A5036692786- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Neutrino Physics Research
- Noncommutative and Quantum Gravity Theories
- Atomic and Subatomic Physics Research
- Galaxies: Formation, Evolution, Phenomena
- Distributed and Parallel Computing Systems
- Relativity and Gravitational Theory
- Scientific Computing and Data Management
- Astronomy and Astrophysical Research
- International Science and Diplomacy
- Biofield Effects and Biophysics
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Muon and positron interactions and applications
- Ideological and Political Education
- Earth Systems and Cosmic Evolution
- Numerical methods for differential equations
- Random lasers and scattering media
Harvard University
2015-2024
Harvard University Press
2012-2024
MIT Lincoln Laboratory
2019
Perimeter Institute
2018
Thomas Jefferson National Accelerator Facility
2014-2016
Princeton University
2009-2011
Cornell University
2005-2007
University of Louisville
1999
Recently, the ATLAS and CMS collaborations have announced exciting hints for a Standard Model-like Higgs boson at mass of approximately 125 GeV. In this paper, we explore potential consequences MSSM low scale SUSY-breaking. As is well-known, GeV implies either extremely heavy stops (>~ 10 TeV), or near-maximal stop mixing. We review quantify these statements, investigate implications models low-scale SUSY breaking such as gauge mediation where A-terms are small messenger scale. For models,...
We present a new mechanism for producing the correct relic abundance of dark photon matter over wide range its mass, extending down to $10^{-20}\,\mathrm{eV}$. The is initially stored in an axion which misaligned from minimum. When starts oscillating, it efficiently transfers energy into photons via tachyonic instability. If mass within few orders magnitude $m_{\gamma'}/m_a = {\cal O}(10^{-3} - 1)$, then make up dominant form today. numerical lattice simulation benchmark model that...
We investigate the behavior of Weak Gravity Conjecture (WGC) under toroidal compactification and RG flows, finding evidence that WGC bounds for single photons become weaker in infrared. By contrast, we find a photon satisfying will not necessarily satisfy it after when black holes charged Kaluza-Klein are considered. Doing so either requires an infinite number states different charges to original theory or restriction on allowed radii. These subtleties suggest if is true, must seek stronger...
We examine the theoretical motivations for long-lived particle (LLP) signals at LHC in a comprehensive survey of Standard Model (SM) extensions. LLPs are common prediction wide range theories that address unsolved fundamental mysteries such as naturalness, dark matter, baryogenesis and neutrino masses, represent natural generic possibility physics beyond SM (BSM). In most cases LLP lifetime can be treated free parameter from $\mu$m scale up to Big Bang Nucleosynthesis limit $\sim 10^7$m....
A bstract It is widely believed that consistent theories of quantum gravity satisfy two basic kinematic constraints: they are free from any global symmetry, and contain a complete spectrum gauge charges. For compact, abelian groups, completeness follows the absence 1-form symmetry. However, this correspondence breaks down for more general where breaking symmetry insufficient to guarantee spectrum. We show may be restored by broadening our notion include non-invertible topological operators,...
The weak gravity conjecture, at the simplest level stating that ``gravity is weakest force,'' has motivated many recent works aiming to understand quantum and put constraints on field theories can be coupled gravity, including one describing real world. This review surveys motivation, historical development, advances related this conjecture.
These notes are an expanded version of lectures given at the 2022 TASI summer school in Boulder, Colorado. One goal these lecture is to (partially) bridge gap between what one learns typical introductory quantum field theory classes and needs understand follow modern developments particle beyond Standard Model. Topics covered include global gauge symmetries, charge quantization, instantons, chiral anomalies, Strong CP problem, axion models from 4d higher dimensions, expected absence...
Dark matter direct detection searches for signals coming from dark scattering against nuclei at a very low recoil energy scale ~ 10 keV. In this paper, simple non-relativistic effective theory is constructed to describe interactions between and without referring any underlying high models. It contains the minimal set of operators that will be tested by detection. The approach highlights distinguishable spectra could arise different theoretical If discovered in near future experiments,...
