A5035823202- Cosmology and Gravitation Theories
- Particle physics theoretical and experimental studies
- Black Holes and Theoretical Physics
- Galaxies: Formation, Evolution, Phenomena
- Dark Matter and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Neutrino Physics Research
- Noncommutative and Quantum Gravity Theories
- Neuroendocrine regulation and behavior
- Atomic and Subatomic Physics Research
- Geophysics and Gravity Measurements
- Computational Physics and Python Applications
- Neurobiology and Insect Physiology Research
- Advanced Thermodynamics and Statistical Mechanics
- Early Childhood Education and Development
- Quantum Mechanics and Applications
- Geophysics and Sensor Technology
- Neural dynamics and brain function
- Earth Systems and Cosmic Evolution
- Quantum Chromodynamics and Particle Interactions
- Astro and Planetary Science
- Pulsars and Gravitational Waves Research
- Economic Theory and Policy
- Neurotransmitter Receptor Influence on Behavior
- Relativity and Gravitational Theory
University of Warsaw
2013-2025
Sorbonne Université
2016
Centre National de la Recherche Scientifique
2016
Institut d'Astrophysique de Paris
2016
University of Michigan–Ann Arbor
2007-2010
European Organization for Nuclear Research
2010
Korea Institute for Advanced Study
2007
Airedale General Hospital
2001
This chapter of the report "Flavor in era LHC" Workshop discusses theoretical, phenomenological and experimental issues related to flavor phenomena charged lepton sector conserving CP-violating processes. We review current limits main theoretical models for structure fundamental particles. analyze consequences available data, setting constraints on explicit beyond standard model, presenting benchmarks discovery potential forthcoming measurements both at LHC low energy, exploring options...
We show the existence of a general mechanism by which heavy scalar fields can be destabilized during inflation, relying on fact that curvature field space manifold dominate stabilizing force from potential and destabilize inflationary trajectories. describe simple rather universal setup in higher-order operators suppressed large energy scale trigger this instability. This phenomenon prematurely end thereby leading to important observational consequences sometimes excluding models would...
We study cosmological perturbations in two-field inflation, allowing for non-standard kinetic terms. calculate analytically the spectra of curvature and isocurvature modes at Hubble crossing, up to first order slow-roll parameters. also compute numerically evolution from well within radius until end inflation. show explicitly a few examples, including recently proposed model 'roulette' how affect significantly perturbation between crossing
We study models of inflation with two scalar fields and non-canonical kinetic terms, focusing on the case in which curvature isocurvature perturbations are strongly coupled to each other. In regime where a heavy mode can be identified integrated out, we clarify passage from full two-field model an effectively single-field description. However, strong coupling sets new scale system, affects evolution as well beginning validity effective field theory. particular, predictions sensitive relative...
In cascade inflation and some other string models, collisions of mobile branes with or orbifold planes occur lead to interesting cosmological signatures. The fundamental M/string-theory description these is still lacking but it clear that the inflaton looses part its energy form brane matter, e.g. a component tensionless strings. absence description, we assume general barotropic fluid on brane, which absorbs inflaton's energy. modeled by scalar suitable exponential potential arrive at...
We investigate the validity of effective field theory methods and decoupling heavy fields during inflation. Considering models inflation in which inflaton is coupled to a (super-Hubble) degree freedom initially its vacuum state, we find that violations are absent unless there breakdown slow-roll conditions. Next allow for temporary departure from resulting period non-adiabaticity known fail. locality event energy conservation lead tight bound on size effects field. discuss implications power...
We study (p)reheating in alpha-attractor T-models of inflation, taking into account both scalar fields present these models: the inflaton and spectator. The two-field model has a negative field-space curvature which, at end may lead to geometrical destabilization spectator for small values alpha<~10^(-3). perform instability (Floquet) analysis linear dynamics fully non-linear lattice computations with our numerical code, which we specifically designed class models non-canonical kinetic...
Being part of a social structure offers chances for learning vital survival and reproduction. Nevertheless, studying the neural mechanisms under laboratory conditions remains challenging. To investigate impact socially transmitted information about rewards on individual behavior, we used Eco-HAB, an automated system monitoring voluntary behavior group-housed mice seminaturalistic conditions. In these settings, male spontaneously form networks, with individuals occupying diverse positions. We...
A bstract We examine a scenario in which the reheating temperature T R after inflation is so low that it comparable to, or lower than, freeze out of ordinary WIMPs. In this case relic abundance dark matter reduced, thus relaxing impact usually strong constraint coming from requirement universe does not overclose. first re-examine dynamics freezeout during reheating. Next we study parameter space MSSM with ten free parameters, Constrained and singlino-dominated regions Next-to-MSSM. each...
