CERN Accelerating science

TH Articles

Ultimi arrivi:
2022-03-19
08:55
Non-minimally assisted chaotic inflation / Hyun, Sang Chul (Yonsei U. ; IPAP, Seoul) ; Kim, Jinsu (CERN) ; Park, Seong Chan (Yonsei U. ; Korea Inst. Advanced Study, Seoul) ; Takahashi, Tomo (Saga U., Japan)
Conventional wisdom says that a chaotic inflation model with a power-law potential is ruled out by the recent Planck-BICEP/Keck results. We find, however, that the model can be assisted by a non-minimally coupled scalar field and still provides a successful inflation. [...]
arXiv:2203.09201; YHEP-COS22-01; KIAS-P22015; CERN-TH-2022-040.- 2022-05-31 - 14 p. - Published in : JCAP 2205 (2022) 045 Fulltext: document - PDF; 2203.09201 - PDF;

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2022-03-16
04:13
Leveraging universality of jet taggers through transfer learning / Dreyer, Frédéric A. (Oxford U., Theor. Phys.) ; Grabarczyk, Radosław (Oxford U., Theor. Phys.) ; Monni, Pier Francesco (CERN)
A significant challenge in the tagging of boosted objects via machine-learning technology is the prohibitive computational cost associated with training sophisticated models. Nevertheless, the universality of QCD suggests that a large amount of the information learnt in the training is common to different physical signals and experimental setups. [...]
arXiv:2203.06210; OUTP-22-01P; CERN-TH-2022-018.- 2022-06-25 - 11 p. - Published in : Eur. Phys. J. C 82 (2022) 564 Fulltext: PDF; Fulltext from publisher: PDF;

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2022-03-08
04:09
Scaling and adiabaticity in a rapidly expanding gluon plasma / Brewer, Jasmine (CERN) ; Scheihing-Hitschfeld, Bruno (MIT, Cambridge, CTP) ; Yin, Yi (Lanzhou, Inst. Modern Phys.)
In this work we aim to gain qualitative insight on the far-from-equilibrium behavior of the gluon plasma produced in the early stages of a heavy-ion collision. It was recently discovered arXiv:1810.10554 that the distribution functions of quarks and gluons in QCD effective kinetic theory (EKT) exhibit self-similar "scaling" evolution with time-dependent scaling exponents long before those exponents reach their pre-hydrodynamic fixed-point values. [...]
arXiv:2203.02427; CERN-TH-2022-026; MIT-CTP/5411.- 2022-05-23 - 38 p. - Published in : JHEP 2205 (2022) 145 Fulltext: 2203.02427 - PDF; document - PDF;

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2022-03-08
04:02
Gravitational portals with nonminimal couplings / Clery, Simon (IJCLab, Orsay) ; Mambrini, Yann (IJCLab, Orsay ; CERN) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.) ; Shkerin, Andrey (Minnesota U., Theor. Phys. Inst.) ; Verner, Sarunas (Minnesota U., Theor. Phys. Inst.)
We consider the effects of non-minimal couplings to curvature of the form $\xi_S S^2 R$, for three types of scalars: the Higgs boson, the inflaton, and a scalar dark matter candidate. We compute the abundance of dark matter produced by these non-minimal couplings to gravity and compare to similar results with minimal couplings. [...]
arXiv:2203.02004; UMN--TH--4116/22; FTPI--MINN--22/07; CERN-TH-2022-025.- 2022-05-01 - 14 p. - Published in : Phys. Rev. D 105 (2022) 095042 Fulltext: PhysRevD.105.095042 - PDF; 2203.02004 - PDF;

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2022-03-08
04:02
Stability analysis of nonthermal fixed points in longitudinally expanding kinetic theory / Mikheev, Aleksandr N. (Kirchhoff Inst. Phys. ; U. Heidelberg, ITP) ; Mazeliauskas, Aleksas (CERN) ; Berges, Jürgen (U. Heidelberg, ITP)
We use the Hamiltonian formulation of kinetic theory to perform a stability analysis of nonthermal fixed points in a non-Abelian plasma. We construct a perturbative expansion of the Fokker-Planck collision kernel in an adiabatic approximation and show that the (next-to-)leading order solutions reproduce the known nonthermal fixed point scaling exponents. [...]
arXiv:2203.02299; CERN-TH-2022-030.- 2022-06-01 - 10 p. - Published in : Phys. Rev. D 105 (2022) 116025 Fulltext: PDF; Fulltext from publisher: PDF;

