A5060874303- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Quantum Chromodynamics and Particle Interactions
- Computational Physics and Python Applications
- Neutrino Physics Research
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Algebraic Geometry and Number Theory
- Nuclear physics research studies
- Geometry and complex manifolds
- Superconducting Materials and Applications
- Homotopy and Cohomology in Algebraic Topology
- Scientific Computing and Data Management
- Noncommutative and Quantum Gravity Theories
- Pulsars and Gravitational Waves Research
- Spaceflight effects on biology
- Service-Oriented Architecture and Web Services
- Particle Accelerators and Free-Electron Lasers
- Inorganic Fluorides and Related Compounds
- Adversarial Robustness in Machine Learning
- Astro and Planetary Science
Northeastern University
2012-2023
The NSF AI Institute for Artificial Intelligence and Fundamental Interactions
2021
University of California, Berkeley
2000-2019
Universidad del Noreste
2014-2015
The Abdus Salam International Centre for Theoretical Physics (ICTP)
2014-2015
Berkeley College
2008-2011
University of Massachusetts Boston
2010
University of Michigan
2002-2006
University of Pennsylvania
2004-2006
Center for Theoretical Biological Physics
2003
We utilize machine learning to study the string landscape. Deep data dives and conjecture generation are proposed as useful frameworks for utilizing in landscape, examples of each presented. A decision tree accurately predicts number weak Fano toric threefolds arising from reflexive polytopes, which determines a smooth F-theory compactification, linear regression generates previously proven gauge group rank an ensemble $$ \frac{4}{3}\times 2.96\times {10}^{755} compactifications. Logistic...
We propose deep reinforcement learning as a model-free method for exploring the landscape of string vacua. As concrete application, we utilize an artificial intelligence agent known asynchronous advantage actor-critic to explore type IIA compactifications with intersecting D6-branes. different background configurations are explored by changing D6-brane configurations, receives rewards and punishments related consistency conditions proximity Standard Model These in turn utilized update...
A bstract Dark Yang-Mills sectors, which are ubiquitous in the string landscape, may be reheated above their critical temperature and subsequently go through a confining first-order phase transition that produces stochastic gravitational waves early universe. Taking into account constraints from lattice (center Weyl) symmetries, we use phenomenological model to construct an effective potential of semi quark-gluon plasma phase, compute wave signal produced during confinement for numerous...
Kreuzer and Skarke famously produced the largest known database of Calabi-Yau threefolds by providing a complete construction all 473,800,776 reflexive polyhedra that exist in four dimensions [1]. These describe singular limits ambient toric varieties which can as hypersurfaces. In this paper, we review how to extract topological geometric information about using construction, provide, companion online (see http://nuweb1.neu.edu/cydatabase ), detailed inventory these quantities are interest...
Axionlike particle (ALP)--photon couplings are modeled in large ensembles of string vacua and random matrix theories. In all cases, the effective coupling increases polynomially number ALPs, which hundreds or thousands expected ensembles, many ultralight. The value ${g}_{a\ensuremath{\gamma}\ensuremath{\gamma}}\ensuremath{\simeq}{10}^{\ensuremath{-}12}\text{ }\text{ }{\mathrm{GeV}}^{\ensuremath{-}1}\ensuremath{-}{10}^{\ensuremath{-}10}\text{ }{\mathrm{GeV}}^{\ensuremath{-}1}$ provide viable...
We extend previous analyses on the interplay between nonuniversalities in gaugino mass sector and thermal relic densities of LSP neutralinos, particular to case moderate large tan beta. introduce a set parameters that generalizes standard unified scenario cover complete allowed parameter space sector. discuss physical significance cosmologically preferred degree degeneracy charginos study effect this has prospects for direct detection neutralinos next round dark matter experiments. Lastly,...
Extensions of the minimal supersymmetric standard model often predict existence new fermions and their scalar superpartners which are vectorlike with respect to gauge group but may be chiral under additional factors. In this paper we explore production decay an important example, i.e., a heavy isosinglet charge $\ensuremath{-}1/3$ quark its partner, using assignments $\mathbf{27}$-plet ${E}_{6}$ for illustration. We emphasize that, depending on symmetries low-energy theory, such exotic...
We study cosmological constraints on dark pure Yang-Mills sectors. Dark glueballs are overproduced for large regions of ultraviolet parameter space. The problem may be alleviated in two ways: via a preferential reheating into the visible sector, motivating certain inflation or modulus decay models, decays axions moduli, which strongly constrained by nucleosynthesis and $\mathrm{\ensuremath{\Delta}}{N}_{\mathrm{eff}}$ bounds. String models frequently have multiple hidden sectors, subject to...
We perform a comprehensive study of models dark matter (DM) in Universe with non-thermal cosmological history, i.e phase pressure-less domination before the onset big-bang nucleosynethesis (BBN). Such histories are generically predicted by UV completions that contain gravitationally coupled scalar fields (moduli). classify different production mechanisms for DM this framework, generalizing previous works considering wide range masses/couplings and allowing to be equilibrium "dark" sector....
