CERN Accelerating science

TH Articles

Darreres entrades:
2020-02-27
04:40
$T\bar T$-deformation and long range spin chains / Pozsgay, Balázs ; Jiang, Yunfeng ; Takács, Gábor
We point out that two classes of deformations of integrable models, developed completely independently, have deep connections and share the same algebraic origin. One class includes the $T\bar T$-deformation of 1+1 dimensional integrable quantum field theory and related solvable irrelevant deformations proposed recently. [...]
arXiv:1911.11118; CERN-TH-2019-200.- 2020-03-16 - 18 p. - Published in : JHEP 2003 (2020) 092 Fulltext: PDF; External link: Fulltext from publisher

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2020-02-21
04:32
Chaotic inflation with four-form couplings / Lee, Hyun Min (Chung-Ang U.)
We consider chaotic inflation models with a pseudo-scalar field containing the general couplings to the four-form flux. The four-form mixing with the pseudo-scalar field induces a quadratic potential for inflaton while the coexisting four-form mixing with graviton generates a non-minimal gravity coupling for inflaton. [...]
arXiv:1908.05475; CERN-TH-2019-228.- 2020-02-20 - 6 p. - Published in : Phys. Rev. D 101 (2020) 043523 Article from SCOAP3: PDF; Fulltext: PDF;

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2020-02-21
04:32
Relaxation of Higgs mass and cosmological constant with four-form fluxes and reheating / Lee, Hyun Min (Chung-Ang U.)
We consider the most general effective action for the four-form fluxes in the Standard Model coupled to gravity. The Higgs mass parameter can be relaxed to a correct value due to the four-form coupling to the Higgs field and it stops changing due to an extremely suppressed transition probability from the observed cosmological constant to AdS space. [...]
arXiv:1908.04252; CERN-PH-TH/2019-196; CERN-TH-2019-196.- 2020-01-08 - 14 p. - Published in : JHEP 2001 (2020) 045 Article from SCOAP3: PDF; Fulltext: PDF;

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2020-01-09
04:55
Tree-level splitting amplitudes for a quark into four collinear partons / Del Duca, Vittorio (Zurich, ETH) ; Duhr, Claude (CERN) ; Haindl, Rayan (Zurich, ETH) ; Lazopoulos, Achilleas (Zurich, ETH) ; Michel, Martin (Louvain U., CP3)
We compute in conventional dimensional regularisation the tree-level splitting amplitudes for a quark parent in the limit where four partons become collinear to each other. This is part of the universal infrared behaviour of the QCD scattering amplitudes at next-to-next-to-next-to-leading order (${\rm N^3LO}$) in the strong coupling constant. [...]
arXiv:1912.06425; CERN-TH-2019-221; CP3-19-57.- 2020-02-28 - 46 p. - Published in : JHEP 2002 (2020) 189 Article from SCOAP3: PDF; Fulltext: PDF; External link: Article from SCOAP3

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2020-01-07
04:04
Three-loop contributions to the $\rho$ parameter and iterated integrals of modular forms / Abreu, Samuel (Louvain U., CP3) ; Becchetti, Matteo (Louvain U., CP3) ; Duhr, Claude (CERN) ; Marzucca, Robin (Durham U., IPPP)
We compute fully analytic results for the three-loop diagrams involving two different massive quark flavours contributing to the $\rho$ parameter in the Standard Model. We find that the results involve exactly the same class of functions that appears in the well-known sunrise and banana graphs, namely elliptic polylogarithms and iterated integrals of modular forms. [...]
arXiv:1912.02747; CERN-TH-2019-210; CP3-19-53; IPPP/19/90.- 2020-02-07 - 38 p. - Published in : JHEP 2002 (2020) 050 Article from SCOAP3: PDF; Fulltext: PDF; External link: Article from SCOAP3

