Fetching the paper…

Reading the bibliography…

2019

Anthropic Bound on Dark Radiation and its Implications for Reheating

Takahashi, Fuminobu, Yamada, Masaki

Original
PDF
Post on X

Understand

We derive an anthropic bound on the extra neutrino species, $\Delta N_{\rm eff}$, based on the observation that a positive $\Delta N_{\rm eff}$ suppresses the growth of matter fluctuations due to the prolonged radiation dominated era, which reduces the fraction of matter that collapses into galaxies, hence, the number of observers.

We vary $\Delta N_{\rm eff}$ and the positive cosmological constant while fixing the other cosmological parameters.
We then show that the probability of finding ourselves in a universe satisfying the current bound is of order a few percents for a flat prior distribution.
If $\Delta N_{\rm eff}$ is found to be close to the current upper bound or the value suggested by the $H_0$ tension, the anthropic explanation is not very unlikely.

Anthropic Bound on Dark Radiation and its Implications for Reheating · Around

Built on

C. D. Kreisch, F.-Y. Cyr-Racine and O. Doré, The Neutrino Puzzle: Anomalies, Interactions, and Cosmological Tensions , 1902.00534
Original
1902
Earlier work this paper cites.
K. L. Pandey, T. Karwal and S. Das, Alleviating the H 0 H_{0} and σ 8 \sigma_{8} anomalies with a decaying dark matter model , 1902.10636
Original
1902
Earlier work this paper cites.
A. G. Riess, S. Casertano, W. Yuan, L. M. Macri and D. Scolnic, Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM , 1903.07603
Original
1903
Earlier work this paper cites.
G. A. Barenboim, P. B. Denton and I. M. Oldengott, Inflation meets neutrinos , 1903.02036
Original
1903
Earlier work this paper cites.
N. Kaloper, Dark Energy, H 0 H_{0} and Weak Gravity Conjecture , 1903.11676
Original
1903
Earlier work this paper cites.
J. Halverson, C. Long, B. Nelson and G. Salinas, On Axion Reheating in the String Landscape , 1903.04495
Original
1903
Earlier work this paper cites.
P. Agrawal, F.-Y. Cyr-Racine, D. Pinner and L. Randall, Rock ’n’ Roll Solutions to the Hubble Tension , 1904.01016
Original
1904
Earlier work this paper cites.
S. Alexander and E. McDonough, Axion-Dilaton Destabilization and the Hubble Tension , 1904.08912
Original
1904
Earlier work this paper cites.
P. Forrester, Comment on “sum of squares of uniform random variables” by i. weissman , arXiv:1804.07861
Original
1904
Earlier work this paper cites.
S. Weinberg, Goldstone Bosons as Fractional Cosmic Neutrinos , Phys. Rev. Lett. 110
Original
1971
Earlier work this paper cites.
P. Davies and S. Unwin, Why is the cosmological constant so small? , Proc. Roy. Soc. 377
1981
Earlier work this paper cites.
J. D. Barrow, The isotropy of the universe , Quart. Jl. Roy. astr. Soc. 23
1982
Earlier work this paper cites.
P. Candelas, G. T. Horowitz, A. Strominger and E. Witten, Vacuum Configurations for Superstrings , Nucl. Phys. B258
1985
Earlier work this paper cites.
A. Linde, Three Hundred Years of Gravitation . Cambridge University Press, 1987
1987
Earlier work this paper cites.
S. Weinberg, Anthropic Bound on the Cosmological Constant , Phys. Rev. Lett. 59
1987
Earlier work this paper cites.
J. D. Barrow and F. J. Tipler, The Anthropic Cosmological Principle . Oxford U. Pr., Oxford, 1988
1988
Earlier work this paper cites.

Similar

J. D. Barrow and P. Saich, The growth of large-scale structure with a cosmological constant , Mon. Not. Roy. astr. Soc. 262
1993
Cited alongside, same era.
C. Rousseau and O. Ruehr, Problems and solutions. subsection: The volume of the intersection of a cube and a ball in n n -space. two solutions by bernd tibken and denis constales. , SIAM Review 39
1997
Cited alongside, same era.
H. Martel, P. R. Shapiro and S. Weinberg, Likely values of the cosmological constant , Astrophys. J. 492
1998
Cited alongside, same era.
M. Kawasaki, K. Kohri and N. Sugiyama, Cosmological constraints on late time entropy production , Phys. Rev. Lett. 82
1999
Cited alongside, same era.
M. Kawasaki, K. Kohri and N. Sugiyama, MeV scale reheating temperature and thermalization of neutrino background , Phys. Rev. D62
2000
Cited alongside, same era.

