Talk Abstracts 2013
Explosions in the Cosmos and Exotic Atomic Nuclei
How are the elements formed? This is one of the top outstanding questions in astronomy and physics. While the lightest elements, hydrogen, helium, and maybe lithium, were formed in the big bang, all of the heavier elements were formed in stars. We understand many of the stellar processes in stars that give rise to elements up to iron. But we do not know how the heaviest elements are formed. Are they formed in the explosions of supernovae or in the collisions of neutron stars? What are the nuclear processes that synthesize new elements? This talk will start with my lifelong passion for astronomy and continue to the current efforts in nuclear physics that are providing key ingredients to solving outstanding questions on the origin of the elements.
String Theory, Particle Physics and Black Holes
In past decades, string theory has emerged as the prime candidate for a quantum unification of electromagnetic, nuclear and gravitational forces. Geometrical aspects of string theory, and in particular the existence of extra dimensions, shed light on important fundamental questions, including the microscopic structure of black holes and the geometric origin of particle physics. We review certain aspects of these developments such as introduction of extended objects - Dirichlet branes - and highlight an important geometric role that these objects play in deriving particle physics from string theory. We also review the role these object play in elucidating the microscopic structure of black holes.
Imaging cellular interactions in disease: nonlinear optics for in vivo studies
My interest is in studying the contribution of multiple physiological systems to disease initiation and progression, with applications in neurodegenerative disease, cardiovascular disease, and cancer. We hope to study how the vascular, immune, inflammatory systems and cells native to a tissue interact in these diseases. A major challenge in such work is that model systems such as cell culture or even organotypic tissue culture cannot fully recapitulate all the different cell types involved in disease, so in vivo studies are required. However, it is experimentally difficult to study and manipulate cell-level dynamics in live animals. Recently, we have worked to develop tools that work in whole animals and have sufficient spatial and temporal resolution to quantify cellular dynamics. We also now have tools to produce targeted disruption with cellular-scale precision. We used these tools to piece together a picture of how occlusion or hemorrhage of small blood vessels in the brain affects the health and function of nearby neurons, and thus contributes to cognitive decline. Experience with the physics of nonlinear optics and quantitative analysis tools have been critical to our progress. We are now using such capabilities to unravel the interaction of various physiological systems in diseases, with a focus on Alzheimer’s disease, cancer metastasis, and cardiac blood flow.
The First Two Years at the Large Hadron Collider
The Large Hadron Collider (LHC) has been colliding protons for more than two year now, and a large data sample that exceeds all expectations has been collected. This first data set has been anticipated eagerly, since it gives us the sensitivity to investigate many interesting phenomena, such as the heavy Higgs Bosons, and certain supersymmetric scenarios, to name a few. I will briefly review the highlights of the first two years, and focus in particular on a search for production of supersymmetric particles, as an example of the analytical methods that are used and the conclusions we can draw now.
Marissa Adams (University of Rochester) - Women Into the Natural Sciences (WINS).
A new outreach program in association with Society of Women Engineers (SWE) and Women in Science and Engineering (WISE) at the University of Rochester aimed at "winning over" future scientists. WINS facilitates an experience for all age levels, from children in elementary school to graduate students. This is such that outreach spreads to those outside of the science community, as well as to those within it. Emphasis on the University of Rochester Pre-College Experience in Physics summer program for 9th and 10th grade high school women (PREP) is made and a new model for outreach programs is proposed.
Laurel Anderson (Dartmouth College) - Noise effects on spin chain dynamics.
The fluorine spins in a fluorapatite crystal form a quasi-one-dimensional spin system, or spin chain, that can be used to study many-body quantum dynamics. Such spin chains are of interest from a quantum information perspective as potential “quantum wires” that can be used to coherently transfer information from one end of the chain to the other. We use a combination of numerical simulations and nuclear magnetic resonance experiments on the fluorine spin chains in a single crystal of fluorapatite to study how the transfer of spin polarization (or local magnetization) is affected by the presence of collective noise. Our results indicate that the addition of noise results in a loss of coherence and the eventual localization of the magnetization.
Katherine Casey (Cornell University) - Understanding How the Difference-Map Algorithm Works through Graphical Examples.
The Difference-Map algorithm is a powerful tool for finding solutions to problems with two constraints. Such problems often come up in experimental research, when one has to reconstruct the object of interest from indirect measurements. Several graphical exam- ples will be used to elucidate how the algorithm works.
