Beecroft Institute for Particle Astrophysics and Cosmology

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Constraining Lorentz violation with cosmology

(2008)

Authors:

JA Zuntz, PG Ferreira, TG Zlosnik
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Map-making in small field modulated CMB polarisation experiments: approximating the maximum-likelihood method

(2008)

Authors:

D Sutton, BR Johnson, ML Brown, P Cabella, PG Ferreira, KM Smith
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Living in a Void: Testing the Copernican Principle with Distant Supernovae

(2008)

Authors:

Timothy Clifton, Pedro G Ferreira, Kate Land
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Beyond Two Dark Energy Parameters

Physical Review Letters American Physical Society (APS) 100:24 (2008) 241302

Authors:

Devdeep Sarkar, Scott Sullivan, Shahab Joudaki, Alexandre Amblard, Daniel E Holz, Asantha Cooray
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Dark Matter, Modified Gravity and the Mass of the Neutrino

ArXiv 0806.0116 (2008)

Authors:

PG Ferreira, C Skordis, C Zunckel

Abstract:

It has been suggested that Einstein's theory of General Relativity can be modified to accomodate mismatches between the gravitational field and luminous matter on a wide range of scales. Covariant theories of modified gravity generically predict the existence of extra degrees of freedom which may be interpreted as dark matter. We study a subclass of these theories where the overall energy density in these extra degrees of freedom is subdominant relative to the baryon density and show that they favour the presence of massive neutrinos. For some specific cases (such as a flat Universes with a cosmological constant) one finds a conservative lower bound on the neutrinos mass of $m_\nu>0.31$ eV.
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