We find a new class of spiky solutions for closed strings in flat, $AdS_3\subset AdS_5$ and $R\times S^2(\subset S^5)$ backgrounds. In the flat case the new solutions turn out to be T-dual configurations of spiky strings found by Kruczenski hep-th/0410226. In the case of solutions living in $AdS$, we make a semi classical analysis by taking the large angular momentum limit. The anomalous dimension for these dual spikes is similar to that for rotating and pulsating circular strings in AdS with angular momentum playing the role of the level number. This replaces the well known logarithmic dependence for spinning strings. For the dual spikes living on sphere we find that no large angular momentum limit exists.
我们首先关注AdS_3 x S^1中IIB型弦的有限能隙形式,它允许在黎曼曲面(谱曲线)中编码一个非常大的弦解族的半经典谱。然后,我们表明,在大的角动量的限制,它分为两个不同的表面,允许推导出一个明确的表达式的频谱,这是相应的特点是由两个单独的分支。后者可以解释为弦上出现的两种尖峰:“大”尖峰,对弦的能量和角动量产生无限的贡献;“小”尖峰,代表“大”尖峰背景上的有限激发。在AdS/CFT对应的另一边,我们考虑N=4的超Yang-Mills理论的sl(2)扇区。相应的1-loop频谱,在大的共形自旋限制,也被编码在一个频谱曲线,并在所谓的孔的特征。我们证明,在适当的标识和通常的由尖点反常维数描述的从弱到强的t Hooft耦合的外推下,规范理论和弦论的大S谱是一致的。此外,我们解释了如何“小”和“大”孔可以识别为“小”和“大”尖峰。最后,我们讨论了AdS_3中几个显示有限能隙谱的尖弦解。我们计算它们的谱曲线在大S极限,发现它们对应于有限间隙曲线的模空间的特定区域。我们还解释了如何利用“大”尖峰从弦论中提取出一个离散的自由度系统,然后将其与对偶规范理论算符的自由度相匹配,以及“小”尖峰实际上是如何与R x S ^2中的巨磁振子非常相似的。
我们研究了AdS 3 x S1中的尖峰弦解,其特征在于两个自旋S,J以及S1中的缠绕m和尖峰数n。利用SL(2)型渐近Bethe Anchor方程在强耦合下的首阶解,构造了显式的两截解。与折叠旋转弦不同,这些解具有不对称的贝特根分布。对于任意的半经典参数,包括J=0和S的任意值,即短弦和长弦,这些解与直接从弦论得到的已知尖峰弦经典结果相匹配。当自旋和缠绕数较大时,弦会碰到边界,我们发现一个新的标度极限,其能量为E-S = n /2/ pi sqrt[1+ 4 pi^2/n^2(J^2/ln^2 S + m^2/ln^2 S)] ln S。这是已知的用于折叠的纺纱绳的缩放的一般化。
最近,在AdS 5 x S5中运动的弦的经典解在理解AdS/CFT对应中发挥了重要作用。他们中的一大批人被证明是从一个将弦运动方程的解简化为一个著名的可积1-d系统(称为Neumann-Rosochatius(NR)系统)的研究的一个分析中得出的。然而,其他简单的解,如S5中的尖弦或巨磁振子,并不包括在NR解中。我们表明,当考虑在共形规范,这些解决方案也可以容纳的一个版本的NR系统。这使我们能够详细描述一个巨磁振子解决方案与两个额外的角动量,并表明它可以被解释为一个叠加的两个磁振子以相同的速度移动。此外,我们考虑了自旋链的情况,并将相应的态描述为无限SU(3)自旋链中的两个束缚态。我们构造了这种束缚态的Bethe无规波函数。
We study semiclassical spiky strings in de Sitter space and the corresponding Regge trajectories, generalizing the analysis in anti-de Sitter space. In particular we demonstrate that each Regge trajectory has a maximum spin due to de Sitter acceleration, similarly to the folded string studied earlier. While this property is useful for the spectrum to satisfy the Higuchi bound, it makes a nontrivial question how to maintain mildness of high-energy string scattering which we are familiar with in flat space and anti-de Sitter space. Our analysis implies that in order to have infinitely many highe…
We use the recipe of arXiv:1003.2974 to find half-BPS near-horizon geometries in the t$^3$ model of $N=2$, $D=4$ gauged supergravity, and explicitely construct some new examples. Among these are black holes with noncompact horizons, but also with spherical horizons that have conical singularities (spikes) at one of the two poles. A particular family of them is extended to the full black hole geometry. Applying a double-Wick rotation to the near-horizon region, we obtain solutions with NUT charge that asymptote to curved domain walls with AdS$_3$ world volume. These new solutions may provide in…
Sigma model in $AdS_3\times S^3$ background supported by both NS-NS and R-R fluxes is one of the most distinguished integrable models. We study a class of classical string solutions for $N$-spike strings moving in $AdS_3 \times S^1$ with angular momentum $J$ in $S^1 \subset S^5$ in the presence of mixed flux. We observe that the addition of angular momentum $J$ or winding number $m$ results in the spikes getting rounded off and not end in cusp. The presence of flux shows no alteration to the rounding-off nature of the spikes. We also consider the large $N$-limit of $N$-spike string in $AdS_3 \…
Conformal SO(2,4) Transformations for the Helical AdS String Solution
通过将共形SO(2,4)变换应用于由AdS_3 x S^1中的螺旋弦解给出的具有一定极限的双自旋折叠旋转弦构型,我们构造了新的弦解,其能量-自旋关系由boost参数表征.通过选取两个适当的boost参数,进行两次SO(2,4)变换,在长弦极限下,AdS_3中的单自旋直折叠旋转弦解被变换为长刺弦解,其表达式由AdS_3中的螺旋弦解通过模参数为1的限制给出.
On the giant magnon and spike solutions for strings on AdS$_3\times$ S$^3$
我们研究了具有NS-NS场背景的球上和Anti-de-Sitter时空上的旋转弦的解。作为两种极限情形,我们证明了在恒定磁场存在下R $\times$ S $^2$上磁振子解和单尖峰解的存在性.我们还研究了AdS $_3\times$ S $^3$上弦的Melvin形变解.各种守恒电荷之间的色散关系示出接收有限的修正,由于变形参数。我们进一步研究了AdS $_3 \times$ S $^3$几何上的旋转弦,在S $^3$上有两个守恒角动量,在AdS $_3$上有一个自旋.我们证明了存在两种解:圆弦解和螺旋弦解。我们找出了各种电荷之间的色散关系,并给出了这些解的物理解释。
我们利用把R_t x S ^3上的弦动力学约化为Neumann-Rosochatius可积系统,把这个动力学系统所描述的所有弦解映射到复sine-Gordon可积模型的解上。该映射将对应关系两侧的解中的参数关联起来。在这个方法的框架下,我们找到了有限尺寸弦解,它们在(复)sine-Gordon系统中的映象,以及在R_t x S^2和R_t x S^3两种情况下单尖峰“E-Δ λ”关系的主导有限尺寸效应。
Strings on $AdS_3 \times S^3\times S^3\times S^1$ with mixed flux exhibit exact integrability. We wish to construct an integrable Neumann-Rosochatius (NR) model of strings starting with the type IIB supergravity action in $AdS_3 \times S^3\times S^3\times S^1$ with pure NSNS flux. We observe that the forms of the Lagrangian and the Uhlenbeck integrals of motion of the considered system are NR-like with some suitable deformations which eventually appear due to the presence of flux. We utilize the integrable framework of the deformed NR model to analyze rigidly rotating spiky strings moving only…