Harvard University Department of Physics #division #answers


#physics answers

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UPCOMING EVENTS

  1. PRT SEM: Masaki Yamada (TUFTS) Strongly interacting massive particle (SIMP) and a strong U(1) gauge theory
    Start: 04:15pm – End: 05:15pm
    • 04:15pm

“A strongly interacting massive particle (SIMP) is a good candidate for dark matter (DM) because its self-interaction can address some astrophysical offsets, such as the “core vs cusp” problem and the “too-big-to-fail” problem. A low energy effective theory of a strongly interacting non-Abelian gauge theory gives a simple realization of the SIMP mechanism in a dark sector, though we need to introduce a nontrivial interaction between the Standard Model (SM) sector and the dark sector to maintain kinetic equilibrium. In this talk, I will first explain a SIMP model in a strong non-Abelian gauge theory with a singlet field in the hidden sector. Assuming a mixing between the singlet field and the SM Higgs field, we can maintain the kinetic equilibrium between the hidden and SM sectors. The mixing effect leads to signals for future collider experiments, direct DM detection experiments, and beam-dump experiments. Then I will explain a SIMP model in an Abelian gauge theory that is confined due to a monopole condensation. This model is much simpler because the monopole plays the roles of U(1) confinement and mediator between the hidden and SM sectors.”

  1. CMP Special Seminar: Arbel Haim (The Weizmann Institute), hosted by Bertrand Halperin
    Start: 03:00pm – End: 04:30pm
    • 03:00pm

Title: “Current aspects of topological superconductivity”

Abstract: Recent experiments have provided mounting evidence for the existence of Majorana bound states (MBSs) in condensed-matter systems. Until the long-term goal of braiding MBSs is achieved, one is prompted to ask: what is the next step in the study of topological superconductivity and MBSs? In my talk I will discuss two topics relating to this question. In the first part I will examine the possibility of, not only detecting the Majoranas, but also witnessing some of their exotic properties. In particular their non-local nature, or in other words, the fact that the MBS is half a fermion whose occupation is encoded in a nonlocal way. I will show that current cross correlations in a T-junction with a single MBS exhibit universal features, related to the Majorana nonlocality. This will be contrasted with the case of an accidental low-energy Andreev bound state. In the second part I will discuss the possibility of realizing a different topological phase hosting MBSs in currently available experimental platforms. This will be a topological superconducting phase which is protected by time-reversal symmetry, and which is characterized by having a Kramers’ pair of MBSs at each end. As I will discuss, repulsive interactions are a necessary ingredient for the realization of this phase. I will present a mechanism, based on the interplay between repulsive interactions and proximity to a conventional superconductor, which drives the system into the topological phase. The effect of interactions is studied analytically using both a mean-field approach and the renormalization group. We corroborate our conclusions numerically using DMRG.

[1] Arbel Haim, Anna Keselman, Erez Berg, Yuval Oreg, Phys. Rev. B, 89, 220504(R) (2014)
[2] Arbel Haim, Erez Berg, Felix von Oppen, Yuval Oreg, Phys. Rev. B, 92, 245112 (2015)
[3] Arbel Haim, Erez Berg, Felix von Oppen, Yuval Oreg, Phys. Rev. Lett. 114, 166406 (2015)
[4] Arbel Haim, Konrad Wölms, Erez Berg, Yuval Oreg, Karsten Flensberg, Phys. Rev. B 94, 115124 (2016)
[5] Arbel Haim, Erez Berg, Karsten Flensberg, Yuval Oreg, arXiv:1605.07179

Thursday, October 27th

  1. CMP Seminar: Victor Galitski (University of Maryland), hosted by Eugene Demler
    Start: 12:00pm – End: 01:00pm
    • 12:00pm

Title: Soliton motion, dissipation, and death in quantum superfluids

Abstract: Solitons are fascinating non-linear phenomena that occur in a diverse array of classical and quantum systems. In particular, they are known to exist in quantum superfluids, and have been demonstrated experimentally in Bose-Einstein condensates and fermionic superfluids. In this talk, I will first review the general theory of solitons in superfluids and present an exact solution to the problem of a moving soliton in a one-dimensional superconductor. Connections to the inverse scattering method and supersymmetric quantum mechanics will be emphasized. Using these exact methods, the full soliton spectrum will be derived along with its “inertial” and “gravitational” masses. The former will be shown to be orders of magnitude larger than the latter. This results in slow motion of the soliton, consistent with recent MIT experiments. In the second part of my talk, I will discuss the soliton decay and derive the quasiclassical equations of motion containing a non-local in time friction force. Interestingly, Ohmic friction is absent in the integrable setup and the Markovian approximation gives rise to the Abraham-Lorentz force (i.e. a term proportional to the derivative of the soliton’s acceleration), which is known from classical electrodynamics of a charged particle interacting with its own radiation. These Abraham-Lorentz equations famously contain a fundamental causality paradox, where the soliton/particle interacts with excitations/radiation originating from future events. We show, however, that the causality paradox is an artifact of the Markovian approximation, and our exact non-Markovian dissipative equations give rise to physical trajectories. In the end, I will show results of recent experiment that observed soliton diffusion and decay in superfluids, well described by our theory.

