IA Scholar Query: Linear Approximation of Shortest Superstrings
https://scholar.archive.org/
Internet Archive Scholar query results feedeninfo@archive.orgMon, 27 Jun 2022 00:00:00 GMTfatcat-scholarhttps://scholar.archive.org/help1440Holographic tensor network models and quantum error correction: a topical review
https://scholar.archive.org/work/6osab3znwzbxxkeoisgdmf224e
Recent progress in studies of holographic dualities, originally motivated by insights from string theory, has led to a confluence with concepts and techniques from quantum information theory. A particularly successful approach has involved capturing holographic properties by means of tensor networks which not only give rise to physically meaningful correlations of holographic boundary states, but also reproduce and refine features of quantum error correction in holography. This topical review provides an overview over recent successful realizations of such models. It does so by building on an introduction of the theoretical foundations of AdS/CFT and necessary quantum information concepts, many of which have themselves developed into independent, rapidly evolving research fields.Alexander Jahn, Jens Eisert, Universitätsbibliothek Der FU Berlinwork_6osab3znwzbxxkeoisgdmf224eMon, 27 Jun 2022 00:00:00 GMTLinear-Time Computation of Shortest Covers of All Rotations of a String
https://scholar.archive.org/work/mmuxmvabx5cpnaecw4647e3tni
We show that lengths of shortest covers of all rotations of a length-n string over an integer alphabet can be computed in 𝒪(n) time in the word-RAM model, thus improving an 𝒪(n log n)-time algorithm from Crochemore et al. (Theor. Comput. Sci., 2021). Similarly as Crochemore et al., we use a relation of covers of rotations of a string S to seeds and squares in S³. The crucial parameter of a string S is the number ξ(S) of primitive covers of all rotations of S. We show first that the time complexity of the algorithm from Crochemore et al. can be slightly improved which results in time complexity Θ(ξ(S)). However, we also show that in the worst case ξ(S) is Ω(|S|log |S|). This is the main difficulty in obtaining a linear time algorithm. We overcome it and obtain yet another application of runs in strings.Maxime Crochemore, Costas S. Iliopoulos, Jakub Radoszewski, Wojciech Rytter, Juliusz Straszyński, Tomasz Waleń, Wiktor Zuba, Hideo Bannai, Jan Holubwork_mmuxmvabx5cpnaecw4647e3tniWed, 22 Jun 2022 00:00:00 GMTMaking de Bruijn Graphs Eulerian
https://scholar.archive.org/work/lcvy4toohbcm7ikdcjqzlnbgge
A directed multigraph is called Eulerian if it has a circuit which uses each edge exactly once. Euler's theorem tells us that a weakly connected directed multigraph is Eulerian if and only if every node is balanced. Given a collection S of strings over an alphabet Σ, the de Bruijn graph (dBG) of order k of S is a directed multigraph G_{S,k}(V,E), where V is the set of length-(k-1) substrings of the strings in S, and G_{S,k} contains an edge (u,v) with multiplicity m_{u,v}, if and only if the string u[0]⋅ v is equal to the string u⋅ v[k-2] and this string occurs exactly m_{u,v} times in total in strings in S. Let G_{Σ,k}(V_{Σ,k},E_{Σ,k}) be the complete dBG of Σ^k. The Eulerian Extension (EE) problem on G_{S,k} asks to extend G_{S,k} with a set ℬ of nodes from V_{Σ,k} and a smallest multiset 𝒜 of edges from E_{Σ,k} to make it Eulerian. Note that extending dBGs is algorithmically much more challenging than extending general directed multigraphs because some edges in dBGs are by definition forbidden. Extending dBGs lies at the heart of sequence assembly [Medvedev et al., WABI 2007], one of the most important tasks in bioinformatics. The novelty of our work with respect to existing works is that we allow not only to duplicate existing edges of G_{S,k} but to also add novel edges and nodes, in an effort to (i) connect multiple components and (ii) reduce the total EE cost. It is easy to show that EE on G_{S,k} is NP-hard via a reduction from shortest common superstring. We further show that EE remains NP-hard, even when we are not allowed to add new nodes, via a highly non-trivial reduction from 3-SAT. We thus investigate the following two problems underlying EE in dBGs: 1) When G_{S,k} is not weakly connected, we are asked to connect its d > 1 components using a minimum-weight spanning tree, whose edges are paths on the underlying G_{Σ,k} and weights are the corresponding path lengths. This way of connecting guarantees that no new unbalanced node is added. We show that this problem can be solved in 𝒪(|V|klog d+|E|) [...]Giulia Bernardini, Huiping Chen, Grigorios Loukides, Solon P. Pissis, Leen Stougie, Michelle Sweering, Hideo Bannai, Jan Holubwork_lcvy4toohbcm7ikdcjqzlnbggeWed, 22 Jun 2022 00:00:00 GMTFabrication and validation of an intraneural interface tailored for optic nerve stimulation
