Evolution of the Universe to the present inert phase
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology,
12/2010
Journal Article
We express explicitly all parameters of the most general Two-Higgs-Doublet Model (2HDM) scalar potential via measurable ({\it basic}) quantities plus additional parameters specifying the basis ...choice. The full set of basic parameters is partitioned into two groups: the first group can be obtained by measuring all the scalar boson masses and the couplings of two neutrals to gauge bosons.The second group, in contrast, does not affect the masses and Higgs-gauge couplings, and can only be determined from processes involving Higgs self-interactions. These basic quantities can be treated as free parameters of model limited by general enough conditions. Apart from this construction {\em per se}, we also obtain three by-products: new sum rules for relative couplings, a clear possibility of the coexistence of relatively light Higgses with the strong interaction in the Higgs sector, and a restriction on the triple-Higgs coupling in the SM-like regime (the latter - in a separate paper).
The most general Two Higgs Doublet Model (2HDM) allows both for the explicit and the spontaneous CP violation in the scalar sector. Here we discuss CP violation in terms of basis-independent ...quantities and show how using two different sets of known CP-odd weak-basis invariants one can distinguish between CP conservation, explicit CP violation and spontaneous CP violation. The special case of CP violation without CP mixing, in which the neutral Higgs gauge boson interaction respects CP while Higgs self-interaction violates CP symmetry, is also presented.
We assume that current state of the Universe can be described by the Inert Doublet Model, containing two scalar doublets, one of which is responsible for EWSB and masses of particles and the second ...one having no couplings to fermions and being responsible for dark matter. We consider possible evolutions of the Universe to this state during cooling down of the Universe after inflation. We found that in the past Universe could pass through phase states having no DM candidate. In the evolution via such states in addition to a possible EWSB phase transition (2-nd order) the Universe sustained one 1-st order phase transition or two phase transitions of the 2-nd order.
We consider the evolution of the ground state in the Two Higgs Doublet Model during cooling down of the Universe after the Big Bang. Different regions in the space of free parameters of this model ...correspond to different sequences of thermal phase transitions. We discuss different paths of thermal evolution and corresponding evolution of physical properties of the system for different modern values of the parameters.
The two-Higgs-doublet model (2HDM) realizes ground states (vacuum) with different properties for different parameter values. The parameters of the effective potential change during cooling of the ...Universe after the Big Bang. In so doing, the properties of vacuum state can be affected, phase transitions take place. The evolution of phase states and the set of phase transitions can turn out to be much wider than those accounted for within the conventional Standard model (SM) with a single Higgs doublet. The phase history of the Universe is analyzed for any specified set of the 2HDM parameters. All possible variants of the history are considered. Sets of modern, observed, in principle, parameters corresponding to different sequences of thermal phase transitions are determined. Possible cosmological consequences are briefly discussed.
Different vacua in 2HDM Ginzburg, I F; Kanishev, K A
arXiv.org,
01/2008
Paper, Journal Article
Odprti dostop
We discuss the extrema of the Two Higgs Doublet Model with different physical properties. We have found necessary and sufficient conditions for realization of the extrema with different properties as ...the vacuum state of the model. We found explicit equations for extremum energies via parameters of potential if it has explicitly CP conserving form. These equations allow to pick out extremum with lower energy -- vacuum state and to look for change of extrema (phase transitions) with the variation of parameters of potential. Our goal is to find general picture here to apply it for description of early Universe.
It is shown that in reaction \gamma\gamma\to\ell^+\ell^-+\nu's at \sqrt{s}>200 GeV with polarized photons, large and well observable differences arise in the distribution of positive and negative ...charged leptons (\ell=\mu^\pm, e^\pm), (charge asymmetry). The modification due to the contribution of the cascade processes with intermediate \tau-lepton in \gamma \gamma \to W^\pm\ell^\mp + \nu's reaction is taken into account. This charge asymmetry is potentially sensitive to effects of physics beyond the standard model at the anticipated luminosity of the Photon Collider mode of the future international linear collider.
Different vacua in two-Higgs-doublet model
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology,
11/2007
Journal Article
The study of charge asymmetry of W bosons in the process \egam\to eWW can be
a tool for discovery of strong interaction in Higgs sector at energies that are
lower than it is necessary for observation ...of resonances caused by this strong
interaction.
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