Built on

J. Silk, “Fluctuations in the Primordial Fireball,” Nature
1967
Earlier work this paper cites.
S. Weinberg, “Entropy generation and the survival of protogalaxies in an expanding universe,” Astrophys. J
1971
Earlier work this paper cites.
N. Kaiser, “Small-angle anisotropy of the microwave background radiation in the adiabatic theory,” Mon. Not. Roy. Astron. Soc
1983
Earlier work this paper cites.
B. Holdom, “Two U(1)’s and Epsilon Charge Shifts,” Phys. Lett
1986
Earlier work this paper cites.
S. Seager, D. D. Sasselov, and D. Scott, “A new calculation of the recombination epoch,” Astrophys. J
1999
Earlier work this paper cites.
A. Lewis, A. Challinor, and A. Lasenby, “Efficient Computation of CMB Anisotropies in Closed FRW Models,” Astrophys. J
2000
Earlier work this paper cites.
A. Lewis and S. Bridle, “Cosmological Parameters From CMB and Other Data: A Monte-Carlo Approach,” Phys. Rev. D
2002
Earlier work this paper cites.

Similar

S. L. Dubovsky, D. S. Gorbunov, and G. I. Rubtsov, “Narrowing the window for millicharged particles by CMB anisotropy,” JETP Lett
2004
Cited alongside, same era.
D. Blas, J. Lesgourgues, and T. Tram, “The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation Schemes,” JCAP
Original
2011
Cited alongside, same era.
Y. Ali-Haimoud and C. M. Hirata, “HyRec: A fast and highly accurate primordial hydrogen and helium recombination code,” Phys. Rev
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2011
Cited alongside, same era.
J. Chluba and R. M. Thomas, “Towards a complete treatment of the cosmological recombination problem,” Mon. Not. Roy. Astron. Soc
Original
2011
Cited alongside, same era.
A. D. Dolgov, S. L. Dubovsky, G. I. Rubtsov, and I. I. Tkachev, “Constraints on millicharged particles from Planck data,” Phys. Rev

Then

M. Raveri, W. Hu, T. Hoffman, and L.-T. Wang, “Partially Acoustic Dark Matter Cosmology and Cosmological Constraints,” Phys. Rev
Original
2017
Later among the works it cites.
D. Green and S. Rajendran, “The Cosmology of Sub-MeV Dark Matter,” JHEP
Original
2017
Later among the works it cites.
S. Knapen, T. Lin, and K. M. Zurek, “Light Dark Matter: Models and Constraints,” Phys. Rev
Original
2017
Later among the works it cites.
M. A. Buen-Abad, M. Schmaltz, J. Lesgourgues, and T. Brinckmann, “Interacting Dark Sector and Precision Cosmology,” JCAP
Original
2018
Closest in time.
J. D. Bowman, A. E. E. Rogers, R. A. Monsalve, T. J. Mozdzen, and N. Mahesh, “An absorption profile centred at 78 megahertz in the sky-averaged spectrum,” Nature

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2018

Dark Matter Interactions, Helium, and the CMB

de Putter, Roland, Doré, Olivier, Gleyzes, Jérôme et al.

Understand

The cosmic microwave background (CMB) places a variety of model-independent constraints on the strength interactions of the dominant component of dark matter with the Standard Model.

Percent-level subcomponents of the dark matter can evade the most stringent CMB bounds by mimicking the behavior of baryons, allowing for larger couplings and novel experimental signatures.
However, in this note, we will show that such tightly coupled subcomponents leave a measurable imprint on the CMB that is well approximated by a change to the helium fraction, $Y_{\rm He}$.
Using the existing constraint on $Y_{\rm He}$, we derive a new upper limit on the fraction of tightly coupled dark matter, $f_{\rm TCDM}$, of $f_{\rm TCDM}<0.006$ (95\% C.I.).

Built on

J. Silk, “Fluctuations in the Primordial Fireball,” Nature
1967
Earlier work this paper cites.
S. Weinberg, “Entropy generation and the survival of protogalaxies in an expanding universe,” Astrophys. J
1971
Earlier work this paper cites.
N. Kaiser, “Small-angle anisotropy of the microwave background radiation in the adiabatic theory,” Mon. Not. Roy. Astron. Soc
1983
Earlier work this paper cites.
B. Holdom, “Two U(1)’s and Epsilon Charge Shifts,” Phys. Lett
1986
Earlier work this paper cites.
S. Seager, D. D. Sasselov, and D. Scott, “A new calculation of the recombination epoch,” Astrophys. J
1999
Earlier work this paper cites.
A. Lewis, A. Challinor, and A. Lasenby, “Efficient Computation of CMB Anisotropies in Closed FRW Models,” Astrophys. J
2000
Earlier work this paper cites.
A. Lewis and S. Bridle, “Cosmological Parameters From CMB and Other Data: A Monte-Carlo Approach,” Phys. Rev. D
2002
Earlier work this paper cites.