We calculate the scalar spectral index ns and tensor-to-scalar ratio r in a class of recently proposed two-field no-scale inflationary models supergravity. show that, order to obtain correct predictions, it is crucial take into account coupling between curvature isocurvature perturbations induced by noncanonical form kinetic terms. This enhances perturbation suppresses resulting per mille level even for values slow-roll parameter ∼ 0.01. Beyond these particular models, we emphasise that...
We analyze the most general version of supersymmetric minimal see-saw model with only two right-chiral neutrinos which are degenerate in masses at scale Grand Unification. study renormalization effects that give rise to non-zero CP asymmetries decays these and find their resonant enhancement due small mass splitting is partly compensated by other RG running neutrino Yukawa couplings. In spite this compensation, can be large enough for successful thermal leptogenesis. Moreover, they depend...
We argue that in models of inflation with two scalar fields and non-canonical kinetic terms there is a possibility obtaining red tilt the power spectrum curvature perturbations from noncanonicality-induced interactions between isocurvature perturbations. describe an extremely simple model realizing this idea, study numerically its predictions for discuss applications realistic scenarios inflation. to what extent scale inflationary potential can be decoupled amplitude density fluctuations.
We re-examine the importance of slow-roll corrections during evolution cosmological perturbations in models multi-field inflation. find that many instances presence light degrees freedom leads to situations which next leading order become significant. Examples where we expect such be crucial include modes exit Hubble radius while inflationary trajectory undergoes an abrupt turn field space, or a phase transition. illustrate this with two examples -- hybrid inflation and double quadratic...
We study the geometrical instability arising in multi-field models of inflation with negatively-curved field space. analyse how homogeneous background evolves presence destabilisation, and show that, simple models, a kinematical backreaction effect takes place that shuts off instability. also follow evolution unstable scalar fluctuations most situations, they must remain perturbative regime order to satisfy observational constraints. conclude simplest does not end prematurely, but rather...
Abstract We develop an extension of special relativity in <?CDATA $1+3$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mn>1</mml:mn> <mml:mo>+</mml:mo> <mml:mn>3</mml:mn> </mml:math> dimensional spacetime to account for superluminal inertial observers and show that such rules out the conventional dynamics mechanical point-like particles forces one use a field-theoretic framework. Therefore we field theory can be viewed as direct consequence extended relativity.
By means of Bayesian techniques, we study how a premature ending inflation, motivated by geometrical destabilization, affects the observational evidences typical inflationary models. Large-field models are worsened, and inflection point potentials drastically improved for specific range field-space curvature characterizing destabilization. For other observe shifts in preferred values model parameters. quartic hilltop instance, contrary to standard case, find preference theoretically natural...
We make a simple observation that if one of the right-chiral neutrinos is very heavy or its Yukawa couplings to standard lepton doublets are negligible, so it effectively decouples from see-saw mechanism, prediction for baryon asymmetry Universe resulting leptogenesis depends, apart masses $M_1$ and $M_2$ remaining two neutrinos, only on element $\YY{22}$ neutrino coupling. For $M_2\simgt10M_1$ lower bound also $T_{\rm reh}$, requirement 'successful leptogenesis' then significantly increased...
Supersymmetric theories with gravitino dark matter generally do not allow the high reheating temperature required by thermal leptogenesis without running afoul of relic abundance or big bang nucleosynthesis constraints. We report on a search for parameter space that satisfies these requirements neutralino as next-to-lightest superpartner. The main implication is near degeneracy gluino other neutralinos in spectrum. leading discovery channel at LHC this scenario through monojet plus missing...
Low scale inflation has many virtues and it been claimed that its natural realisation in the supersymmetric Standard Model can be achieved rather easily. In this Letter we demonstrate dynamics of hidden sector responsible for supersymmetry breaking structure soft terms affects significantly, fact often spoils, would-be inflationary dynamics. We also point out issue cosmological constant cancellation post-inflationary vacuum strongly inflation. It is important to note crucial difference...
Abstract Translational value of mouse models neuropsychiatric disorders depends heavily on the accuracy with which they replicate symptoms observed in human population. In autism spectrum disorder (ASD) these include, among others, social affiliation, and communication deficits as well impairments understanding perception others. Most studies addressing issues BTBR T+ Itpr3tf/J mouse, an idiopathic model ASD, were based short dyadic interactions often non‐familiar partners placed a novel...
We investigate O'Raifeartaigh-type models for F-term supersymmetry breaking in gauge mediation scenarios the presence of gravity. It is pointed out that vacuum structure those such metastable vacua gravity contribution to scalar masses always suppressed level below 1 percent, almost sufficient avoiding FCNC problem. Close limit, gravitino mass can be range 10–100 GeV, opening several interesting possibilities models, including Giudice-Masiero mechanism μ and Bμ generation. Gravity sector...
The aim of this paper is to discuss phenomenological consequences a particular unification model (Z_3 model) inspired by F-theory. most distinctive feature variety (cosmologically feasible) options for the NLSP and NNLSP, beyond usually considered benchmark scenarios.