Xinru Cheng (Colgate University) - Spatial-mode Encoding of Photons using Spatial Light Modulators.
The goal of this project is to encode spatial modes onto entangled photons using spatial light modulators (SLMs). Compared to entanglement in polarization, entanglement of photons in spatial modes is advantageous because it allows for superposition of an infinite number of states, while polarization is limited to superposition of two states. We use two spatial light modulators to generate and detect superpositions of spatial modes. The SLMs display phase-shifted images of selected spatial modes, generated via a computer program. This method enables us to generate superposition of different spatial modes and encode them onto classical light, creating many more photon states than achievable via polarization. This work is part of an ongoing effort at Colgate University to prepare photon pairs entangled in both polarization and spatial modes.
Alexandra Day (Wellesley College) - Rejuvenation of a Cesium-Based Dispenser Photo-cathode in Response to Atmospheric Contamination.
Photocathodes produce high-energy electron beams that are well suited for use in free electron lasers (FELs). This project describes work to study and improve the quantum efficiency of cesium-based photocathodes for use in ship-based missile defense FELs. Particular emphasis is placed on quantifying the ability of a hybrid dispenser photocathode to recover from intentional atmospheric contamination. External and internal cesium deposition methods were studied throughout the project, as were the effects of different temperatures and pressures. Together the results of this project clarify the tolerance of certain photocathodes to intentional contamination and describe the related effects on quantum efficiency.
Margaret Dievendorf (Colgate University) - Optimization of Calcium Extraction for Meteorite Analysis.
An important part in the analyses of meteorites is determining the terrestrial age, which tells us how long the meteorite has been on earth. To find the terrestrial age, the extraction of radioactive isotopes, created by cosmic rays, needs to occur. This requires extensive separation and purifying of the isotope from all other ninety-two elements in a meteorite. In this process, low yield and purity can present challenges against finding an accurate age. My goal this semester is to work on obtaining high yield and purity for the element of calcium, which has its radioactive isotope of 41C. I also am finding where the sources of loss are in the steps of the experiment and trying to minimize such losses. By optimizing the extraction of isotopes, the procedure can be made better and higher yields and purity can be obtained to give a more accurate age.
Barbara Fisher (Richard Stockton College of NJ) -The Speed of Light: Different Ways to Discover Constant.
The speed of light is a constant that does not change with regard to a reference frame. It is the value that relates one event to another. This talk will present introductory concepts of relativity and three different ways to measure the speed of light. It will focus on using an Arduino Uno for this purpose.
Kelsey Hallinen (Carnegie Mellon University) - Volumetric Stability of Lipid Bilayers.
In agreement with recent reports, a commercial densimeter has yielded a gradual decrease in lipid molecular volume of DPPC multilamellar vesicle dispersions in the gel phase upon repeated thermal cycling between 10 °C and 50 °C. The considerable size of this decrease would have significant implications for the physical chemistry of biomembranes. In contrast, neutral buoyancy measurements performed with similar thermal cycling indicate no gradual change in lipid volume in the gel phase at 20 °C. Remixing the lipid in the densimeter shows that the apparent volume decrease is an artifact. We conclude that gel phase DPPC bilayers exist in a volumetrically stable phase.
Sarah Kim (Cornell University) - Measuring Partitioning of Lissamine Rhodamine DOPE in the Four Component Model Membrane System DSPC/DOPC/POPC/Chol.
Nanodomain organization in the cellular plasma membrane is implicated in membrane protein localization. The four-component model membrane system DSPC/DOPC/POPC/ Chol exhibits a transition in the size of coexisting liquid domains from macroscopic to nanoscopic as the ratio of low-melting lipids DOPC and POPC is varied. This system permits exploring partitioning of macromolecules between coexisting liquid-disordered and liquid-ordered domains. We developed a fluorescence spectroscopy method for quantitatively measuring partitioning using the fluorescent lipid analogue lissamine rhodamine DOPE (LR -DOPE). We measure fluorescence of paucilamellar vesicles (PLVs) with 1/5000 LR-DOPE along a tieline and fit to the lever rule to extract the partition coefficient. We found that comparable LR-DOPE partitioning into domains of increasing size indicates that macroscopic and nanoscopic domains have similar phase properties.
