Do we really understand the cosmos

@article{Padmanabhan2016DoWR,
  title={Do we really understand the cosmos},
  author={Thanu Padmanabhan},
  journal={Comptes Rendus Physique},
  year={2016},
  volume={18},
  pages={275-291}
}
  • T. Padmanabhan
  • Published 10 November 2016
  • Physics
  • Comptes Rendus Physique
View PDF on arXiv
25 Citations
Highly Influential Citations
3
Background Citations
11
Methods Citations
1
Results Citations
1

Figures from this paper

25 Citations

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

On cosmological expansion and local physics

We find an exact convergence in the local dynamics described by two supposedly antagonistic approaches applied at the local, solar system scale: one starting from an expanding universe perspective…

100 years of the Cosmological Constant: what's next?

The Cosmological Constant $\Lambda$, in different incarnations, has been with us for 100 years. Many surveys of dark energy are underway, indicating so far that the data are consistent with a dark…

Gravity and quantum theory: Domains of conflict and contact

There are two strong clues about the quantum structure of spacetime and the gravitational dynamics, which are almost universally ignored in the conventional approaches to quantize gravity. The first…

Proposal 42

Based on preliminary results from the Causal Fermion Systems framework regarding the matter-antimatter asymmetry in the universe, I propose a novel story line for the universe that would, if correct,…

Varying fundamental constants: a full covariant approach and cosmological applications

We build a minimal extension of General Relativity in which Newton's gravitational coupling, $G$, the speed of light, $c$, and the cosmological constant, $\Lambda$, are spacetime variables. This is…

First law of thermodynamics and emergence of cosmic space in a non-flat universe

The emergence of cosmic space as cosmic time progresses is an exciting idea advanced by Padmanabhan to explain the accelerated expansion of the universe. The generalization of Padmanabhan's…

The maximum sizes of large scale structures in alternative theories of gravity

The maximum size of a cosmic structure is given by the maximum turnaround radius—the scale where the attraction due to its mass is balanced by the repulsion due to dark energy. We derive generic…

Configuration entropy of the cosmic web: can voids mimic the dark energy?

  • B. Pandey
  • Physics
    Monthly Notices of the Royal Astronomical Society: Letters
  • 2019
We propose an alternative physical mechanism to explain the observed accelerated expansion of the Universe based on the configuration entropy of the cosmic web and its evolution. We show that the…

Configuration entropy in the ΛCDM and the dynamical dark energy models: Can we distinguish one from the other?

This work considers the $\Lambda$CDM model and a set of dynamical dark energy models with different parametrization of the equation of state and explores the evolution of the configuration entropy in these models.

References

SHOWING 1-10 OF 33 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…

Emergent perspective of gravity and dark energy

There is sufficient amount of internal evidence in the nature of gravitational theories to indicate that gravity is an emergent phenomenon like, e.g, elasticity. Such an emergent nature is most…

Quantum evolution leading to classicality: a concrete example

Can certain degrees of freedom of a closed physical system, described by a time-independent Hamiltonian, become more and more classical as they evolve from 1 some state? This question is important…

General relativity from a thermodynamic perspective

I show that the gravitational dynamics in a bulk region of space can be connected to a thermodynamic description in the boundary of that region, thereby providing clear physical interpretations of…

Particle creation, classicality and related issues in quantum field theory: I. Formalism and toy models

The quantum theory of a harmonic oscillator with a time dependent frequency arises in several important physical problems, especially in the study of quantum field theory in an external background.…

Structure of the Gravitational Action and its relation with Horizon Thermodynamics and Emergent Gravity Paradigm

If gravity is an emergent phenomenon, as suggested by several recent results, then the structure of the action principle for gravity should encode this fact. With this motivation we study several…

Evolution of quantum field, particle content, and classicality in the three stage universe

We study the evolution of a quantum scalar field in a toy universe which has three stages of evolution, viz., (i) an early (inflationary) de Sitter phase (ii) radiation-dominated phase and (iii)…

Notes on black-hole evaporation

This paper examines various aspects of black-hole evaporation. A two-dimensional model is investigated where it is shown that using fermion-boson cancellation on the stress-energy tensor reduces the…

Vacuum fluctuations and the small scale structure of spacetime.

We show that vacuum fluctuations of the stress-energy tensor in two-dimensional dilaton gravity lead to a sharp focusing of light cones near the Planck scale, effectively breaking space up into a…

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…