https://scholar.archive.org/work/dvxbcydanrfdvi2i746gh7xcp4
Chapter 0 thank you for the so diverse discussions in the office during endless VR experiments, and for your lovely kids, William and Diylan. Dani, thank you for having chosen our lab again after my supervision, I would have never thought that, after the NWs project, you would have come back and yet, here you are, I thank you for all the discussions about finance and culture, also for listening to all the paranoic stuff I say! Franklin, thank you for all the conversation about data analysis that helped me shape the final "return " paper and for having accepted to co-supervise Léa. Sandrine, thank you for your optimism and smile. Thank you Golenaz for all the creative beauty that you brought within among us. Thank you Fred for your administrative and emotional support. And finally a big thanks to Elodie, who is the "LNE mum" and for the immense support during animal experiments. Thank you all for your HUGE professional and moral support. Your friendship has been key to survive this PhD! It will be very hard to find such a wonderful environment ever again. . . A big thanks goes as well to the students who contributed to this PhD during their bachelors, master s or even PhD projects. They all had to face challenging tasks and learn a lot in maybe not so much time, but they all did their best and believe d in it. Thank you Deborha, Marina, Marie, Mathilde, Daniela, Léa. A special thanks goes to Dani, Julie, Livia, Giulia with whom it became more than just work. Julie, thank you for all the photos and videos during events and experiments; Livia, thank you for all the brainstorming sessions and for having introduced me to the "genuine influencers". Giulia, thank you for having introduced me to climbing. Outside the lab, but within EPFL, I would like to thank the Innovation Forum Lausanne family, past and present members. Every one of them taught me something on teamwork and leadership. It has been an invaluable experience, getting in touch and knowing meeting so many stakeholders in the innovation ecosystem. A unique experience that I would do all over again tomorrow. Thanks to my friends from EPFL, Ece, Aileen, Paul, Hugo, Clementine with whom we continue the adventure of PhD and enjoy the time in Lausanne during games nights, hiking days, wine making and dinners. A special thanks to Anna, my breakfast buddy in Geneva, femtech lover and creative soul that remind me to always shine! I would like to thank the Sandbox family, Aleks, Nettra, Iselyn, Luca, Joachim, Galina and Anna (again) for having welcomed me into this exquisite group of open-minded people. And because I'm Italian, I cannot thank enough the Lausangeles team, Andrea, Gian Franco, Michele, Claudia, Daniel for keeping me rooted to my origin even in a foreign land. I would like to thank the "Dinér presque que parfait" team for the high level vegeratarians dinners at home! Then I would like to thank my PoliMi friends, Chiara, Francesca, Alberto, Giulia and Nevio, Gea and Gimmy for their long-lasting friendship! An immense thank you goes to Serena, Anna and Olimpia, for being there since ever! You are my girls, my rocks where I know I can always rely on, my safe harbor when life is a storm. I would like to thank my cousin Teresa, my big sister, my muse, my support in Lausanne. My deepest gratitude goes to my Swiss family, Genevieve, Jean-Yves, Simon, Mathieu, Mina and Meiko. . . You all have been crucial in one of the most difficult period of my life and throughout the PhD. You were there when I could not be with my family and I felt as if I was with them. iii Chapter 0 Acknowledgements COVID-19 has changed lives forever, mine for sure has too but I will be always grateful for my loving