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Observational constraints on successful model of quintessential Inflation
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abstract
We study quintessential inflation using a generalized exponential potential $V(\phi)\propto exp(-\lambda \phi^n/Mpl^n), n>1$, the model admits slow-roll inflation at early times and leads to close-to-scaling behaviour in the post inflationary era with an exit to dark energy at late times. We present detailed investigations of the inflationary stage in the light of the Planck 2015 results, study post-inflationary dynamics and analytically confirm the existence of an approximately scaling solution. Additionally, assuming that standard massive neutrinos are non-minimally coupled, makes the field $\phi$ dominant once again at late times giving rise to present accelerated expansion of the Universe. We derive observational constraints on the field and time-dependent neutrino masses. In particular, for $n=6 (8)$, the parameter $\lambda$ is constrained to be,$\log \lambda > -7.29 (-11.7)$; the model produces the spectral index of the power spectrum of primordial scalar (matter density) perturbations as $ n_s = 0.959 \pm 0.001 (0.961 \pm 0.001)$ and tiny tensor-to-scalar ratio, $r<1.72 \times 10^{-2} (2.32 \times 10^{-2})$ respectively. Consequently, the upper bound on possible values of the sum of neutrino masses $\Sigma m_{\nu} \lesssim 2.5$ eV significantly enhances compared to that in the standard $\Lambda$CDM model.
Forward citations
Cited by 8 Pith papers
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Cosmological Constraints on Neutrino Masses in Quintessential Inflation
In the α-attractor quintessential-inflation scenario, Planck PR4 + DESI DR2 BAO + Pantheon+ supernova data imply Σmν < 0.067 eV (flat) and <0.116 eV (with curvature).
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Scaling solutions in quintessential inflation
In quintessential inflation, the scalar field misses the scaling-solution attractor during radiation, so a single exponential tail can drive both inflation and dark energy.
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Mass Varying Neutrino Oscillation in Teleparallel Gravity
Torsion-coupled scalar in teleparallel gravity induces density-dependent neutrino masses that alter MSW resonance and yield constraints on coupling parameters from Super-Kamiokande, Borexino and SNO data.
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Forecasting constraints on quintessential inflation from future generation of galaxy and CMB surveys
Future CMB and galaxy surveys are forecast to constrain the alpha-attractor quintessential inflation parameter to alpha = 2 ± 0.17 and the spectral index to n_s = 0.965 ± 0.0014.
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Inflationary Phenomenology of Einstein Gauss-Bonnet Gravity Compatible with GW170817
Einstein Gauss-Bonnet inflation can have gravitational wave speed equal to light speed and can match Planck 2018 data when the scalar-GB coupling satisfies \ddotξ = H\dotξ and the potential is a tuned power law.
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Baryogenesis in the paradigm of quintessential inflation
Quintessential inflation can generate the observed baryon asymmetry through a derivative coupling of the inflaton to a non-conserved baryon current, at the price of a carefully chosen cutoff scale.
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The Wave Function of the Universe and Inflation
Rearranging the Wheeler-DeWitt equation defines the inflaton potential in terms of an arbitrary wave-function phase and amplitude; nothing constrains that wave function, so the potential is relabeled rather than deriv...
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The Scale Factor Potential Approach to Inflation
The paper reparametrizes slow-roll inflation through a scale factor potential and constructs an example potential, but the chosen 60 e-fold branch is inconsistent with its own first-minimum end condition.
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