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Dynamics of false vacuum bubbles: beyond the thin shell approximation

- J. Hansen, Dong-il Hwang, Dong-han Yeom
- Physics
- 3 August 2009

We numerically study the dynamics of false vacuum bubbles which are inside an almost flat background; we assumed spherical symmetry and the size of the bubble is smaller than the size of the… Expand

Mass inflation in f(R) gravity ? A conjecture on the resolution of the mass inflation singularity

- Dong-il Hwang, Bum-hoon Lee, Dong-han Yeom
- Physics
- 5 October 2011

We study gravitational collapse of a charged black hole in f(R) gravity using double-null formalism. We require cosmological stability to f(R) models; we used the Starobinsky model and the R+(1/2)cR2… Expand

Is the firewall consistent?: Gedanken experiments on black hole complementarity and firewall proposal

- Dong-il Hwang, Bum-hoon Lee, Dong-han Yeom
- Physics
- 25 October 2012

In this paper, we discuss the black hole complementarity and the firewall proposal at length. Black hole complementarity is inevitable if we assume the following five things: unitarity, entropy-area… Expand

Dynamics of implied volatility surfaces from random matrix theory

- M. Kim, Sun Young Lee, Dong-il Hwang, S. Y. Kim, In Kyu Ko
- Mathematics
- 15 July 2010

We analyze the dynamics of the implied volatility surface of KOSPI 200 futures options from random matrix theory. To extract the informative data, we use random matrix criteria. Implied volatility… Expand

The no-boundary measure in string theory: Applications to moduli stabilization, flux compactification, and cosmic landscape

- Dong-il Hwang, Bum-hoon Lee, H. Sahlmann, Dong-han Yeom
- Physics
- 1 March 2012

We investigate the no-boundary measure in the context of moduli stabilization. To this end, we first show that for exponential potentials, there are no classical histories once the slope exceeds a… Expand

The No-boundary measure in scalar-tensor gravity

- Dong-il Hwang, H. Sahlmann, Dong-han Yeom
- Physics
- 23 July 2011

In this article, we study the no-boundary wave function in scalar-tensor gravity with various potentials for the non-minimally coupled scalar field. Our goal is to calculate probabilities for the… Expand

Euclidean quantum gravity and stochastic inflation

- Dong-il Hwang, Bum-hoon Lee, E. Stewart, Dong-han Yeom, Heeseung Zoe
- Physics
- 31 August 2012

In this paper, we compare dispersions of a scalar field in Euclidean quantum gravity and stochastic inflation. We use Einstein gravity with a minimally coupled scalar field and a quadratic potential.… Expand

The causal structure of dynamical charged black holes

- S. E. Hong, Dong-il Hwang, E. Stewart, Dong-han Yeom
- Physics
- 12 August 2008

We study the causal structure of dynamical charged black holes, with a sufficient number of massless fields, using numerical simulations. Neglecting Hawking radiation, the inner horizon is a null… Expand

No-boundary wave function for two-field inflation

- Dong-il Hwang, Soo A Kim, Dong-han Yeom
- Physics
- 10 April 2014

In this paper, we investigate the no-boundary wave function and the complex-valued instantons for two-field inflation models that have different masses. If there is a relatively massive direction, to… Expand

Toward inflation models compatible with the no-boundary proposal

- Dong-il Hwang, Dong-han Yeom
- Physics
- 27 November 2013

In this paper, we investigate various inflation models in the context of the no-boundary proposal. We propose that a good inflation model should satisfy three conditions: observational constraints,… Expand

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