Alison Kinross (McMaster University) - Does Inline Coherent Imaging provide the key to laser welding dynamics?
Inline Coherent Imaging (ICI) is a technique that relies on the principle of interferometry in order to acquire depth-of-weld measurements for laser keyhole welding at imaging rates >300 kHz. We present ex situ destructive analysis that confirms the accuracy of ICI in the axial direction: a result that could eventually lead to the elimination of destructive analysis as the industrial standard for quality control. Furthermore, we present ICI data corresponding to the successful welding of various materials including galvanized steel and stainless steel in the overlap configuration.
Alexandra Kuznetsov (University of Rochester) - Paleomagnetic Analysis of NWA 5480: Investigating Paleofields on Vesta.
Vesta, the second largest body in the asteroid belt, is now thought to be a protoplanet. It is 525 km in diameter and its structure is differentiated. These and other characteristics place 4 Vesta as a candidate for having once had a magnetic dynamo. Meteorites from the HED class are thought to come from Vesta. Samples from the diogenite NWA-5480 were analyzed to ascertain the magnetic properties of its proposed parent body. Hysteresis analysis and thermal demagnetization were used to characterize the nature of the magnetic inclusions within several single crystal olivine and groundmass samples. Total TRM experiments were conducted to analyze the behavior of the magnetic carriers in a known applied magnetic field. The magnetic data collected will help researchers better understand the thermal and chemical evolution of the parent body.
Maya Lewin-Berlin (Smith College) - Laser Cooling and UltraCold Molecules.
Ultracold molecules are exciting because they have the potential to be used as qubits in a scalable quantum computer. At an REU at UCLA, I worked on a new technique to bring molecules down to temperatures below a hundredth of a Kelvin. In this method, laser-cooled neutral atoms are trapped with molecular ions. As the cold atoms collide with the hot molecules, the molecules lose kinetic energy and cool down.
Lisa Mariani (Saint Joseph’s University) - Stick-Slip Dynamics of Friction Using Velcro as a Model System.
Stick-slip motion occurs when objects do not slide smoothly and is not well described by the classical Amontons-Coulomb laws of friction. Velcro is a material that exhibits all of the hallmarks of stick-slip motion when in shear. As a mesoscopic hook and loop system, the frictional dynamics of Velcro model the dynamics that occur at the real contact interfaces in materials during the stick-slip regime. Using Velcro as model system, the fundamental properties of friction are investigated. In accordance with Coulomb’s law, there is an independence of the frictional force with respect to driving velocity. In stark contrast to Amontons’ laws, there is a liner dependence of the static friction force Fsmax and the kinetic friction Fk upon contact area (hook number). In addition, there is a power law dependence of Fsmax and Fk upon the applied load, or normal force of the system. This data evinces that the coefficient of friction is not a constant of the system. The data also suggests that there is a certain critical load beyond which the coefficient of friction becomes a constant. Another interesting characteristic of the system is that the ratio of Fsmax to Fk is a constant of 2.
Kristin Marino (Pennsylvania State University) - Magnetic-Field Dependence of the Spinon Velocity in the S=1/2 Linear-Chain Heisenberg Antiferromagnet Copper Pyrazine Dinitrate.
We have measured the specific heat of fully deuterated copper pyrazine dinitrate (CuPzN), a spin-1/2 antiferromagnetic chain compound, at temperatures down to 0.12 K in magnetic fields up to 14 T. This was done to reduce nuclear heat contributions by using deuterated CuPzN and to better define the magnetic heat capacity by taking measurements beyond the saturation field. The results are in good agreement with previous data taken by Hammar et al. in fields up to 9 T. The spinon velocity obtained from the specific heat is compared to theoretical predictions as a function of magnetic field.
Sara Mc Carthy (McGill University) - Theoretical Analysis of Variable Action in Random Walks.
Stochastic processes are integral to the framework of machine learning; analysis of such processes allows for optimization of the policy the learning agent follows, and consequently it's performance. Runtime and probability of termination are studied with different action policies on cartesian and other discrete manifolds. The effects of additional ac- tions to the policy are also characterized. A breakdown of generalized actions is done along with an analysis of teleportation actions to give insight into the randomization of movement. Runtime is found to be invariant under a mapping from the one dimensional markov chain to the ring. Normalized teleport actions were found to have approximately O(1/n) savings compared to basis actions.
