Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-05-19
JHEP 0205:056,2002
Physics
High Energy Physics
High Energy Physics - Theory
Latex file, 40+16 pages, 2 eps figures; v2: refs added; v3: correction to energy shift calculation; v4: small corrections
Scientific paper
10.1088/1126-6708/2002/05/056
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 expanding the model about each of its classical supersymmetric vacua and note that for large values of the mass parameter \mu, interaction terms are suppressed by powers of 1/mu, so that the model may be studied in perturbation theory. We compute the exact spectrum about each of the vacua in the large \mu limit and find the complete (infinite) set of BPS states, which includes states preserving 2, 4, 6, 8, or 16 supercharges. Through explicit perturbative calculations, we then determine the effective coupling that controls the perturbation expansion for large \mu and estimate the range of parameters and energies for which perturbation theory is valid.
Dasgupta Keshav
Raamsdonk Mark Van
Sheikh-Jabbari Mohammad M.
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