SCALARTENSOR THEORIES OF GRAVITY AND ITS APPLICATION NTU

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SCALAR-TENSOR THEORIES OF GRAVITY AND ITS APPLICATION NTU Physics/CTS Theory Seminar May. 13 th.

SCALAR-TENSOR THEORIES OF GRAVITY AND ITS APPLICATION NTU Physics/CTS Theory Seminar May. 13 th. 2009 Seokcheon (sky) Lee (李碩天) Institute of Physics, Academia Sinica & Le. Cos. PA, National Taiwan University

OUTLINE 2 Observational Evidences of the Accelerating Universe Dark Energy vs. Modified Gravity Scalar-Tensor

OUTLINE 2 Observational Evidences of the Accelerating Universe Dark Energy vs. Modified Gravity Scalar-Tensor Theories Background Evolutions and Perturbations (Observables) Summary MAY. 13 TH. 2009 SKY LEE // NTU & CTS

ACCELERATING UNIVERSE 3 Accelerating Universe CMB LSS Clusters Wtotal= 1. 0 Locations of Peaks

ACCELERATING UNIVERSE 3 Accelerating Universe CMB LSS Clusters Wtotal= 1. 0 Locations of Peaks WM= 0. 3 Power spectra t 0 = 13. 7 Gyr SNe 1 a q 0 < 0 Brightness MAY. 13 TH. 2009 H-value SKY LEE // NTU & CTS

4 B ACKGROUND E VOLUTION Luminosity Distance MAY. 13 TH. 2009 SKY LEE //

4 B ACKGROUND E VOLUTION Luminosity Distance MAY. 13 TH. 2009 SKY LEE // NTU & CTS

5 DARK ENERGY VS. MODIFIED GRAVITY Bad Management (original background) or Someone was here

5 DARK ENERGY VS. MODIFIED GRAVITY Bad Management (original background) or Someone was here (source of disturbance)? MAY. 13 TH. 2009 SKY LEE // NTU & CTS

DARK ENERGY VS. MODIFIED GRAVITY 6 Still require Dark Matter in both theories except

DARK ENERGY VS. MODIFIED GRAVITY 6 Still require Dark Matter in both theories except Te. Ve. S MAY. 13 TH. 2009 SKY LEE // NTU & CTS

DARK ENERGY MODELS I 7 Cosmological constant Quintessence MAY. 13 TH. 2009 SKY LEE

DARK ENERGY MODELS I 7 Cosmological constant Quintessence MAY. 13 TH. 2009 SKY LEE // NTU & CTS

DE II : QUARTESSENCE 8 (UNIFICATION OF DM & DE) MAY. 13 TH. 2009

DE II : QUARTESSENCE 8 (UNIFICATION OF DM & DE) MAY. 13 TH. 2009 SKY LEE // NTU & CTS

MODIFIED GRAVITY I 10 A broad class of alternative gravity theories Y : matter

MODIFIED GRAVITY I 10 A broad class of alternative gravity theories Y : matter fields f : a scalar field MAY. 13 TH. 2009 SKY LEE // NTU & CTS

11 MODIFIED GRAVITY II MAY. 13 TH. 2009 SKY LEE // NTU & CTS

11 MODIFIED GRAVITY II MAY. 13 TH. 2009 SKY LEE // NTU & CTS

SCALAR-TENSOR GRAVITY I 13 MAY. 13 TH. 2009 SKY LEE // NTU & CTS

SCALAR-TENSOR GRAVITY I 13 MAY. 13 TH. 2009 SKY LEE // NTU & CTS

STG II 14 MAY. 13 TH. 2009 SKY LEE // NTU & CTS

STG II 14 MAY. 13 TH. 2009 SKY LEE // NTU & CTS

STG III 15 MAY. 13 TH. 2009 SKY LEE // NTU & CTS

STG III 15 MAY. 13 TH. 2009 SKY LEE // NTU & CTS

STG IV 16 MAY. 13 TH. 2009 SKY LEE // NTU & CTS

STG IV 16 MAY. 13 TH. 2009 SKY LEE // NTU & CTS

PERTURBATION QUANTITIES 21 MAY. 13 TH. 2009 SKY LEE // NTU & CTS

PERTURBATION QUANTITIES 21 MAY. 13 TH. 2009 SKY LEE // NTU & CTS

PERTURBATION QUANTITIES (CONTINUED) 22 MAY. 13 TH. 2009 SKY LEE // NTU & CTS

PERTURBATION QUANTITIES (CONTINUED) 22 MAY. 13 TH. 2009 SKY LEE // NTU & CTS

OBSERVABLES 23 MAY. 13 TH. 2009 SKY LEE // NTU & CTS

OBSERVABLES 23 MAY. 13 TH. 2009 SKY LEE // NTU & CTS

SUMMARY 24 STG is one of well motivated and known alternative theories of gravity.

SUMMARY 24 STG is one of well motivated and known alternative theories of gravity. Accurate measurements for the background evolutions to constraint the parameters of theories. Compare with perturbation observables. Probably we can distinguish the origin of acceleration from both background and perturbation evolutions. MAY. 13 TH. 2009 SKY LEE // NTU & CTS