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2020-01-04
05:03
Electroweak baryogenesis at high wall velocities / Cline, James M. (McGill U.) ; Kainulainen, Kimmo (Jyvaskyla U. ; Helsinki Inst. of Phys. ; CERN)
It is widely believed that electroweak baryogenesis should be suppressed in strong phase transitions with fast-moving bubble walls, but this effect has never been quantitatively studied. We rederive fluid equations describing transport of particle asymmetries near the bubble wall without making the small-wall-velocity approximation. [...]
arXiv:2001.00568; CERN-TH-2019-227.- 2020-03-20 - 16 p. - Published in : Phys. Rev. D 101 (2020) 063525 Fulltext: PDF; Fulltext from publisher: PDF;

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2019-12-18
04:45
Primordial backgrounds of relic gravitons / Giovannini, Massimo (CERN ; INFN, Milan Bicocca)
The diffuse backgrounds of relic gravitons with frequencies ranging between the aHz band and the GHz region encode the ultimate information on the primeval evolution of the plasma and on the underlying theory of gravity well before the electroweak epoch. While the temperature and polarization anisotropies of the microwave background radiation probe the low-frequency tail of the graviton spectra, during the next score year the pulsar timing arrays and the wide-band interferometers (both terrestrial and hopefully space-borne) will explore a much larger frequency window encompassing the nHz domain and the audio band. [...]
arXiv:1912.07065; CERN-TH-2019-166.- 2020-03-04 - 148 p. - Published in : 10.1016/j.ppnp.2020.103774 Fulltext: PDF; Fulltext from publisher: PDF;

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2019-12-17
04:15
de Sitter Conjectures in N=1 Supergravity / Ferrara, Sergio (CERN ; INFN, Milan Bicocca) ; Tournoy, Magnus (Leuven U.) ; Van Proeyen, Antoine (Leuven U.)
Supergravity theories at D=4 allow to formulate the Swampland de Sitter conjectures in the complex field space of scalar components of chiral multiplets. We formulate the de Sitter and refined de Sitter conjecture by using the K\"ahler invariant ${\cal G}$-function and explore a class of models in the Landscape/Swampland scenario which obey and/or violate such conjectures. [...]
arXiv:1912.06626; CERN-TH-2019-220.- 2020-02-01 - 18 p. - Published in : Fortschr. Phys. 68 (2020) 1900107 Fulltext: PDF;

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2019-12-17
04:15
Diagrammatic Coaction of Two-Loop Feynman Integrals / Abreu, Samuel (Louvain U., CP3) ; Britto, Ruth (Hamilton Math. Inst., Dublin ; Trinity Coll., Dublin ; IPhT, Saclay) ; Duhr, Claude (CERN) ; Gardi, Einan (U. Edinburgh, Higgs Ctr. Theor. Phys. ; Edinburgh U., Inst. Astron.) ; Matthew, James (U. Edinburgh, Higgs Ctr. Theor. Phys.)
It is known that one-loop Feynman integrals possess an algebraic structure encoding some of their analytic properties called the coaction, which can be written in terms of Feynman integrals and their cuts. This diagrammatic coaction, and the coaction on other classes of integrals such as hypergeometric functions, may be expressed using suitable bases of differential forms and integration contours. [...]
arXiv:1912.06561; CERN-TH-2019-218; CP3-19-59.- 2020 - 10 p. - Published in : PoS RADCOR2019 (2019) 065 Fulltext: PoS(RADCOR2019)065 - PDF; 1912.06561 - PDF;
In : 14th International Symposium on Radiative Corrections : Application of Quantum Field Theory to Phenomenology, Avignon, France, 8 - 13 Sep 2019, pp.065

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2019-12-17
04:14
Gluon Radiation from a classical point particle II: dense gluon fields / Kajantie, K. (Helsinki U.) ; McLerran, Larry D. (Washington U., Seattle) ; Paatelainen, Risto (Helsinki U. ; CERN)
The goal of this paper is to extend the results of Ref. [1], where formulae were derived for gluonic radiation for a high energy nucleus colliding with a classical colored particle. [...]
arXiv:1911.12738; CERN-TH-2019-201; HIP-2019-37/TH; INT-PUB-19.- 2020-03-11 - 18 p. - Published in : Phys. Rev. D 101 (2020) 054012 Fulltext: PDF; Published fulltext: PDF;

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