299 citations · 469 across the 12 of their papers we have counts for
12 papers
Bohmian Quantum Cosmology from the Wheeler-DeWitt Equation
Spyros Basilakos, Gerasimos Kouniatalis, Emmanuel N. Saridakis +1
We construct a Bohmian quantum cosmological model for a spatially flat Friedmann Robertson Walker universe filled with a single scalar field whose potential provides a unified desc…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
Gravitational wave signatures from reheating in Chern-Simons running-vacuum cosmology
Charalampos Tzerefos, Theodoros Papanikolaou, Spyros Basilakos +2
Within the context of a Chern-Simons running-vacuum-model (RVM) cosmology, one expects an early-matter dominated (eMD) reheating period after RVM inflation driven by the axion fiel…
Gravitational-wave signatures of gravito-electromagnetic couplings
Theodoros Papanikolaou, Charalampos Tzerefos, Salvatore Capozziello +1
Gravitational waves (GWs) can undoubtedly serve as a messenger from the early Universe acting as well as a novel probe of the underlying gravity theory. In this work, motivated by…
Observable Signatures of No-Scale Supergravity in NANOGrav
Spyros Basilakos, Dimitri V. Nanopoulos, Theodoros Papanikolaou +2
In light of NANOGrav data we provide for the first time possible observational signatures of Superstring theory. Firstly, we work with inflection-point inflationary potentials natu…
Revisiting string-inspired running-vacuum models under the lens of light primordial black holes
Theodoros Papanikolaou, Charalampos Tzerefos, Spyros Basilakos +2
Light primordial black holes (PBHs) with masses can interestingly dominate the Universe's energy budget and give rise to early matter-dominated (eMD…
Dark energy from topology change induced by microscopic Gauss-Bonnet wormholes
Stylianos A. Tsilioukas, Emmanuel N. Saridakis, Charalampos Tzerefos
It is known that the appearance of microscopic objects with distinct topologies and different Euler characteristics, such as instatons and wormholes, at the spacetime-foam level in…
Induced gravitational waves from flipped SU(5) superstring theory at
Spyros Basilakos, Dimitri V. Nanopoulos, Theodoros Papanikolaou +2
The no-scale flipped SU(5) superstring framework constitutes a very promising paradigm for physics below the Planck scale providing us with a very rich cosmological phenomenology i…
Gravitational wave signatures of no-scale Supergravity in NANOGrav and beyond
Spyros Basilakos, Dimitri V. Nanopoulos, Theodoros Papanikolaou +2
In this Letter, we derive for the first time a characteristic three-peaked GW signal within the framework of no-scale Supergravity, being the low-energy limit of Superstring theory…
Scalar induced gravitational waves in modified teleparallel gravity theories
Charalampos Tzerefos, Theodoros Papanikolaou, Emmanuel N. Saridakis +1
Primordial black holes (PBHs) forming out of the collapse of enhanced cosmological perturbations provide access to the early Universe through their associated observational signatu…
No constraints for gravity from gravitational waves induced from primordial black hole fluctuations
Theodoros Papanikolaou, Charalampos Tzerefos, Spyros Basilakos +1
Primordial black hole (PBH) fluctuations can induce a stochastic gravitational wave background at second order, and since this procedure is sensitive to the underlying gravitationa…
Scalar induced gravitational waves from primordial black hole Poisson fluctuations in gravity
Theodoros Papanikolaou, Charalampos Tzerefos, Spyros Basilakos +1
The gravitational potential of a gas of initially randomly distributed primordial black holes (PBH) can induce a stochastic gravitational-wave (GW) background through second-order…