Based on observational constraints large scale structure and halo structure, dark matter is generally taken to be cold essentially collisionless. On the other hand, given number of particles forces in visible world, a more complex sector could reasonable or even likely possibility. This hypothesis leads testable consequences, perhaps portending discovery rich hidden world neighboring our own. We consider scenario that readily satisfies current bounds we call Partially Interacting Dark Matter...
We point out that current constraints on dark matter imply only the majority of is cold and collisionless. A subdominant fraction could have much stronger interactions. In particular, it interact in a manner dissipates energy, thereby cooling into rotationally-supported disk, as baryons do. call this proposed new component Double-Disk Dark Matter (DDDM). argue DDDM constitute all roughly large baryons, be detected through its gravitational effects motion stars galaxies, for example....
The Ooguri-Vafa Swampland Conjectures claim that in any consistent theory of quantum gravity, when venturing to large distances scalar field space, a tower particles will become light at rate is exponential the space distance. We provide novel viewpoint on this claim: if we assume states becomes near particular point and further demand loop corrections drive both gravity strong coupling common energy scale, then requirement exponentially fast field-space distance Planck units follows...
We study ultraviolet cutoffs associated with the Weak Gravity Conjecture (WGC) and Sublattice (sLWGC). There is a magnetic WGC cutoff at energy scale $$e G_N^{-1/2}$$ an sLWGC tower of charged particles. A more fundamental which gravity becomes strong field theory breaks down entirely. By clarifying nature for nonabelian gauge groups we derive parametric upper bound on this arbitrary theories. Intriguingly, show that in theories approximately saturating sLWGC, scales loop corrections from...
The Weak Gravity Conjecture postulates the existence of superextremal charged particles, i.e. those with mass smaller than or equal to their charge in Planck units. We present further evidence for our recent observation that known examples a much stronger statement is true: an infinite tower particles different charges exists. show effective Kaluza-Klein field theories and perturbative string vacua respect Sublattice Conjecture, namely finite index sublattice full lattice exists particle at...
Models of large-field inflation based on axion-like fields with shift symmetries can be simple and natural, make a promising prediction detectable primordial gravitational waves. The Weak Gravity Conjecture is known to constrain the simplest case in which single compact axion descends from gauge field an extra dimension. We argue that also constrains variety theories multiple axions including N-flation some alignment models. show other models entail surprising consequences for how mass...
This report summarises the physics opportunities in search and study of beyond Standard Model at a 100 TeV pp collider.
The QCD axion's coupling to photons is often assumed lie in a narrow band as function of the axion mass. We demonstrate that several simple mechanisms, addition photophilic clockwork already literature, can significantly extend allowed range couplings. Some mechanisms we present generalize KNP alignment scenario, widely studied model inflation, phenomenology axion. In particular KSVZ-like realizations two-axion and mechanism. Such "confinement tower" realization may prove useful variety...
In effective quantum field theory, a spin-1 vector boson can have technically natural small mass that does not originate from the Higgs mechanism. For such theories, which may be written in St\"uckelberg form, there is no point space at exactly zero. I argue gravity differs from, and constrains, theory: arbitrarily masses are forbidden. particular, limit goes to zero lies infinite distance space, this correlated with tower of modes becoming light according Swampland Distance Conjecture....
We consider the immediate or near-term experimental opportunities offered by some scenarios that could explain new diphoton excess at LHC. If is due to a particle X s 750 GeV, additional particles are required, providing further signals. connected with naturalness, may be produced in top partner decays. Then $$ t^{\prime}\overline{t}^{\prime } signal, t ′ → tX and gg dominantly, might discovered reinterpreting 13 TeV SUSY searches multijet events low MET and/or lepton. bound state of quirks,...