Then

T. Higaki, K. Nakayama and F. Takahashi, Moduli-Induced Axion Problem , JHEP 07
Original
2013
Later among the works it cites.
W. L. K. Wu, J. Errard, C. Dvorkin, C. L. Kuo, A. T. Lee, P. McDonald et al., A Guide to Designing Future Ground-based Cosmic Microwave Background Experiments , Astrophys. J. 788
Original
2014
Later among the works it cites.
T. Higaki and F. Takahashi, Natural and Multi-Natural Inflation in Axion Landscape , JHEP 07
Original
2014
Later among the works it cites.
M. Kawasaki, M. Yamada and T. T. Yanagida, Observable dark radiation from a cosmologically safe QCD axion , Phys. Rev. D91
Original
2015
Later among the works it cites.
Z. Chacko, Y. Cui, S. Hong and T. Okui, Hidden dark matter sector, dark radiation, and the CMB , Phys. Rev. D92

Beyond the bibliography

alphaXiv searches the wider corpus for related work and actual follow-ups.

Open on alphaXiv

alphaXiv is searching for related work…

L. Pogosian, A. Vilenkin and M. Tegmark, Anthropic predictions for vacuum energy and neutrino masses , JCAP 0407

2004

Cited alongside, same era.

S. Hannestad, What is the lowest possible reheating temperature? , Phys. Rev. D70

2004

Cited alongside, same era.

M. Tegmark, A. Vilenkin and L. Pogosian, Anthropic predictions for neutrino masses , Phys. Rev. D71

2005

Cited alongside, same era.

K. Ichikawa, M. Kawasaki and F. Takahashi, The Oscillation effects on thermalization of the neutrinos in the Universe with low reheating temperature , Phys. Rev. D72

2005

Cited alongside, same era.

K. Ichikawa, M. Kawasaki, K. Nakayama, M. Senami and F. Takahashi, Increasing effective number of neutrinos by decaying particles , JCAP 0705

2007

Cited alongside, same era.

S. Weinberg, Cosmology . 2008

2008

Cited alongside, same era.

M. Cicoli and A. Mazumdar, Reheating for Closed String Inflation , JCAP 1009

2010

Cited alongside, same era.

2015

Later among the works it cites.

T. Higaki and F. Takahashi, Axion Landscape and Natural Inflation , Phys. Lett. B744

2015

Later among the works it cites.

J. Renk, M. Zumalacárregui, F. Montanari and A. Barreira, Galileon gravity in light of ISW, CMB, BAO and H 0 data , JCAP 1710

2017

Later among the works it cites.

A. Masoumi, A. Vilenkin and M. Yamada, Inflation in random Gaussian landscapes , JCAP 1705

2017

Later among the works it cites.

A. Masoumi, A. Vilenkin and M. Yamada, Inflation in multi-field random Gaussian landscapes , JCAP 1712

2017

Later among the works it cites.

S. Dhawan, S. W. Jha and B. Leibundgut, Measuring the Hubble constant with Type Ia supernovae as near-infrared standard candles , Astron. Astrophys. 609

2018

Later among the works it cites.

E. Mörtsell and S. Dhawan, Does the Hubble constant tension call for new physics? , JCAP 1809

2018

Later among the works it cites.

F. D’Eramo, R. Z. Ferreira, A. Notari and J. L. Bernal, Hot Axions and the H 0 H_{0} tension , JCAP 1811

2018

Later among the works it cites.

M. Yamada and A. Vilenkin, Hessian eigenvalue distribution in a random Gaussian landscape , JHEP 03

2018

Later among the works it cites.

K. Aylor, M. Joy, L. Knox, M. Millea, S. Raghunathan and W. L. K. Wu, Sounds Discordant: Classical Distance Ladder & Λ \Lambda CDM -based Determinations of the Cosmological Sound Horizon , Astrophys. J. 874

2019

Closest in time.

M. Cicoli and G. A. Piovano, Reheating and Dark Radiation after Fibre Inflation , JCAP 2019

Original

2019

Closest in time.