The Cosmic Expansion History
from Line-Intensity Mapping
José Luis Bernal
Johns Hopkins University
arXiv:1907.10065
JLB, P. Breysse, E. D. Kovetz“Cosmic Expansion History with Line-Intensity Mapping”
arXiv:1907.10067
JLB, P. Breysse, H. Gil-Marin, E. D. Kovetz“A User’s Guide to Extracting Cosmological Information from Line-Intensity Map”
Cosmic Controversies
10/05/2019

What happens at 2 ≲ # ≲ 1000?

E. D. Kovetz

What happens at 2 ≲ # ≲ 1000?

E. D. Kovetz

Probed Universe

What happens at 2 ≲ # ≲ 1000?
Indirect measurements with CMB lensing(but peaked at # ∼ 2, anddon’t forget '()*+ controversy)

E. D. Kovetz

Probed Universe

What happens at 2 ≲ # ≲ 1000?
• Different stages of evolution
across time
• But we have only exploited asmall part
• LIM: integrated signal from all
sourcesE. D. Kovetz

Optimistic experimental status

What happens at 2 ≲ # ≲ 1000?
• Different stages of evolution
across time
• But we have only exploited asmall part
• LIM: integrated signal from all
sources

Biased tracer of the density fluctuations
E. D. Kovetz

Cosmological information

Optimistic experimental status

But degenerate with astrophysics

Using LIM for cosmology• Focus on the anisotropic power spectrum:! ", $, % = ' %( ) ( % * ( (", $, %)! ", %0+,' %

9:∝ ∫89898+ !2345 (%)
9:!2345 ∝ ∫ 898
98(Using LIM for cosmology• Focus on the anisotropic power spectrum:• Alcock-Paczynski effect: !∥#$%& = !∥()*$ +∥ ;!-#$%& = !-()*$ +-. / 0& 123+∥ =. / 0&

BAO feature helps to measure the AP effect+- =45 (/)/0&
45 / /0& 123

Using LIM for cosmology• Focus on the anisotropic power spectrum:• Alcock-Paczynski effect: !∥#$%& = !∥()*$ +∥ ;• Breaking degeneracies: . !, 0, 1 =!-#$%& = !-()*$ +-2 345 + 2 74508
1 + 0.5 !04=>? 8

8.# (!)+ .&B>( (1)845Cosmo params

D⃗ = {+∥ , +-, 2 745, 2 345, 4=>? , .&B>( }Using a template for .# (!, 1)

Using LIM for cosmology• Focus on the anisotropic power spectrum:• Alcock-Paczynski effect: #∥,-./ = #∥012- 3∥ ;• Breaking degeneracies: " #, %, & =#5,-./ = #5012- 35

6 789 + 6 ;89%<
1 + 0.5 #%8ABC <<", (#)+ "/DB0 (&)<89• Include experimental window function: "! #, %, & = ( #, %, & "(#, %, &)Using LIM for cosmology• Focus on the anisotropic power spectrum:• Alcock-Paczynski effect: #∥,-./ = #∥012- 3∥ ;#5,-./ = #5012- 35

6 789 + 6 ;89%<
1 + 0.5 #%8ABC <• Breaking degeneracies: " #, %, & =<", (#)+ "/DB0 (&)<89• Include experimental window function: "! #, %, & = ( #, %, & "(#, %, &)• Legendre multipoles: up to the hexadecapole! 3∥ , 35, 6 ;89
F &,-./!
"ℓ #, & = GHI
F&GHI
JK &JK &<2ℓ + 1 O ,-./
M P%"! #012- , %012- , & ℒℓ (%,-./ )2NO

LIM BAO
Angular diameter distance

Hubble parameter

Current and coming constraints using galaxy surveys

Constraining the expansion history

Model
independent !(&)
reconstructed withcubic splines

Current constraints using galaxy surveys(and !" and #$ )Constraining the expansion history

Modelindependent !(&)
reconstructed withcubic splines
ProbedUniverse

Current constraints using galaxy surveys(and !" and #$ )

LIM BAO
Angular diameter distance

Hubble parameter

Current and coming constraints using galaxy surveys+ Star-Formation-related LIM BAO

LIM BAO
Angular diameter distance

Hubble parameter

Current and coming constraints using galaxy surveys+ Star-Formation-related LIM BAO

LIM BAO
Angular diameter distance

Hubble parameter

Current and coming constraints using galaxy surveys+ Star-Formation-related LIM BAO

Constraining the expansion history

Bridge early and late
Universe to probe
post-recombination
solutions

Modelindependent !(&)
reconstructed withcubic splines
To beProbed
Universe probed by LIM

Current constraints using galaxy surveys(and !" and #$ ) and ADDING LIM BAO

Conclusions• Optimal exploitation of the anisotropic LIM power spectrum for cosmology:• Identify degeneracies and isolate the cosmological information• Multipole expansion up to the hexadecapole• Experimental window• Flexible for models beyond ΛCDM
• LIM will grant access to unprobed stages of the Universe• LIM will bridge between late and early Universe and probe "($ < 7) to ∼ 10% in
the coming years (∼ 2% with IMS3) in a model independent way• Best way to probe post-recombination solutions to the "- tension

For more information

ProbedUniverseTo beprobed by LIM

arXiv:1907.10065
JLB, P. Breysse, E. D. Kovetz“Cosmic Expansion History with Line-Intensity Mapping”
arXiv:1907.10067
JLB, P. Breysse, H. Gil-Marin, E. D. Kovetz“A User’s Guide to Extracting Cosmological Information from Line-Intensity Map”

Back up slides

LIM experimental landscape

6.2 arcsec
R=41.4