639 research outputs found
Kappa-symmetric deformations of M5-brane dynamics
We calculate the first supersymmetric and kappa-symmetric derivative
deformation of the M5-brane worldvolume theory in a flat eleven-dimensional
background. By applying cohomological techniques we obtain a deformation of the
standard constraint of the superembedding formalism. The first possible
deformation of the constraint and hence the equations of motion arises at cubic
order in fields and fourth order in a fundamental length scale . The
deformation is unique up to this order. In particular this rules out any
induced Einstein-Hilbert terms on the worldvolume. We explicitly calculate
corrections to the equations of motion for the tensor gauge supermultiplet.Comment: 17 pages. Additional comments in section
BPS Electromagnetic Waves on Giant Gravitons
We find new 1/8-BPS giant graviton solutions in , carrying
three angular momenta along , and investigate their properties.
Especially, we show that nonzero worldvolume gauge fields are admitted
preserving supersymmetry. These gauge field modes can be viewed as
electromagnetic waves along the compact D3 brane, whose Poynting vector
contributes to the BPS angular momenta. We also analyze the (nearly-)spherical
giant gravitons with worldvolume gauge fields in detail. Expressing the
in Hopf fibration ( fibred over ), the wave propagates along the
fiber.Comment: 25 pages, no figures, v2: references adde
M-theory Supertubes with Three and Four Charges
Using the covariant M5-brane action, we construct configurations
corresponding to supertubes with three and four charges. We derive the BPS
equations and study the full structure of the solutions. In particular, we find
new solutions involving arbitrariness in field strengths.Comment: 24 pages, references added and typos correcte
General 2 charge geometries
Two charge BPS horizon free supergravity geometries are important in
proposals for understanding black hole microstates. In this paper we construct
a new class of geometries in the NS1-P system, corresponding to solitonic
strings carrying fermionic as well as bosonic condensates. Such geometries are
required to account for the full microscopic entropy of the NS1-P system. We
then briefly discuss the properties of the corresponding geometries in the dual
D1-D5 system.Comment: 44 page
Fermions from Half-BPS Supergravity
We discuss collective coordinate quantization of the half-BPS geometries of
Lin, Lunin and Maldacena (hep-th/0409174). The LLM geometries are parameterized
by a single function on a plane. We treat this function as a collective
coordinate. We arrive at the collective coordinate action as well as path
integral measure by considering D3 branes in an arbitrary LLM geometry. The
resulting functional integral is shown, using known methods (hep-th/9309028),
to be the classical limit of a functional integral for free fermions in a
harmonic oscillator. The function gets identified with the classical limit
of the Wigner phase space distribution of the fermion theory which satisfies u
* u = u. The calculation shows how configuration space of supergravity becomes
a phase space (hence noncommutative) in the half-BPS sector. Our method sheds
new light on counting supersymmetric configurations in supergravity.Comment: 28 pages, 2 figures, epsf;(v3) eq. (3.3) clarified and notationally
simplified; version to appear in JHE
1/16-BPS Black Holes and Giant Gravitons in the AdS_5 X S^5 Space
We explore 1/16-BPS objects of type IIB string theory in AdS_5 * S^5. First,
we consider supersymmetric AdS_5 black holes, which should be 1/16-BPS and have
a characteristic that not all physical charges are independent. We point out
that the Bekenstein-Hawking entropy of these black holes admits a remarkably
simple expression in terms of (dependent) physical charges, which suggests its
microscopic origin via certain Cardy or Hardy-Ramanujan formula. We also note
that there is an upper bound for the angular momenta given by the electric
charges. Second, we construct a class of 1/16-BPS giant graviton solutions in
AdS_5 * S^5 and explore their properties. The solutions are given by the
intersections of AdS_5 * S^5 and complex 3 dimensional holomorphic hyperspaces
in C^{1+5}, the latter being the zero loci of three holomorphic functions which
are homogeneous with suitable weights on coordinates. We investigate examples
of giant gravitons, including their degenerations to tensionless strings.Comment: 25 pages, no figures, v2: references added, comments added in the
conclusio
Three-Charge Supertubes in a Rotating Black Hole Background
The low velocity scattering of a D0-F1 supertube in the background of a BMPV
black hole has been investigated in the moduli space approximation by Marolf
and Virmani. Here we extend the analysis to the case of the D0-D4-F1 supertube
of Bena and Kraus. We find that, similarly to the two-charge case, there is a
critical value of the supertube circumferential angular momentum; above this
value an adiabatic merger with the black hole cannot occur. By reconsidering
the calculation of supertube angular momentum in the transverse direction,
correspondence between the worldvolume and supergravity descriptions is
established. We also examine dynamical mergers and discuss their implications.Comment: 38 pages, 9 figures. New discussion of moduli space approximation vs.
exact DBI action, references adde
Holographic anatomy of fuzzballs
We present a comprehensive analysis of 2-charge fuzzball solutions, that is,
horizon-free non-singular solutions of IIB supergravity characterized by a
curve on R^4. We propose a precise map that relates any given curve to a
specific superposition of R ground states of the D1-D5 system. To test this
proposal we compute the holographic 1-point functions associated with these
solutions, namely the conserved charges and the vacuum expectation values of
chiral primary operators of the boundary theory, and find perfect agreement
within the approximations used. In particular, all kinematical constraints are
satisfied and the proposal is compatible with dynamical constraints although
detailed quantitative tests would require going beyond the leading supergravity
approximation. We also discuss which geometries may be dual to a given R ground
state. We present the general asymptotic form that such solutions must have and
present exact solutions which have such asymptotics and therefore pass all
kinematical constraints. Dynamical constraints would again require going beyond
the leading supergravity approximation.Comment: 87 pages, begins with 10 page self contained summary of
results;v2:JHEP version; v3: typos corrected, see in particular formula D.1
Spinning Strings as Small Black Rings
Certain supersymmetric elementary string states with spin can be viewed as
small black rings whose horizon has the topology of S^1 \times S^{d-3} in a
d-dimensional string theory. By analyzing the singular black ring solution in
the supergravity approximation, and using various symmetries of the \alpha'
corrected effective action we argue that the Bekenstein-Hawking-Wald entropy of
the black string solution in the full string theory agrees with the statistical
entropy of the same system up to an overall normalization constant. While the
normalization constant cannot be determined by the symmetry principles alone,
it can be related to a similar normalization constant that appears in the
expression for small black holes without angular momentum in one less
dimension. Thus agreement between statistical and macroscopic entropy of
(d-1)-dimensional non-rotating elementary string states would imply a similar
agreement for a d-dimensional elementary string state with spin. Our analysis
also determines the structure of the near horizon geometry and provides us with
a geometric derivation of the Regge bound. These studies give further evidence
that a ring-like horizon is formed when large angular momentum is added to a
small black hole.Comment: LaTeX file, 31 pages; v2: references to earlier work adde
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