Understanding the Accelerating Universe using the MSE. Gong-Bo Zhao NAOC
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1 Understanding the Accelerating Universe using the MSE Gong-Bo Zhao NAOC
2 Nobel Prize 2011 a > 0
3 The expansion of the Universe can accelerate if In GR, to add new repulsive matter, which contributes 70% total energy To modify General Relativity NASA/Jim Campbell/Aero-News Network Dark Energy Modified Gravity
4 The expansion of the Universe can accelerate if In GR, to add new repulsive matter, which contributes 70% total energy To modify General Relativity NASA/Jim Campbell/Aero-News Network Dark Energy Modified Gravity LSS can help to break the degeneracy
5 CMB Redshift surveys (BAO,RSD)
6 NASA
7 100+ Nobel Prizes since 1901! NASA
8 100+ Nobel Prizes since 1901! NASA Huge discovery space in the dark sector!
9 100+ Nobel Prizes since 1901! NASA Huge discovery space in the dark sector! CMB (1978; 2006) Cosmic Acceleration (2011)
10 9, 376 deg 2 1, 372, 737 galaxies 294, 153 quasars ( ) DESI, PFS MSE (2025?) credit: Jean-Paul KNEIB
11 MSE DESI i=24 mag FoV: 1.5 deg 2 10,000 deg 2 ~2100 spectra / deg 2 credit: Alan
12 5x10 6 4x10 6 dn/dz 3x10 6 2x10 6 1x redshift z Credit: Johan Comparat
13 MSE!! DE: BAO/RSD MG: Galaxy dynamics
14 DE as a solution to the accelerating universe problem
15 Dark Energy Negative pressure: a / a = 4πG (ρ + 3p) > 0 3 w p / ρ < 1/ 3 Candidates:Vacuum energy : w = -1 Dynamical fields: Quintessence w (a)>-1 Phantom w (a)<-1 Quintom w (a) across -1
16 10 DESI Euclid MSE σ(lnr) (%) redshift z credit: Yuting Wang
17 10 DESI Euclid MSE σ(lnfσ 8 ) (%) redshift z credit: Yuting Wang
18 Reconstruct w(a) parametrically w(a)=w 0 +w a (1-a) Planck (Ade et al), 2015
19 DESI Euclid MSE w a w 0
20 Modified Gravity as a solution to the accelerating universe problem
21 Modified Gravity Resemble GR+Λ Cosmological scales R>Gpc Small scales Large scales
22 Modified Gravity Observationally testable feature Structure formation scales Mpc<R<Gpc Resemble GR+Λ Cosmological scales R>Gpc Small scales Large scales
23 Recover GR Galactic scales R<Mpc Modified Gravity Observationally testable feature Structure formation scales Mpc<R<Gpc Resemble GR+Λ Cosmological scales R>Gpc Small scales Large scales
24 Recover GR Galactic scales R<Mpc Modified Gravity Observationally testable feature Structure formation scales Mpc<R<Gpc Resemble GR+Λ Cosmological scales R>Gpc Small scales Large scales f(r) gravity
25 Modified Gravity Recover GR Galaxy scales R<Mpc Observationally testable feature Structure formation scales Mpc<R<Gpc Small scales Resemble GR+Λ Cosmological scales R>Gpc Large scales SNe, CMB RSD
26 Numerical Simulations GBZ, B.Li, K.Koyama, 2011
27 GR
28 f(r)
29 GR TEST: Compare the lensing mass to the dynamical mass
30 Structure formation in GR July 30, 2015
31 Structure formation in f(r) July 30, 2015
32 Dynamical Mass Spherical symmetry MSE Science mee7ng, Big Island, Hawaii July 30, 2015
33 Lensing Mass Spherical symmetry MSE Science mee7ng, Big Island, Hawaii July 30, 2015
34 Mass Difference In GR, Δ M = 0 In MG, Δ M [0,1/ 3] July 30, 2015
35 GBZ, Baojiu Li, Kazuya Koyama (2011) July 30, 2015
36 Clean mass dependence! July 30, 2015
37 July 30, 2015
38 Large scatter shows the environmental effect!! July 30, 2015
39 July 30, 2015
40 Apparent environmental dependence!! July 30, 2015
41 July 30, 2015
42 No screening! July 30, 2015
43 July 30, 2015
44 Maximum screening Core is better screened July 30, 2015
45 July 30, 2015
46 Screened purely by environment July 30, 2015
47 July 30, 2015
48 Screening on the edge shows environmental dependence! July 30, 2015
49 Observationally Lensing Mass: TMT Dynamical Mass: MSE July 30, 2015
50 Measure lensing and dynamical mass profile for each cluster; Divide the sample using D; Compare! MSE Science mee7ng, Big Island, Hawaii July 30, 2015
51 Summary MSE can provide comparable DE constraints with Euclid/DESI, and complementary; A synergy between MSE and TMT can offer a high precision test of gravity on galactic scales!
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