Hasil untuk "hep-th"

Emilie Eifer Møller, Rasmus Hvidbjerg Gantzel, Emma Celia Herting et al.

Austin R. Dosch, Mary P. Martos, Samara Singh et al.

Stephen E. Congly, Conar O’Neil, Karen E. Doucette et al.

Saqr Alsakarneh, Omar Al Ta’ani, Sandra Quezada et al.

Brian Weiner, Chris Forsmark, Vikas Khular et al.

Rebecca G. Kim, Claire McDonell, Sarah Burbank et al.

Gerond Lake-Bakaar, Benjamin Milgrom, Clark Kulig et al.

Eleanor Aubrey Belilos, Zoë Post, Raeesh Vahora et al.

Clark Zhang, Christopher Tait, Carlos D. Minacapelli et al.

Caroline R. Meijer, Jaap Bakker, Anneloes Boers et al.

S. Palchaudhuri, A. Parsikia, J.D. Lewis et al.

Adam R. Brown, Hrant Gharibyan, Alexandre Streicher et al.

The growth of the "size" of operators is an important diagnostic of quantum chaos. In arXiv:1802.01198 [hep-th] it was conjectured that the holographic dual of the size is proportional to the average radial component of the momentum of the particle created by the operator. Thus the growth of operators in the background of a black hole corresponds to the acceleration of the particle as it falls toward the horizon. In this note we will use the momentum-size correspondence as a tool to study scrambling in the field of a near-extremal charged black hole. The agreement with previous work provides a non-trivial test of the momentum-size relation, as well as an explanation of a paradoxical feature of scrambling previously discovered by Leichenauer [arXiv:1405.7365 [hep-th]]. Naively Leichenauer's result says that only the non-extremal entropy participates in scrambling. The same feature is also present in the SYK model. In this paper we find a quite different interpretation of Leichenauer's result which does not have to do with any decoupling of the extremal degrees of freedom. Instead it has to do with the buildup of momentum as a particle accelerates through the long throat of the Reissner-Nordstrom geometry.

D. Duc, Nguyen Mong Giao

Based on the mechanism for mass creation in the space-time with extradimensions proposed in our previous work, (arXiv: 1301.1405 [hep-th] 2013) we consider now the mass spectrum of vector bosons in extradimensions. It is shown that this spectrum is completely determined by some function of compactification length and closely related to the metric of extradimensions.

Shailesh Lal, Bindusar Sahoo

A bstractWe compute the two-point correlation functions for the spin-3 theory in three dimensional (Anti-) de Sitter spacetimes by using holographic renormalisation. For the AdS case, we find results consistent with the general requirements of two-dimensional conformal invariance. In the de Sitter case, we find similar results. We discuss consistency requirements on the three point functions 〈T W W 〉 for our results to be compatible with the asymptotic symmetry algebra for AdS case and with the de-Sitter central charge found in hep-th/0106113 by analyzing the stress-tensor. We also discuss why it is very likely that our results are not compatible with the imaginary central charge previously found for higher-spin theories in dS(3).

N. Dorey, Kirill Petunin

A bstractWe study the BPS spectrum and walls of marginal stability of the $ \mathcal{N} = 2 $ supersymmetric theory in four dimensions with gauge group SU(n) and n ≤ Nf < 2n fundamental flavours at the root of the Higgs branch considering only magnetic charges (. . . , 0, 0, −1, 1, 0, 0, . . . ), corresponding to the lightest towers of dyons at weak coupling. The strong-coupling spectrum of this theory was conjectured in hep-th/9902134 to coincide with that of the two-dimensional supersymmetric $ \mathbb{C}{\mathbb{P}^{{2n - {N_f} - 1}}} $ sigma model. Using the Kontsevich-Soibelman wall-crossing formula, we start with the conjectured strong-coupling spectrum and extrapolate it to the weak coupling; we restrict our attention to the special case of $ {\mathbb{Z}_n} $-symmetric masses, where we find the walls of marginal stability explicitly. In the weak-coupling regime, our results precisely agree with the semiclassical analysis of hep- th/9902134 for any values of the complex masses: in addition to the usual dyons, quarks, and W bosons, if the masses obey a particular inequality, the resulting weak-coupling spectrum includes a tower of bound states consisting of a dyon and one or more quarks. For $ {\mathbb{Z}_n} $-symmetric masses, there are bound states with one quark for odd n and no bound states for even n.

Alexander A. Reshetnyak

The details of unconstrained Lagrangian formulations (being continuation of earlier developed research for Bose particles in NPB 862 (2012) 270, [arXiv:1110.5044[hep-th]], Phys. of Part. and Nucl. 43 (2012) 689, [arXiv:1202.4710 [hep-th]]) are reviewed for Fermi particles propagated on an arbitrary dimensional Minkowski space-time and described by the unitary irreducible half-integer higher-spin representations of the Poincare group subject to Young tableaux $Y(s_1,...,s_k)$ with $k$ rows. The procedure is based on the construction of the Verma modules and finding auxiliary oscillator realizations for the orthosymplectic $osp(1|2k)$ superalgebra which encodes the second-class operator constraints subsystem in the HS symmetry superalgebra. Applying of an universal BRST-BFV approach permit to reproduce gauge-invariant Lagrangians with reducible gauge symmetries describing the free dynamics of both massless and massive fermionic fields of any spin with appropriate number of gauge and Stukelberg fields. The general construction possesses by the obvious possibility to derive Lagrangians with only holonomic constraints.

P. Ginsparg

To mark the 20th anniversary of the (14 Aug 1991) commencement of hep-th@xxx.lanl.gov (now arXiv.org), I've adapted this article from one that first appeared in Physics World (2008), was later reprinted (with permission) in Learned Publishing (2009), but never appeared in arXiv. I trace some historical context and early development of the resource, its later trajectory, and close with some thoughts about the future. This version is closer to my original draft, with some updates for this occasion, plus an astounding $2^5$ added footnotes.

Chrysostomos Kalousios, Donovan Young

We present a new, two-parameter family of string solutions corresponding to the holographic duals of specific 1/8-BPS Wilson loops on S^2 in N = 4 supersymmetric Yang-Mills theory. The solutions are obtained using the dressing method on the known longitude solution in the context of the auxiliary sigma-model on S^3 put forth in arXiv:0905.0665[hep-th]. We verify that the regularized area of the worldsheets are consistent with expectations.

T. Hollowood, G. Shore

It is now well-known that vacuum polarisation in QED can lead to superluminal low-frequency phase velocities for photons propagating in curved spacetimes. In a series of papers, we have shown that this quantum phenomenon is dispersive and have calculated the full frequency dependence of the refractive index, explaining in detail how causality is preserved and various familiar results from quantum field theory such as the Kramers-Kronig dispersion relation and the optical theorem are realised in curved spacetime. These results have been criticised in a recent paper by Akhoury and Dolgov arXiv:1003.6110 [hep-th], who assert that photon propagation is neither dispersive nor necessarily causal. In this note, we point out a series of errors in their work which have led to this false conclusion.