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2020-11-13
17:36
Function Theory for Multiloop Feynman Integrals / Duhr, Claude
Precise predictions for collider observables require the computation of higher orders in perturbation theory. This usually involves the evaluation of complicated multiloop integrals, which typically give rise to complicated special functions. [...]
CERN-TH-2020-192.- Geneva : CERN, 2020 - 26. - Published in : Annual Review of Nuclear and Particle Science 69 (2019) 15-39 Fulltext: PDF;

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2020-11-03
04:14
Leading-Color Two-Loop QCD Corrections for Three-Photon Production at Hadron Colliders / Abreu, S. (CERN ; UCLA) ; Page, B. (LPENS, Paris) ; Pascual, E. (Freiburg U.) ; Sotnikov, V. (Munich, Max Planck Inst.)
We compute the two-loop helicity amplitudes for the production of three photons at hadron colliders in QCD at leading-color. Using the two-loop numerical unitarity method coupled with analytic reconstruction techniques, we obtain the decomposition of the two-loop amplitudes in terms of master integrals in analytic form. [...]
arXiv:2010.15834; CERN-TH-2020-176; FR-PHENO-2020-016; MPP-2020-190.- 2021-01-14 - 29 p. - Published in : JHEP 2101 (2021) 078 Article from SCOAP3: PDF; Fulltext: PDF;

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2020-10-21
04:31
The Schwarzschild-Tangherlini metric from scattering amplitudes in various dimensions / Mougiakakos, Stavros (IPhT, Saclay) ; Vanhove, Pierre (IPhT, Saclay ; Higher Sch. of Economics, Moscow ; CERN)
We derive the static Schwarzschild-Tangherlini metric by extracting the classical contributions from the multi-loop vertex functions of a graviton emitted from a massive scalar field. At each loop orders the classical contribution is proportional to a unique master integral given by the massless sunset integral. [...]
arXiv:2010.08882; IPhT-t20/053; CERN-TH-2020-168.- 2021-01-05 - 31 p. - Published in : Phys. Rev. D 103 (2021) 026001 Article from SCOAP3: PDF; Fulltext: PDF;

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2020-09-24
04:09
From NANOGrav to LIGO with metastable cosmic strings / Buchmuller, Wilfried (DESY) ; Domcke, Valerie (CERN ; EPFL, Lausanne, LPPC) ; Schmitz, Kai (CERN)
We interpret the recent NANOGrav results in terms of a stochastic gravitational wave background from metastable cosmic strings. The observed amplitude of a stochastic signal can be translated into a range for the cosmic string tension and the mass of magnetic monopoles arising in theories of grand unification. [...]
arXiv:2009.10649; CERN-TH-2020-157; DESY 20-154; DESY-20-154.- 2020-12-10 - 4 p. - Published in : Phys. Lett. B 811 (2020) 135914 Article from SCOAP3: PDF; Fulltext: PDF;

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2020-09-23
04:37
Knitting Wormholes by Entanglement in Supergravity / Balasubramanian, Vijay (Pennsylvania U. ; Vrije U., Brussels ; Intl. Solvay Inst., Brussels) ; Decross, Matthew (Pennsylvania U.) ; Sárosi, Gábor (Pennsylvania U. ; CERN)
We construct a single-boundary wormhole geometry in type IIB supergravity by perturbing two stacks of $N$ extremal D3-branes in the decoupling limit. The solution interpolates from a two-sided planar AdS-Schwarzschild geometry in the interior, through a harmonic two-center solution in the intermediate region, to an asymptotic AdS space. [...]
arXiv:2009.08980; CERN-TH-2020-153.- 2020 - 44 p. - Published in : JHEP 2011 (2020) 167 Article from SCOAP3: PDF; Fulltext: PDF;

