Cosmological constraints on an invisibly decaying Higgs

Bento, M. C.; Bertolami, Orfeu; Rosenfeld, R.

doi:10.1016/s0370-2693(01)01078-4

Cited by 109 publications

(82 citation statements)

References 31 publications

(33 reference statements)

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“…(20) Thus, for Higgs masses in the range 115 GeV to 1 TeV and with expansion rate h ഠ 0.7, the upper bound on l S from requiring that V S & 0.3 is in the range ͑1.4 3 10 210 3.6 3 10 29 ͒h 21͞3 . This is in broad agreement with the upper bound estimated in [24], based on the weaker condition that the S scalars do not come into thermal equilibrium. More importantly, we see that it is possible to generate a thermal relic density with V S ഠ 0.3 and m S ഠ 10 MeV (typical of SIDM scalars) purely within the minimal gauge singlet scalar extension of the standard model.…”

supporting

confidence: 91%

“…It has recently been noted that gauge singlet scalars have a natural self-interaction via an S 4 -type coupling and so in principle could account for SIDM [23][24][25]. An estimate of the upper bound on the coupling of S scalars to the Higgs doublets for S mass of the order of 10 100 MeV (which is of the greatest interest in the case of perturbative S self-interactions) was derived in [24] by requiring that S scalars do not come into thermal equilibrium and so overpopulate the Universe.…”

mentioning

confidence: 99%

“…An estimate of the upper bound on the coupling of S scalars to the Higgs doublets for S mass of the order of 10 100 MeV (which is of the greatest interest in the case of perturbative S self-interactions) was derived in [24] by requiring that S scalars do not come into thermal equilibrium and so overpopulate the Universe.…”

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confidence: 99%

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Thermally Generated Gauge Singlet Scalars as Self-Interacting Dark Matter

2002

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We show that a gauge singlet scalar S, with a coupling to the Higgs doublet of the form l S S y SH y H and with the S mass entirely generated by the Higgs expectation value, has a thermally generated relic density V S ഠ 0.3 if m S ഠ ͑2.9 10.5͒ ͑V S ͞0. [3,4]. Observationally, the density profile of galaxies in the inner few kiloparsecs appears to be much shallower than predicted by numerical simulations (the central density of dark matter halos being 50 times smaller than the CCDM prediction for dwarf galaxies and roughly independent of halo mass [2,5]), while the number of dwarf galaxies in the local group is an order of magnitude fewer than predicted [3,4]. In addition, the CCDM predictions for the Tully-Fisher relation [6,7] and the stability of galactic bars in high surface brightness spiral galaxies [8] are not in agreement with what is observed, indicating lower density galaxy cores than predicted by CCDM. Although there is at present considerable uncertainty regarding the interpretation of observations and simulations [9,10], it has nevertheless been argued that all the discrepancies between observations and simulations may be understood as indicating that dark matter halos in CCDM simulations are more centrally concentrated than observed [11].In order to overcome the possible deficiencies of CCDM halos, one suggestion has been that the cold dark matter particles have a nondissipative self-interaction [12,13], and it has been shown that such cold, nondissipative selfinteracting dark matter (SIDM) can be effective in alleviating the various problems of CCDM [11]. Scattering of dark matter particles stops gravitational accretion at the center of the halo and so allows a smooth core to form. Simulations with SIDM [11,14] are able to simultaneously account for the observed density profiles of galactic halos and the number of subhalos [11]. In the future SIDM may be strongly constrained by gravitational lensing observations of the shape of cluster halos [15][16][17] and by the formation of massive black holes at the centers of galaxies, which is enhanced by self-interactions of dark matter particles [18].In order to be able to account for the observed properties of dark matter halos, the requirement on the mass M and

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confidence: 91%

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Thermally Generated Gauge Singlet Scalars as Self-Interacting Dark Matter

2002

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“…In our simple model we couple the additional scalar to the Standard Model through a Higgs portal [72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91] added to the effective potential of eq. (2.6),…”

Section: Jhep04(2015)022mentioning

confidence: 99%

The Higgs mass and the scale of new physics

Eichhorn

Gies

Jaeckel

et al. 2015

J. High Energ. Phys.

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In view of the measured Higgs mass of 125 GeV, the perturbative renormalization group evolution of the Standard Model suggests that our Higgs vacuum might not be stable. We connect the usual perturbative approach and the functional renormalization group which allows for a straightforward inclusion of higher-dimensional operators in the presence of an ultraviolet cutoff. In the latter framework we study vacuum stability in the presence of higher-dimensional operators. We find that their presence can have a sizable influence on the maximum ultraviolet scale of the Standard Model and the existence of instabilities. Finally, we discuss how such operators can be generated in specific models and study the relation between the instability scale of the potential and the scale of new physics required to avoid instabilities.

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“…In typical examples one takes here the R-parity in the MSSM and assumes the dark matter particles to be the LSP. However the above-mentioned O(N) symmetry would do as well [22,23]. For inflation one typically takes a singlet field, that has no particular symmetry.…”

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confidence: 99%

The minimal non-minimal standard model

Bij

2006

Physics Letters B

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In this letter I discuss a class of extensions of the standard model that have a minimal number of possible parameters, but can in principle explain dark matter and inflation. It is pointed out that the so-called new minimal standard model contains a large number of parameters that can be put to zero, without affecting the renormalizability of the model. With the extra restrictions one might call it the minimal (new) non minimal standard model (MNMSM). A few hidden discrete variables are present. It is argued that the inflaton should be higher-dimensional. Experimental consequences for the LHC and the ILC are discussed.With the latest developments from high energy colliders like LEP and the Tevatron the standard model (SM) has been established up to the loop level. Precision measurements leave only very little space for extensions, as these tend to spoil the agreement with experiment due to a variety of effects, one of the most important of which is the appearance of flavor-changing neutral currents. Even the most popular extension, namely the minimal supersymmetric extension of the SM has to finely tune a number of parameters. This leaves only one type of extensions that are safe, namely the singlet extensions. Experimentally right handed neutrinos appear to exist. Since these are singlets a natural extension of the SM is the existence of singlet scalars too [1][2][3][4][5][6][7][8][9]. These will only have a very limited effect on radiative corrections, since they appear only in two-loop calculations [10,11].The effects of singlets appear in two forms, one is the mixing with the SM Higgs, the other is the possibility of invisible decay. In contrast to charged fields these effects can be separated. It is actually possible to have a Higgs model that has only Higgs-mixing. If one starts with an interaction of the form HΦ † Φ, where H is the new singlet Higgs field and Φ the SM Higgs field, no interaction of the form H 3 or H 4 is generated with an infinite coefficient [1].

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Cosmological constraints on an invisibly decaying Higgs

Cited by 109 publications

References 31 publications

Thermally Generated Gauge Singlet Scalars as Self-Interacting Dark Matter

Thermally Generated Gauge Singlet Scalars as Self-Interacting Dark Matter

The Higgs mass and the scale of new physics

The minimal non-minimal standard model

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