Brenda McLellan (Polytechnic Institute of NYU) - Self Force in Classical Gauge Theories: The Case of Electrodynamics.
Electromagnetic waves provide a ubiquitous presence through modern physics and our everyday lives, however when describing their emission from an accelerated charge, logical inconsistencies arise in using our current frameworks to describe the particle dynamics. Obstinate questions arise when attempting to understand the contribution of a field to the inertial mass of the particle and the force it experienced during the process of radiation. Mathematical paradoxes emerge in attempting to treat the field singularities at the position of the charge and quantitative results may only be found in simplified space-time distributions. The inherent limitation to our description challenges the internal logic to the way we determine charged particle dynamics. While classical and quantum mechanics provide a framework for calculating the radiation reaction force, they do not provide conceptual or logical clarification to the understanding of the radiation phenomena, or the nature of the charged particle. This concern carries over into most modern field theories as the same issues arise in any particle-field description of action at a distance. Here, we review a number of approaches posed to resolve these inconsistencies. These include proposals to eliminate the concept of the field, to describe charges as extended objects, and to treat particles as singularities of fields. Our ultimate goal is to fundamentally re-examine the notion of charged particles, their affiliated field, and the coupling between them.
Shannon Perri (Rowan University) - Investigation of Neutron Emission and Elemental Abundance through PCA.
We are investigating the correlation between neutron emission and the identification of surface elemental abundances on Mars using data collected by the Mars Odyssey High Energy Neutron Detector (HEND) and the Gamma Ray Spectrometer (GRS), respectively. The purpose of this research will be to see if it is possible to do elemental abundance mapping on the lunar surface using the Lunar Reconnaissance Orbiter (LRO) Lunar Exploration Neutron Detector (LEND) since LRO lacked its own gamma ray spectrometer. We analyze these data through a process called Principle Component Analysis (PCA). PCA allows us to simplify the dimensionality of this data to look for connections that would otherwise be hidden and that may reveal whether there is a relationship between the GRS and HEND data. PCA was performed on the data in a variety of ways to see which version(s) give the best correlations. We will present our PCA results and discuss the comparisons of the various test versions.
Terri Poxon-Pearson (American University) - Exploring the Neutron Channel of Carbon Burning at Stellar Energies.
The 12C(12C,n)23Mg fusion reaction could be an important neutron donor to the weak s-process which is the stellar process responsible for forming most of the elements between iron and strontium. Carbon burning in this scenario occurs at low energies, around 3 MeV center-of-mass, where the nuclear reaction cross section is both small and difficult to predict. Recently, an experiment was conducted at University of Notre Dame’s Nuclear Science Laboratory using direct neutron detection in order to determine the cross section at the lowest energy ever measured. This June, we used an independent experimental method which involved the detection of beta+ particles from 23Mg decay in order to validate the results from the previous experiment. Results from this experiment show overall agreement, but indicated that a newly discovered resonance at 3.4 MeV may not have been as strong as originally thought. Along with these results, I will discuss possibilities and limitations for future investigations of 12C(12C,n)23Mg at astrophysically relevant energies.
Neesha Schnepf (Cornell University) - Tidal and tsunami signals in ocean bottom mag- netic measurements of the Northwestern Pacific: Observations versus predictions.
Motional induction in the ocean by tides has long been observed by both land and satellite measurements of magnetic fields. Previous studies have reported major discrepancies between observations and numerical predictions of the tidal magnetic signals. This study aims to characterize the magnetic signature of tidal currents from six different ocean bottom electromagnetic stations over the North Pacific and to compare these observations with numerical predictions. We expect the deep ocean measurements provide a low-noise and high-signal environment to detect the weak tidal magnetic signals. The ocean bottom magnetometers were located in the Northwestern Pacific Ocean and provided vector magnetic data. The stations span the time periods from August 2001 to August 2002 and from October 2005 to November 2008. For the tidal signal analysis, the long-term trend in the data was removed by subtracting a spline fit to the data. The spectral content of the magnetic data was obtained using two different methods: Welch’s periodogram method and Thompson’s multitaper method. For each station, the magnetic spectral amplitude increases with an increase in periods. There are clearly defined peaks near the major tidal modes, with the largest peaks occurring at S1, K1, and P1. The S2, M2, and N2 modes also all share a large peak in the spectrum. The results from the periodogram and multitaper analysis are consistent. The large peaks in both of the spectra show that the tidal modes are detectable and significant in the ocean-bottom magnetometer data. In order to separate the daytime ionospheric signals from the data, the analysis was limited to the nighttime (18-06 local time). To estimate the tidal amplitudes from the time series with gaps, the tidal harmonics were directly fit to the data in a least-square sense. In order to minimize the effect of outliers in the data, a robust fitting method was employed. Using the TPX07.2 tidal model and a 3D electromagnetic induction code, we predicted the tidal magnetic signal on a 0.25 x 0.25 degree global grid. The largest differences between the estimated tidal amplitudes and the predicted fields appear to occur in areas where the predicted field undergoes a steep change in amplitude, suggesting the model resolution in these areas may be the cause for the discrepancies. For the tsunami signal analysis, the long-term trend in the data was removed by either a Fourier series fit or a Gaussian fit. The vertical field component of the 2007 Kuril Islands tsunami was analyzed and compared to the results of Toh, et al. (2011). More analyses of other tsunamis are needed to see if this is a viable technique for tsunami warning systems.
