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- Kevin Goldstein, Norihiro Iizuka, Sandip P. Trivedi
- 2006

We consider theories with gravity, gauge fields and scalars in four-dimensional asymptotically flat space-time. By studying the equations of motion directly we show that the attractor mechanism can work for non-supersymmetric extremal black holes. Two conditions are sufficient for this, they are conveniently stated in terms of an effective potential… (More)

- Norihiro Iizuka, Sandip P. Trivedi
- 2004

We construct a model of inflation in string theory after carefully taking into account moduli stabilization. The setting is a warped compactification of Type IIB string theory in the presence of D3 and anti-D3-branes. The infla-ton is the position of a D3-brane in the internal space. By suitably adjusting fluxes and the location of symmetrically placed… (More)

- Atish Dabholkar, Norihiro Iizuka, Ashik Iqubal, Masaki Shigemori
- Physical review letters
- 2006

We examine certain two-charge supersymmetric states with spin in five-dimensional string theories which can be viewed as small black rings when the gravitational coupling is large. Using the 4D-5D connection, these small black rings correspond to four-dimensional nonspinning small black holes. Using this correspondence, we compute the degeneracy of the… (More)

The " small " black ring in 5D obtained by giving angular momentum to the D1-D5 system compactified on S 1 ×K3 is a very interesting object in the sense that it does not have an event horizon in the supergravity limit whereas it microscopically has a finite entropy. The microscopic origin of this small black ring can be analyzed in detail since it is… (More)

We use a 0-brane to probe a ten-dimensional near-extremal black hole with N units of 0-brane charge. We work directly in the dual strongly-coupled quantum mechanics, using mean-field methods to describe the black hole background non-perturbatively. We obtain the distribution of W boson masses, and find a clear separation between light and heavy degrees of… (More)

Certain supersymmetric elementary string states with spin can be viewed as small black rings whose horizon has the topology of S 1 × S d−3 in a d-dimensional string theory. By analyzing the singular black ring solution in the supergravity approximation, and using various symmetries of the α ′ corrected effective action we argue that the… (More)

We present a matrix model which is intended as a toy model of the gauge dual of an AdS black hole. In particular, it captures the key property that at infiniteN correlators decay to zero on long time scales, while at finite N this cannot happen. The model consists of a harmonic oscillator in the adjoint which acts as a heat bath for a particle in the… (More)

- Norihiro Iizuka
- 2002

We study the back-reaction of large-N D0-brane charge on the maximally supersymmetric pp-wave background. This gives the type IIA geometry on which string theory is dual to the BMN Matrix model. We identify the energy scales where perturbation theory in this Matrix model is valid. We derive the supermembrane action on a general pp-wave background and… (More)

We propose that stretched horizons can be described in terms of a gas of non-interacting quasiparticles. The quasiparticles are unstable, with a lifetime set by the imaginary part of the lowest quasinormal mode frequency. If the horizon arises from an AdS/CFT style duality the quasiparticles are also the effective low-energy degrees of freedom of the… (More)

We study various matrix models with a charge-charge interaction as toy models of the gauge dual of the AdS black hole. These models show a continuous spectrum and power-law decay of correlators at late time and infinite N , implying information loss in this limit. At finite N , the spectrum is discrete and correlators have recurrences, so there is no… (More)