CERN Accelerating science

TH Articles

Letzte Einträge:
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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2020-09-24
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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2020-09-17
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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2020-09-09
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 - 10 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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2020-08-29
05:13
Supernova Triggers for End-Devonian Extinctions / Fields, Brian D. (Illinois U., Urbana (main) ; Illinois U., Urbana, Astron. Dept. ; Illinois U., Urbana) ; Melott, Adrian L. (Kansas U.) ; Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Ertel, Adrienne F. ; Fry, Brian J. (U.S. Air Force Academy) ; Lieberman, Bruce S. (U. Kansas, Lawrence) ; Liu, Zhenghai (Illinois U., Urbana (main) ; Illinois U., Urbana, Astron. Dept.) ; Miller, Jesse A. (Illinois U., Urbana (main) ; Illinois U., Urbana, Astron. Dept.) ; Thomas, Brian C. (Washburn U.)
The Late Devonian was a protracted period of low speciation resulting in biodiversity decline, culminating in extinction events near the Devonian-Carboniferous boundary. Recent evidence indicates that the final extinction event may have coincided with a dramatic drop in stratospheric ozone, possibly due to a global temperature rise. [...]
arXiv:2007.01887; CERN-TH-2020-102; CERN-TH-2020-102.- 2020-09-01 - 3 p. - Published in : Proc. Natl. Acad. Sci. U. S. A. 117 (2020) 21008–21010 Fulltext: PDF; Fulltext from publisher: PDF;

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2020-08-27
04:02
String Universality and Non-Simply-Connected Gauge Groups in 8d / Cvetič, Mirjam (Pennsylvania U. ; Maribor U.) ; Dierigl, Markus (Pennsylvania U.) ; Lin, Ling (CERN) ; Zhang, Hao Y. (Pennsylvania U.)
We present a consistency condition for 8d ${\cal N} = 1$ supergravity theories with non-trivial global structure $G/Z$ for the non-Abelian gauge group, based on an anomaly involving the $Z$ 1-form center symmetry. The interplay with other Swampland criteria identifies the majority of 8d theories with gauge group $G/Z$, which have no string theory realization, as inconsistent quantum theories when coupled to gravity. [...]
arXiv:2008.10605; CERN-TH-2020-138; UPR-1306-T.- 2020-11-20 - 6 p. - Published in : Phys. Rev. Lett. 125 (2020) 211602 Article from SCOAP3: PDF; Fulltext: PDF;

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2020-08-20
05:50
Logarithmically enhanced Euler-Heisenberg Lagrangian contribution to the electron gyromagnetic factor / Czarnecki, Andrzej (Alberta U.) ; Piclum, Jan (Siegen U.) ; Szafron, Robert (CERN)
Contrary to what was previously believed, two-loop radiative corrections to the $g$-factor of an electron bound in a hydrogen-like ion at $\mathcal{O}\left(\alpha^2 (Z\alpha)^5\right)$ exhibit logarithmic enhancement. This previously unknown contribution is due to a long-distance light-by-light scattering amplitude. [...]
arXiv:2008.07550; Alberta Thy 2-20; SI-HEP-2020-21; P3H-20-042; CERN-TH-2020-137.- 2020-11-11 - 5 p. - Published in : Phys. Rev. A 102 (2020) 050801 Fulltext: PDF; Fulltext from publisher: PDF;

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2020-08-14
05:07
Large-x resummation of off-diagonal deep-inelastic parton scattering from d-dimensional refactorization / Beneke, Martin (Munich, Tech. U.) ; Garny, Mathias (Munich, Tech. U.) ; Jaskiewicz, Sebastian (Munich, Tech. U.) ; Szafron, Robert (CERN) ; Vernazza, Leonardo (INFN, Turin ; Turin U.) ; Wang, Jian (Shandong U.)
The off-diagonal parton-scattering channels $g+\gamma^*$ and $q+\phi^*$ in deep-inelastic scattering are power-suppressed near threshold $x\to 1$. We address the next-to-leading power (NLP) resummation of large double logarithms of $1-x$ to all orders in the strong coupling, which are present even in the off-diagonal DGLAP splitting kernels. [...]
arXiv:2008.04943; TUM-HEP-1270/20; CERN-TH-2020-135.- 2020-10-29 - 51 p. - Published in : JHEP 2010 (2020) 196 Article from SCOAP3: PDF; Fulltext: PDF;

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