A5082814796- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Noncommutative and Quantum Gravity Theories
- Solar and Space Plasma Dynamics
- RNA and protein synthesis mechanisms
- Genomics and Phylogenetic Studies
- Particle physics theoretical and experimental studies
- Machine Learning in Bioinformatics
- Protein Structure and Dynamics
- Stellar, planetary, and galactic studies
- Advanced Differential Geometry Research
- Geophysics and Gravity Measurements
- Quantum Mechanics and Applications
- Astrophysical Phenomena and Observations
- Advanced Operator Algebra Research
- Advanced Thermodynamics and Statistical Mechanics
Cineca
2024
AREA Science Park
2024
National Supercomputing Center in Wuxi
2024
The Abdus Salam International Centre for Theoretical Physics (ICTP)
2019-2021
Institute for Fundamental Physics of the Universe
2021
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2020
Gran Sasso Science Institute
2016-2019
We consider the branch of projectable Hořava-Lifshitz model which exhibits ghost instabilities in low energy limit. It turns out that, due to Lorentz violating structure and presence a finite strong coupling scale, vacuum decay rate into photons is tiny wide range phenomenologically acceptable parameters. The understood as cutoff on ghosts' spatial momenta, can be raised up Λ ∼ 10 TeV. At lower gravity equivalent General Relativity supplemented by fluid with small positive sound speed...
Here we review the present status of modelling and searching for primordial non-Gaussianity cosmological perturbations. After introducing models generation during inflation, discuss search non-Gaussian signatures in Cosmic Microwave Background Large-Scale Structure Universe.
Inflationary perturbations are approximately Gaussian and deviations from Gaussianity usually calculated using in-in perturbation theory. This method, however, fails for unlikely events on the tail of probability distribution: in this regime non-Gaussianities important theory breaks down $|\zeta| \gtrsim |f_{\rm \scriptscriptstyle NL}|^{-1}$. In paper we show that is amenable to a semiclassical treatment, $\hbar \to 0$. limit wavefunction Universe can be saddle-point, corresponding...
We compute cosmological perturbations for a generic self-gravitating media described by four derivatively- coupled scalar fields. Depending on the internal symmetries of action fields, one can describe perfect fluids, superfluids, solids and supersolids media. Symmetries dictate both dynamical thermodynamical properties Generically, include, besides gravitational potential, an additional non-adiabatic mode associated with entropy per particle {\sigma}. While fluids are adiabatic {\sigma}...
We describe some key astrophysical processes driving the formation and evolution of black hole binaries different nature, from stellar-mass to supermassive systems. In first part, we focus on mainstream channels proposed for stellar mass relevant ground-based gravitational wave detectors, namely {\it field} dynamical} scenarios. For field scenario, highlight steps in binary, including transfer, supernovae explosions kicks, common envelope emission. dynamical main physical involved star...
A bstract We study primordial non-gaussianity in supersolid inflation. The dynamics of is formulated terms an effective field theory based on four scalar fields with a shift symmetric action minimally coupled gravity. In the sector, there are two phonon-like excitations kinetic mixing stemming from completely spontaneous breaking diffeomorphism. squeezed configuration, f NL perturbations angle dependent and not proportional to slow-roll parameters showing blunt violation Maldacena...
Abstract Protein Language Models offer a new perspective for addressing challenges in structural biology, while relying solely on sequence information. Recent studies have investigated their effectiveness forecasting shifts thermodynamic stability caused by single amino acid mutations, task known its complexity due to the sparse availability of data, constrained experimental limitations. To tackle this problem, we introduce two key novelties: leveraging Model that incorporates Multiple...
Abstract Motivation Protein language models offer a new perspective for addressing challenges in structural biology, while relying solely on sequence information. Recent studies have investigated their effectiveness forecasting shifts thermodynamic stability caused by single amino acid mutations, task known its complexity due to the sparse availability of data, constrained experimental limitations. To tackle this problem, we introduce two key novelties: leveraging protein model that...
Generic massive gravity models in the unitary gauge correspond to a self-gravitating medium with six degrees of freedom (d.o.f.). It is widely believed that d.o.f. have an unavoidable ghostlike instability; however, corresponding has stable phononlike excitations. The apparent contradiction solved by presence nonvanishing background pressure and energy density opens up stability window. result confirmed looking at linear on expanding Universe, recovering flat space conditions small...
Perfect fluids are modeled by using an effective field theory approach which naturally gives a self-consistent and unambiguous description of the intrinsic non-adiabatic contribution to pressure variations. We study impact entropy perturbation on superhorizon dynamics curvature ${\cal R}$ in dark sector. The sector, made matter energy is described as single perfect fluid. non-perturbative vorticity's Weinberg theorem violation for also studied.
We study the dynamics of inflation driven by an adiabatic self-gravitating medium, extending previous works on fluid and solid inflation. Such a class media comprises perfect fluids, zero finite temperature solids. By using effective field theory description, we compute power spectrum for scalar curvature perturbation constant energy density hypersurface ζ comoving in case slow-roll, super slow-roll w-media inflation, inflationary phase with w range −1 <w <−1/3. A similar computation is done...
A bstract Inflation driven by a generic self-gravitating medium is an interesting alternative to study the impact of spontaneous spacetime symmetry breaking during quasi de-Sitter phase, in particular 4-dimensional diffeomorphism invariance GR spontaneously broken down I SO (3). The effective description based on four scalar fields that describe excitations supersolid. There are two phonon-like propagating degrees freedom mix non-trivially both at early and late times and, after exiting...
We show that the effective theory describing single component continuous media with a linear and constant equation of state form p=wρ is invariant under 1-parameter family disformal transformations. In special case w=1/3 (ultrarelativistic gas), such reduces to conformal As examples, perfect fluids, irrotational dust (mimetic matter) homogeneous isotropic solids are discussed.
We address the question whether a medium featuring p+ρ =0, dubbed Λ-medium, has to be necessarily cosmological constant. By using effective field theory, we show that this is not case for class of media comprising perfect fluids, solids and special super solids, providing an explicit construction. The low energy excitations are non trivial lensing, growth large scale structures can used clearly distinguish Λ-media from