Scalar potential

About: Scalar potential is a research topic. Over the lifetime, 3642 publications have been published within this topic receiving 78868 citations. The topic is also known as: potential.

Spectator field models in light of spectral index after Planck

Abstract: We revisit spectator field models including curvaton and modulated reheating scenarios, specifically focusing on their viability in the new Planck era, based on the derived expression for the spectral index in general spectator field models. Importantly, the recent Planck observations give strong preference to a red-tilted power spectrum, while the spectator field models tend to predict a scale-invariant one. This implies that, during inflation, either (i) the Hubble parameter varies significantly as in chaotic inflation, or (ii) a scalar potential for the spectator field has a relatively large negative curvature. Combined with the tight constraint on the non-Gaussianity, the Planck data provides us with rich implications for various spectator field models.

Wake potentials of a relativistic current in a cavity

Abstract: The wake potential of a bunch of charged particles is required for the calculation of energy loss and beam stability in high-energy particle accelerators or storage rings. Exact solutions for the wake potential are only known for closed cylindrical cavities, and can be obtained either by mode analysis or in the time domain. The equivalence of these analytic solutions, as well as the good agreement with numerical methods, shows that there is no 4l. missing scalar potential" in the mode analysis, as had been suspected before. The mode analysis can be generalized to cavities of arbitrary shape when the resonant frequencies and loss parameters are known for each mode.

Charting the phase diagram of QCD3

Abstract: We study the phase diagram of SU (N) gauge theory in three space-time dimensions with a Chern-Simons term at level k, coupled to two sets of fundamental fermions with masses m1 and m2, respectively. The two-dimensional phase diagram that we propose shows a rich structure and widens in an interesting way previous results in the literature, to which it reduces in some limits. We present several checks of our proposal, including consistency with boson/fermion dualities. In this respect, we extensively comment on the structure of the scalar potential which is needed on the bosonic side of the duality.

Large Higgs-electron Yukawa coupling in 2HDM

Abstract: The present upper bound on κe, the ratio between the electron Yukawa coupling and its Standard Model value, is of $$ \mathcal{O}(600) $$ . We ask what would be the implications in case that κe is close to this upper bound. The simplest extension that allows for such enhancement is that of two Higgs doublet models (2HDM) without natural flavor conservation. In this framework, we find the following consequences: (i) Under certain conditions, measuring κe and κV would be enough to predict values of Yukawa couplings for other fermions and for the H and A scalars. (ii) In the case that the scalar potential has a softly broken Z2 symmetry, the second Higgs doublet must be light, but if there is hard breaking of the symmetry, the second Higgs doublet can be much heavier than the electroweak scale and still allow the electron Yukawa coupling to be very different from its SM value. (iii) CP must not be violated at a level higher than $$ \mathcal{O}\left(0.01/{\kappa}_e\right) $$ in both the scalar potential and the Yukawa sector. (iv) LHC searches for e+e− resonances constrain this scenario in a significant way. Finally, we study the implications for models where one of the scalar doublets couples only to the first generation, or only to the third generation.