Anthropic likelihood for the cosmological constant and the primordial density perturbation amplitude

Download

index.pdf

Date

2012-04-09

Author

Hong, Sungwook E.
Stewart, Ewan D.
Zoe, Heeseung

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

184
views

65
downloads

Weinberg et al. calculated the anthropic likelihood of the cosmological constant Lambda using a model assuming that the number of observers is proportional to the total mass of gravitationally collapsed objects, with mass greater than a certain threshold, at t -> infinity. We argue that Weinberg's model is biased toward small Lambda, and to try to avoid this bias we modify his model in a way that the number of observers is proportional to the number of collapsed objects, with mass and time equal to certain preferred mass and time scales. The Press-Schechter formalism, which we use to count the collapsed objects, identifies our collapsed object at the present time as the Local Group, making it inconsistent to choose the preferred mass scale as that of the Milky Way at the present time. Instead, we choose an earlier time before the formation of the Local Group and this makes it consistent to choose the mass scale as that of the Milky Way. Compared to Weinberg's model (T+(Lambda(0)) similar to 23%), this model gives a lower anthropic likelihood of Lambda(0) (T+(Lambda(0)) similar to 5%). On the other hand, the anthropic likelihood of the primordial density perturbation amplitude Q(0) from this model is high (T+(Q(0)) similar to 63%), while the likelihood from Weinberg's model is low (T+(Q(0)) << 0.1%). Furthermore, observers will be affected by the history of the collapsed object, and we introduce a method to calculate the anthropic likelihoods of Lambda and Q from the mass history using the extended Press-Schechter formalism. The anthropic likelihoods for Lambda and Q from this method are similar to those from our single mass constraint model, but, unlike models using the single mass constraint which always have degeneracies between Lambda and Q the results from models using the mass history are robust even if we allow both Lambda and Q to vary. In the case of Weinberg's flat prior distribution of Lambda (pocket-based multiverse measure), our mass history model gives T+(Lambda(0)) similar to 10%, while the scale factor cutoff measure and the causal patch measure give T+(Lambda(0)) greater than or similar to 30%.

Subject Keywords

Milky-way, Principle, Galaxy formation

URI

https://hdl.handle.net/11511/66318

Journal

PHYSICAL REVIEW D

DOI

https://doi.org/10.1103/physrevd.85.083510

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Linear Contrasts for Time Series Data with Non-Normal Innovations: An Application to a Real Life Data Yıldırım, Özgecan; Yozgatlıgil, Ceylan; Şenoğlu, Birdal (2017-12-08) Yıldırım et al. [5] estimated the model parameters and introduced a test statistic in one-way classification AR(1) model under the assumption of independently and identically distributed (iid) error terms having Student’s t distribution, see also [4]. In this study, we extend their study to linear contrasts which is a well-known and widely used comparison method when the null hypothesis about the equality of the treatment means is rejected, see [3], [4]. See also [1] and [2] in the context of ANOVA. A test ...
Comment on 'Rockfall avalance deposits associated with normal faulting in the NW of the Cankiri basin: implications for the post-collisional tectonic evolution of the Neo-Tethyan suture zone' by G. Seyitoglu, N. Kazanci, L. Karadenizli, S. Sen, B. Varol, and T. Karabiyikoglu Kaymakcı, Nuretdin (Wiley, 2003-04-01) Seyitoglu et al. (2000) described their interpretation, based on a single fault surface and rockfall avalanche deposits previously mapped as a W-vergent thrust klippen above the Neogene successions in the Hancili Basin, that in central Anatolia there was a single extensional basin throughout the Miocene - Early Pliocene. It was later fragmented by a structural high of Neo-Tethyan ophiolitic basement bounded by an E-vergent thrust fault in the east along the western margin of the Cankiri Basin and a west-dip...
Searching for subspace trails and truncated differentials Leander, Gregor; Tezcan, Cihangir; Wiemer, Friedrich (2018-01-01) Grassi et al. [Gra+16] introduced subspace trail cryptanalysis as a generalization of invariant subspaces and used it to give the first five round distinguisher for Aes. While it is a generic method, up to now it was only applied to the Aes and Prince. One problem for a broad adoption of the attack is a missing generic analysis algorithm. In this work we provide efficient and generic algorithms that allow to compute the provably best subspace trails for any substitution permutation cipher.
Strongly convergent method to solve one-dimensional quantum problems Taşeli, Hasan (1997-07-01) Vargas et al. [Phys. Rev. E 53, 1954 (1996)] presented a numerical matrix method to solve the one-dimensional Schrodinger equation subject to Dirichlet boundary conditions. It is a well-known fact that the eigensolutions of such a confined system converge asymptotically to those of the corresponding unbounded problem as the boundary value increases. However, it is verified computationally that the results given by Vargas et al. are inaccurate, especially for the excited states of the perturbed oscillator Ha...
SLOW ROTATIONAL PERTURBATIONS OF FRIEDMANN UNIVERSES - REPLY BAYIN, SS (Springer Science and Business Media LLC, 1992-01-01) We point out that the conclusions of a recent Letter by Yavuz et al. are based on a misunderstanding of basic perturbation theory.

Citation Formats

S. E. Hong, E. D. Stewart, and H. Zoe, “Anthropic likelihood for the cosmological constant and the primordial density perturbation amplitude,” PHYSICAL REVIEW D, pp. 0–0, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/66318.