Sternberg Astronomical Instuitute

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The Archeops CMB experiment: a unique tool for present and future cosmology

The first goal of the Archeops experiment is to measure the Cosmic Microwave Background (CMB) anisotropy at intermediate scale. Despite the high interest of this range to a precise determination of the total energy density of the Universe as it constrains the normalisation of the whole power spectrum and the first acoustic peak position, no experiment had studied it to date. The second goal of Archeops is the validation of the Planck-HFI techonological choices as both instruments are almost identical in terms of cryogeny, optic, detectors and electronic. Eight monthes only after the February, 8th 2002 flight from Kiruna (Sweden) to Noril'sk (Russia), both objectives have been reached. In this seminar, I'll present the main steps of the analysis from 3K photons detection to power spectrum estimation. Then I'll discuss the cosmological parameter constraints provided by Archeops and by the all set of CMB experiments, eventually combining also non-CMB information.

No. 113

1. News from XXI Symposium on Relativistic Astrophysics, Firenze (Italy), December 9-13, 2002

2. Cosmological perturbations in the chiral model of inflationary expansion of
the Universe

1. News
2. Large-scale perturbations in standard model

Growth rate of large-scale cosmological perturbations is analyzed. Conditions are clarified under which the perturbations enter non-linear regime before their terminations by cosmic vacuum. The conditions are found in terms of the constant parameters of the standard model. No fine tuning is needed.

No. 111

Discovery of Nuclear-Active DM Objects in Solar System (tentatively, electrically charged elementary Planckian black holes)

Two-year monitoring of pair ZnS(Ag) scintillating screens disposed horizontally at ~10 cm one above the other displays an existence of highly correlated events which relative time-shift corresponds to velocity of ~5-10-30 km/s (downward and upward). We attribute the appearance of such ultra-slow and highly penetrating "cosmic-rays" to DArk Electric Matter Objects - daemons, i.e. elementary Planckian black holes carrying an electric charge up to ~10e. They are having been captured from the Galactic disk, by virtue of combined action of the Sun and the Earth, in the near-Earth orbits. The experiment setting up was based on assumptions of (1) rapid (~1 microsecond) decay of a daemon-containing proton, and (2) ejection of numerous Auger electrons, nucleons and their clusters at (re)capturing a new nucleus by daemon. The experiment confirms the both assumptions and reveals the time of the daemon-containing proton decay to be ~ 1 microsecond. The daemon flux through the Earth surface reaches ~10 per sq.km per sec and changes with a half-year period.

No. 110

Some facts that follow from the existence of everywhere regularspherical metrics with axial symmetry.

Regular 2-parametric generalizations of Schwarzschild and Reissner-Nordstrom spherically symmetric metrics and 3-parametric generalization of Kerr metric are considered.= It is shown that the first two metrics have a regular in zero representation, which does= not= contain horizon= lines in standard= spherical= coordinate system. The formula for the low of gravity in a neighborhood of zero is found for the regular= Schwarzschild= metric. A relationship between a quark mass-spectrum and a metric of a curved space-time is discussed.

No. 109

1. News:
the CMBR polarization discovery;
2. Intermediate Mass Black Holes in Astrophysical Objects

A review of recent observations indicating the presence of intermediate mass black holes (~ 10^3 - 10^4) in globular clusters will be given and their possible formation mechanisms will be discussed.

No. 108

Trans-Planckian particle creation in cosmology and ultra-high energy cosmic rays.

Observational constraints on creation of particles induced by hypothetical trans-Planckian effects during the currect stage of the Universe expansion are considered. It is shown that compatibility with the diffuse gamma-ray background measured by the EGRET experiment strongly restricts this creation. In particular, it rules out the possibility to detect signatures of such short distance effects in the CMB temperature anisotropy. On the other hand, a possibility that some part of ultra-high enrgy cosmic rays originates from new trans-Planckian physics remains open.

News from "Science & Ultimate Reality" symposium to be held in Princeton, New Jersey March 15-18.

New dynamical probe of the $\Omega$ parameter" (part II)

New dynamical probe of the $\Omega$ parameter" (part I)