Cluster counts: Calibration issue or new physics?

Self-Calibration of Cluster Dark Energy Studies: Counts in Cells

Cluster number counts can constrain the properties of dark energy if and only if the evolution in the relationship between observable quantities and the cluster mass can be calibrated. Next generation surveys with ∼ 10 clusters will have sufficient statistics to enable some degree of self-calibration. The excess variance of counts due to the clustering of clusters provides such an opportunity a...

NEW OR RARE CHROMOSOME COUNTS IN TEN SPECIES OF COUSINIA FROM IRAN (I)

The meiotic chromosome counts are reported in 10 species of the genus Cousinia including: C. adenostegia, C. antonowii, C. chaetocephala, C. dasylepis, C. eriobasis, C. freynii, C. prasina, C. rechingerorum, C. termei and C. trachyphyllaria from Iran. Specimens have been collected from different parts of Iran out of which, eight species are considered to be new and two provide confirmation of t...

NEW OR RARE CHROMOSOME COUNTS IN TEN SPECIES OF COUSINIA FROM IRAN-II

In the present study, choromosome numbers of 10 species of the genus Cousinia including: C. bienerti (n=13), C. decipiens (n=13), C. deserti (n=12), C. esfandiari (n=13), C. komarowii (n=13), C. lepida (n=13), C. neurocentra (n=12), C. piptocephala (n=13), C. smirnowii (n=12)and C. turcomanica (n=13) are reported from Iran. Specimens have been collected from Semnan and Khorasan Provinces. Nine ...

Ultrahigh Energy Cosmic Rays: Old Physics or New Physics?

We consider the advantages of and the problems associated with hypotheses to explain the origin of ultrahigh energy cosmic rays (UHECR: E > 10 EeV) and the “trans-GZK” cosmic rays (TGZK: E > 100 EeV) both through (‘old physics” (acceleration in cosmic sources) and “new physics” (new particles, topological defects, fat neutrino cross sections, Lorentz invariance violation).

Medical Malpractice: A Preventable or Inevitable Issue