299 citations · 603 across the 28 of their papers we have counts for
28 papers
Inflation driven by repulsive-like primordial black holes
Konstantinos Dialektopoulos, Theodoros Papanikolaou, Vasilios Zarikas
We review a new natural inflationary mechanism operated by repulsive-like primordial black holes (PBHs). In particular, working within the ``Swiss - Cheese" cosmological framework,…
Primordial black hole driven cosmic acceleration
Konstantinos Dialektopoulos, Theodoros Papanikolaou, Vasilios Zarikas
We propose a natural mechanism for cosmic acceleration driven by primordial black holes (PBHs) with repulsive behavior, within a ''Swiss Cheese'' cosmological framework. Considerin…
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.…
Primordial black holes as cosmic expansion accelerators
Konstantinos Dialektopoulos, Theodoros Papanikolaou, Vasilios Zarikas
We propose a novel and natural mechanism for cosmic acceleration driven by primordial black holes (PBHs) exhibiting repulsive behavior. Using a new ``Swiss Cheese'' cosmological ap…
Renormalization group approaches to Quantum Gravity and Tensions in Modern Cosmology
Vasilios Zarikas
Asymptotic Safety is a promising framework towards the understanding, in a non-perturbative way, of Quantum Gravity. It treats the Newton's constant G_N and the cosmological consta…
Asymptotic Safety and the Cosmic Coincidence Problem
Vasilios Zarikas
Asymptotic Safety (AS) Paradigm is an interesting set of ideas and methods towards a meaningful quantization of Gravity. A brief review of phenomenological consequences in the cont…
Renormalization Group-Improved Gravitational Action: A Lagrangian Framework
Alfio Bonanno, Konstantinos F. Dialektopoulos, Vasilios Zarikas
A new approach for embedding the renormalization group running of Newton's constant and cosmological constant in gravity is proposed. This approach is based on a gravitational Lagr…
Dark energy reconstruction analysis with artificial neural networks: Application on simulated Supernova Ia data from Rubin Observatory
Ayan Mitra, Isidro Gómez-Vargas, Vasilios Zarikas
In this paper, we present an analysis of Supernova Ia (SNIa) distance moduli and dark energy using an Artificial Neural Network (ANN) reconstruction based on LSST simulated…
Phenomenological footprints of Lambda varying gravity theories inspired from quantum gravity models in the multi-messenger era
Michael R. R. Good, Vasilios Zarikas
An interesting phenomenological consequence of Lambda varying gravity theories inspired by quantum gravity models is reported. The treatment in the present work is quite general an…
Extreme electron acceleration with fixed radiation energy
Michael R. R. Good, Chiranjeeb Singha, Vasilios Zarikas
We examine the extreme situation of radiation from an electron that is asymptotically accelerated to the speed of light, resulting in finite emission energy. The analytic solution…
Swiss-cheese cosmologies with variable and from the renormalization group
Fotios K. Anagnostopoulos, Alfio Bonanno, Ayan Mitra +1
A convincing explanation for the nature of the dark energy and dark matter is still missing. In recent works a RG-improved swiss-cheese cosmology with an evolving cosmological cons…
Constraining the swiss-cheese IR-fixed point cosmology with cosmic expansion
Ayan Mitra, Vasilios Zarikas, Alfio Bonanno +2
In a recent work, it has been proposed that the recent cosmic passage to a cosmic acceleration era is the result of the existence of small anti-gravity sources in each galaxy and c…
IR quantum gravity solves naturally cosmic acceleration and its coincidence problem
Fotios K. Anagnostopoulos, Georgios Kofinas, Vasilios Zarikas
The novel idea is that the undergoing accelerated expansion of the universe happens due to infrared quantum gravity modifications at intermediate astrophysical scales of galaxies o…
Effective field equations and scale-dependent couplings in gravity
Alfio Bonanno, Georgios Kofinas, Vasilios Zarikas
A new set of field equations for a space-time dependent Newton's constant and cosmological constant in the presence of matter is presented. We prove that it represent…
Singularities and Phenomenological aspects of Asymptotic Safe Gravity
Vasilios Zarikas, Georgios Kofinas
Asymptotic Safety (AS) Program for quantum gravity keeps the same fields and symmetries with General Relativity and studies the associated gravitational action as a fundamental par…
Electroweak baryogenesis by primordial black holes in Brans-Dicke modified gravity
Georgios Aliferis, Vasilios Zarikas
A successful baryogenesis mechanism is proposed in the cosmological framework of Brans-Dicke modified gravity. Primordial black holes with small mass are produced at the end of the…
Binary Black Hole Information Loss Paradox & Future Prospects
Ayan Mitra, Pritam Chattopadhyay, Goutam Paul +1
Various techniques to tackle the black hole information paradox have been proposed. A new way out to tackle the paradox is via the use of a pseudo-density operator. This approach h…
Constraining the Asymptotically Safe Cosmology: cosmic acceleration without dark energy
Fotios K. Anagnostopoulos, Spyros Basilakos, Georgios Kofinas +1
A recently proposed Asymptotically Safe cosmology provides an elegant mechanism towards understanding the nature of dark energy and its associated cosmic coincidence problem. The u…
A solution of the dark energy and its coincidence problem based on local antigravity sources without fine-tuning or new scales
Georgios Kofinas, Vasilios Zarikas
A novel idea is proposed for a natural solution of the dark energy and its cosmic coincidence problem. The existence of local antigravity sources, associated with astrophysical mat…
Asymptotically Safe gravity and non-singular inflationary Big Bang with vacuum birth
Georgios Kofinas, Vasilios Zarikas
General non-singular accelerating cosmological solutions for an initial cosmic period of pure vacuum birth era are derived. This vacuum era is described by a varying cosmological "…
Avoidance of singularities in asymptotically safe Quantum Einstein Gravity
Georgios Kofinas, Vasilios Zarikas
New general spherically symmetric solutions have been derived with a cosmological "constant" Λas a source. This Λfield is not constant but it satisfies the properties of the asympt…
Efficient electroweak baryogenesis by black holes
Georgios Aliferis, Georgios Kofinas, Vasilios Zarikas
A novel cosmological scenario, capable to generate the observed baryon number at the electroweak scale for very small CP violating angles, is presented. The proposed mechanism can…
5-dimensional braneworld with gravitating Nambu-Goto matching conditions
Georgios Kofinas, Vasilios Zarikas
We continue the investigation of a recent proposal on alternative matching conditions for self-gravitating defects which generalize the standard matching conditions. The reasoning…
A solution of the coincidence problem based on the recent galactic core black hole mass density increase
Georgios Kofinas, Vasilios Zarikas
A mechanism capable to provide a natural solution to two major cosmological problems, i.e. the cosmic acceleration and the coincidence problem, is proposed. A specific brane-bulk e…