CERN Accelerating science

TH Articles

Последние добавления:
2014-08-19
07:40
Gravity and axions from a random UV QFT / Kiritsis, Elias (CERN ; APC, Paris ; Crete U.)
It is postulated that the UV QFT is enormous and random. The coupling of the Standard Model to such QFT is analyzed. [...]
arXiv:1408.3541; CCTP-2014-14; CERN-PH-TH-2014-153.- 2014 - 39 p. - Published in : EPJ Web Conf. 71 (2014) 00068 Fulltext: PDF; External link: Preprint

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2014-06-10
11:11
Extended Mean Field study of complex $\phi^4$-theory at finite density and temperature / Akerlund, Oscar (Zurich, ETH) ; de Forcrand, Philippe (Zurich, ETH ; CERN) ; Georges, Antoine (Ecole Polytechnique, CPHT ; College de France ; U. Geneva (main)) ; Werner, Philipp (Fribourg U.)
We review the Extended Mean Field Theory (EMFT) approximation and apply it to complex, scalar $\phi^4$-theory on the lattice. We study the critical properties of the Bose condensation driven by a nonzero chemical potential $\mu$ at both zero and nonzero temperature and determine the $(T,\mu)$ phase diagram. [...]
arXiv:1405.6613; CERN-PH-TH-2014-091.- 2014 - 10 p. - Published in : Phys. Rev. D 90 (2014) 065008 Fulltext: PDF; External link: Preprint

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2014-05-20
05:30
N=2 Heterotic-Type II duality and bundle moduli / Alexandrov, Sergei (Montpellier U. ; CNRS, France) ; Louis, Jan (U. Hamburg, Dept. Phys. ; Hamburg U., Dept. Math.) ; Pioline, Boris (CERN ; Paris, LPTHE) ; Valandro, Roberto (ICTP, Trieste ; INFN, Trieste)
Heterotic string compactifications on a $K3$ surface $\mathfrak{S}$ depend on a choice of hyperk\"ahler metric, anti-self-dual gauge connection and Kalb-Ramond flux, parametrized by hypermultiplet scalars. The metric on hypermultiplet moduli space is in principle computable within the $(0,2)$ superconformal field theory on the heterotic string worldsheet, although little is known about it in practice. [...]
arXiv:1405.4792; CERN-PH-TH-2014-084; L2C:14-036; ZMP-HH-14-11.- 2014 - 20 p. - Published in : J. High Energy Phys. 08 (2014) 092 External link: Preprint

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2014-05-20
05:30
Statistics of initial density perturbations in heavy ion collisions and their fluid dynamic response / Floerchinger, Stefan (CERN) ; Wiedemann, Urs Achim (CERN)
An interesting opportunity to determine thermodynamic and transport properties in more detail is to identify generic statistical properties of initial density perturbations. Here we study event-by-event fluctuations in terms of correlation functions for two models that can be solved analytically. [...]
arXiv:1405.4393; CERN-PH-TH-2014-092.- 2014 - 35 p. - Published in : J. High Energy Phys. 08 (2014) 005 External link: Preprint

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2014-04-29
15:20
A No-Scale Inflationary Model to Fit Them All / Ellis, John (King's Coll. London ; CERN) ; Garcia, Marcos (Minnesota U., Theor. Phys. Inst.) ; Nanopoulos, Dimitri (Texas A-M ; HARC, Woodlands ; Athens Academy) ; Olive, Keith (Minnesota U., Theor. Phys. Inst.)
The magnitude of B-mode polarization in the cosmic microwave background as measured by BICEP2 favours models of chaotic inflation with a quadratic $m^2 \phi^2/2$ potential, whereas data from the Planck satellite favour a small value of the tensor-to-scalar perturbation ratio $r$ that is highly consistent with the Starobinsky $R + R^2$ model. Reality may lie somewhere between these two scenarios. [...]
arXiv:1405.0271; KCL-PH-TH-2014-18; LCTS-2014-18; ACT-5-14; UMN-TH-3335-14; FTPI-MINN-14-12; CERN-PH-TH-2014-076.- Geneva : CERN, 2014 - 25 p. - Published in : J. Cosmol. Astropart. Phys. 08 (2014) 044 IOP Open Access article: PDF; External link: Fulltext