Relativistic electron scattering and QED

Abstract:
The results of non-perturbative relativistic electron-atom scattering calculations are presented. Hans Bethe’s work on relativistic electron scattering in the 1930’s is also discussed, together with various historical aspects of Enrico Fermi’s and Bethe’s early QED papers. The evolution of ideas related to the use of renormalization in quantum field theory are outlined.

  • View in Google Calendar
  • STR SEM: Sam McCandish (Stanford) A Stereoscopic Look into the Bulk
    Start: 04:15pm – End: 05:15pm
    • 04:15pm
    • We present the foundation for a holographic dictionary with depth perception. The dictionary consists of natural operators associated with CFT bilocals whose duals are simple, diffeomorphism-invariant bulk operators. These objects admit a description as fields in kinematic space, a phase space for such probes. The framework of kinematic space allows for conceptually simple derivations of many results known in the literature, including linearized Einstein’s equations, the relationship between conformal blocks and geodesic Witten diagrams, and the CFT representation of bulk local operators. Reference: https://arxiv.org/abs/1604.03110

      Friday, October 28th

      Monday, October 31st

      1. Ali Yazdani (Princeton): Loeb Lecture in Physics: Spotting the elusive Majorana under the microscope
        Start: 04:15pm – End: 06:15pm
        • 04:15pm
        • View in Google Calendar
      2. Loeb Colloquium: Ali Yazdani (Princeton), Visualizing a nematic quantum liquid
        Start: 04:15pm – End: 06:00pm
        • 04:15pm

      The MORRIS LOEB LECTURES IN PHYSICS SERIES
      Speaker: Ali Yazdani,
      Class of 1909 Professor of Physics,
      Director of the Princeton Center for Complex Materials
      Princeton University

      The lecture is free and open to the public
      https://www.physics.harvard.edu/events/loeb


  • Interactive Physics Example Problems – Physics – University of Wisconsin-Green Bay #ask


    #answers to physics problems

    #

    • Problems

    Physics Problems Examples

    Select an example physics problem from the list below. If you need more information, move your cursor around on the figures and solutions. Shaded boxes are links that show the relationship between figures and equations and that bring up explanatory text.

    These are straightforward problems that take you between two closely related concepts. Definition problems may be strictly mathematical (e.g. components of a vector), may involve rates (e.g. acceleration is the rate at which velocity changes), or they may simply be definitions (e.g. pressure is defined as force/area).

    Also known as motion problems, these problems ask you to describe motion. Time is a key variable that tells you to work with the kinematic equations. If you are only asked for positions and velocities, you may also be able to work the problem using Conservation of Energy.

    Dynamics (Force) problems ask you to relate motion to the forces causing it. Note that the word “force” isn’t always used explicitly in the statement of the problem. You know many forces such as gravity, tension, and normal force that are present even if not listed in the problem.

    These problems relate speed of an object at different positions. In order to work a problem using Conservation of Energy, you need to know either that there are no significant forces taking energy out of the system or the size of those forces. Conservation of Energy will not tell you about the time it takes to go between two positions.

    Electricity Magnetism problems are often found in other categories. In addition to definition problems (e.g. electric force or field due to point charges), you use electric force in Dynamics problems and electric energy in Conservation of Energy problems. Unique to Electricity Magnetism, however, are problems involving electric circuits or electromagnetic induction.

    Two areas of modern physics are addressed through example problems on this page. Special Relativity problems ask you to relate the observations of two observers measuring the same thing. In Quantum Mechanics problems, you may look at wave or particle behavior of light and subatomic particles. As always, basic definitions problems are found with other Definitions examples.

    Whenever two waves of the same type are in the same place at the same time, they interfer with each other. This might happen when two waves are created and overlap, or when one wave reflects off of a new material (the reflected wave traveling in one direction interfers with the initial wave traveling in the other direction.) Standing waves are created when the waves always cancel in some places. In most problems, key words like “standing wave,” “interference pattern,” “diffraction pattern,” or “thin film” will initially tip you off to approach the problem through standing waves. This is also the physics behind musical instruments.


