نتایج جستجو برای: angular power spectrum aps
تعداد نتایج: 760576 فیلتر نتایج به سال:
It is demonstrated that omega(-4/3) law of the power spectrum, with the angular frequency omega in dissipative flows, is produced by the emission of dispersive waves from the antikink of an congested domain. The analytic theory predicts that the spectrum is proportional to omega(-2) for relatively low frequency and omega(-4/3) for high frequency.
Carrier sensing is a key mechanism that enables decentralized sharing of unlicensed spectrum. However, carrier sensing in its current form is fundamentally unsuitable when devices transmit at different power levels, a scenario increasingly common given the diversity of Wi-Fi APs in the market and the need for WiFi’s co-existence with new upcoming standards such as LAA/LWA. The primary contribut...
Under the standard model for recombination of the primeval plasma, and the cold dark matter model for structure formation, recent measurements of the first peak in the angular power spectrum of the cosmic microwave background temperature indicate the spatial geometry of the universe is nearly flat. If sources of Ly α resonance radiation, such as stars or active galactic nuclei, were present at ...
We calculate the expected angular power spectrum of the temperature fluctuations in the microwave background radiation (MBR) generated in the quasi-steady state cos-mology (QSSC). The paper begins with a brief description of how the background is produced and thermalized in the QSSC. We then discuss within the framework of a simple model, the likely sources of fluctuations in the background due...
BICEP is a bolometric polarimeter designed to measure the inflationary B-mode polarization of the cosmic microwave background (CMB) at degree angular scales. During three seasons of observing at the South Pole (2006 through 2008), BICEP mapped ∼ 2% of the sky chosen to be uniquely clean of polarized foreground emission. Here we present initial results derived from a subset of the data acquired ...
Background Imaging of Cosmic Extragalactic Polarization (Bicep) is a bolometric polarimeter designed to measure the inflationary B-mode polarization of the cosmic microwave background (CMB) at degree angular scales. During three seasons of observing at the South Pole (2006 through 2008), Bicep mapped ∼2% of the sky chosen to be uniquely clean of polarized foreground emission. Here, we present i...
We present new predictions for temperature (on small angular scales) and polarization (on large angular scales) CMB anisotropies induced during the epoch of reionization (EoR). Using a novel method calibrated from radiation-hydrodynamic simulations we model the EoR in large volumes (L & 2 Gpc/h). We find that the EoR contribution to the kinetic SunyaevZel’dovich power spectrum (patchy kSZ) rang...
We study the angular power spectrum estimate in order to search for large-scale anisotropies in the arrival directions distribution of the highest-energy cosmic rays. We show that this estimate can be performed even with a coverage of the sky going to zero in some part of the sky. The recovered power spectrum is equivalent to the full sky one at the condition that the anisotropies are stationna...
Complex moments of the local power spectrum (CMP) are investigated in a multiscale context. The multiscale CMPs are shown to approximate well the 1D angular Fourier transform of the band in question. This observation is used to derive further properties of the power spectrum in terms of texture orientations or n-folded symmetry patterns. A method is presented to approximate the power spectrum u...
If the Universe had a large curvature before inflation there is a deviation from the scale invariant perturbations of the inflaton at the beginning of inflation. This may have some effect on the cosmic microwave background anisotropy at large angular scales. We calculate the density perturbations for both open and closed universe cases using the Bunch-Davies vacuum condition on the initial stat...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید