20210529 08:49 
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20210427 04:52 
Dark matter and the early Universe: a review
/ Arbey, A. (IP2I, Lyon ; CERN ; IUF, Paris) ; Mahmoudi, F. (IP2I, Lyon ; CERN ; IUF, Paris)
Dark matter represents currently an outstanding problem in both cosmology and particle physics. In this review we discuss the possible explanations for dark matter and the experimental observables which can eventually lead to the discovery of dark matter and its nature, and demonstrate the close interplay between the cosmological properties of the early Universe and the observables used to constrain dark matter models in the context of new physics beyond the Standard Model..
arXiv:2104.11488; CERNTH2021066.
202107  41 p.
 Published in : Prog. Part. Nucl. Phys. 119 (2021) 103865
Fulltext: PDF;

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20210422 11:42 
Nonabelian infrared divergences on the celestial sphere
/ Magnea, Lorenzo (CERN ; INFN, Turin ; Turin U.)
We consider the infrared factorisation of nonabelian multiparticle scattering amplitudes, and we study the form of the universal colour operator responsible for infrared divergences, when expressed in terms of coordinates on the `celestial sphere' intersecting the future lightcone at asymptotic distances. We find that colourdipole contributions to the infrared operator, to all orders in perturbation theory, have a remarkably simple expression in these coordinates, with scale and coupling dependence factorised from kinematics and colour. [...]
arXiv:2104.10254; CERNTH2021063.
20210531  28 p.
 Published in : JHEP 2105 (2021) 282
Article from SCOAP3: PDF; Fulltext: PDF;

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20210317 04:47 
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20210225 04:20 
Semiautomated BSM model building procedures in MARTY1.1 through a 2HDM example
/ Uhlrich, G. (IP2I, Lyon) ; Mahmoudi, F. (IP2I, Lyon ; CERN) ; Arbey, A. (IP2I, Lyon ; CERN ; IUF, Paris)
MARTY is a C++ computer algebra system specialized for High Energy Physics that can calculate amplitudes, squared amplitudes and Wilson coefficients in a large variety of beyond the Standard Model scenarios up to the oneloop order. It is fully independent of any other framework and its main development guideline is generality, in order to be adapted easily to any type of model. [...]
arXiv:2102.11551; CERNTH2021025.
SISSA, 20210510  14 p.
 Published in : PoS TOOLS2020 (2020) 042
Fulltext: 2102.11551  PDF; PoS(TOOLS2020)042  PDF;
In : Tools for High Energy Physics and Cosmology, Lyon, France, 2  6 Nov 2020, pp.042

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20210120 04:01 
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20210116 04:01 
Radiation Reaction from Soft Theorems
/ 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)
Radiation reaction (RR) terms at the third postMinkowskian (3PM) order have recently been found to be instrumental in restoring smooth continuity between the nonrelativistic, relativistic, and ultrarelativistic (including the massless) regimes. Here we propose a new and intriguing connection between RR and soft (bremsstrahlung) theorems which shortcircuits the more involved conventional loop computations. [...]
arXiv:2101.05772; CERNTH2021008; NORDITA 2021001; QMULPH2103; UUITP03/21.
20210710  17 p.
 Published in : Phys. Lett. B 818 (2021) 136379
Article from SCOAP3: PDF; Fulltext: PDF;

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20210115 04:01 
Axion assisted Schwinger effect
/ Domcke, Valerie (CERN ; EPFL, Lausanne, LPPC) ; Ema, Yohei (DESY) ; Mukaida, Kyohei (CERN)
We point out an enhancement of the pair production rate of charged fermions in a strong electric field in the presence of time dependent classical axionlike background field, which we call axion assisted Schwinger effect. While the standard Schwinger production rate is proportional to $\exp(\pi(m^2+p_T^2 )/E)$, with $m$ and $p_T$ denoting the fermion mass and its momentum transverse to the electric field $E$, the axion assisted Schwinger effect can be enhanced at large momenta to $\exp(\pi m^2/E)$. [...]
arXiv:2101.05192; DESY21006; CERNTH2021010.
20210503  18 p.
 Published in : JHEP 2105 (2021) 001
Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from publisher: PDF;

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20210115 04:01 
The Schwarzian sector of higher spin CFTs
/ Datta, Shouvik (CERN)
Twodimensional conformal field theories with Virasoro symmetry generically contain a Schwarzian sector. This sector is related to the nearhorizon region of the nearextremal BTZ black hole in the holographic dual. [...]
arXiv:2101.04980; CERNTH2021009.
20210419  22 p.
 Published in : JHEP 2104 (2021) 171
Article from SCOAP3: PDF; Fulltext: PDF;

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20210112 04:25 
Hawking radiation by sphericallysymmetric static black holes for all spins: Teukolsky equations and potentials
/ Arbey, Alexandre (IP2I, Lyon ; CERN ; IUF, Paris) ; Auffinger, Jérémy (IP2I, Lyon) ; Geiller, Marc (Lyon, Ecole Normale Superieure) ; Livine, Etera R. (Lyon, Ecole Normale Superieure) ; Sartini, Francesco (Lyon, Ecole Normale Superieure)
In the context of the dynamics and stability of black holes in modified theories of gravity, we derive the Teukolsky equations for massless fields of all spins in general sphericallysymmetric and static metrics. We then compute the shortranged potentials associated with the radial dynamics of spin 1 and spin 1/2 fields, thereby completing the existing literature on spin 0 and 2. [...]
arXiv:2101.02951; CERNTH2021007.
20210508  17 p.
 Published in : Phys. Rev. D 103 (2021) 104010
Fulltext: PDF; Fulltext from Publisher: PDF; Fulltext from publisher: PDF;

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