Search results for: L. Raul Abramo

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article

Measuring large‐scale structure with quasars in narrow‐band filter surveys

L. Raul Abramo, Michael A. Strauss, Marcos Lima, Carlos Hernández‐Monteagudo, more

Monthly Notices of the Royal Astronomical Society > 423 > 4 > 3251 - 3267

We show that a large‐area imaging survey using narrow‐band filters could detect quasars in sufficiently high number densities, and with more than sufficient accuracy in their photometric redshifts, to turn them into suitable tracers of large‐scale structure. If a narrow‐band optical survey can detect objects as faint as i= 23, it could reach volumetric number densities as high as 10⁻⁴ h³ Mpc⁻³ (comoving)...

article

The full Fisher matrix for galaxy surveys

L. Raul Abramo

Monthly Notices of the Royal Astronomical Society > 420 > 3 > 2042 - 2057

Starting from the Fisher matrix for counts in cells, we derive the full Fisher matrix for surveys of multiple tracers of large‐scale structure. The key step is the ‘classical approximation’, which allows us to write the inverse of the covariance of the galaxy counts in terms of the naive matrix inverse of the covariance in a mixed position‐space and Fourier‐space basis. We then compute the Fisher...

article

Signature of the interaction between dark energy and dark matter in galaxy clusters

Elcio Abdalla, L. Raul Abramo, Laerte Sodré, Bin Wang

Physics Letters B > 2009 > 673 > 2 > 107-110

We investigate the influence of an interaction between dark energy and dark matter upon the dynamics of galaxy clusters. We obtain the general Layser–Irvine equation in the presence of interactions, and find how, in that case, the virial theorem stands corrected. Using optical, X-ray and weak lensing data from 33 relaxed galaxy clusters, we put constraints on the strength of the coupling between the...

article

Back Reaction of Gravitational Radiation on the Schwarzschild Black Hole

L. Raul Abramo, Fabio Finelli

General Relativity and Gravitation > 2001 > 33 > 2 > 339-352

We address some of the issues that appear in the study of back reaction in Schwarzschild backgrounds. Our main object is the effective energy-momentum tensor (EEMT) of gravitational perturbations. It is commonly held that only asymptotically flat or radiation gauges can be employed for these purposes. We show that the traditional Regge–Wheeler gauge for perturbations of the Schwarzschild metric can...

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BACK-REACTION (1)
BLACK HOLE (1)
COSMOLOGY: THEORY (1)
GRAVITATIONAL WAVES (1)
LARGE‐SCALE STRUCTURE OF THE UNIVERSE (1)
LARGE‐SCALE STRUCTURE OF UNIVERSE (1)
QUASARS: GENERAL (1)

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Wiley (2)
Elsevier (1)
Springer (1)

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Search results for: L. Raul Abramo

Measuring large‐scale structure with quasars in narrow‐band filter surveys

The full Fisher matrix for galaxy surveys

Signature of the interaction between dark energy and dark matter in galaxy clusters

Back Reaction of Gravitational Radiation on the Schwarzschild Black Hole

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INFONA - science communication portal

Search results for: L. Raul Abramo

Measuring large‐scale structure with quasars in narrow‐band filter surveys

The full Fisher matrix for galaxy surveys

Signature of the interaction between dark energy and dark matter in galaxy clusters

Back Reaction of Gravitational Radiation on the Schwarzschild Black Hole

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