Abbaspour-tamijani
Reza | A Noncommutative Superalgebra in 2 Dimensions | Abstract: To be prepared. |
Aharony
Ofer | TBA (probably related to AdS/CFT correspondence) | Abstract: |
Alishahiha
Mohsen | One-loop correction in Boundary String Field Theory | Abstract: We compute one-loop correction to the string field theory action of the tachyon by making use of the partition function of the two dimensional worldsheet theory on the annulus. Although in this level, the general shape of the tachyon potential does not change, the tachyon zero mode dependence is quite complicated. In particular, the genus expansion is not governed by the effective string coupling which is defined in terms of the tachyon by \lambda=g_s exp(-T^2/4). We shall considre the action both for unstable and brane-antibrane cases and those with a nonzero B-field as well. |
Anagnostopoulos
Konstantinos | The quantum geometry of string theory | Abstract: TBA |
Bakas
Ioannis | Periodic Solitons | Abstract: |
Das
Sumit | Holograms of Unruh Radiation | Abstract: A uniformly acclerated observer in anti-deSitter space-time is known to detect thermal radiation when the acceleration exceeds a critical value. We investigate the holographic interpretation of this phenomenon. For uniformly accelerated trajectories {\it transverse} to the boundary of the $AdS$ space, the hologram is a blob which expands {\it along} the boundary. Observers on the boundary co-moving with the hologram become observers in cosmological space-times. For supercritical accelerations one gets a Milne universe when the holographic screen is the boundary in Poincar\'e coordinates, while for the boundary in hyperspherical coordinates one gets deSitter spacetimes. The presence or absence of thermality is then interpreted in terms of specific classes of observers in these cosmologies. |
Dimopoulos
Savvas | Large Extra Dimensions | Abstract: TBA |
Elitzur
Shmuel | D branes on background of NS Branes. | Abstract: The dynamics of D branes in the near horizon geometry of NS branes is studied using world sheet boundary state method. |
Fatollahi
Amir | Electrodynamics On Matrix Space Non-Abelian By Coordinates | Abstract: We consider the dynamics of a charged particle in a space whose coordinates are $N\times N$ hermitian matrices. Putting things in the framework of D0-branes, we find that the transformations of the matrix coordinates induce non-Abelian transformations on the gauge potentials. The Lorentz equations of motion for matrix coordinates are derived, and it is observed that the field strengths also transform like their non-Abelian counterparts. The issue of the map between theory on matrix space and ordinary non-Abelian gauge theory is discussed. The phenomenological aspects of ``finite-N non-commutativity" for the bound states of D0-branes appear to be very attractive. |
Floratos
Emmanuel | Stability analysis of rotating membranes in Supermembrane Theory. | Abstract: The fate of spherical topology rotating membranes is studied in the context of 11-dim Supermembrane theory .The perfect spheres are classically and quantum mechanically stable,while ellipsoidal membranes are classically unstable and they decay in finger(polymer) like configurations.The implications of these findings is discussed. |
Giveon
Amit | To Be Announced | Abstract: To Be Announced |
Gopakumar
Rajesh | Open-Closed String Dualities and M-Theory | Abstract: |
Imaanpur
Ali | Instantons on D-branes in a background B-field | Abstract: We consider Euclidean D4 and D6-branes filling the whole R^4 and R^6 space, respectively. In a background B-field, we construct an action which could be easily supersymmetrized. The BPS configurations of these theories are then examined. For D4-branes, these are the BPS states derived by Seiberg and Witten. We discuss the generalization to the 6 dimensions. |
Kamani
Davoud | T-Duality and Noncommutative DBI action | Abstract: |
Kounnas
Costas | 5-Brane Solutions Free of Strong Coupling Singularities | Abstract: 5-Brane Solutions Free of Strong Coupling Singularities |
Krause
Axel | An Alternative to Inflation? | Abstract: TBA |
Mandal
Gautam | Matrix model, noncommutative geometry and brane-antibrane systems | Abstract: We use BFSS matrix model to study the D2/anti-D2 brane system, the relevant noncommutative gauge theory and tachyon condensation. We find the exact tachyon potential by solving gauge fixing conditions exactly for static configurations. We exhibit a path connecting the brane-antibrane configuration to the vacuum and verify the noncommutative version of Sen conjecture. We show closed string excitations around the vacuum. |
Minwalla
Shiraz | The 0 Brane as a Soliton | Abstract: We construct the D0 brane as a soliton on the worldvolume of a D2-brane in a large magnetic field, and study its properties. |
Mukhi
Sunil | Gauge-Invariant Couplings of Noncommutative | Abstract: The couplings of noncommutative D-branes to spatially varying Ramond-Ramond fields are derived and expressed in terms of *n products of operators involving open Wilson lines. Equivalence of the noncommutative to the commutative couplings implies interesting identities as well as an expression for the Seiberg-Witten map that was previously conjectured. We generalise our couplings to include transverse scalars and unstable non-BPS branes. |
Oz
Yaron | AdS/CFT | Abstract: |
Rabinovici
Eliezer | On The Nature Of the Hagedorn transition in NCOS systems | Abstract: |
Sadooghi
Neda | Global and Gauge Anomalies in Noncommutative Gauge Theories | Abstract: Anomalies in relation to nonplanar triangle diagrams of noncommutative gauge theory are studied. Local chiral gauge anomaly for noncommutative U(1) and U(N) gauge theories with adjoint matter fields is determined perturbatively and shown to vanish for both planar and nonplanar diagrams. For U(1) gauge theory with fundamental matter field coupling, three different noncommutative currents are found, which give the same global symmetry and lead to the same classically conserved charge. Only one of these currents yields a nonplanar contribution and leads to a finite global anomaly for light-like noncommutativity parameter \theta_{\mu\nu}, of a novel form. |
Savvidis
Georgios | Electromagnetic scattering on D3-brane spikes | Abstract: We consider scattering of electromagnetic plane waves on a D3-brane spike which emanates normal to D3-barne in the extra space direction. We are interested in studying physical effects on D3-brane which are produced by a spike attached to D3-brane. We have observed that the spike sucks almost all electromagnetic radiation and therefore acts like a charged black hole. This is because absorption cross section for j=1 tends to a constant at low energy limit. Instead, the scattered part of the radiation on a D3-brane tends to zero demonstrating non-Thompson behaviour. |
Shenker
Stephen | Some Reflections on the State of String Theory | Abstract: T B A |
Sonnenschein
Jacob | BPS domain walls from SW theory, MQCD and holography | Abstract: .BPS domain walls from SW theory, MQCD and holography |
Staudacher
Matthias | Reduced D=10 Super Yang-Mills d=4 Wilson Loops and d=1 Indices | Abstract: Ten-dimensional susy Yang-Mills theories remain supersymmetric upon dimensional reduction to d dimensions. In the first part of the talk we will discuss d=4 and present a full perturbative two-loop calculation of two Wilson lines, commenting on making contact with the dual AdS/CFT computation. In the second part we discuss d=1 and d=0 and review the puzzling status of Witten index computations for susy matrix quantum mechanics. |
Thiagarajan
Jayaraman | Exceptional Sheaves, Helices and D-branes on CY manifolds | Abstract: |