Viable Singularity-Free f(R) Gravity Without a Cosmological Constant
  Several authors have argued that self-consistent $f(R)$ gravity models
distinct from $\Lambda $CDM are almost ruled out. Confronting such claims, we
present a particular two-parameter $f(R)$ model that: (a) is cosmologically
viable and distinguishable from $\Lambda $CDM; (b) is compatible with the
existence of relativistic stars; (c) is free of singularities of the Ricci
scalar during the cosmological evolution and (d) allows the addition of high
curvature corrections that could be relevant for inflation.
