Papers by Mairi Sakellariadou
Physical Review D, 2015
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Journal of Cosmology and Astroparticle Physics, 2015
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Noncommutative spectral geometry offers a purely geometric explanation for the standard model of ... more Noncommutative spectral geometry offers a purely geometric explanation for the standard model of particle physics, including a geometric explanation for the origin of the Higgs field. Within this framework, gravity together with the electroweak and the strong forces are all described as purely gravitational forces on a unified noncommutative spacetime. In this letter, we infer a constraint on the parameter characterising the coupling constants at unification, by linearising the field equations in the limit of weak gravitational fields generated by a rotating gravitational source and by making use of the recent experimental data obtained by Gravity Probe B. We find a lower bound on the Weyl term appearing in the noncommutative spectral action, namely \beta > 1/ (10^6 m), which is much stronger than any limit imposed so far to curvature squared terms.
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Journal of Cosmology and Astroparticle Physics, 2014
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Journal of High Energy Physics, 2011
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Physical Review D, 2011
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Journal of Physics: Conference Series, 2012
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Journal of Physics: Conference Series, 2013
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Journal of Cosmology and Astroparticle Physics, 2013
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Journal of Cosmology and Astroparticle Physics, 2013
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Journal of High Energy Physics, 2010
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Journal of Cosmology and Astroparticle Physics, 2013
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Physical Review D, 1993
We present a class of exact solutions to the constraint equations of General Relativity coupled t... more We present a class of exact solutions to the constraint equations of General Relativity coupled to a Klein - Gordon field, these solutions being isotropic but not homogeneous. We analyze the subsequent evolution of the consistent Cauchy data represented by those solutions, showing that only certain special initial conditions eventually lead to successfull Inflationary cosmologies. We argue, however, that these initial conditions are precisely the likely outcomes of quantum events occurred before the inflationary era.
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Journal of High Energy Physics, Jan 1, 2010
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Arxiv preprint arXiv:1105.1784, Jan 1, 2011
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Journal of Cosmology and Astroparticle Physics, 2014
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In the context of SUSY GUTs, GUT scale cosmic strings formed at the end of hybrid inflation are c... more In the context of SUSY GUTs, GUT scale cosmic strings formed at the end of hybrid inflation are compatible with currently available CMB measurements. The maximum allowed cosmic strings contribution to the CMB data constrains the free parameters (mass scales, couplings) of inflationary models. For F-term inflation either the superpotential coupling must be fine tuned or one has to invoke
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Papers by Mairi Sakellariadou