985334
DERIVATIVE CORRECTIONS TO DIRAC–BORN–INFELD AND CHERN–SIMON ACTIONS FROM NONCOMMUTATIVITY
We show that the higher-order derivative α′ corrections to the Dirac–Born–Infeld (DBI) and Chern–Simon actions is derived from noncommutativity in the Seiberg–Witten limit, and is shown to agree with Wyllard's (hep-th/0008125) result, as conjectured by Das et al., (hep-th/0106024). In calculating the corrections, we have expressed in terms of F, Â in terms of A up to order , and made use of it.
8194131
Chiral symmetry breaking and restoration from holography
We study intersection of $N_c$ color D4 branes with $N_f$ Dp-branes and anti-Dp branes in the strong coupling limit in the probe approximation. The resulting model has $U(N_f)\times U(N_f)$ global symmetry. We see an $n$ dimensional theory for $n$ overlapping directions between color and flavor branes. At zero temperature we do see the breakdown of chiral symmetry, but there arises a puzzle: we do not see any massless NG boson to the break down of the chiral symmetry group for $n=2,3$ for a specific p. At finite temperature we do see the restoration of chiral symmetry group and the associated phase transitions are of first order. The chiral symmetry restoration is described by a curve, which connects L, the asymptotic distance of separation between the auarks, with the temperature, T. In general this quantity is very difficult to compute but if we evaluate it numerically then the curve is described by an equation $L T=c$, where c is a constant and is much smaller than one. It means for $L/R_{\tau}$ above $2\pi c$ there occurs the deconfined phase along with the chiral symmetryrestored phase.
14651966
Supersymmetric and nonsupersymmetric perturbations to KT
We studied the supersymmetric and non-supersymmetric perturbations to cascading gauge theory. In particular we use KT background and the back reaction of the generic linearized perturbation make the dilaton to run and the $T^{(1,1)}$ gets squashed which in turn make the supersymmetry to be broken. But if we make a special linearized perturbation in such way that the $T^{(1,1)}$ is not squashed then the corresponding perturbation preserve supersymmetry.
17697869
Coincident Dp-branes in codimension two
We derive the mass shell condition for N coincident D0 branes in codimension two i.e. in space-time dimension three. Using this we present the action for this system in first order formalism. Our analysis is restricted to flat space-time.
18773116
Non-relativistic supersymmetric Dp branes
The supergravity solutions to various p-branes are presented and typically break one quarter of supersymmetry except for the D1 brane case, where they break one half of supersymmetry and are manifestly non-relativistic in nature. The symmetries that the solutions enjoy are that of space and time translations, rotations, boosts but without any scaling and special conformal transformations except for p ? 3. We have also constructed supersymmetric non-relativistic cascading solutions to intersecting D3 and D5 branes on both the singular and on deformed conifold, where D5's are wrapped on S2 of the Calabi?Yau, i.e. the analogs of Klebanov?Tseytlin and Klebanov?Strassler solutions and the supersymmetric non-relativistic M2 brane solution.
119187345
Quantum phase transition in a Dp-Dq system
Using the top-down approach, we study intersecting Dp-Dq brane configuration in string theory and find examples, where there can be a quantum phase transition at zero temperature induced by the violation of the Breitenlohner-Freedman bound at IR, which is done essentially by a combination of charge density and magnetic fields. In particular, there exists a Berezinskii-Kosterlitz-Thouless (BKT) type of transition for D3-D5 and D5-D5 systems. The study of the BKT type of transition is initiated by Jensen et al. [Phys. Rev. Lett. 105, 041601 (2010)] for a D3-D5 system with nonzero charge density and a magnetic field. Here, we show that one can have the BKT transition for a D3-D5 system even in the absence of charge density but requires multiple magnetic fields. In this case the field theory lives in 2 + 1 dimensions, whereas for the D5-D5 type, the transition requires the presence of both the charge density and magnetic fields and the dual field theory lives on a 3 + 1 dimensional spacetime. We also study the D3-D7 system but it does not show the BKT type of transition.
123325200
Production of antinuclei and hypernuclei in a relativistic Hagedorn resonance gas model
122669506
High voltage characteristic of large area cathode pad chambers for muon spectrometer of ALICE
AbstractLarge area Cathode Pad Chambers (CPC) with inner and outer radii of 23.7 cm and 117 cm respectively have been fabricated and tested for 2nd Tracking station of Muon Spectrometer of ALICE.The active area of this detector has a radiation length of less than 2 % and the frames are fabricated with Peek GF-30. The anode wire plane consists of 474 anode wires of which 53 % have lengths greater than 1 meter. The separation between the wire plane and the grounded cathode plane is 2.5 mm. The high voltage behaviour of the chamber have been tested under two situations.
With no support below the wires to reduce sagging of long wires.With a G10 strip-support whose dimension is 950 mm × 2 mm × 2.4 mm.
 The High Voltage (HV) tests show that a better stability is achieved when the strip support is implemented. Therefore this solution has been adopted for operation in ALICE.