# Cosmic coincidence or graviton mass

@article{Das2014CosmicCO,
title={Cosmic coincidence or graviton mass},
author={Saurya Das},
journal={International Journal of Modern Physics D},
year={2014},
volume={23},
pages={1442017}
}
• Saurya Das
• Published 15 May 2014
• Physics
• International Journal of Modern Physics D
Using the quantum corrected Friedmann equation, obtained from the quantum Raychaudhuri equation, and assuming a small mass of the graviton (but consistent with observations and theory), we propose a resolution of the smallness problem (why is observed vacuum energy so small?) and the coincidence problem (why does it constitute most of the universe, about 70%, in the current epoch?).
5 Citations
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We address the validity of the formalism and results presented in [ S. Das, Phys. Rev. {\bf D89} 084068 (2014)] with regard to quantum Raychaudhuri equation. The author obtained the so called quantum

## References

SHOWING 1-10 OF 26 REFERENCES
Graviton mass bounds from space-based gravitational-wave observations of massive black hole populations
• Physics
• 2011
Max-Planck Institut fu¨r Gravitationasphysik (Albert-Einstein-Institut),Am Mu¨hlenberg 1, D-14476, Potsdam, Germany(Dated: July 19, 2011)Space-based gravitational-wave (GW) detectors, such as LISA or
Quantum Raychaudhuri equation
We compute quantum corrections to the Raychaudhuri equation, by replacing classical geodesics with quantal (Bohmian) trajectories, and show that they prevent focusing of geodesics, and the formation
DOES ENTROPIC GRAVITY BOUND THE MASSES OF THE PHOTON AND GRAVITON?
• Physics
• 2011
If the information transfer between test particle and holographic screen in entropic gravity respects both the uncertainty principle and causality, a lower limit on the number of bits in the universe
Cosmic acceleration and the helicity-0 graviton
• Physics
• 2011
We explore cosmology in the decoupling limit of a nonlinear covariant extension of Fierz-Pauli massive gravity obtained recently in arXiv:1007.0443. In this limit the theory is a scalar-tensor model
Photon and graviton mass limits
• Physics
• 2010
Efforts to place limits on deviations from canonical formulations of electromagnetism and gravity have probed length scales increasing dramatically over time. Historically, these studies have passed
Bounding the mass of the graviton using binary pulsar observations
• Physics, Geology
• 2002
The close agreement between the predictions of dynamical general relativity for the radiated power of a compact binary system and the observed orbital decay of the binary pulsars PSR B1913+16 and PSR
Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Physics
• 1998
We present spectral and photometric observations of 10 Type Ia supernovae (SNe Ia) in the redshift range 0.16 " z " 0.62. The luminosity distances of these objects are determined by methods that
Relativistic Quantum Mechanics
List of Exercises.- Preface.- 1. Relativistic Description of Spin-0 Particles.- 2. Relativistic Description of Spin-1/2 Particles.- 3. Relativistic Scattering Theory, Appendix.
The Gross-Pitaevskii Equation and Bose-Einstein condensates
The Gross–Pitaevskii equation (GPE) is discussed at the level of an advanced course on statistical physics. In the standard literature the GPE is usually obtained in the framework of the second
Quantumness beyond quantum mechanics
Bohmian mechanics allows us to understand quantum systems in the light of other quantum traits than the well-known ones (coherence, diraction, interference, tunnelling, discreteness, entanglement,