We argue, based on typical properties of known solutions string or M theory, that the lightest supersymmetric particle visible sector is likely to be unstable. In other words, dark matter probably not a with standard model quantum numbers, such as weakly interacting massive particle. The argument simple and occurrence (a) hidden sectors, (b) interactions between (visible) these (c) lack an against neutral particles being lighter than These conclusions do rely arguments R-parity violation.
We investigate the dark matter prospects of supersymmetric models with nonuniversal gaugino masses at low values $\mathrm{tan}\ensuremath{\beta}.$ find that for particular ratio soft supersymmetry-breaking masses, ${M}_{2}{/M}_{1},$ an enhanced coannihilation efficiency between lightest chargino and neutralino occurs. As a specific example, we hidden sector condensation. These exhibit high scalar requisite freedom in masses. The cosmologically viable regions parameter space are investigated,...
We introduce network science as a framework for studying the string landscape. Two large networks of geometries are constructed, where nodes extra-dimensional six-manifolds and edges represent topological transitions between them. show that standard bubble cosmology model on has late-time behavior determined by largest eigenvector $-(\mathbf{L} + \mathbf{D})$, $\mathbf{L}$ $\mathbf{D}$ Laplacian degree matrices networks, which provides dynamical mechanism vacuum selection in
A bstract We establish an orientifold Calabi-Yau threefold database for h 1 , ( X ) ≤ 6 by considering non-trivial ℤ 2 divisor exchange involutions, using a toric www.rossealtman.com/tcy ). first determine the topology each individual (Hodge diamond), then identify and classify proper involutions which are globally consistent across all disjoint phases of Kähler cone unique geometry. Each will result in manifold. Then we clarify possible fixed loci under involution, thereby determining...
The PAMELA positron excess is analyzed within the framework of nonuniversal supergravity (SUGRA) models with an extended $U(1{)}^{n}$ gauge symmetry in hidden sector leading to neutralino dark matter either a mixed Higgsino-wino lightest $R$-parity odd supersymmetric particle (LSP) or essentially pure wino-dominated LSP. LSP can produce observed and satisfy relic density constraints class due near degeneracy mass spectrum mass. simultaneous satisfaction WMAP data accomplished through...
We examine arguments that could avoid light superpartners as an implication of supersymmetric radiative electroweak symmetry breaking. argue that, from the point view string theory and standard approaches to generating mu-term, cancellations among parameters are not a generic feature. While coefficients relating Z-mass in soft supersymmetry breaking Lagrangian can be made smaller, these same mechanisms lead lighter superpartner masses at scale. Consequently we strengthen gluinos,...
String theories in principle address the origin and values of quark lepton masses. Perhaps small neutrino masses could be explained generically string theory even if it is more difficult to calculate individual values, or perhaps some constructions favored by generating We examine this issue context well-known three-family standard-like ${Z}_{3}$ heterotic orbifolds, where well enough known construct corresponding operators allowed selection rules, analyze D- F-flatness conditions....
Motivated by specific connections to dark matter signatures, we study the prospects of observing presence a relatively light gluino whose mass is in range ~(500-900) GeV with wino-like lightest supersymmetric particle ~(170-210) GeV. The gaugino spectra studied here generally different from other models, and particular those wino dominated LSP, that gluinos can be significantly lighter. positron excess reported PAMELA satellite data accounted for annihilations LSP their relic abundance...
Additional Z′ gauge bosons are predicted by a wide variety of extensions the standard model (SM). Possibilities include TeV‐scale with electroweak coupling, very light which nearly decouple from particles, and communicate quasi‐hidden sector. A broad survey is given theoretical possibilities physics implications for particle cosmology. Several novel examples, including Z′s suggested PAMELA, Stueckelberg Z′s, associated mediation supersymmetry breaking, described.
We present a focused study of predictive unified model whose measurable consequences are immediately relevant to early discovery prospects supersymmetry at the LHC. ATLAS and CMS have released their analysis with 35~pb$^{-1}$ data class we discuss is consistent this data. It shown that an increase in luminosity LSP dark matter mass gluino can be inferred from simple observables such as kinematic edges leptonic channels peak values effective distributions. Specifically, consider cases which...
We carry out an analysis of the potential Large Hadron Collider (LHC) to discover supersymmetry in runs at $\sqrt s=7$ TeV with accumulated luminosity (0.1--2) fb$^{-1}$ data. The is done both minimal supergravity (mSUGRA) and (SUGRA) models non-universal soft breaking. Benchmarks for early discovery data are given. provide update b-tagging efficiencies PGS 4 appropriate LHC analyses. A large number signature channels analyzed it shown that each exhibited discoverable 5$\sigma$ level or more...
I review the theoretical and experimental status of proton decay theory experiment. Regarding theory, focus mostly but not only on grand unification. discuss minimal, well established SU(5) SO(10) models, both ordinary supersymmetric. show how minimal realistic extensions original Georgi ‐ Glashow model can lead to interesting LHC physics, demonstrate that supersymmetric is in perfect accord with Since no universally accepted has yet emerged, effective operator analysis some related...