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Violation of non-Gaussianity consistency relation in a single-field inflationary model

- M. H. Namjoo, H. Firouzjahi, M. Sasaki
- Physics
- 13 October 2012

In this paper we present a simple, toy model of single-field inflation in which the standard non-Gaussianity consistency condition is violated. In this model the curvature perturbations on… Expand

Warped brane worlds in six dimensional supergravity

- Y. Aghababaie, C. Burgess,
+5 authors I. Zavala - Physics
- 8 August 2003

We present warped compactification solutions of six-dimensional su- pergravity, which are generalizations of the Randall-Sundrum (RS) warped brane world to codimension two and to a supersymmetric… Expand

The (p,q) string tension in a warped deformed conifold

- H. Firouzjahi, L. Leblond, S. Tye
- Physics
- 21 March 2006

We find the tension spectrum of the bound states of p fundamental strings and q D-strings at the bottom of a warped deformed conifold. We show that it can be obtained from a D3-brane wrapping a… Expand

Uplifting and inflation with D3 branes

- C. Burgess, J. Cline, K. Dasgupta, H. Firouzjahi
- Physics
- 30 October 2006

Back-reaction effects can modify the dynamics of mobile D3 branes moving within type IIB vacua, in a way which has recently become calculable. We identify some of the ways these effects can alter… Expand

Brane Inflation and Cosmic String Tension in Superstring Theory

- H. Firouzjahi, S. Tye
- Physics
- 13 January 2005

In a simple reanalysis of the KKLMMT scenario, we argue that the slow roll condition in the -brane inflationary scenario in superstring theory requires no more than a moderate tuning. The cosmic… Expand

The Shape of gravity in a warped deformed conifold

- H. Firouzjahi, S. Tye
- Physics
- 6 December 2005

We study the spectrum of the gravitational modes in Minkowski spacetime due to a 6-dimensional warped deformed conifold, i.e., a warped throat, in superstring theory. After identifying the zero mode… Expand

Instabilities in Mimetic Matter Perturbations

- H. Firouzjahi, M. Gorji, S. A. H. Mansoori
- Physics
- 8 March 2017

We study cosmological perturbations in mimetic matter scenario with a general higher derivative function. We calculate the quadratic action and show that both the kinetic term and the gradient term… Expand

Microwave Background Correlations from Dipole Anisotropy Modulation

- S. Aiola, Bingjie Wang, A. Kosowsky, T. Kahniashvili, H. Firouzjahi
- Physics
- 14 June 2015

Full-sky maps of the cosmic microwave background temperature reveal a 7% asymmetry of fluctuation power between two halves of the sky. A common phenomenological model for this asymmetry is an overall… Expand

In-in and δN calculations of the bispectrum from non-attractor single-field inflation

- Xingang Chen, H. Firouzjahi, E. Komatsu, M. H. Namjoo, M. Sasaki
- Physics
- 24 August 2013

In non-attractor single-field inflation models producing a scale-invariant power spectrum, the curvature perturbation on super-horizon scales grows as ∝a3. This is so far the only known class of… Expand

Spontaneous creation of inflationary universes and the cosmic landscape

- H. Firouzjahi, Saswat Sarangi, S. Tye
- Physics
- 14 June 2004

We study some gravitational instanton solutions that offer a natural realization of the spontaneous creation of inflationary universes in the brane world context in string theory. Decoherence due to… Expand

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