Cosmic information, the cosmological constant and the amplitude of primordial perturbations

@article{Padmanabhan2017CosmicIT,
  title={Cosmic information, the cosmological constant and the amplitude of primordial perturbations},
  author={Thanu Padmanabhan and Hamsa Padmanabhan},
  journal={Physics Letters B},
  year={2017},
  volume={773},
  pages={81-85}
}

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References

SHOWING 1-10 OF 28 REFERENCES

Cosmological Constant from the Emergent Gravity Perspective

Observations indicate that our universe is characterized by a late-time accelerating phase, possibly driven by a cosmological constant $\Lambda$, with the dimensionless parameter $\Lambda L_P^2

The Atoms Of Space, Gravity and the Cosmological Constant

I describe an approach which connects classical gravity with the quantum microstructure of spacetime. The field equations arise from maximizing the density of states of matter plus geometry. The

CosMIn: THE SOLUTION TO THE COSMOLOGICAL CONSTANT PROBLEM

The current acceleration of the universe can be modeled in terms of a cosmological constant Λ. We show that the extremely small value of , the holy grail of theoretical physics, can be understood in

Fluctuations at the threshold of classical cosmology

It is proposed that the initial conditions of galaxy formation are metric fluctuations at the threshold epoch of classical cosmology, and the evidence in favor of this theory is (i) the density fluctuation obeys the n=23 rule, and (ii) the spin fluctuation gives an eventual angular momentum of the order N43ℏ, in reasonable agrement with that of the Galaxy.

Making inflation work: Damping of density perturbations due to Planck energy cutoff.

This paper compute the power spectrum of density perturbations directly from vacuum fluctuations of the ''time-time'' component of the energy-momentum tensor, and compute the inhomogeneous part of the correlation function for a massless minimally coupled scalar field in de Sitter space.

Cosmology without inflation

We propose a new cosmological paradigm in which our observed expanding phase is originated from an initially large contracting Universe that subsequently experienced a bounce. This category of

Initial state of matter fields and trans-Planckian physics: Can CMB observations disentangle the two?

The standard, scale-invariant, inflationary perturbation spectrum will be modified if the effects of trans-Planckian physics are incorporated into the dynamics of the matter field in a

Holography and the scale invariance of density fluctuations

We study a scenario for the very early universe in which there is a fast phase transition from a non-geometric, high temperature phase to a low temperature, geometric phase described by a classical

Spectral dimension of a quantum universe

In this paper, we calculate in a transparent way the spectral dimension of a quantum spacetime, considering a diffusion process propagating on a fluctuating manifold. To describe the erratic path of