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- K. Dasgupta, Mohammad M. Sheikh-Jabbari, M. Van Raamsdonk

In this paper, we study the matrix model proposed by Berenstein, Maldacena, and Nastase to describe M-theory on the maximally supersymmetric pp-wave. We show that the model may be derived directly as a discretized theory of supermembranes in the pp-wave background, or alternatively, from the dynamics of D0-branes in type IIA string theory. We consider… (More)

- Juan M . Maldacena, Mohammad M. Sheikh-Jabbari, M. Van Raamsdonk
- 2008

M-theory on the maximally supersymmetric plane wave background of elevendimensional supergravity admits spherical BPS transverse M5-branes with zero light-cone energy. We give direct evidence that the single M5-brane state corresponds to the trivial (X = 0) classical vacuum in the large N limit of the plane wave matrix theory. In particular, we show that… (More)

- Stephon H . S . Alexander, Michael E. Peskin, Mohammad M. Sheikh-Jabbari
- Physical review letters
- 2006

We present a new mechanism for creating the observed cosmic matter-antimatter asymmetry which satisfies all three Sakharov conditions from one common thread, gravitational waves. We generate lepton number through the gravitational anomaly in the lepton number current. The source term comes from elliptically polarized gravity waves that are produced during… (More)

We conjecture that the discrete light-cone quantization (DLCQ) of strings on the maximally supersymmetric type IIB plane-wave background in the sector with J units of lightcone momentum is a supersymmetric 0 + 1 dimensional U(J) gauge theory (quantum mechanics) with PSU(2|2)×PSU(2|2)×U(1) superalgebra. The conjectured Hamiltonian for the plane-wave matrix… (More)

- Masud Chaichian, Mohammad M. Sheikh-Jabbari, Anca Tureanu
- Physical review letters
- 2001

We have calculated the energy levels of the hydrogen atom as well as the Lamb shift within the noncommutative quantum electrodynamics theory. The results show deviations from the usual QED both on the classical and the quantum levels. On both levels, the deviations depend on the parameter of space/space noncommutativity.

Using the supergravity solution of N1 D3-branes probing AN2−1 singularities we study the pp-wave limit of AdS5×S/ZN2 . We show that there are two different pp-wave limits. One is the orbifold of the pp-wave limit of AdS5×S. In this case there is no symmetry enhancement. The other case is the same as the pp-wave limit of AdS5 × S and therefore we again see… (More)

- Mohammad M. Sheikh-Jabbari, M. Torabian
- 2004

The tiny graviton Matrix theory [1] is proposed to describe DLCQ of type IIB string theory on the maximally supersymmetric plane-wave or AdS5 × S background. In this paper we provide further evidence in support of the tiny graviton conjecture by focusing on the zero energy, half BPS configurations of this matrix theory and classify all of them. These vacua… (More)

We argue that Yang-Mills theory on noncommutative torus, expressed in the Fourrier modes, is described by a gauge theory in a usual commutative space, the gauge group being a generalization of the area preserving diffeomorphisms to the noncommutative case. In this way, performing the loop calculations in this gauge theory in the continuum limit, we show… (More)

- Mohsen Alishahiha, Mohammad M. Sheikh-Jabbari
- 2002

Based on the observation that AdS5 × S /Zk orbifolds have a maximal supersymmetric PP-wave limit, the description of strings in PP-waves in terms of N = 2 quiver gauge theories is presented. We consider two different, small and large k, cases and show that the operators in the gauge theory which correspond to stringy excitations are labelled by two… (More)

- A. E. Mosaffa, Omid Saremi, Mohammad M. Sheikh-Jabbari
- 2005

In this paper we elaborate on the correspondence between the quantum Hall system with filling factor equal to one and the N = 4 SYM theory in the 1/2 BPS sector, previously mentioned in the [hep-th/0409174, 0409115]. We show the equivalence of the two in various formulations of the quantum Hall physics. We present an extension of the noncommutative… (More)