family, Marina, Tonino and Betta. You are my force. Thank you for having given me the possibility to be where I am today, thank you for all the sacrifices you did for me, for the constant love and support. Your "kamikaze" would not go anywhere if she did not know there is always an invisible safety net. Last but not least, my immense gratitude goes to Nicolas, my favorite person. You are the best teammate, housemate, partner I could have ever asked for. I love spending countless hours discussing science, startups, finance, society, meme culture among other topics. I learn everyday something new with you. Your curiosity is contagious. Thank you for all the hours spent troubleshooting on Saturdays and Sundays in the lab with me, for being there during my stressful periods, for understanding when to give me space, supporting and discussing with me every single decision. They say home is where your heart is set in stone. It's where you go when you're alone. It's where you go to rest your bones. It's not just where you lay your head. It's not just where you make your bed. As long as we're together, it doesn't matter where we go.Eleonora Bordawork_dvxbcydanrfdvi2i746gh7xcp4Mon, 20 Jun 2022 00:00:00 GMTSequential and parallel algorithms for sequence analysis problems in bioinformatics
https://scholar.archive.org/work/6t3yljspkrff3f5a4ix4ahy7uy
The study of biological and genetic information, mostly DNA data, is an extremely important subject which can provide critical information in many areas, such as understanding human diseases or discovering new drugs. A huge number of computing algorithms are developed and available now to help with the study of these, and in order to solve these problems more efficiently and accurately, much attention has been paid in recent decades to developing new and better algorithms. [continues]Xuan Liuwork_6t3yljspkrff3f5a4ix4ahy7uyWed, 08 Jun 2022 00:00:00 GMTGauge Theories of Gravitation
https://scholar.archive.org/work/yph3znzkxjdvhacu6af2k5757e
During the last five decades, gravity, as one of the fundamental forces of nature, has been formulated as a gauge theory of the Weyl-Cartan-Yang-Mills type. The present text offers commentaries on the articles from the most prominent proponents of the theory. In the early 1960s, the gauge idea was successfully applied to the Poincar\'e group of spacetime symmetries and to the related conserved energy-momentum and angular momentum currents. The resulting theory, the Poincar\'e gauge theory, encompasses Einstein's general relativity as well as the teleparallel theory of gravity as subcases. The spacetime structure is enriched by Cartan's torsion, and the new theory can accommodate fermionic matter and its spin in a perfectly natural way. This guided tour starts from special relativity and leads, in its first part, to general relativity and its gauge type extensions \'a la Weyl and Cartan. Subsequent stopping points are the theories of Yang-Mills and Utiyama and, as a particular vantage point, the theory of Sciama and Kibble. Later, the Poincar\'e gauge theory and its generalizations are explored and special topics, such as its Hamiltonian formulation and exact solutions, are studied. This guide to the literature on classical gauge theories of gravity is intended to be a stimulating introduction to the subject.Milutin Blagojević, Friedrich W. Hehlwork_yph3znzkxjdvhacu6af2k5757eSun, 08 May 2022 00:00:00 GMTAspects of 4d supersymmetric dynamics and geometry
https://scholar.archive.org/work/i7pxaybnibhwpdci7biewurdwq
In this set of five lectures we present a basic toolbox to discuss the dynamics of four dimensional supersymmetric quantum field theories. In particular we overview the program of geometrically engineering the four dimensional supersymmetric models as compactifications of six dimensional SCFTs. We discuss how strong coupling phenomena in four dimensions, such as duality and emergence of symmetry, can be naturally imbedded in the geometric constructions. The lectures mostly review results which previously appeared in the literature but also contain some unpublished derivations.Shlomo S. Razamat, Evyatar Sabag, Orr Sela, Gabi Zafrirwork_i7pxaybnibhwpdci7biewurdwqWed, 04 May 2022 00:00:00 GMTNear-field phase transformation for radiation performance enhancement and beam steering of resonant cavity antennas
