Results 21 to 30 of about 465 (109)
The hand-made tail: non-perturbative tails from multifield inflation
Journal of High Energy Physics, 2022 It is becoming increasingly clear that large but rare fluctuations of the primordial curvature field, controlled by the tail of its probability distribution, could have dramatic effects on the current structure of the universe — e.g. via primordial black-
Ana Achúcarro +3 more
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Advances in Mathematical Physics, Volume 2021, Issue 1, 2021., 2021 In this work, we study a plate equation with time delay in the velocity, frictional damping, and logarithmic source term. Firstly, we obtain the local and global existence of solutions by the logarithmic Sobolev inequality and the Faedo‐Galerkin method. Moreover, we prove the stability and nonexistence results by the perturbed energy and potential well
Hazal Yüksekkaya +5 more
wiley +1 more source
A novel solution to the gravitino problem
Journal of High Energy Physics, 2023 In a general phenomenological model with local supersymmetry, the amount of massive gravitinos produced in early universe tends to violate the known dark matter density bound by many orders of magnitude.
Yu-Cheng Qiu, S.-H. Henry Tye
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Journal of High Energy Physics, 2022 We investigate both the null energy condition (NEC) violating scenario and the c T -diminishing scenario for generating enhanced power spectrum of primordial gravitational waves (GWs) during inflation, where c T is the propagating speed of primordial GWs.
Yong Cai, Yun-Song Piao
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Probing Scalar and Pseudoscalar Solutions to the g − 2 Anomaly
Advances in High Energy Physics, Volume 2020, Issue 1, 2020., 2020 I investigate a class of models with scalar and pseudoscalar solutions to the g − 2 anomaly for both the muon and the electron over the mass range of perturbativity (mϕ≲50 GeV), with Yukawa couplings proportional to the lepton’s mass. In particular, I investigate the constraints from BaBar, beam dump experiments, Z decay measured quantities, LEP mono‐γ
Fayez Abu-Ajamieh, Antonio J. Accioly
wiley +1 more source
Cosmological constraints on dark scalar
Journal of High Energy Physics, 2022 We discuss cosmological constraints on a dark scalar particle mixing with the Standard Model Higgs boson. We pay particular attention to the dark scalar production process when the reheating temperature of the Universe is very low, which allows us to ...
Masahiro Ibe +3 more
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Journal of Function Spaces, Volume 2020, Issue 1, 2020., 2020 The current paper deals with the proof of a global solution of a viscoelasticity singular one‐dimensional system with localized frictional damping and general source terms, taking into consideration nonlocal boundary condition. Moreover, similar to that in Boulaaras’ recent studies by constructing a Lyapunov functional and use it together with the ...
Salah Mahmoud Boulaaras +4 more
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Global Existence of Solutions for the Viscoelastic Kirchhoff Equation with Logarithmic Source Terms
Complexity, Volume 2020, Issue 1, 2020., 2020 In this paper, a nonlinear viscoelastic Kirchhoff equation in a bounded domain with a time‐varying delay term and logarithmic nonlinearity in the weakly nonlinear internal feedback is considered, where the global and local existence of solutions in suitable Sobolev spaces by means of the energy method combined with Faedo‐Galerkin procedure is proved ...
Nadia Mezouar +3 more
wiley +1 more source
Bouncing cosmology in modified gravity with higher-order curvature terms
Journal of High Energy Physics, 2023 A bouncing scenario of a flat homogeneous and isotropic universe is explored by using the reconstruction technique for the power-law parametrization of the Hubble parameter in a modified gravity theory with higher-order curvature and trace of the energy ...
J. K. Singh +3 more
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Full higher-dimensional analysis of moduli oscillation and radiation in expanding universe
Journal of High Energy Physics, 2023 We investigate effects of the radiation and the moduli oscillation around the stabilized values on the evolution of a 6-dimensional spacetime compactified on S 2.
Hajime Otsuka, Yutaka Sakamura
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