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We study the existence of D-brane bound states at threshold in Type II string theories. In a number of situations, we can reduce the question of existence to quadrature, and the study of a particular limit of the propagator for the system of D-branes. This involves a derivation of an index theorem for a family of non-Fredholm operators. In support of the… (More)

- Mark B Stern, Piljin Yi
- 2000

We count the supersymmetric bound states of many distinct BPS monopoles in N = 4 Yang-Mills theories and in pure N = 2 Yang-Mills theories. The novelty here is that we work in generic Coulombic vacua where more than one adjoint Higgs fields are turned on. The number of purely magnetic bound states is again found to be consistent with the electromagnetic… (More)

Cheeger, Goresky, and MacPherson conjectured [CGM] an L2-de Rham theorem: that the intersection cohomology of a projective variety V is naturally isomorphic to the L2cohomology of the incomplete manifold V − Sing V , with metric induced by a projective embedding. The early interest in this conjecture was motivated in large part by the hope that one could… (More)

We consider quantum mechanical Yang-Mills theories with eight supercharges and a Spin(5)× SU(2)R flavor symmetry. We show that all normalizable ground states in these gauge theories are invariant under this flavor symmetry. This includes, as a special case, all bound states of D0-branes and D4-branes. As a consequence, all bound states of D0-branes are… (More)

- Anantha Padmanabhan, Mark B Stern, Judith M Wishin, Mari Mangino, Karen J Richey, Mary DeSane
- American journal of critical care : an official…
- 2007

BACKGROUND
Management of fecal incontinence is a priority in acute and critical care to reduce risk of perineal dermatitis and transmission of nosocomial infections.
OBJECTIVE
To evaluate the safety of the Flexi-Seal Fecal Management System in hospitalized patients with diarrhea and incontinence.
METHODS
A prospective, single-arm clinical study with 42… (More)

- Sonia Paban, Savdeep Sethi, Mark B Stern
- 1998

We consider quantum mechanical gauge theories with sixteen supersymmetries. The Hamiltonians or Lagrangians characterizing these theories can contain higher derivative terms. In the operator approach, we show that the free theory is essentially the unique abelian theory with up to four derivatives in the following sense: any small deformation of the free… (More)

We study the effective action of quantum mechanical SU(N) Yang-Mills theories with sixteen supersymmetries and N > 2. We show that supersymmetry requires that the eight fermion terms in the supersymmetric completion of the v terms be one-loop exact. We also show that the twelve fermion terms in the supersymmetric completion of the v terms are two-loop exact… (More)

- Sonia Paban, Savdeep Sethi, Mark B Stern
- 1998

Higher derivative terms in the effective action of certain Yang-Mills theories can be severely constrained by supersymmetry. We show that requiring sixteen supersymmetries in quantum mechanical gauge theory determines the v 6 term in the effective action. Even the numerical coefficient of the v 6 term is fixed in terms of lower derivative terms in the… (More)

- Sonia Paban, Savdeep Sethi, Mark B Stern
- 2002

We study the extent to which the gauge symmetry of abelian Yang-Mills can be deformed under two conditions: first, that the deformation depend on a two-form scale. Second, that the deformation preserve supersymmetry. We show that (up to a single parameter) the only allowed deformation is the one determined by the star product. We then consider the… (More)

We extend Witten’s spinor proof of the positive mass theorem to large classes of complete asymptotically flat non-spin manifolds, including all manifolds of dimension less than or equal to 11 and all manifolds of dimension n less than 26 which admit codimension 3 immersions into Euclidean space.