https://scholar.archive.org/work/6ybejwqvofcprmerc3e4hsv5dq
Resonant-cavity antennas (RCAs) are promising candidates in advanced wireless applications because of their moderate-to-high gain, simple configuration,low and planar profile, and lack of feed networks. This dissertation presentsnovel mechanisms to enhance directivity and other radiation characteristics andto steer beam of RCAs. Solutions to both challenges are based on near-fieldphase transformation and have been demonstrated by designing metasurfacesfor this transformation. A classical RCA comprising of a patch antenna and anunprinted all-dielectric superstructure is considered as the base antenna to assessthe effectiveness of the proposed solutions.To enhance directive radiation characteristics, a near-field phase transformation methodology is developed to improve the uniformity of electric near-fieldphase distribution. This is realized by designing several phase-correcting structures/surfaces (PCSs). This novel method employs electromagnetic (EM) simulators to accurately obtain a non-uniform phase distribution on the apertureof RCAs. Two different types of PCSs prototypes were developed. The firstproof-of-concept prototype is an all-dielectric varying-height PCS with a steppedgeometry, which corrects the phase at discrete points on the RCA aperture. Simulation and measurement results of the classical RCA with the PCS indicatethat the PCS increases the peak directivity of the RCA by 9 dB (from 12.5 dBito 21.2 dBi) and enhances its uniform aperture area by 178%. As an extensionto this, a quasi-analytical approach is developed and is utilised to synthesise a continuous PCS for a circularly polarized (CP) RCA. The performance of thecontinuous PCS is evaluated through numerical simulations, and predicted resultsindicate that the improvement in radiation performance is comparable to whatwas achieved with the former dielectric PCS. The second PCS prototype was acompact, lightweight design, which was implemented using printed phase-shiftingelements. The planar PCS prototype is 57% lighter and is only 9% of the maximumheight [...]Muhammad Usman Afzalwork_6ybejwqvofcprmerc3e4hsv5dqTue, 29 Mar 2022 00:00:00 GMTEngineering, Technology & Applied Science Research (ETASR), Vol. 12, No. 1, pp. 7974-8227
https://scholar.archive.org/work/vvomu35waff6fmfq5ucryrgqjq
Engineering, Technology & Applied Science Research (ETASR) is an international bimonthly wide scope, peer-reviewed open access journal for the publication of original articles concerned with diverse aspects of science application, technology, and engineering. The journal was first published in February 2011. ISSN: 1792-8036 and 2241-4487. ETASR is indexed in the Web of Science Core Collection (former Web of Science/Thomson Reuters Master Journal List), through the Emerging Sources Citation Index, is a Crossref member (DOI prefix: 10.48084), and has been awarded a DOAJ seal. The table of contents for this issue can be found at: https://etasr.com/index.php/ETASR/issue/view/73. For more info visit the journal's site at: www.etasr.com.Variouswork_vvomu35waff6fmfq5ucryrgqjqSat, 19 Mar 2022 00:00:00 GMTScaling up Ranking under Constraints for Live Recommendations by Replacing Optimization with Prediction
https://scholar.archive.org/work/4icsbwpng5bsrjz4vtwweo3plu
Many important multiple-objective decision problems can be cast within the framework of ranking under constraints and solved via a weighted bipartite matching linear program. Some of these optimization problems, such as personalized content recommendations, may need to be solved in real time and thus must comply with strict time requirements to prevent the perception of latency by consumers. Classical linear programming is too computationally inefficient for such settings. We propose a novel approach to scale up ranking under constraints by replacing the weighted bipartite matching optimization with a prediction problem in the algorithm deployment stage. We show empirically that the proposed approximate solution to the ranking problem leads to a major reduction in required computing resources without much sacrifice in constraint compliance and achieved utility, allowing us to solve larger constrained ranking problems real-time, within the required 50 milliseconds, than previously reported.Yegor Tkachenko, Wassim Dhaouadi, Kamel Jedidiwork_4icsbwpng5bsrjz4vtwweo3pluMon, 14 Feb 2022 00:00:00 GMTGraph theoretical Strategies in De Novo Assembling
https://scholar.archive.org/work/3u5ufjvk7rdaxpruh5xjhdbezy
De novo genome assemblers assume the reference genome is unavailable, incomplete, highly fragmented, or significantly altered as in cancer tissues. Algorithms for de novo assembly have been developed to deal with and assemble a large number of short sequence reads from genome sequencing. In this review paper, we have provided an overview of the graph-theoretical side of de novo genome assembly algorithms. We have investigated the construction of fourteen graph data structures related to OLC-based and DBG-based algorithms in order to compare and discuss their application in different assemblers. In addition, the most significant and recent genome de novo assemblers are classified according to the extensive variety of original, generalized, and specialized versions of graph data structures. INDEX TERMS Combinatorial data structures, de-Bruijn graph, de novo assembly algorithms, high throughput sequencing, overlap graph.Kimia Behizadi, Nafiseh Jafarzadeh, Ali Iranmaneshwork_3u5ufjvk7rdaxpruh5xjhdbezyQuiver vacua geometry and fermions on branes
https://scholar.archive.org/work/e5medcrtefc57e4vcfiwro5lbi
This thesis explores two topics from the intersection between string theory, quantum field theory, and geometry. While the two topics share some overarching themes, for practical purposes they are distinct areas of research. Therefore this work is presented in two parts, treated separately. Quiver vacua geometry Supersymmetric quantum fields theories with eight supercharges are intimately related with numerous topics in geometry. Theories living in three dimensions and enjoying N=4 supersymmetry are perhaps the most accessible such theories. The fields in these theories are arranged into hyper- and vector multiplets, both containing scalar fields. The field-content and symmetries of these theories may be denoted using a quiver, a type of graph in which edges and nodes have specific interpretations in terms of multiplets and symmetries. The possible lowest energy states (vacua) for these theories are associated to vacuum expectation values (VEVs) of the scalar fields. These possible vacua can be organised as an affine variety wherein each point corresponds to a particular set of scalar VEVs. This variety is called the moduli space of vacua for the theory in question. For the class of linear quivers, these varieties are known to be nilpotent varieties in sl_n. In Part I of this thesis, after introducing the necessary machinery, we explore the geometry of the moduli space of vacua of two sets of quiver gauge theories which appear as natural generalisations of the linear case. These are circular quiver gauge theories and D-type Dynkin quiver gauge theories. A central tool in our work is the Kraft-Procesi transition which can be thought of as a physical interpretation of the singularity structure of the affine variety associated to the possible vacua for a given theory. Fermions on branes In Part II we make a detailed study of the fermionic fields living on brane worldvolumes. In string phenomenology many of the most promising candidates for the construction of a small, positive cosmological constant in a string theor [...]Jamie Rogerswork_e5medcrtefc57e4vcfiwro5lbiSubtrajectory Clustering: Finding Set Covers for Set Systems of Subcurves
https://scholar.archive.org/work/mw26ykss7zhszi3xefjyaqfm7m
We study subtrajectory clustering under the Fréchet distance. Given one or more trajectories, the task is to split the trajectories into several parts, such that the parts have a good clustering structure. We approach this problem via a new set cover formulation, which we think provides a natural formalization of the problem as it is studied in many applications. Given a polygonal curve P with n vertices in fixed dimension, integers k, ℓ≥ 1, and a real value Δ > 0, the goal is to find k center curves of complexity at most ℓ such that every point on P is covered by a subtrajectory that has small Fréchet distance to one of the k center curves (≤Δ). In many application scenarios, one is interested