Built on

E. W. Kolb, D. Seckel and M. S. Turner, The Shadow World , Nature 314
1985
Earlier work this paper cites.
H. M. Hodges, Mirror baryons as the dark matter , Phys. Rev. D47
1993
Earlier work this paper cites.
G. Jungman, M. Kamionkowski, A. Kosowsky and D. N. Spergel, Cosmological parameter determination with microwave background maps , Phys. Rev. D54
1996
Earlier work this paper cites.
W. Hu and N. Sugiyama, Small scale cosmological perturbations: An Analytic approach , Astrophys. J. 471
1996
Earlier work this paper cites.
R. E. Lopez, S. Dodelson, A. Heckler and M. S. Turner, Precision detection of the cosmic neutrino background , Phys. Rev. Lett. 82
1999
Earlier work this paper cites.
A. D. Dolgov, Neutrinos in cosmology , Phys. Rept. 370
2002
Earlier work this paper cites.
Z. Chacko, L. J. Hall, T. Okui and S. J. Oliver, CMB signals of neutrino mass generation , Phys. Rev. D70
2004
Earlier work this paper cites.
S. Bashinsky and U. Seljak, Neutrino perturbations in CMB anisotropy and matter clustering , Phys. Rev. D69
2004
Earlier work this paper cites.
S. Weinberg, Damping of tensor modes in cosmology , Phys. Rev. D69
2004
Earlier work this paper cites.
Z. Chacko, H.-S. Goh and R. Harnik, The Twin Higgs: Natural electroweak breaking from mirror symmetry , Phys. Rev. Lett. 96
2006
Earlier work this paper cites.
J. L. Feng, H. Tu and H.-B. Yu, Thermal Relics in Hidden Sectors , JCAP 0810
Original
2008
Earlier work this paper cites.
L. Ackerman, M. R. Buckley, S. M. Carroll and M. Kamionkowski, Dark Matter and Dark Radiation , Phys. Rev. D79
Original
2009
Earlier work this paper cites.
D. E. Kaplan, G. Z. Krnjaic, K. R. Rehermann and C. M. Wells, Atomic Dark Matter , JCAP 1005
Original
2010
Earlier work this paper cites.
K. Nakayama, F. Takahashi and T. T. Yanagida, A theory of extra radiation in the Universe , Phys. Lett. B697
Original
2011
Earlier work this paper cites.
W. Fischler and J. Meyers, Dark Radiation Emerging After Big Bang Nucleosynthesis? , Phys. Rev. D83
Original
2011
Earlier work this paper cites.
D. Blas, J. Lesgourgues and T. Tram, The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes , JCAP 1107
Original
2011
Earlier work this paper cites.

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2017

Cosmological Constraints on Interacting Light Particles

Brust, Christopher, Cui, Yanou, Sigurdson, Kris

Understand

Cosmological observations are becoming increasingly sensitive to the effects of light particles in the form of dark radiation (DR) at the time of recombination.

The conventional observable of effective neutrino number, $N_{\rm eff}$, is insufficient for probing generic, interacting models of DR.
In this work, we perform likelihood analyses which allow both free-streaming effective neutrinos (parametrized by $N_{\rm eff}$) and interacting effective neutrinos (parametrized by $N_{\rm fld}$).
We motivate an alternative parametrization of DR in terms of $N_{\rm tot}$ (total effective number of neutrinos) and $f_{\rm fs}$ (the fraction of effective neutrinos which are free-streaming), which is less degenerate than using $N_{\rm eff}$ and $N_{\rm fld}$.

Built on

E. W. Kolb, D. Seckel and M. S. Turner, The Shadow World , Nature 314
1985
Earlier work this paper cites.
H. M. Hodges, Mirror baryons as the dark matter , Phys. Rev. D47
1993
Earlier work this paper cites.
G. Jungman, M. Kamionkowski, A. Kosowsky and D. N. Spergel, Cosmological parameter determination with microwave background maps , Phys. Rev. D54
1996
Earlier work this paper cites.
W. Hu and N. Sugiyama, Small scale cosmological perturbations: An Analytic approach , Astrophys. J. 471
1996
Earlier work this paper cites.
R. E. Lopez, S. Dodelson, A. Heckler and M. S. Turner, Precision detection of the cosmic neutrino background , Phys. Rev. Lett. 82
1999
Earlier work this paper cites.
A. D. Dolgov, Neutrinos in cosmology , Phys. Rept. 370
2002
Earlier work this paper cites.
Z. Chacko, L. J. Hall, T. Okui and S. J. Oliver, CMB signals of neutrino mass generation , Phys. Rev. D70
2004
Earlier work this paper cites.
S. Bashinsky and U. Seljak, Neutrino perturbations in CMB anisotropy and matter clustering , Phys. Rev. D69
2004
Earlier work this paper cites.
S. Weinberg, Damping of tensor modes in cosmology , Phys. Rev. D69
2004
Earlier work this paper cites.
Z. Chacko, H.-S. Goh and R. Harnik, The Twin Higgs: Natural electroweak breaking from mirror symmetry , Phys. Rev. Lett. 96
2006
Earlier work this paper cites.
J. L. Feng, H. Tu and H.-B. Yu, Thermal Relics in Hidden Sectors , JCAP 0810
Original
2008
Earlier work this paper cites.
L. Ackerman, M. R. Buckley, S. M. Carroll and M. Kamionkowski, Dark Matter and Dark Radiation , Phys. Rev. D79
Original
2009
Earlier work this paper cites.
D. E. Kaplan, G. Z. Krnjaic, K. R. Rehermann and C. M. Wells, Atomic Dark Matter , JCAP 1005
Original
2010
Earlier work this paper cites.
K. Nakayama, F. Takahashi and T. T. Yanagida, A theory of extra radiation in the Universe , Phys. Lett. B697
Original
2011
Earlier work this paper cites.
W. Fischler and J. Meyers, Dark Radiation Emerging After Big Bang Nucleosynthesis? , Phys. Rev. D83
Original
2011
Earlier work this paper cites.
D. Blas, J. Lesgourgues and T. Tram, The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes , JCAP 1107
Original
2011
Earlier work this paper cites.