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2014-04-24
09:42
Probing nuclear rates with Planck and BICEP2 / Di Valentino, Eleonora (Rome U. ; INFN, Rome) ; Gustavino, Carlo (INFN, Rome) ; Lesgourgues, Julien (IPT, Lausanne ; CERN ; Annecy, LAPTH) ; Mangano, Gianpiero (INFN, Naples) ; Melchiorri, Alessandro (Rome U. ; INFN, Rome) ; Miele, Gennaro (Naples U. ; INFN, Naples) ; Pisanti, Ofelia (Naples U. ; INFN, Naples)
Big Bang Nucleosynthesis (BBN) relates key cosmological parameters to the primordial abundance of light elements. In this paper, we point out that the recent observations of Cosmic Microwave Background anisotropies by the Planck satellite and by the BICEP2 experiment constrain these parameters with such a high level of accuracy that the primordial deuterium abundance can be inferred with remarkable precision. [...]
arXiv:1404.7848; CERN-PH-TH-2014-071; LAPTH-027-14.- 2014 - 10 p. - Published in : Phys. Rev. D 90 (2014) 023543 External link: Preprint

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2014-04-08
05:05
New directions for top quark polarization in the $t$-channel process / Aguilar-Saavedra, Juan Antonio (Granada U., Theor. Phys. Astrophys. ; CERN) ; Amor dos Santos, Susana (LIP, Coimbra)
We define three orthogonal axes to investigate the top quark polarization in the $t$-channel single top process. We provide expressions for the polarization in these axes in terms of anomalous $Wtb$ couplings. [...]
arXiv:1404.1585; CERN-PH-TH-2014-086.- Geneva : CERN, 2014 - 6 p. - Published in : Phys. Rev. D 89 (2014) 114009 APS published version, local copy: PDF; Fulltext: PDF; External link: Preprint

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2014-04-02
04:34
Towards precise predictions for Higgs-boson production in the MSSM / Bagnaschi, E (Paris, LPTHE ; UPMC, Paris (main) ; Paris U., IV) ; Harlander, R V (Wuppertal U.) ; Liebler, S (U. Hamburg (main)) ; Mantler, H (CERN) ; Slavich, P (Paris U., IV ; UPMC, Paris (main) ; Paris, LPTHE) ; Vicini, A (Milan U. ; INFN, Milan)
We study the production of scalar and pseudoscalar Higgs bosons via gluon fusion and bottom-quark annihilation in the MSSM. Relying on the NNLO-QCD calculation implemented in the public code SusHi, we provide precise predictions for the Higgs-production cross section in six benchmark scenarios compatible with the LHC searches. [...]
arXiv:1404.0327; CERN-PH-TH-2014-048; DESY 14-040; IFUM 1024-FT; LPN14-061; MCNET-14-07; WUB-14-01.- 2014 - 62 p. - Published in : J. High Energy Phys. 06 (2014) 167 External link: Preprint

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2014-03-20
04:39
From scale invariance to Lorentz symmetry / Sibiryakov, Sergey (CERN ; IPT, Lausanne ; Moscow, INR)
It is shown that a unitary translationally invariant field theory in (1+1) dimensions satisfying isotropic scale invariance, standard assumptions about the spectrum of states and operators and the requirement that signals propagate with finite velocity possesses an infinite dimensional symmetry given by one or a product of several copies of conformal algebra. In particular, this implies presence of one or several Lorentz groups acting on the operator algebra of the theory..
arXiv:1403.4742; CERN-PH-TH-2014-039; INR-TH-2014-006.- 2014 - 5 p. - Published in : Phys. Rev. Lett. 112 (2014) 241602 APS published version, local copy: PDF; External link: Preprint

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2014-03-19
06:50
Emergent Time and the M5-Brane / Hull, C M (Imperial Coll., London) ; Lambert, N (King's Coll. London, Dept. Math)
We consider the maximal super-Yang-Mills theory in 5 Euclidean dimensions with SO(5) R-symmetry and 16 supersymmetries. We argue that the strong coupling limit of this theory (with a possible UV completion) has an emergent time dimension and gives a description of the 5+1 dimensional Lorentz invariant (2,0) theory of the M5-brane, compactified on a timelike circle with radius R=g^2/4\pi^2 . [...]
arXiv:1403.4532; IMPERIAL-TP-2014-CMH-01; CERN-PH-TH-2013-019; KCL-MTH-14-04.- 2014 - 41 p. - Published in : J. High Energy Phys. 06 (2014) 016 External link: Preprint

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