Strong constraint on ever-presentΛ

نویسندگان

چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

A Strong Constraint on Ever-Present Lambda

We show that the causal set approach to creating an ever-present cosmological ’constant’ in the expanding universe is strongly constrained by the isotropy of the microwave background. Fluctuations generated by stochastic lambda generation which are consistent with COBE and WMAP observations are far too small to dominate the expansion dynamics at z < 1000 and so cannot explain the observed late-...

متن کامل

Cosmic Censorship: As Strong As Ever

Spacetimes which have been considered counterexamples to strong cosmic censorship are revisited. We demonstrate the classical instability of the Cauchy horizon inside charged black holes embedded in de Sitter spacetime for all values of the physical parameters. The relevant modes that maintain the instability, in the regime which was previously considered stable, originate as outgoing modes nea...

متن کامل

Commentary: Can 'many weak' instruments ever be 'strong'?

Investigations into the aetiology of common complex diseases based on observational data should make use of any opportunity to reduce bias due to unobserved confounding. In this context, it has become popular to exploit instrumental variable (IV) methods via Mendelian randomization but the key to success lies in finding suitable genetic instruments. Genome-wide association studies are increasin...

متن کامل

Strong CMB Constraint On P -Wave Annihilating Dark Matter

We consider a dark sector consisting of dark matter that is a Dirac fermion and a scalar mediator. This model has been extensively studied in the past. If the scalar couples to the dark matter in a parity conserving manner then dark matter annihilation to two mediators is dominated by the P -wave channel and hence is suppressed at very low momentum. The indirect detection constraint from the an...

متن کامل

Strong polynomiality of resource constraint propagation

Constraint-based schedulers have been widely successful to tackle complex, disjunctive and cumulative, scheduling applications by combining tree search and constraint propagation. The constraint-propagation step is a fixpoint algorithm that applies pruning operators to tighten the release and due dates of activities using precedence or resource constraints. A variety of pruning operators for re...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Physical Review D

سال: 2007

ISSN: 1550-7998,1550-2368

DOI: 10.1103/physrevd.75.067301