We review the paradigm of holographic dark energy (HDE), which arises from a theoretical
attempt of applying the holographic principle (HP) to the dark energy (DE) problem. Making …

The properties of the recently discovered Higgs boson together with the absence of new
physics at collider experiments allows us to speculate about consistently extending the …

We argue that the Higgs boson of the Standard Model can lead to inflation and produce
cosmological perturbations in accordance with cosmological observations. An essential …

Scale-invariant (flat) fluctuation spectra are the most natural outcomes of inflation.
Nonetheless current large-scale-structure observations seem to indicate more fluctuation …

Nature's simplest field, the scalar field, has been the protagonist of physical theories for a
long time. Even before the publication of the theory of general relativity G. Nordström …

We show that in all theories with a Lorentz-covariant energy-momentum tensor, such as all
known renormalizable quantum field theories, composite as well as elementary massless …

We discuss the particle physics basis for models of natural inflation with pseudo Nambu-
Goldstone bosons and study the consequences for large-scale structure of the nonscale …

We prove that higher derivative quantum gravity is asymptotically free in all essential
coupling constants by the calculation of one-loop counterterms (correcting the previous …

We investigate gravitational phenomenology in compactified higher-dimensional theories,
with particular emphasis on the consequences in string theory of tensor-induced …

We give a review of conformal supergravity considered as a candidate for a fundamental
theory describing physics at Planck distances. Conformal supergravities are supersymmetric …