responses of the Brans-Dicke field

Hansen

Yeom

2014

J. High Energ. Phys.

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Abstract:We investigate gravitational collapses of charged black holes in string-inspired gravity models, including dilaton gravity and braneworld model, as well as f (R) gravity and the ghost limit. If we turn on gauge coupling, the causal structures and the responses of the Brans-Dicke field depend on the coupling between the charged matter and the BransDicke field. For Type IIA inspired models, a Cauchy horizon exists, while there is no Cauchy horizon for Type I or Heterotic inspired models. For Type IIA inspired models, the no-hair theorem is satisfied asymptotically, while it is biased to the weak coupling limit for Type I or Heterotic inspired models. Apart from string theory, we find that in the ghost limit, a gravitational collapse can induce inflation by itself and create one-way traversable wormholes without the need of other special initial conditions.

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Moduli destabilization via gravitational collapse

Cited by 6 publications

References 34 publications

Cusp singularities in f(R) gravity:prosandcons

Cusp singularities in f(R) gravity:prosandcons

Charged black holes in string-inspired gravity II. Mass inflation and dependence on parameters and potentials

Charged black holes in string-inspired gravity. I. Causal structures and responses of the Brans-Dicke field

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