    Twenty First Century Science Online Homework: Secondary: Oxford University Press #answer #boots


    #science homework answers

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    Twenty First Century Science Online Homework

    Twenty First Century Science Online Homework

    Everything you need to support and track your students’ learning outside the classroom, with ready-made interactive, auto-marked homework activities for every week of your GCSE teaching.

    • A bank of ready-made, interactive auto-marked activities to save you time
    • Students’ marks are stored on the site so you can monitor progress quickly and easily
    • Let students practise the activities before they submit their answers
    • Give your students credit for every correct answer, with formative feedback to encourage progress
    • Upload your own favourite worksheets and assignments and use Online Homework to set and track them easily
    • Includes teacher access to a digital version of the matching Student Book
    • Purchase Online Student Book access for your students, so they can get a digital edition of their textbook online, with annotation tools

    Read more

    Series contains:

  • 8 Student Books
  • 8 Workbooks
  • 6 Online Homework
  • 6 Online Student Books
  • 6 Resources Planning Packs
  • 6 Revision Guides
  • 6 Exam Preparation and Assessment OxBox CD-ROMs
  • 6 Resources Planning iPack OxBox CD-ROMs

    The specification in this catalogue, including limitation price, format, extent, number of illustrations and month of publication, was as accurate as possible at the time the catalogue was compiled. Occasionally, due to the nature of some contractual restriction, we are unable to ship specific products to a particular territory. Jacket images are provisional and liable to change before publication.

    2016 Oxford University Press. All rights reserved.


  • AQA GCSE Science Online Homework: Secondary: Oxford University Press #find #answers #to


    #science homework answers

    #

    AQA GCSE Science Online Homework

    AQA GCSE Science Online Homework

    Everything you need to support and track your students’ learning outside the classroom, with ready-made interactive, auto-marked homework activities for every week of your GCSE teaching.

    • A bank of ready-made, interactive auto-marked activities to save you time
    • Students’ marks are stored on the site so you can monitor progress quickly and easily
    • Let students practise the activities before they submit their answers
    • Give your students credit for every correct answer, with formative feedback to encourage progress
    • Upload your own favourite worksheets and assignments and use Online Homework to set and track them easily
    • Includes teacher access to a digital version of the matching Student Book
    • Purchase Online Student Book access for your students, so they can get a digital edition of their textbook online, with annotation tools

    Read more

    Series contains:

  • 6 Student Books
  • 6 Online Homework
  • 6 Online Student Books
  • 6 Revision Guides
  • 6 Resources and Planning Packs
  • 6 Resources Planning OxBox CD-ROMs
  • 6 Exam Preparation Assessment OxBox CD-ROMs

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    Accessible textbook for Edexcel A Level Year 2 – online

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    The specification in this catalogue, including limitation price, format, extent, number of illustrations and month of publication, was as accurate as possible at the time the catalogue was compiled. Occasionally, due to the nature of some contractual restriction, we are unable to ship specific products to a particular territory. Jacket images are provisional and liable to change before publication.

    2016 Oxford University Press. All rights reserved.


  • Oxford University Press #the #answer


    #economics answers

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    King: Economics

    Answers to the Questions for Review

    Click the chapter links below to view the solutions to the Questions for Review from each chapter of the book. The solutions are in PDF documents and will open in a new window.

    Chapter 1 The Nature of Economics (PDF) Chapter 2 Scarcity, Governments, and Economists (PDF) Chapter 3 Supply and Demand (PDF) Chapter 4 Elasticity of Demand and Supply (PDF) Chapter 5 Governments and Markets (PDF) Chapter 6 Household Behaviour (PDF) Chapter 7 Introducing the Theory of the Firm (PDF) Chapter 8 Costs and Production Methods (PDF) Chapter 9 Perfect Competition (PDF) Chapter 10 Monopoly and Monopolistic Competition (PDF) Chapter 11 Oligopoly (PDF) Chapter 12 Government, Monopolies, and Oligopolies (PDF) Chapter 13 Governments and Resource Allocation (PDF) Chapter 14 Markets for Labour (PDF) Chapter 15 Land and Capital (PDF) Chapter 16 Governments and the Distribution of Income (PDF) Chapter 17 Introduction to Macroeconomics (PDF) Chapter 18 The National Accounts (PDF) Chapter 19 GDP and the Multiplier Model (PDF) Chapter 20 Money, Banks, and Interest Rates (PDF) Chapter 21 GDP and Prices: the AS–AD model (PDF) Chapter 22 Unemployment (PDF) Chapter 23 Inflation and Unemployment (PDF) Chapter 24 Business Cycles (PDF) Chapter 25 Economic Growth (PDF) Chapter 26 Monetary, Fiscal, and Supply-side Policies (PDF) Chapter 27 International Trade (PDF) Chapter 28 International Finance (PDF)

    About the book

    Find out more, read a sample chapter, or order an inspection copy if you are a lecturer, from the Higher Education website

    Our email service will alert you when new material is added to this Online Resource Centre. Simply send the email, leaving the subject line King Economics: Keep me updated as it appears.

