نتایج جستجو برای: cmb

تعداد نتایج: 5818  

2006
A. L. Maroto

We explore the possibility that the rest frames of CMB, matter and dark energy differ one from another, i.e. they do not converge on very large scales. In such a case, the usual interpretation of the CMB dipole as being due to the relative motion of the observer with respect to the CMB rest frame is not appropriate. Instead, we find that the measured dipole is due to the observer motion relativ...

Journal: :Stroke 2015
Victor J Del Brutto Mauricio Zambrano Robertino M Mera Oscar H Del Brutto

BACKGROUND AND PURPOSE Prevalence of cerebral microbleeds (CMB) in white and Asian populations range from 4% to 15%. However, there is no information from indigenous Latin American people. We aimed to assess prevalence and cerebrovascular correlates of CMB in stroke-free older adults living in rural Ecuador. METHODS Of 311 Atahualpa residents aged ≥60 years identified during a door-to-door su...

2017
Yasushi Yumura

Objective: This study aimed to evaluate the efficacy and toxicity of cisplatin, methotrexate, and bleomycin (CMB) chemotherapy in patients with advanced, recurrent, or metastatic penile squamous cell carcinoma (PSCC). Methods: The CMB regimen was administered to 12 patients with advanced (n=7), recurrent (n=4), or metastatic (n=1) PSCC. Patients received a total of 21 cycles of CMB between 2002...

2007
L. A. Popa A. Vasile

Distortions of CMB temperature and polarization maps caused by gravitational lensing, observable with high angular resolution and sensitivity , can be used to constrain the sterile neutrino mass, ms, from CMB data alone. We forecast ms >1.75 keV from Planck and ms >4.97 keV from Inflation Probe at 95% CL, by using the CMB weak lensing extraction .

1997
Somnath Bharadwaj Dipak Munshi Tarun Souradeep

In the context of inflationary scenarios, the observed large angle anisotropy of the Cosmic Microwave Background (CMB) temperature is believed to probe the primordial metric perturbations from inflation. Although the perturbations from inflation are expected to be gaussian random fields, there remains the possibility that nonlinear processes at later epochs induce “secondary” non-gaussian featu...

1999
J. Ellis

The Cosmic Microwave Background (CMB) provides a precious window on fundamental physics at very high energy scales, possibly including quantum gravity, GUTs and supersymmetry. The CMB has already enabled defect-based rivals to inflation to be discarded, and will be able to falsify many inflationary models. In combination with other cosmological observations, including those of high-redshift sup...

2002
Ravi Subrahmanyan R. D. Ekers

We examine the prospects for observations of CMB anisotropy with the SKA; we discuss the advantages of interferometric SKA imaging, observing strategies, calibration issues and the achievable sensitivity. Although the SKA will probably operate at cm wavelengths, where discrete source confusion dominates the CMB anisotropy, its extreme sensitivity to point sources will make it possible to subtra...

1999
Martin White

Over the last few years it has become common place to speak of the Cosmic Microwave Background (CMB) anisotropy as the premier laboratory for cosmology and early universe physics. In the titles to most talks the word \anisotropy" is often absent, it being understood that the talk will be about the anisotropy. This is an interesting phenomenon. Consider that when we speak of the CMB we could spe...

Journal: :Physical review letters 2005
Kris Sigurdson Asantha Cooray

We propose a new method for removing gravitational lensing from maps of cosmic microwave background (CMB) polarization anisotropies. Using observations of anisotropies or structures in the cosmic 21 cm radiation, emitted or absorbed by neutral hydrogen atoms at redshifts 10 to 200, the CMB can be delensed. We find this method could allow CMB experiments to have increased sensitivity to a backgr...

2007
Paola Andreani Carlo Baccigalupi

The Cosmic Microwave Background (CMB) physics can be used to constrain the dark energy dynamics: B modes of the polarization of the diffuse CMB emission as well as the polarized signal towards clusters of galaxies are sensitive to the Hubble expansion rate and thus the dark energy abundance in the early stage of cosmic acceleration. The first effect is sourced by gravitational lensing of large ...

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