in finding clusters of small complexity, which is controlled by the parameter ℓ. Our main result is a bicriterial approximation algorithm: if there exists a solution for given parameters k, ℓ, and Δ, then our algorithm finds a set of k' center curves of complexity at most ℓ with covering radius Δ' with k' ∈ O( k ℓ^2 log (k ℓ)), and Δ'≤ 19 Δ. Moreover, within these approximation bounds, we can minimize k while keeping the other parameters fixed. If ℓ is a constant independent of n, then, the approximation factor for the number of clusters k is O(log k) and the approximation factor for the radius Δ is constant. In this case, the algorithm has expected running time in Õ( k m^2 + mn) and uses space in O(n+m), where m=⌈L/Δ⌉ and L is the total arclength of the curve P.Hugo A. Akitaya, Frederik Brüning, Erin Chambers, Anne Driemelwork_mw26ykss7zhszi3xefjyaqfm7mWed, 22 Dec 2021 00:00:00 GMTThe Desert and the Swampland
https://scholar.archive.org/work/3lph2wqanjhjrip2tny7xtgxwq
The most natural expectation away from asymptotic limits in moduli space of supergravity theories is the desert scenario, where there are few states between massless fields and the quantum gravity cutoff. In this paper we initiate a systematic study of these regions deep in the moduli space, and use it to place a bound on the number of massless modes by relating it to the black hole species problem. There exists a consistent sub-Planckian UV cutoff (the species scale) which resolves the black hole species problem without bounding the number of light modes. We reevaluate this in the context of supersymmetric string vacua in the desert region and show that even though heuristically the species scale is compatible with expectations, the BPS states of the actual string vacua lead to a stronger dependence of the cutoff scale on the number of massless modes. We propose that this discrepancy, which can be captured by the "BPS desert conjecture", resurrects the idea of a uniform bound on the number of light modes as a way to avoid the black hole species problem. This conjecture also implies a stronger form of the Tadpole Conjecture, which leads to an obstruction in stabilizing all moduli semi-classically for large number of moduli in flux compactifications.Cody Long, Miguel Montero, Cumrun Vafa, Irene Valenzuelawork_3lph2wqanjhjrip2tny7xtgxwqTue, 21 Dec 2021 00:00:00 GMTTunable Faraday rotation of ferromagnet thin film in whole visible region coupled with aluminum plasmonic arrays
https://scholar.archive.org/work/qncyqobqqzfzfpouxkqfroctg4
To date, the plasmonic nanostructure utilized for magneto-optical (MO) enhancement has been limited to noble metals with resulted enhancement in the green-red part of visible spectrum. In this study, we fabricated a diffractive hexagonal array composed of Al nanoparticles (NPs) with a thin 7.5 nm ferromagnetic film and pushed the enhanced Faraday rotation (FR) into the blue to green range of the visible light. The freedom and ability to control the working spectral region in the whole visible range from 400 to 800 nm were also demonstrated by changing the lattice constant and the dielectric environment of plasmonic nanostructures. Particularly, in the blue range we obtained the maximum FR 0.57° at 410 nm with a broad boosting region around 0.5° from 400 to 500 nm. Moreover, the largest FR 1.66° was shown at 638 nm by tuning the dielectric environment into a higher refractive index medium. The results of our investigation demonstrate the potential of Al-based magnetoplasmonic effect and offer opportunities to push the MO spectral response out of visible range into the ultraviolet-blue range.Feifei Zhang, Taisuke Atsumi, Xiaolun Xu, Shunsuke Murai, Katsuhisa Tanakawork_qncyqobqqzfzfpouxkqfroctg4Mon, 29 Nov 2021 00:00:00 GMTGreedy-reduction from Shortest Linear Superstring to Shortest Circular Superstring
https://scholar.archive.org/work/4smruw72gjchjkugwi6o7rdame
A superstring of a set of strings correspond to a string which contains all the other strings as substrings. The problem of finding the Shortest Linear Superstring is a well-know and well-studied problem in stringology. We present here a variant of this problem, the Shortest Circular Superstring problem where the sought superstring is a circular string. We show a strong link between these two problems and prove that the Shortest Circular Superstring problem is NP-complete. Moreover, we propose a new conjecture on the approximation ratio of the Shortest Circular Superstring problem.Bastien Cazaux, Eric Rivalswork_4smruw72gjchjkugwi6o7rdameWed, 17 Nov 2021 00:00:00 GMTQuantum gravity phenomenology at the dawn of the multi-messenger era – A review