    Copyright © Oxford University Press, 2016. All Rights Reserved.


    Dynamics (Force or Newtons 2nd Law) Problems – Physics – University of


    #physics problems and answers

    #

    Electricity and Magnetism
    1.Identify the Problem

    Any problem that asks you to relate force and motion is a Newton’s Second Law problem, no matter what was given or requested in the problem. In some cases, Newton’s Second Law is easy to identify—for example, a problem might ask you for the value of a particular force.

    In other cases, it is harder to recognize 2nd Law problems. You may know forces that are present without having force ever mentioned in the problem, and you may be asked for things like how fast an object moves in a circle or how much of an object is underwater. Recognizing how to approach these problems comes from experience—taking the time to answer the question “how did I know this was a 2nd Law problem” for every single force example you work will help to build that intuition which you will need on the final exam.

    2. Draw a Picture

    When you approach force problems, a free body diagram will allow you to both picture what is happening and directly map the picture into the equation. All the physics is done in the process of drawing the diagram—only algebra remains after this step.

    The first thing that you will need to do is to identify what object(s) will be the focus of the diagram—in other words, what system do you need to consider in order to answer the question. In some cases, you will need to consider several objects as separate systems. In those cases, you will draw free body diagrams and set up equations for each object separately. You will very likely use Newton’s Third Law to relate forces on the two objects.

    Once you have identified your system, think about all forces on that system, discard any that are too small to matter. Only forces acting on the object should be shown, since you are trying to understand what causes the motion of the object. The free body diagram maps directly into the left side of ∑F=ma. Acceleration is the result not the cause—if you wish to sketch the acceleration, make sure that you do so off to the side and not on the sketch of forces.

    Because Newton’s Second Law is a vector equation, you will need to divide all forces into their x- and y- components in order to work with the equation. Math is always easiest if you pick one axis to be along the direction of acceleration. That way, one component of a will be zero and you will have fewer linked equations.

    3. Select the Relation

    All force problems begin with the relation ∑F=ma. This true no matter what you are asked to find. If any additional information is needed, it will become apparent as you work through the problem.

    4. Solve the Problem

    ∑F=ma is a vector equation and so is set up separately in the x- and y- directions. Think carefully about the direction of each force and include the appropriate sign. Once you have filled your forces into these equations, you have only algebra left and can solve the equations in any way that works. In general, it is easiest to solve the equation in which a=0 first as you will sometimes need those values in the other expression.

    5. Understand the Results

    Once you have completed the problem, look at it again. Does your answer make sense? Did it give the behavior you intuitively expected to find? Can you now do steps that caused you problems earlier? Can you explain in words what is happening? If you only recognized it as a 2nd Law problem because of the section heading in your text book, identify the information that you would use to recognize a problem like this on the final exam.

    Are you certain your problem is a Newton’s Second Law problem?

    One of the most common mistakes is to think too hard. If you are told net force and asked for acceleration, or vice versa, you don’t need to go through all of the steps of a Newton’s Second Law problem. Check Definition and Ratio problems to see if you can find a useful example.

    It is also possible that your problem is better solved using kinematics (description of motion) or energy and momentum. Can you clearly explain to yourself that your problem requires you to relate the cause of motion (forces) to the effect of those forces (acceleration or changing velocity?)

    Yes, my problem is definitely a Newton’s Second Law problem.

    In that case, think more broadly about what makes a useful example. Remember, you were given your assignment to practice the problem solving approach. not because the answers to your problems are particularly interesting. An example in which you merely substitute your numbers for those in the problem will give you practice entering numbers on your calculator but will teach you nothing about physics, and when you take your exam every problem on it will feel new and different to you. So think about your example as support for helping you to practice the problem solving approach.

    And every single problem in this section uses the very same approach, so any problem is an appropriate example to help you approach your problem. It isn’t the way a problem looks that determines how you solve it, it is the type of interaction (in this case, force) that you need to consider. That said, different situations require you to do different side problems along the way. Circular motion requires you to know about centripetal acceleration, buoyant force requires you to know about density, an inclined plane required you to know how to divide vectors into components, and multiple object problems require you to understand Newton’s Third Law. So if your problem has any of these features, you may find it useful to pick an example that does as well. But don’t worry, you don’t need (or want) an example to look exactly like your problem!


