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11 papers · 2 filters
Dark Energy-Dark Matter Interaction from the Abell Cluster A586
Orfeu Bertolami, Francisco Gil Pedro, Morgan Le Delliou
We find that deviation from the virial equilibrium of the Abell Cluster A586 yields evidence of the interaction between dark matter and dark energy. We argue that this interaction…
Parametric Resonance and Cosmological Gravitational Waves
Paulo M. Sá, Alfredo B. Henriques
We investigate the production of gravitational waves due to quantum fluctuations of the vacuum during the transition from the inflationary to the radiation-dominated eras of the un…
Intergalactic absorption and blazar gamma-ray spectra
Massimo Persic, Alessandro De Angelis
The distribution of TeV spectral slopes versus redshift for currently known TeV blazars (16 sources with z<0.21, and one with z>0.25) is essentially a scatter plot with hardly any…
Solar system tests of scalar field models with an exponential potential
J. Paramos, O. Bertolami
We consider a scenario where a scalar field has dynamics ruled by an exponential potential, such as those arising from some quintessence type models, and aim at obtaining phenomeno…
Magnetized strange quark matter and magnetized strange quark stars
R. Gonzalez Felipe, A. Perez Martinez, H. Perez Rojas +1
Strange quark matter could be found in the core of neutron stars or forming strange quark stars. As is well known, these astrophysical objects are endowed with strong magnetic fiel…
Do f(R) theories matter?
O. Bertolami, J. Paramos
We consider a modified action functional with a non-minimum coupling between the scalar curvature and the matter Lagrangian, and study its consequences on stellar equilibrium. Part…