A LARGER ESTIMATE OF THE ENTROPY OF THE UNIVERSE

@article{Egan2009ALE,
  title={A LARGER ESTIMATE OF THE ENTROPY OF THE UNIVERSE},
  author={Chas A. Egan and C. Lineweaver},
  journal={The Astrophysical Journal},
  year={2009},
  volume={710},
  pages={1825 - 1834}
}
Using recent measurements of the supermassive black hole (SMBH) mass function, we find that SMBHs are the largest contributor to the entropy of the observable universe, contributing at least an order of magnitude more entropy than previously estimated. The total entropy of the observable universe is correspondingly higher, and is Sobs = 3.1+3.0−1.7 × 10104 k. We calculate the entropy of the current cosmic event horizon to be SCEH = 2.6 ± 0.3 × 10122 k, dwarfing the entropy of its interior, SCEH… 

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References

SHOWING 1-10 OF 51 REFERENCES

What is the entropy of the universe?

Standard calculations suggest that the entropy of our universe is dominated by black holes, whose entropy is of order their area in Planck units, although they comprise only a tiny fraction of its

Predicting the cosmological constant from the causal entropic principle

We compute the expected value of the cosmological constant in our universe from the causal entropic principle. Since observers must obey the laws of thermodynamics and causality, the principle

Identification of all dark matter as black holes

For the universe I use dimensionless entropy S/k = ln Ω for which the most convenient unit is the googol (10100) and take all dark matter as black holes whereupon the present entropy is about a

Black hole versus cosmological horizon entropy

The generalized second law of thermodynamics states that entropy always increases when all event horizons are attributed with an entropy proportional to their area. We test the generalized second law

Inflationary universe: A possible solution to the horizon and flatness problems

The standard model of hot big-bang cosmology requires initial conditions which are problematic in two ways: (1) The early universe is assumed to be highly homogeneous, in spite of the fact that

Black Holes and Thermodynamics

A black hole of given mass, angular momentum, and charge can have a large number of different unobservable internal configurations which reflect the possible different initial configurations of the

Cosmological Neutrino Background Revisited

We solve the Boltzmann equation for cosmological neutrinos around the epoch of the electron-positron annihilation in order to verify the freeze-out approximation and to compute accurately the

Cosmological Event Horizons, Thermodynamics, and Particle Creation

It is shown that the close connection between event horizons and thermodynamics which has been found in the case of black holes can be extended to cosmological models with a repulsive cosmological

The Millennium Galaxy Catalogue: the local supermassive black hole mass function in early- and late-type galaxies

We provide a new estimate of the local supermassive black hole mass function using (i) the empirical relation between supermassive black hole mass and the Sersic index of the host spheroidal stellar

Theoretical Black Hole Mass Distributions

We derive the theoretical distribution function of black hole masses by studying the formation processes of black holes. We use the results of recent two-dimensional simulations of stellar core
...