The fine tuning of the cosmological constant in a conformal model

Jain, Pankaj; Kashyap, Gopal; Mitra, Subhadip

doi:10.1142/s0217751x15501717

Cited by 8 publications

(7 citation statements)

References 98 publications

(194 reference statements)

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“…The astrophysical implications of this conformal model have been studied earlier in [25]. It has also been argued that due to conformal symmetry this model does not suffer from the fine tuning problem of the cosmological constant [16,17]. This demonstration requires use of a dynamical regulator which preserves conformal symmetry in the full quantum theory.…”

Section: Review Of the Conformal Modelmentioning

confidence: 92%

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Cosmological dark matter in a conformal model

et al. 2019

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We study the collider, astrophysical and cosmological constraints on the dark matter sector of a conformal model. The model has a dark sector with strong self interactions. This sector couples weakly with the Standard Model (SM) particles via a scalar messenger. The lightest dark sector particle is a pion-like fermion anti-fermion bound state. We find that the model successfully satisfies the constraints coming from the Higgs decay to the visible as well as the invisible sector. The dark matter relic density is explained by the freeze-out mechanism. We have used the results of the dark matter direct detection experiments, such as, XENON1T in order to impose bounds on the parameters of the model. The model also satisfies the indirect detection constraints of gamma ray from the galactic center and Dwarf spheroidal galaxies. * psanyal@iitk.ac.in † alekha@prl.res.in ‡

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Section: Review Of the Conformal Modelmentioning

confidence: 92%

“…In this paper we consider a conformal model discussed earlier [13,14,15,16,17]. This model has self interacting dark matter sector which is assumed to have a QCD like dynamics.…”

Section: Introductionmentioning

confidence: 99%

Cosmological dark matter in a conformal model

et al. 2019

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“…The action now becomes The conformal symmetry may be broken softly by the dynamical mechanism analogous to the one described in Refs. [61][62][63][64][65]. Here one assumes the existence of a dark strongly coupled sector.…”

Section: Generalized Gravitational Actionmentioning

confidence: 99%

Torsion driven inflationary magnetogenesis

2020

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We show that the breaking of the conformal invariance of the electromagnetic Lagrangian, which is required for inflationary magnetogenesis, arises naturally in the Poincaré gauge theory. We use the minimal coupling prescription to introduce the electromagnetic gauge fields as well as non-Abelian gauge fields in this theory. Due to the addition of non-Abelian gauge fields, we show that the solar constraints on this model can be naturally evaded. We find that in the minimal version of this model the generated magnetic field is too small to explain the observations. We discuss some generalizations of the gravitational action, including the Starobinsky model and a model with conformal invariance. We show that such generalizations naturally generate the kinetic energy terms required for magnetogenesis. We propose a generalization of the minimal model by adding a potential term, which is allowed within the framework of this model, and show that it leads to sufficiently large magnetic fields.

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“…However, the cosmological constant can be generated when the scale invariance is broken cosmologically [10]. Cosmological constant is constrained by the scale symmetry and hence it might solve the fine tuning problem associated with cosmological constant [12,13]. Once the symmetry is broken, the other dimensionful parameter such as gravitational constant is also generated [10].…”

Section: Introductionmentioning

confidence: 99%

“…Some works related to removal of anomaly in conformal invariance and applications of conformal invariance have been discussed in Refs. [10][11][12][13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Local Scale Invariance and Inflation

Singh¹,

Panda

2018

JPP

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We study the inflation and the cosmological perturbations generated during the inflation in a local scale invariant model. The local scale invariant model introduces a vector field Sµ in this theory. In this paper, for simplicity, we consider the temporal part of the vector field St. We show that the temporal part is associated with the slow roll parameter of scalar field. We consider a cosmological solution which provides sufficient number of e-foldings for the inflation. Finally, we estimate the power spectrum of scalar perturbation in terms of the parameters of the theory.

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The fine tuning of the cosmological constant in a conformal model

Cited by 8 publications

References 98 publications

Cosmological dark matter in a conformal model

Cosmological dark matter in a conformal model

Torsion driven inflationary magnetogenesis

Local Scale Invariance and Inflation

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