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Time delays across saddles as a test of modified gravity
Joao Magueijo, Ali Mozaffari
Modified gravity theories can produce strong signals in the vicinity of the saddles of the total gravitational potential. In a sub-class of these models this translates into diverg…
Cosmology with a spin
Joao Magueijo, T. G. Zlosnik, T. W. B. Kibble
Using the chiral representation for spinors we present a particularly transparent way to generate the most general spinor dynamics in a theory where gravity is ruled by the Einstei…
New ground state for quantum gravity
Joao Magueijo, Laura Bethke
In this paper we conjecture the existence of a new "ground" state in quantum gravity, supplying a wave function for the inflationary Universe. We present its explicit perturbative…
Horava-Lifshitz theory as a Fermionic Aether in Ashtekar gravity
Stephon Alexander, Joao Magueijo, Antonino Marciano
We show how Hořava-Lifshitz (HL) theory appears naturally in the Ashtekar formulation of relativity if one postulates the existence of a fermionic field playing the role of aether.…
Saddle stresses for generic theories with a preferred acceleration scale
Joao Magueijo, Ali Mozaffari
We show how scaling arguments may be used to generate templates for the tidal stresses around saddles for a vast class of MONDian theories {\it detached from their obligations as d…