Robyn Smith (Drexel University) - ALMA and Jansky VLA Observations of Highly Luminous Obscured Quasars: Evidence for Young Radio Jets.
We present ALMA 870 micron and JVLA K and X band B-array data for five extremely luminous obscured quasars selected from WISE to be bright and very red from 3.4 to 25 microns with an NVSS/FIRST compact detection indicating moderately powerful radio jets. These quasars are probably in a young phase where the SMBH has reached peak accretion and radio jet feedback may be in action. We are particularly interested in the role of radio jets in quenching star formation. The 22/870 micron colors indicate strong dominance of the quasar relative to any starburst that may be present. At the highest resolution available at 25 GHz, the JVLA sources are unresolved, providing limits on the source sizes of <2.6 kpc. Combined with catalog data, we derive radio spectral energy distributions from 1.4 to 345 GHz. We find three sources that have steep spectra consistent with Compact Steep Spectrum (CSS) sources, which are relatively young radio sources with a typical age of ~106 years. A fourth source displays a turnover around 5-10 GHz and can be classified as a Gigahertz Peaked Source (GPS), which are thought to be small young sources where the peak is caused by synchrotron self-absorption. GPS sources are typically younger and smaller than CSS sources. Young sources are consistent with what we were looking for in this sample.
Danielle Sofferman (Adelphi University) - Fabrication and properties of FIB-synthesized Ga nanodroplets arrays.
On GaAs surfaces, both annealing- and ion irradiation-induced Ga droplet motion have been observed. In this study, we have recorded Ga NP (nanoparticles) motion on GaAs surfaces, and quantified relative displacements of the motion in order to study the routes and net distance that the particles takes under a variety of incident beam directions, such as normal and off-normal ion irradiation. The different methods show that anisotropic Ga supply leads to the Ga NP moving opposite to scan direction (normal ion irradiation) and traveling a longer net distance (off-normal irradiation). In addition, quantifying the ion-induced Ga particle trajectories enables us to control the placement and arrangement of the NPs that can enhance surface plasmon resonance energy of Ga NPs which lead to SPR-enhanced photoluminescence of GaAs.
Danielle Solomon (Colgate Univsersity) - Measurement of Halyomorpha halys (brown marmorated stink bug) biogenic volatile organic compounds and their role in secondary aerosols.
The formation of aerosols is a key component in understanding cloud formation in the context of radiative forcing and global climate modeling. Biogenic volatile organic compounds (BVOCs) are a highly significant source of aerosols, yet there is still much to be learned about their structures, sources, and interactions. The aims of this project were to identify the BVOCs found in the defense pheromones of the brown marmorated stink bug and quantify them using Gas Chromatography Mass Spectrometry and to test whether oxidation of these compounds promoted aerosol and cloud seed formation. The bugs were tested under two conditions: agitation by asphyxiation and direct glandular exposure. Using an Agilent Model 7890A GC-MS, both yielded Tridecane, 2(5H)-Furanone 5-ethyl, and E-2- Decenal as the three most prominent compounds. H. halys were also tested in the agitated condition in a smog chamber, Scanning Mobility Particle Sizer (Differential Mobility Analyzer and Condensation Particle Counter), and Cloud Condensation Nuclei Counter. It was found that in the presence of 100-150 ppm ozone, secondary aerosols do form; however, total aerosol concentration per bug was not high enough to achieve cloud seed activation.