https://scholar.archive.org/work/4lphkuv7o5dbdhdhq27ab26mie
The exploration of the universe has recently entered a new era thanks to the multi-messenger paradigm, characterized by a continuous increase in the quantity and quality of experimental data that is obtained by the detection of the various cosmic messengers (photons, neutrinos, cosmic rays and gravitational waves) from numerous origins. They give us information about their sources in the universe and the properties of the intergalactic medium. Moreover, multi-messenger astronomy opens up the possibility to search for phenomenological signatures of quantum gravity. On the one hand, the most energetic events allow us to test our physical theories at energy regimes which are not directly accessible in accelerators; on the other hand, tiny effects in the propagation of very high energy particles could be amplified by cosmological distances. After decades of merely theoretical investigations, the possibility of obtaining phenomenological indications of Planck-scale effects is a revolutionary step in the quest for a quantum theory of gravity, but it requires cooperation between different communities of physicists (both theoretical and experimental). This review is aimed at promoting this cooperation by giving a state-of-the art account of the interdisciplinary expertise that is needed in the effective search of quantum gravity footprints in the production, propagation and detection of cosmic messengers.A. Addazi, J. Alvarez-Muniz, R. Alves Batista, G. Amelino-Camelia, V. Antonelli, M. Arzano, M. Asorey, J.-L. Atteia, S. Bahamonde, F. Bajardi, A. Ballesteros, B. Baret, D. M. Barreiros, S. Basilakos, D. Benisty, O. Birnholtz, J. J. Blanco-Pillado, D. Blas, J. Bolmont, D. Boncioli, P. Bosso, G. Calcagni, S. Capozziello, J. M. Carmona, S. Cerci, M. Chernyakov, S. Clesse, J. A. B. Coelho, S. M. Colak, J. L. Cortes, S. Das, V. D'Esposito, M. Demirci, M. G. Di Luca, A. di Matteo, D. Dimitrijevic, G. Djordjevic, D. Dominis Prester, A. Eichhorn, J. Ellis, C. Escamilla-Rivera, G. Fabiano, S. A. Franchino-Viñas, A. M. Frassino, D. Frattulillo, S. Funk, A. Fuster, J. Gamboa, A. Gent, L. Á. Gergely, M. Giammarchi, K. Giesel, J.-F. Glicenstein, J. Gracia-Bondía, G. Gubitosi, E. I. Guendelman, I. Gutierrez-Sagredo, L. Haegel, S. Heefer, A. Held, F. J. Herranz, T. Hinderer, J. I. Illana, A. Ioannisian, P. Jetzer, F. R. Joaquim, K.-H. Kampert, A. Karasu Uysal, T. Katori, N. Kazarian, D. Kerszberg, J. Kowalski-Glikman, S. Kuroyanagi, C. Lämmerzahl, J. Levi Said, S. Liberati, E. Lim, I. P. Lobo, M. López-Moya, G.G. Luciano, M. Manganaro, A. Marcianò, P. Martín-Moruno, Manel Martinez, Mario Martinez, H. Martínez-Huerta, P. Martínez-Miravé, M. Masip, D. Mattingly, N. Mavromatos, A. Mazumdar, F. Méndez, F. Mercati, S. Micanovic, J. Mielczarek, A. L. Miller, M. Milosevic, D. Minic, L. Miramonti, V. A. Mitsou, P. Moniz, S. Mukherjee, G. Nardini, S. Navas, M. Niechciol, A. B. Nielsen, N. A. Obers, F. Oikonomou, D. Oriti, C. F. Paganini, S. Palomares-Ruiz, R. Pasechnik, C. Pérez de los Heros, C. Pfeifer, M. P. Pieroni, T. Piran, A. Platania, S. Rastgoo, J. J. Relancio, M. A. Reyes, A. Ricciardone, M. Risse, M. D. Rodriguez Frias, G. Rosati, D. Rubiera-Garcia, H. Sahlmann, M. Sakellariadou, F. Salamida, E. N. Saridakis, P. Satunin, M. Schiffer, F. Schüssler, G. Sigl, J. Sitarek, J. Solà Peracaula, C. F. Sopuerta, T. P. Sotiriou, M. Spurio, D. Staicova, N. Stergioulas, S. Stoica, J. Strišković, T. Stuttard, D. Sunar Cerci, Y. Tavakoli, C.A. Ternes, T. Terzić, T. Thiemann, P. Tinyakov, M. D. C. Torri, M. Tórtola, C. Trimarelli, T. Trześniewski, A. Tureanu, F. R. Urban, E. C. Vagenas, D. Vernieri, V. Vitagliano, J.-C. Wallet, J. D. Zornozawork_4lphkuv7o5dbdhdhq27ab26mieWed, 10 Nov 2021 00:00:00 GMTComplexity, chaos and the moving D3-brane
https://scholar.archive.org/work/v7vqyzrpk5ea7pb325bjptklv4