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2020-09-17
04:35
Local Primordial Non-Gaussianities and Super-Sample Variance / Castorina, Emanuele (CERN) ; Moradinezhad Dizgah, Azadeh (Geneva U., Dept. Theor. Phys.)
Fluctuations with wavelengths larger than the volume of a galaxy survey affect the measurement of the galaxy power spectrum within the survey itself. In the presence of local Primordial Non- Gaussianities (PNG), in addition to the super-sample matter density and tidal fluctuations, the large-scale gravitational potential also induces a modulation of the observed power spectrum. [...]
arXiv:2005.14677; CERN-TH-2020-083; CERN-TH-2020-083 CERN-TH-2020-083.- 2020-10-02 - 20 p. - Published in : JCAP 2010 (2020) 007 Fulltext: PDF; Fulltext from publisher: PDF;

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2020-09-12
04:31
Multiplicity dependence of (multi-)strange baryons in the canonical ensemble with phase shift corrections / Cleymans, Jean (UCT-CERN Res. Ctr.) ; Lo, Pok Man (Wroclaw U.) ; Redlich, Krzysztof (Wroclaw U. ; CERN) ; Sharma, Natasha (Panjab U.)
The increase in strangeness production with charged particle multiplicity, as seen by the ALICE collaboration at CERN in p-p, p-Pb and Pb-Pb collisions, is investigated in the hadron resonance gas model taking into account interactions among hadrons using S-matrix corrections based on known phase shift analyses. Strangeness conservation is taken into account in the framework of the canonical strangeness ensemble. [...]
arXiv:2009.04844; CERN-TH-2020-141.- 2021-01-20 - 15 p. - Published in : Phys. Rev. C 103 (2021) 014904 Article from SCOAP3: PDF; Fulltext: PDF;

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2020-09-09
04:46
Beware of commonly used approximations : Part II. Estimating systematic biases in the best-fit parameters / Bernal, José Luis ; Bellomo, Nicola ; Raccanelli, Alvise ; Verde, Licia
Cosmological parameter estimation from forthcoming experiments promise to reach much greater precision than current constraints. As statistical errors shrink, the required control over systematic errors increases. [...]
arXiv:2005.09666; CERN-TH-2020-054.- 2020-10-06 - 21 p. - Published in : JCAP 2010 (2020) 017 Fulltext: PDF; External link: GitHub

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2020-09-01
04:02
Universality of ultra-relativistic gravitational scattering / Di Vecchia, Paolo (Bohr Inst. ; Nordita ; Royal Inst. Tech., Stockholm) ; Heissenberg, Carlo (Nordita ; Royal Inst. Tech., Stockholm ; Uppsala U.) ; Russo, Rodolfo (Queen Mary, U. of London) ; Veneziano, Gabriele (CERN ; College de France)
We discuss the ultra-relativistic gravitational scattering of two massive particles at two-loop (3PM) level. We find that in this limit the real part of the eikonal, determining the deflection angle, is universal for gravitational theories in the two derivative approximation. [...]
arXiv:2008.12743; CERN-TH-2020-143; NORDITA 2020-079; QMUL-PH-20-25.- 2020-12-10 - 20 p. - Published in : Phys. Lett. B 811 (2020) 135924 Article from SCOAP3: PDF; Fulltext: PDF;

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2020-09-01
04:02
Correspondence between strings in the Hagedorn phase and asymptotically de Sitter space / Brustein, Ram (Ben Gurion U. of Negev) ; Medved, A.J.M. (Rhodes U. ; NITheP, Matieland)
A correspondence between closed strings in their high-temperature Hagedorn phase and asymptotically de Sitter (dS) space is established. We identify a thermal, conformal field theory (CFT) whose partition function is, on the one hand, equal to the partition function of closed, interacting, fundamental strings in their Hagedorn phase yet is, on the other hand, also equal to the Hartle-Hawking (HH) wavefunction of an asymptotically dS Universe. [...]
arXiv:2005.09321; CERN-TH-2019-156.- 2020-10-07 - 16 p. - Published in : Phys. Rev. D 102 (2020) 086002 Article from SCOAP3: PDF; Fulltext: PDF;

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