253 citations · 1.9k across the 111 of their papers we have counts for
19 papers · 1 filter
Dark Matter and Inflation in Supergravity
Andrea Addazi, Maxim Yu. Khlopov
As is well known, the gravitational degrees of freedom contained in (super)gravity lead to Starobinsky's potential, in a one-field setting for inflationary Cosmology tha…
Dark matter and baryogenesis in the Fermi-bounce curvaton mechanism
Andrea Addazi, Stephon Alexander, Yi-Fu Cai +1
We elaborate on a toy-model of matter bounce, in which the matter content is constituted by two fermion species endowed with four fermion interaction term. We describe the curvaton…
Glimpses of black hole formation/evaporation in highly inelastic, ultra-planckian string collisions
Andrea Addazi, Massimo Bianchi, Gabriele Veneziano
We revisit possible glimpses of black-hole formation by looking at ultra-planckian string-string collisions at very high final-state multiplicity. We compare, in particular, previo…
Brane Bounce from logarithmic entropic corrections in the bulk
Andrea Addazi
We calculate new corrections to the Brane-world dynamics, lying in a 5D Schwarzschild-De Sitter black hole, generalizing the result of Nojiri, Odintsov and Ogushi (NOO) in Ref.\cit…
(Anti)evaporation of Dyonic Black Holes in string-inspired dilaton -gravity
Andrea Addazi
We discuss dyonic black hole solutions in the case of -gravity coupled with a dilaton and two gauge bosons. The study of such a model is highly motivated from string theory.…
: vacuum energy and virtual black-holes
Andrea Addazi
We discuss other contributions to the vacuum energy of quantum field theories and quantum gravity, which have not been considered in literature. As is well known, the presence of v…
Chaotic instantons in scalar field theory
Andrea Addazi
We consider a new class of instantons in context of quantum field theory of a scalar field coupled with a chaotic background source field. We show how the instanton associated to t…
Born-Infeld condensate as a possible origin of neutrino masses and dark energy
Andrea Addazi, Salvatore Capozziello, Sergei Odintsov
We discuss the possibility that a Born-Infeld condensate coupled to neutrinos can generate both neutrino masses and an effective cosmological constant. In particular, an effective…
Weak Gravity Conjecture as a Razor Criterium for Exotic D-brane instantons
Andrea Addazi
We discuss implications of Weak gravity conjecture (WGC) for exotic D-brane instantons. In particular, WGC leads to indirect stringent bounds on non-perturbative superpotentials ge…
More about the Instanton/Soliton/Kink correspondence
Andrea Addazi
We demonstrate that all gauge instantons in a Yang-Mills theory, with generic topological vacuum charge K, correspond to soliton solutions and kink scalar fields in …
Limiting First Order Phase Transitions in Dark Gauge Sectors from Gravitational Waves experiments
Andrea Addazi
We discuss the possibility to indirectly test First Order Phase Transitions of hidden sectors. We study the interesting example of a {\it dark standard model} with a deformed param…
Gauged B-L Number and Neutron--Antineutron Oscillation: Long-range Forces Mediated by Baryophotons
Andrea Addazi, Zurab Berezhiani, Yuri Kamyshkov
Transformation of neutron to antineutron is a small effect that has not yet been experimentally observed. %\cite{Phillips:2014fgb}. In principle, it can occur with free neutrons in…
Way-out to the Gravitino problem in intersecting D-brane Pati-Salam models
Andrea Addazi, Maxim Khlopov
We discuss the gravitino problem in contest of the Exotic see-saw mechanism for neutrinos and Leptogenesis, UV completed by intersecting D-branes Pati-Salam models. In the Exotic s…
String completion of an electroweak model
Andrea Addazi, J. W. F. Valle, C. A. Vaquera-Araujo
The extended electroweak symmetry framework "explaining" the number of fermion families is revisited. While -based schemes ca…
Quantum chaos inside space-temporal Sinai billiards
Andrea Addazi
We discuss general aspects of non-relativistic quantum chaos theory of scattering of a quantum particle on a system of a large number of naked singularities. We define such a syste…
A Unified picture of Dark Matter and Dark Energy from Invisible QCD
Andrea Addazi, Antonino Marciano, Stephon Alexander
It has been shown in a companion paper that the late time acceleration of the universe can be accounted for by an extension of the QCD color to a invisible sector (IQCD). I…
Invisible QCD as Dark Energy
Stephon Alexander, Antonino Marcianò, Zhi Yang
We account for the late time acceleration of the Universe by extending the QCD color to a invisible sector (IQCD). If the Invisible Chiral symmetry is broken in the early u…
Dark Energy and Dark Matter from Yang-Mills Condensate and the Peccei-Quinn mechanism
Andrea Addazi, Pietro Donà, Antonino Marcianò
We analyze a model of cold axion Dark Matter weakly coupled with a dark gluon condensate, reproducing Dark Energy. We first review how to recover the Dark Energy behavior using the…
The fate of Schwarzschild-de Sitter Black Holes in gravity
Andrea Addazi, Salvatore Capozziello
The semiclassical effects of antievaporating black holes can be discussed in the framework of gravity. In particular, the Bousso-Hawking-Nojiri-Odinstov antievaporation inst…