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2022-03-02
04:22
A Two-Component Dark Matter Model and its Associated Gravitational Waves / Costa, Francesco (Gottingen U.) ; Khan, Sarif (Gottingen U.) ; Kim, Jinsu (CERN)
We consider an extension of the Standard Model that accounts for the muon $g-2$ tension and neutrino masses and study in detail dark matter phenomenology. The model under consideration includes a WIMP and a FIMP scalar dark matter candidates and thus gives rise to two-component dark matter scenarios. [...]
arXiv:2202.13126; CERN-TH-2022-022.- 2022-06-06 - 28 p. - Published in : JHEP 2206 (2022) 026 Fulltext: 2202.13126 - PDF; document - PDF;

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2022-02-22
04:12
Models with (broken) $\mathbb{Z}$$_{2}$ symmetries / Robens, Tania (Boskovic Inst., Zagreb ; CERN)
I discuss the allowed parameter space as well as collider prospects of several new physics models containing (broken) $\mathbb{Z}$$_{2}$ symmetries. I focus on effects of current constraints on these, and touch on several future collider options..
arXiv:2202.09636; RBI-ThPhys-2022-05; CERN-TH-2022-019.- 2022-03-03 - 6 p. - Published in : PoS DISCRETE2020-2021 (2022) 063 Fulltext: document - PDF; 2202.09636 - PDF;
In : 7th Symposium on Prospects in the Physics of Discrete Symmetries, Bergen, Norway, 29 Nov - 3 Dec 2021, pp.063

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2022-02-14
09:08
RG-induced modulus stabilization: perturbative de Sitter vacua and improved D3-$ \overline{\mathrm{D}3} $ inflation / Burgess, C.P. (McMaster U. ; Perimeter Inst. Theor. Phys. ; CERN) ; Quevedo, F. (Cambridge U., DAMTP)
We propose a new mechanism that adapts to string theory a perturbative method for stabilizing moduli without leaving the domain of perturbative control, thereby evading the `Dine-Seiberg' problem. The only required nonperturbative information comes from the standard renormalization-group resummation of leading logarithms that allow us simultaneously to work to a fixed order in the perturbative parameter $\alpha$ and to all orders in $\alpha \ln\tau$ where $\tau$ is a large extra-dimensional modulus. [...]
arXiv:2202.05344; CERN-TH-2022-009.- 2022-06-30 - 46 p. - Published in : JHEP 2206 (2022) 167 Fulltext: 2202.05344 - PDF; document - PDF;

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2022-02-04
04:13
Gegenbauer's Twin / Durieux, Gauthier (CERN) ; McCullough, Matthew (CERN) ; Salvioni, Ennio (U. Padua, Dept. Phys. Astron. ; INFN, Padua)
In Twin Higgs models the dominant source of fine-tuning is the cancellation of order $v^2/f^2$ required to obtain a Standard Model-like Higgs, where $v$ and $f$ are the electroweak and new physics scales, respectively. Recently proposed Gegenbauer Goldstone models naturally realise $v^2/f^2 \ll 1$ and hence remove this source of fine-tuning. [...]
arXiv:2202.01228; CERN-TH-2022-012.- 2022-05-20 - 7 p. Fulltext: document - PDF; 2202.01228 - PDF;

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2022-01-21
04:06
Singlet channel scattering in a Composite Higgs model on the lattice / Drach, Vincent (Plymouth U.) ; Fritzsch, Patrick (Plymouth U. ; Trinity Coll., Dublin) ; Rago, Antonio (Plymouth U. ; CERN) ; Romero-López, Fernando (Valencia U., IFIC)
We present the first calculation of the scattering amplitude in the singlet channel beyond QCD. The calculation is performed in $SU(2)$ gauge theory with $N_f=2$ fundamental Dirac fermions and based on a finite-volume scattering formalism. [...]
arXiv:2107.09974; CERN-TH-2021-221.- 2022-01-19 - 10 p. - Published in : Eur. Phys. J. C 82 (2022) 47 Fulltext: document - PDF; 2107.09974 - PDF;

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