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2021-04-27
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; CERN-TH-2021-066.- 2021-04-23 - 41 p. - Published in : 10.1016/j.ppnp.2021.103865 Fulltext: PDF;

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2021-02-25
04:20
Semi-automated BSM model building procedures in MARTY-1.1 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 one-loop 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; CERN-TH-2021-025.- 2021-02-23 - 14 p. - Published in : PoS: TOOLS2020 (2020) , pp. 042 Fulltext: PDF;
In : Tools for High Energy Physics and Cosmology, Lyon, France, 2 - 6 Nov 2020, pp.042

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2021-01-20
04:01
Black hole quasinormal modes and isospectrality in Deser-Woodard nonlocal gravity / Chen, Che-Yu (Taiwan, Inst. Phys.) ; Park, Sohyun (CERN)
We investigate the gravitational perturbations of the Schwarzschild black hole in the nonlocal gravity model recently proposed by Deser and Woodard (DW-II). The analysis is performed in the localized version in which the nonlocal corrections are represented by some auxiliary scalar fields. [...]
arXiv:2101.06600; CERN-TH-2021-011.- 2021-03-19 - 10 p. - Published in : Phys. Rev. D 103 (2021) 064029 Fulltext: PDF; Fulltext from Publisher: PDF; Fulltext from publisher: PDF;

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2021-01-15
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 axion-like 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; DESY-21-006; CERN-TH-2021-010.- 2021-05-03 - 18 p. - Published in : JHEP 2105 (2021) 001 Fulltext: PDF; Fulltext from publisher: PDF;

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2021-01-15
04:01
The Schwarzian sector of higher spin CFTs / Datta, Shouvik (CERN)
Two-dimensional conformal field theories with Virasoro symmetry generically contain a Schwarzian sector. This sector is related to the near-horizon region of the near-extremal BTZ black hole in the holographic dual. [...]
arXiv:2101.04980; CERN-TH-2021-009.- 2021-04-19 - 22 p. - Published in : JHEP 2104 (2021) 171 Article from SCOAP3: PDF; Fulltext: PDF;

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2021-01-12
04:25
Hawking radiation by spherically-symmetric 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 spherically-symmetric and static metrics. We then compute the short-ranged 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; CERN-TH-2021-007.- 2021-05-08 - 17 p. - Published in : Phys. Rev. D 103 (2021) 104010 Fulltext: PDF; Fulltext from publisher: PDF;

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2020-12-26
04:32
Geometrizing non-relativistic bilinear deformations / Hansen, Dennis (ETH, Zurich (main)) ; Jiang, Yunfeng (CERN ; Southeast U., Nanjing) ; Xu, Jiuci (UC, Santa Barbara ; USTC, Hefei)
We define three fundamental solvable bilinear deformations for any massive non-relativistic 2d quantum field theory (QFT). They include the $\mathrm{T}\overline{\mathrm{T}}$ deformation and the recently introduced hard rod deformation. [...]
arXiv:2012.12290; CERN-TH-2020-221.- 2021-04-20 - 43 p. - Published in : JHEP 2104 (2021) 186 Article from SCOAP3: PDF; Fulltext: PDF;

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2020-12-26
04:32
Searching for New Physics with $B^{0} \to K^{*0} \mu^+ \mu^-$ / Neshatpour, S. (IP2I, Lyon) ; Hurth, T. (U. Mainz, PRISMA) ; Mahmoudi, F. (IP2I, Lyon ; CERN)
One of the main indications for New Physics in rare $B$-decays is deduced from the tension between experimental and Standard Model predictions of the angular analysis of the $B^0 \to K^{*0} \mu^+\mu^-$ decay. There are however possible non-local hadronic effects which in principle can also explain these tensions. [...]
arXiv:2012.07408; CERN-TH-2020-210.- SISSA, 2021-02-22 - 6 p. - Published in : PoS: ICHEP2020 (2021) , pp. 406
Fulltext: PoS(ICHEP2020)406 - PDF; 2012.07408 - PDF;
In : 40th International Conference on High Energy Physics (ICHEP), Prague, Czech Republic, 28 Jul - 6 Aug 2020, pp.406

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2020-12-19
04:31
Dark Matter, Destroyer of Worlds: Neutrino, Thermal, and Existential Signatures from Black Holes in the Sun and Earth / Acevedo, Javier F. (Queen's U., Kingston) ; Bramante, Joseph (Queen's U., Kingston ; Perimeter Inst. Theor. Phys.) ; Goodman, Alan (Queen's U., Kingston) ; Kopp, Joachim (CERN ; Mainz U., Inst. Phys. ; U. Mainz, PRISMA) ; Opferkuch, Toby (CERN)
Dark matter can be captured by celestial objects and accumulate at their centers, forming a core of dark matter that can collapse to a small black hole, provided that the annihilation rate is small or zero. If the nascent black hole is big enough, it will grow to consume the star or planet. [...]
arXiv:2012.09176; CERN-TH-2020-209; MITP/20-081.- 2021-04-09 - 44 p. - Published in : JCAP 2104 (2021) 026 Fulltext: PDF;

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2020-12-19
04:31
Searching for Lepton Flavour (Universality) Violation and Collider Signals from a Singly-Charged Scalar Singlet / Crivellin, Andreas (CERN ; Zurich U. ; PSI, Villigen) ; Kirk, Fiona (Zurich U. ; PSI, Villigen) ; Manzari, Claudio Andrea (Zurich U. ; PSI, Villigen) ; Panizzi, Luca (Uppsala U.)
In recent years, evidence for lepton flavour universality violation beyond the Standard Model has been accumulated. In this context, a singly charged $SU(2)_L$ singlet scalar ($\phi^\pm$) is very interesting, as it can only have flavour off-diagonal couplings to neutrinos and charged leptons, therefore necessarily violating lepton flavour (universality). [...]
arXiv:2012.09845; CERN-TH-2020-213; PSI-PR-20-24; UZ-TH 55/20.- 2021-04-15 - 8 p. - Published in : Phys. Rev. D 103 (2021) 073002 Article from SCOAP3: PDF; Fulltext: PDF;

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