Download presentation

Presentation is loading. Please wait.

Published byCharity Peffer Modified over 3 years ago

1
L. Perivolaropoulos http://leandros.physics.uoi.gr Department of Physics University of Ioannina Open page S. Nesseris, LP, astro-ph/0610092, astro-ph/0611238

2
Observational Probes of the Accelerating Expansion w(z) is close to -1 w(z) crossing the w=-1 w(z) crossing the w=-1 Inconsistent with Minimally Coupled Quintessence and also with Scalar Tensor Quintessence if G(t) is increasing with time. Marginal Consistency of Scalar-Tensor Quintessence with Observed Accelerating Expansion Maximal Agreement of Scalar-Tensor Quintessence with the Full Parameter Range of Observed Acelerating Expansion G(t) can not increase rapidly with t (not sharp Maximum) Close to Extremum (Solar System) G(t) decreases with t (close to a Minimum) Close to Extremum (Solar System) SNLS

5
All best fit parameterizations cross the phantom divide at z~0.25 The parametrization with the best χ 2 is oscillating Lazkoz, Nesseris, LP 2005

7
Trunc. Gold (140 points, z<1) Full Gold (157 points, z<1.7)SNLS (115 points z<1) SNLS data show no trend for crossing the phantom divide w=-1! S. Nesseris, L.P. Phys. Rev. D72:123519, 2005 astro-ph/0511040

8
Gold dataset Riess -et. al. (2004) SNLS dataset Astier -et. al. (2005) Other data: CMB, BAO, LSS, Clusters S. Nesseris, L.P. astro-ph/0610092 Other data: CMB, BAO, LSS, Clusters Gold dataset Riess -et. al. (2004) SNLS dataset Astier -et. al. (2005) Other data: CMB, BAO, LSS, Clusters Minimize: Eisenstein et. al. 2005 Wang, Mukherjee 2006 Allen et. al. 2004 2dF:Verde et. al. MNRAS 2002

10
Riess et. al. astro-ph/0611572

11
Old Gold Filtered Gold+New HST Filtered Gold+New HST+Best of SNLS S. Nesseris, LP in prep.

12
Old Gold Filtered Gold+New HST Filtered Gold+New HST+Best of SNLS

13
Q1: What theories are consistent with range of observed H(z)? Cosmological Constant Quintessence Extended (Scalar–Tensor) Quintessence Braneworld models (eg DGP) Barotropic fluids (eg Chaplygin Gas) Q2: What forms of H(z) are inconsistent with each theory? (forbidden sectors) Q3: What is the overlap of the observationally allowed range of H(z) with the forbidden sector of each theory? Goal: Address Q2-Q3 for Extended Quintessence

14
Plausibility Arguments + Numerical Simulations Caldwel, Linder 2005 V(Φ) Φ Φ Thawing Thaw Accelerate Freezing Decelerate Freeze

16
Consistency Requirements:

17
Express F i in terms of G(t) current time derivatives: Ignored : (Solar System Tests, Pitjeva 2005) Gannouji, Polarski, Ranquet, Starobinsky astro-ph/0606287

18
Freezing Thawing

19
Freezing Thawing

20
Lower bound on g 2 : Chevallier-Polarski-Linder

21
Lower bound on g 2 : Upcoming Solar System Constraints on g 2 : J. Mueller 2006 Chevallier-Polarski-Linder

23
SnIa Absolute Luminosity: Steps of Analysis: 1. Assume G(z) parametrization consistent with Solar System + Nucleosynthesis bounds 2. Consider modified magnitude-redshift relation 3. Minimize χ 2

24
The shift of the contours is not significant compared to the area of the contours.

25
Observational Probes of the Accelerating Expansion w(z) is close to -1 w(z) crossing the w=-1 w(z) crossing the w=-1 Inconsistent with Minimally Coupled Quintessence and also with Scalar Tensor Quintessence if G(t) is increasing with time. Consistency of Scalar-Tensor Quintessence Observed Accelerating Expansion Maximal Agreement of Scalar-Tensor Quintessence with the full range of observed Acelerating Expansion G(t) can not increase rapidly with t (not sharp Maximum) Close to Extremum (Solar System) G(t) decreases with t (close to a Minimum) Close to Extremum (Solar System)

Similar presentations

Presentation is loading. Please wait....

OK

Observational constraints and cosmological parameters

Observational constraints and cosmological parameters

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on gps based vehicle root tracking system Ppt on polynomials and coordinate geometry graph Ppt on generation of electricity from waste Ppt on logo quiz Ppt on kinds of dependent clauses Ppt online compressor mechanic school Ppt on spiritual tourism in india Ppt on teamviewer download Ppt on event driven programming advantages Ppt on p block elements chemistry class 11