We use the wave-function method developed in area of quantum information to investigate the quantum circuit complexity of the small quantum fluctuations around the probe D_3 brane moving in AdS_5× S^5 bulk. In our consideration, the reference and target states are chosen as the vacuum state and the squeezed quantum state respectively. The evolution of parameters characterizing the squeezed quantum state are governed by the time-dependent Schrödinger equation, in which the Hamiltonian operator is derived from the perturbative action of D_3 brane. For a quantum chaotic system, some recent works indicate that the evolution of quantum circuit complexity could provide equivalent information like the out-of-time-order correlators. Basing on this inference, our results show that the quantum fluctuations around the non-BPS brane manifestly evolve into the chaotic regime at the late time, while the chaotic behavior is not easy to observe in case of BPS brane. In holographic viewpoint, it implies that the thermodynamic system consist of the N=4 supersymmetric particles in non-BPS states evolve into a chaotic system more easily than the one in BPS state.Ai-chen Liwork_v7vqyzrpk5ea7pb325bjptklv4Fri, 29 Oct 2021 00:00:00 GMTHigher-Spin States of the Superstring in an Electromagnetic Background
https://scholar.archive.org/work/uwz6k2zuejgnve4phqwcdh2muy
Constructing a consistent four-dimensional Lagrangian for charged massive higher-spin fields propagating in an electromagnetic background is an open problem. In 1989, Argyres and Nappi used bosonic open string field theory to construct a Lagrangian for charged massive spin-2 fields in a constant electromagnetic background. In this paper, we use the four-dimensional hybrid formalism for open superstring field theory to construct a supersymmetric Lagrangian for charged massive spin-2 and spin-3/2 fields in a constant electromagnetic background. The hybrid formalism has the advantage over the RNS formalism of manifest 𝒩=1 d=4 spacetime supersymmetry so that the spin-2 and spin-3/2 fields are combined into a single superfield and there is no need for picture-changing or spin fields.Karim Benakli, Nathan Berkovits, Cassiano A. Daniel, Matheus Lizework_uwz6k2zuejgnve4phqwcdh2muyTue, 26 Oct 2021 00:00:00 GMTNon-perturbative aspects of gauge theories from gauge-gravity dualities
https://scholar.archive.org/work/gd46c3bzrbcj7pfd35fmxmfgey
We consider two established supergravities which are known to provide the low-energy effective description of either superstring theory or M-theory: the six-dimensional theory of Romans, and the maximal supergravity in seven dimensions. We compactify on an S^1 and T^2, respectively, to obtain 5D sigma-models coupled to gravity, and spectra of bosonic excitations are computed numerically by fluctuating fields on backgrounds which holographically realise confinement. We propose a method to detect mixing effects between scalar resonances and the pseudo-Nambu–Goldstone boson associated with spontaneous breaking of conformal invariance: the dilaton. This test consists of neglecting a key component of the spin-0 fluctuation variables, effectively disregarding their back-reaction on the underlying geometry; where discrepancies arise compared to the proper calculation we infer dilaton mixing. In both cases this analysis evinces a parametrically light dilaton. For each theory we also uncover a tachyonic instability within their parameter space. We hence proceed to investigate their respective phase structures, reasoning that some mechanism must render the instabilities physically inaccessible. We compile a catalogue of geometrically distinct backgrounds within each theory, and derive general expressions for their holographically renormalised free energy F. Another numerical routine is used to systematically extract data for some special deformation parameters, and F is plotted in units of an appropriate universal scale. Our analysis proves fruitful: each theory shows evidence of a first-order phase transition which induces the spontaneous decompactification of the shrinking dimension before the instability manifests, favouring instead a branch of singular solutions. The light dilaton resonance appears only along a metastable portion of the branch of confining backgrounds.John Roughleywork_gd46c3bzrbcj7pfd35fmxmfgeyFri, 24 Sep 2021 00:00:00 GMT