We argue that in ($p+3$)d string theory the existence of NS-NS type $p$-brane with negative tension is essential to obtain background geometry $R_2$ or $R_2 / Z_n$ on the transverse dimensions, and the usual codimension-2 brane solutions with these background geometries already contain the negative tension NS-brane implicity in their ansatz. Such an argument leads us, in the context of brane world scenarios, to a conjecture that true background $p$-brane immanent in our spacetime may perhaps be NS-NS type brane, rather than D-brane.
We revisit the idea that the quantum dynamics of open strings ending on $N$ D3-branes in the large $N$ limit can be described at large `t Hooft coupling by classical closed string theory in the background created by the D3-branes in asymptotically flat spacetime. We study the resulting thermodynamics and compute the Hagedorn temperature and other properties of the D3-brane worldvolume theory in this regime. We also consider the theory in which the D3-branes are replaced by negative branes and show that its thermodynamics is well behaved. We comment on the idea that this theory can be thought o…
Comments on $SO/Sp$ Gauge Theories from Brane Configurations with an O6 Plane
我们使用M理论的方法，在存在的orientifold O 6平面，以了解某些方面的真空N=1超对称$SO(N_c)/Sp(N_c)$规范理论在四维。通过利用O6 orientifold的一些一般性质，我们重现了以前获得的一些结果与orientifold O4平面时，味群产生的世界体积动力学的D6膜。用半无限D4膜代替D6膜，得到了N=1有质量超对称规范理论真空模空间的旋转曲线的最一般形式.
In this short note we formulate Covariant Hamiltonian formalism for strings, p-branes and Non-BPS Dp-branes. We also analyse the vacuum tachyon condensation in case of unstable D1-brane.
我们系统地重新审视了轨道折叠上的$D$ -膜的描述以及通过K-理论对其电荷的分类。我们包括足够的细节，使结果访问物理学家和数学家感兴趣的这些主题。在Z_N轨道折叠中，K-理论预言的具有$N$奇数的最小荷电膜只有BPS。我们用Z_3的边界态形式证实了这一结果。对于有和没有离散挠率的Z_N x Z_N轨道，我们证明了电荷的K-理论分类与边界态方法一致，包括Chan-Paton因子的表示类型。
The Swampland program relies heavily on the conjecture that there can only be a finite number of flux vacua (FFV conjecture). Stipulating this FFV conjecture and applying it to some older work in flux vacua construction we show that within a patch of the landscape the FFV conjecture makes predictions on the non-existence of otherwise viable non-perturbative objects arising from brane recombination. Future gains in direct non-perturbative analysis could therefore not only test this prediction but also test portions of the Swampland program itself. We also discuss implications of a weaker FFV co…
我们将两时间物理学的思想和形式从粒子动力学推广到弦和p-膜（p >= 1）动力学的一些具体例子。两次弦或p-膜作用量可以是规范固定的，以产生各种一次弦或p-膜作用量，这些作用量在规范变换下彼此对偶。我们讨论了对应于平坦（d-1）+1时空中的无张力弦和p-膜、平坦（d-1）+1时空中的刚性弦和p-膜以及在AdS_{d-n} x S^n背景中传播的无张力弦和p-膜的特殊规范。
We study dynamics of (m,n)-string in (p,q)-five brane and (p,q)-string background. We determine world-volume stress energy tensor and we analyze the dependence of the string's dynamics on the values of the charges (m,n) and the value of the angular momentum.
We study D-brane actions in non-relativistic string theory. We consider single D-brane and analyse its properties under T-duality. We also derive an action for N D8-branes and also for lower dimensional D-branes through T-duality transformations.
A ghost D-brane has been proposed as an object that cancels the effects of a D-branes. We construct a classical solution with an arbitrary number of D-branes and ghost D-branes in the context of open string field theory. Cancellation of BRST cohomolgy between D-branes and ghost D-branes is shown.
