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(295) Production(s) de l'année 2019
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End of cosmic growth
Auteur(s): Linder Eric V., Polarski D.
(Article) Publié:
Physical Review D, vol. 99 p.023503 (2019)
Texte intégral en Openaccess :
Ref HAL: hal-01914524_v1
Ref Arxiv: 1810.10547
Ref INSPIRE: 1700428
DOI: 10.1103/PhysRevD.99.023503
WoS: 000454769300005
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
4 Citations
Résumé: The growth of large scale structure is a battle between gravitational attraction and cosmic acceleration. We investigate the future behavior of cosmic growth under both general relativity (GR) and modified gravity during prolonged acceleration, deriving analytic asymptotic behaviors and showing that gravity generally loses and growth ends. We also note that the “why now” problem is equally striking when viewed in terms of the shutdown of growth. For many models inside GR the gravitational growth index γ also shows today as a unique time between constant behavior in the past and a higher asymptotic value in the future. Interestingly, while f(R) models depart in this respect dramatically from GR today and in the recent past, their growth indices are identical in the asymptotic future and past.
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Mass spectrum of gapped, non-confining theories with multi-scale dynamics
Auteur(s):
(Article) Publié:
Journal Of High Energy Physics, vol. 05 p.175 (2019)
Texte intégral en Openaccess :
Ref HAL: hal-01902860_v1
Ref Arxiv: 1810.04656
Ref INSPIRE: 1697706
DOI: 10.1007/JHEP05(2019)175
WoS: 000469456900002
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
2 Citations
Résumé: We study the mass spectrum of spin-0 and spin-2 composite states in a one-parameter family of three-dimensional field theories by making use of their dual descriptions in terms of supergravity. These theories exhibit a mass gap despite being non-confining, and by varying a parameter can be made to flow arbitrarily close to an IR fixed point corresponding to the Ooguri-Park conformal field theory. At the opposite end of parameter space, the dynamics becomes quasi-confining. The glueball spectrum interpolates between these two limiting cases and, for nearly conformal dynamics, approaches the result of the Ooguri-Park theory deformed by both sources and VEVs. In order to elucidate under which circumstances quasi-conformal dynamics leads to the presence of a light pseudo-dilaton, we perform a study of the dependence of the spectrum on the position of a hard-wall IR cutoff and find that, in the present case, the mass of such state is lifted by deep-IR effects.
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Black holes and higher depth mock modular forms
Auteur(s): Alexandrov S., Pioline Boris
(Article) Publié:
Communications In Mathematical Physics, vol. 374 p.549–625 (2019)
Texte intégral en Openaccess :
Ref HAL: hal-01852413_v2
Ref Arxiv: 1808.08479
DOI: 10.1007/s00220-019-03609-y
WoS: 000527910200005
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: By enforcing invariance under S-duality in type IIB string theory compactified on a Calabi-Yau threefold, we derive modular properties of the generating function of BPS degeneracies of D4-D2-D0 black holes in type IIA string theory compactified on the same space.Mathematically, these BPS degeneracies are the generalized Donaldson-Thomas invariants counting coherent sheaves with support on a divisor$\cal D$ , at the large volume attractor point. For $\cal D$ irreducible, this function is closely related to the elliptic genus of the superconformal field theory obtained by wrapping M5-brane on $\cal D$ and is therefore known to be modular. Instead, when $\cal D$ is the sum of $n$ irreducible divisors ${\cal D}_i$, we show that the generating function acquires a modular anomaly. We characterize this anomaly for arbitrary $n$ by providing an explicit expression for a non-holomorphic modular completion in terms of generalized error functions. As a result, the generating function turns out to be a (mixed) mock modular form of depth $n−1$.
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FRT presentation of classical Askey–Wilson algebras
Auteur(s): Baseilhac Pascal, Crampé N.
(Article) Publié:
Letters In Mathematical Physics, vol. 109 p.2187–2207 (2019)
Texte intégral en Openaccess :
Ref HAL: hal-02152774_v1
Ref Arxiv: 1806.07232
DOI: 10.1007/s11005-019-01182-y
WoS: 000484976800002
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
4 Citations
Résumé: Automorphisms of the infinite dimensional Onsager algebra are introduced. Certain quotients of the Onsager algebra are formulated using a polynomial in these automorphisms. In the simplest case, the quotient coincides with the classical analog of the Askey-Wilson algebra. In the general case, generalizations of the classical Askey-Wilson algebra are obtained. The corresponding class of solutions of the non-standard classical Yang-Baxter algebra are constructed, from which a generating function of elements in the commutative subalgebra is derived. We provide also another presentation of the Onsager algebra and of the classical Askey-Wilson algebras.
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Attractor flow trees, BPS indices and quivers
Auteur(s): Alexandrov S., Pioline Boris
(Article) Publié:
-Adv.theor.math.phys., vol. 23 p.627-699 (2019)
Texte intégral en Openaccess :
Ref HAL: hal-01781942_v1
Ref Arxiv: 1804.06928
Ref INSPIRE: 1668938
DOI: 10.4310/ATMP.2019.v23.n3.a2
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: Inspired by the split attractor flow conjecture for multi-centered black hole solutions in $N = 2$ supergravity, we propose a formula expressing the BPS index $\Omega (\gamma , z)$ in terms of ‘attractor indices’ $\Omega_{\ast} (\gamma_i)$. The latter count BPS states in their respective attractor chamber. This formula expresses the index as a sum over stable flow trees weighted by products of attractor indices. We show how to compute the contribution of each tree directly in terms of asymptotic data, without having to integrate the attractor flow explicitly. Furthermore, we derive new representations for the index which make it manifest that discontinuities associated to distinct trees cancel in the sum, leaving only the discontinuities consistent with wall-crossing. We apply these results in the context of quiver quantum mechanics, providing a new way of computing the Betti numbers of quiver moduli spaces, and compare them with the Coulomb branch formula, clarifying the relation between attractor and single-centered indices.
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Driven transport on a flexible polymer with particle recycling: A model inspired by transcription and translation
Auteur(s): Dias fernandes Lucas, Ciandrini L.
(Article) Publié:
Physical Review E, vol. 99 p.052409 (2019)
Texte intégral en Openaccess :
Ref HAL: hal-01743450_v1
Ref Arxiv: 1803.08110
DOI: 10.1103/PhysRevE.99.052409
WoS: WOS:000469026300012
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
2 Citations
Résumé: Many theoretical works have attempted to coarse grain gene expression at the level of transcription and translation via frameworks based on exclusion processes. Usually in these models the three-dimensional conformation of the substrates (DNA and mRNA) is neglected, and particles move on a static unidimensional lattice in contact to an infinite reservoir. In this work we generalise the paradigmatic exclusion process and study the transport of particles along a unidimensional polymer-like flexible lattice immersed in a three-dimensional particle reservoir. We study the recycling of particles in the reservoir, how the transport is influenced by the conformation of the lattice and, in turn, how particle density dictates the structure of the polymer.
Commentaires: 5 pages, 4 figures
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Transistor Magnétique à effet de champ à gaz d’électrons bidimensionnel, dispositif et procédé associés
Auteur(s): Raymond A., Chaubet C.
Brevet: #WO2019002453A1, (2019)
Ref HAL: hal-01705324_v1
Exporter : BibTex | endNote
Résumé: le M-TEGFET, est un nouveau type de transistor, sans grille, fonctionnant grâce à un effet magnétique.
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