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TH Articles

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2014-11-25
12:23
New Higgs Inflation in a No-Scale Supersymmetric SU(5) GUT / Ellis, John (Trinity Coll., Dublin ; CERN) ; He, Hong-Jian (Tsinghua U., Beijing, CHEP ; Peking U., CHEP) ; Xianyu, Zhong-Zhi (Tsinghua U., Beijing, CHEP ; Peking U., CHEP)
Higgs inflation is attractive because it identifies the inflaton with the electroweak Higgs boson. In this work, we construct a new class of supersymmetric Higgs inflationary models in the no-scale supergravity with an SU(5) GUT group. [...]
arXiv:1411.5537; KCL-PH-TH-2014-48; LCTS-2014-49; CERN-PH-TH-2014-230.- 2015 - Published in : Phys. Rev. D 91 (2015) 021302 Fulltext: PDF; External link: Preprint

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2014-11-06
08:31
Approach to equilibrium in weakly coupled nonabelian plasmas / Kurkela, Aleksi (CERN) ; Lu, Egang (McGill U.)
We follow the time evolution of nonabelian gauge bosons from far-from-equilibrium initial conditions to thermal equilibrium by numerically solving an effective kinetic equation that becomes accurate in the weak coupling limit. We consider initial conditions that are either highly overoccupied or underoccupied. [...]
arXiv:1405.6318; CERN-PH-TH-2014-093.- 2014 - 6 p. - Published in : Phys. Rev. Lett. 113 (2014) 182301 APS published version, local copy: PDF; Fulltext: PDF; External link: Preprint

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2014-11-04
07:37
TEK twisted gradient flow running coupling / Pérez, Margarita García (Madrid, Autonoma U. ; Madrid, IFT) ; González-Arroyo, Antonio (Madrid, IFT ; Madrid, Autonoma U.) ; Keegan, Liam (CERN) ; Okawa, Masanori (Hiroshima U. (main))
We measure the running of the twisted gradient flow coupling in the Twisted Eguchi-Kawai (TEK) model, the SU(N) gauge theory on a single site lattice with twisted boundary conditions in the large N limit..
arXiv:1411.0258; CERN-PH-TH-2014-210; IFT-UAM-CSIC-14-114; HUPD-1409; FTUAM-14-47.- 2014 - 7 p. Fulltext: PDF; External link: Preprint

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2014-10-17
07:43
Global fits to b -> s ll data and signs for lepton non-universality / Hurth, T (U. Mainz, PRISMA ; Mainz U., Inst. Phys.) ; Mahmoudi, F (CERN ; IUF, Paris ; Lyon U. ; Lyon Observ. ; Lyon, Ecole Normale Superieure) ; Neshatpour, S (IPM, Tehran)
There are some slight tensions with the SM predictions within the latest LHCb measurements. Besides the known anomaly in one angular observable of the rare decay B -> K* mu+ mu-, another small discrepancy recently occurred. [...]
arXiv:1410.4545; CERN-PH-TH-2014-198; MITP-14-078.- 2014 - 15 p. - Published in : J. High Energy Phys. 12 (2014) 053 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2014-10-02
07:59
Lattice gauge theory without link variables / Vairinhos, Helvio (Zurich, ETH ; Porto U.) ; de Forcrand, Philippe (Zurich, ETH ; CERN)
We obtain a sequence of alternative representations for the partition function of pure SU(N) or U(N) lattice gauge theory with the Wilson plaquette action, using the method of Hubbard-Stratonovich transformations. In particular, we are able to integrate out all the link variables exactly, and recast the partition function of lattice gauge theory as a Gaussian integral over auxiliary fields..
arXiv:1409.8442; CERN-PH-TH-2014-186.- 2014 - 5 p. - Published in : J. High Energy Phys. 12 (2014) 038 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2014-10-02
07:56
Natural Braneworld Inflation in Light of Recent Results from Planck and BICEP2 / Neupane, Ishwaree P (CERN ; Canterbury U. ; Tribhuvan U., Kathmandu)
In this paper we report on a major theoretical observation in cosmology. We present a concrete cosmological model for which inflation has natural beginning and natural ending. [...]
arXiv:1409.8647; CERN-PH-TH-2014-189.- 2014 - 22 p. - Published in : Phys. Rev. D 90 (2014) 123502 Fulltext: PDF; External link: Preprint

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2014-09-17
07:54
Exact correlation functions in SU(2) N=2 superconformal QCD / Baggio, Marco (Zurich, ETH) ; Niarchos, Vasilis (Crete U.) ; Papadodimas, Kyriakos (CERN ; U. Groningen (main))
We report an exact solution of 2- and 3-point functions of chiral primary fields in SU(2) N=2 super-Yang-Mills theory coupled to four hypermultiplets. It is shown that these correlation functions are non-trivial functions of the gauge coupling, obeying differential equations which take the form of the semi-infinite Toda chain. [...]
arXiv:1409.4217; CCTP-2014-18; CCQCN-2014-42; CERN-PH-TH-2014-177.- 2014 - 5 p. - Published in : Phys. Rev. Lett. 113 (2014) 251601 Fulltext: PDF; External link: Preprint

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2014-09-10
07:35
Ambient cosmology and spacetime singularities / Antoniadis, Ignatios (Ecole Polytechnique, CPHT) ; Cotsakis, Spiros (CERN ; Aegean U.)
We present a new approach to the issues of spacetime singularities and cosmic censorship in general relativity. This is based on the idea that standard 4-dimensional spacetime is the conformal infinity of an ambient metric for the 5-dimensional Einstein equations with fluid sources. [...]
arXiv:1409.2220; CERN-PH-TH-2014-176.- 2015 - 17 p. - Published in : Eur. Phys. J. C 75 (2015) 35 Fulltext: PDF; External link: Preprint

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2014-09-08
07:25
A Cheap Alternative to the Lattice? / Hogervorst, Matthijs (CERN ; Ecole Normale Superieure) ; Rychkov, Slava (CERN ; Ecole Normale Superieure ; UPMC, Paris (main)) ; van Rees, Balt C (CERN ; Ecole Normale Superieure)
We show how to perform accurate, nonperturbative and controlled calculations in quantum field theory in d dimensions. We use the Truncated Conformal Space Approach (TCSA), a Hamiltonian method which exploits the conformal structure of the UV fixed point. [...]
arXiv:1409.1581; CERN-PH-TH-2014-155.- 2015 - 56 p. - Published in : Phys. Rev. D 91 (2015) 025005 Fulltext: PDF; External link: Preprint

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2014-09-02
07:23
Cosmic backgrounds of relic gravitons and their absolute normalization / Giovannini, Massimo (INFN, Milan Bicocca ; CERN)
Provided the consistency relations are not violated, the recent Bicep2 observations pin down the absolute normalization, the spectral slope and the maximal frequency of the cosmic graviton background produced during inflation. The properly normalized spectra are hereby computed from the lowest frequencies (of the order of the present Hubble rate) up to the highest frequency range in the GHz region. [...]
arXiv:1405.6301; CERN-PH-TH-2014-096.- 2014 - 29 p. - Published in : Class. Quantum Gravity 31 (2014) 225002 Fulltext: PDF; External link: Preprint

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