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- I Y Park, C N Pope, A Sadrzadeh
- 2001

We obtain new results for consistent braneworld Kaluza-Klein reductions, showing how we can derive four-dimensional N = 2 gauged supergravity " localised on the AdS 4 brane " as an exact embedding in five-dimensional N = 4 gauged supergravity. Similarly, we obtain five-dimensional N = 2 gauged supergravity localised on an AdS 5 brane as a consistent… (More)

- M Cvetič, H Lü, C N Pope, A Sadrzadeh, T A Tran
- 2000

Type IIB supergravity can be consistently truncated to the metric and the self-dual 5-form. We obtain the complete non-linear Kaluza-Klein S 5 reduction Ansatz for this theory, giving rise to gravity coupled to the fifteen Yang-Mills gauge fields of SO(6) and the twenty scalars of the coset SL(6, IR)/SO(6). This provides a consistent embedding of this… (More)

- Evgeni S Penev, Somnath Bhowmick, Arta Sadrzadeh, Boris I Yakobson
- Nano letters
- 2012

The structural stability and diversity of elemental boron layers are evaluated by treating them as pseudoalloy B(1-x)[hexagon](x), where [hexagon] is a vacancy in the close-packed triangular B lattice. This approach allows for an elegant use of the cluster expansion method in combination with first-principles density-functional theory calculations, leading… (More)

- M Cvetič, H Lü, C N Pope, A Sadrzadeh, T A Tran
- 2000

We construct a consistent reduction of type IIA supergravity on S 3 , leading to a maximal gauged supergravity in seven dimensions with the full set of massless SO(4) Yang-Mills fields. We do this by starting with the known S 4 reduction of eleven-dimensional super-gravity, and showing that it is possible to take a singular limit of the resulting standard… (More)

- Nevill Gonzalez Szwacki, Arta Sadrzadeh, Boris I Yakobson
- Physical review letters
- 2007

The geometry, electronic, and structural properties of an unusually stable boron cage made of 80 boron atoms are studied, using ab initio calculations. The shape of this cluster is very similar to that of the well-known C60 fullerene, but in the B80 case, there is an additional atom in the center of each hexagon. The resulting cage preserves the Ih… (More)

- C N Pope, A Sadrzadeh, S R Scuro
- 1999

The usual T-duality that relates the type IIA and IIB theories compactified on circles of inversely-related radii does not operate if the dimensional reduction is performed on the time direction rather than a spatial one. This observation led to the recent proposal that there might exist two further ten-dimensional theories, namely type IIA * and type IIB *… (More)

- Abhishek K Singh, Arta Sadrzadeh, Boris I Yakobson
- Nano letters
- 2008

We investigate the properties of nanotubes obtained from recently described boron alpha-sheet, using density functional theory. Computations confirm their high stability and identify mechanical stiffness parameters. This allows one to further analyze the basic vibrations, including the radial breathing mode Raman frequency, fRBM = 210(nm/ d) cm (-1).… (More)

We investigate the properties of nanotubes obtained from recently described boron r-sheet, using density functional theory. Computations confirm their high stability and identify mechanical stiffness parameters. This allows one to further analyze the basic vibrations, including the radial breathing mode Raman frequency, f RBM) 210(nm/d) cm-1. Careful… (More)

- I Y Park, A Sadrzadeh, T A Tran
- 2001

A consistent truncation of IIB on S 5 has been obtained in the sector of the metric and the 4-form potential. The ansatz contains 20 scalars and all 15 gauge fields of N = 8 gauged supergravity in five dimensions. With this fully non-linear ansatz, the calculations for n-point correlators of super Yang-Mills (SYM) theory via AdS/CFT are simpler than those… (More)

- Arta Sadrzadeh, Olga V Pupysheva, Abhishek K Singh, Boris I Yakobson
- The journal of physical chemistry. A
- 2008

Using ab initio calculations, we analyze electronic structure and vibrational modes of the boron fullerene B(80), a stable, spherical cage similar in shape to the well-known C(60). There exist several isomers, lying close in structure and energy, with total energy difference within approximately 30 meV. We present detailed analysis of their electronic… (More)