Corinne Vassallo (Carnegie Mellon University) - Terrain –Relative Planetary Orbit Determination.
Autonomous navigation is pivotal for increased landing accuracy and reduced cost of planetary missions. Performing optical navigation during orbit reduces the need for radio naviga- tion and communication with Earth, therefore increasing autonomy. A technique is presented for determining two-body orbits only using cameras. During orbit, spacecraft latitude and longitude are determined by matching surface features to pre-existing maps. Using knowledge of orbital dynamics, the time history of sensed latitudes and longitudes is fit to a physically realizable trajectory. Outlier measurements are rejected using Random Sample Consensus (RANSAC). Simulation results using data from the Lunar Reconnaissance Orbiter show that the method determines the orbit semi-major axis with an average error less than 6km for a 500km altitude lunar orbit. In addition to reducing reliance on Earth for lunar missions, this technique can also be used for autonomous capture and descent at planetary bodies in the outer solar system and beyond, where latency in radio communication becomes too great to consider it a viable option for real-time navigation during time-critical landing operations.
Liang Yu (Yale University) - The Evolution of Sunyaev-Zeldovich Effect Scaling Relations of Galaxy Clusters.
The Sunyaev-Zeldovich (SZ) effect is a promising observational tool to study cosmology and astrophysics. It is a distortion in cosmic microwave background (CMB) caused by scattering of CMB photons by hot electrons in galaxy clusters -- the largest gravitationally bound objects in the universe, whose formation is driven by the mysterious dark energy and dark matter. However, using the SZ effect as a robust and precise cosmological probe requires a detailed understanding of the relationship between the SZ observable and cluster mass. In this work, we investigate the impact of cluster mergers on the SZ observable-mass relation using high-resolution cosmological simulations of 16 galaxy clusters. By following the time evolution of the SZ signal of simulated clusters, we show that thermal SZ signal increases systematically by ~20% after a major merger, as kinetic energy of random gas motions decays into thermal energy. We find that this evolving thermal energy content contributes to scatter in the SZ observable-mass relation. Once we account for the non-thermal pressure provided by random gas motions, the total SZ signal exhibits no systematic evolution and its scatter is reduced by 6-9%. We discuss implications of our work in cluster cosmology with ongoing and future SZ surveys.
Zhuyun Xiao (Bryn Mawr College) - XMCD Study of La(1-x)SrxMnO3 Thin Films.
The perovskite manganite La(1-x)SrxMnO3 (LSMO) has attracted great attention recently due to its fundamental physics and potential applications in spintronics and data storage. In this work, we report temperature-dependent x-ray magnetic circular dichroism (XMCD) study of epitaxial LSMO thin films deposited on orthorhombic NdGaO3 (NGO) substrates grown by the molecular beam epitaxy (MBE) method. Small angle x-ray reflectivity and atomic force microscopy (AFM) results confirmed good epitaxial quality. XMCD measurements were performed at beamline 4-ID-C of the Advanced Photon Source at Argonne National Lab. XMCD spectra were taken in a 0.5 tesla field at temperatures ranging from 5 K to 180 K after the 0.5 tesla field cool. The total electron yield absorption spectra showed the oxide state characteristics of Mn, and the shapes of the Mn and O dichroism spectra change with temperature.
Margaret Zientek (Rutgers University) - Search for Di-Higgs Boson Production Through Decay to Four b-Quark Jets.
The Large Hadron Collider (LHC) at CERN is providing unique insight into the standard model of particle physics. Over the past few years the LHC has been colliding protons at increasing values of root(s), where root(s) is the center of mass energy of the collision. In 2014, the LHC will begin colliding protons at s = root(14) TeV. The Compact Muon Solenoid (CMS) is a general-purpose detector at the LHC that can be used to observe the Higgs boson. A Higgs-like boson was discovered this past July and may complete the standard model (SM); the Higgs boson is necessary to the SM as it responsible for electroweak symmetry breaking. Observing pair production of the Higgs boson is exciting because it is a rare SM process whose production rate is sensitive to physics beyond the SM. We use Monte Carlo simulation to study the CMS experiment’s potential to observe di-Higgs boson production in the fully hadronic decay to two pairs of b-quark jets. This is a challenging technique because we expect a very large SM multijet background.