    Computer Science and Engineering: Welcome to CSE @ UCR, boston university computer


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    boston university computer science

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    Prof. Papalexakis wins ACM SIGKDD Dissertation Award Distinction

    August, 2017

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    UCR PhD student wins best student work award at CoNext 2016 student workshop!

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    December, 2016

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    Lonardi recognized as an ACM Distinguished Scientist

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    CSE PhD student wins two international competitions

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    New $3 million NSF Research Traineeship award in Computational Entomology

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    Prof. Keogh publishes 30th paper in ICDM!

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    Dangerous Internet vulnerability discovered by UCR team leads to Linux patch

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    Computing the microbiome: Faster and more accurate approaches developed at the CSE Department

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    School of International Service, American University, Washington DC, American University, Washington, D,


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    School of International Service

    International theological university

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    Browse all School of International Service degrees programs

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    International

    Discover your future with AU

    The SIS PhD program prepares you for a career as a teacher and scholar at universities and research institutes in both the private and public sectors. The core curriculum covers the foundational fields of international studies: international relations, comparative and regional studies, and social theory. Our PhD graduates have received appointments at prestigious universities such as Virginia Tech and the University of Reading in Great Britain.

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    SIS Bookshelf: Rachel Sullivan Robinson

    What’s the connection between family planning and HIV prevention in sub-Saharan Africa? SIS Professor Rachel Sullivan Robinson answers this question and discusses her new book, Intimate Interventions in Global Health: Family Planning and HIV Prevention in Sub-Saharan Africa.

    What’s next after graduation?

    International theological university

    Erin Bell, SIS/MA ’16

    Fulbright English Teaching Assistant, Senegal

    With this Fulbright, I will fulfill my dream of teaching in West Africa.

    In 2014, I joined the Peace Corps in Sierra Leone to teach English, but was evacuated seven weeks later due to the Ebola crisis. While in IPCR, I taught English and chess in Morocco, but for my future career I want to focus on West Africa. Being a Fulbright English Teaching Assistant in Senegal allows me to experience and learn about one of the unique societies that make up the region. Learn more about how the SIS Class of 2017 is waging peace after graduation.

    International theological university


    Dallas Plumbing – Air Conditioning Company #air #conditioning #and #heating #dallas, #fort


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    Plumbing and HVAC Services in the Dallas-Fort Worth Area

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    Psychology Degree Programs – Department Information #ba #psychology,college #of #arts #and #sciences,ma


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    Psychology

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    Dr. Nicole Caporino. Assistant Professor of Psychology, has been selected as a 2016 “Rising Star” by the Association for Psychological Science (APS). The APS explains that “The Rising Star designation recognizes outstanding psychological scientists in the earliest stages of their research career post-PhD whose innovative work has already advanced the field and signals great potential for their continued contributions.”

    Psychologist-in-Residence and Director of the Psychobiology of Healing Program in AU’s Department of Psychology, Deborah Norris, Ph.D. recently published a book entitled In the Flow: Passion, Purpose, and the Power of Mindfulness. The book describes the function and practice of mindfulness meditation for lowering stress and enabling emotional regulation. It also presents corresponding scientific research and theories about the neurobehavioral mechanisms of action of meditation.
    In the Flow is intended for those who experience stress and would like to learn the evidence-basis for gaining greater control of emotions, and for creating more ease in life.
    In the Flow is available for purchase here (https://www.amazon.com/Flow-Passion-Purpose-Power-Mindfulness/dp/1532976909/ref=sr_1_1?ie=UTF8 qid=1485280420 sr=8-1 keywords=in+the+flow ).

    Upcoming Theses Dissertation Defenses

    Leah Rothschild will defend her dissertation on Friday, July 14, 2017 from 12-3 pm in Asbury 336. The title of her dissertation is: Parental Treatment Acceptability of Cognitive-Behavioral Interventions for Children with Neurodevelopmental Disorders.

    David Haaga, Ph.D. James Gray, Ph.D. Allison Ratto, Ph.D. Yael Granader, Ph.D. (outside reader)

    Emily Farr will defend her dissertation on Thursday, July 27, 2017 from 9:00 am-12:00 pm. The title of her dissertation is: Fear of Emotion and Antecedent Emotion Regulation.

    Anthony Ahrens Ph.D. chair
    Kathleen Gunthert Ph.D.
    Nathaniel Herr Ph.D.
    outside reader Sue Wenze Ph.D.