Report from the PAAP. Particle Astrophysics Advisory Panel. Philip Mauskopf, Cardiff University
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1 Report from the PAAP Particle Astrophysics Advisory Panel Philip Mauskopf, Cardiff University Giles Hammond, University of Glasgow Alex Murphy: University of Edinburgh Philip Harris: University of Sussex Jim Hinton: University of Leeds Silvia Pascoli: Durham University Deborah Miller, Dave Godfrey: STFC
2 Particle Astrophysics The field of particle astrophysics encompasses projects measuring and characterising the properties of particles and radiation from space apart from standard electromagnetic radiation. These projects often lie at the intersection between Cosmology, Astrophysics and Nuclear and Particle physics. Internationally, particle astrophysics is defined by technique Two ways to measure particles from space: Direct detection - Gravity wave telescopes, Neutrino detectors and telescopes, Cosmic ray telescopes, Gamma ray telescopes, Dark matter detectors and telescopes, Other exotic particle searches e.g. axions, magnetic monopoles, etc. Indirect detection pulsar timing, CMB, weak lensing, LSS, etc. Thus there is an overlap between the activities of PAAP and FUAP / PPAP / NPAP (science and technology overlap)
3 Particle Astrophysics: The European Strategy There are 2 reviews which we feel are relevant to UK strategy; 2008 STFC programmatic review ( ASPERA ( ASPERA is a network of national government agencies responsible for coordinating and funding national research efforts in Particle Astrophysics has identified the development of a roadmap for Particle Astrophysics in Europe as one of its main deliverables
4 ASPERA Magnificent Seven (Sep 2008) A ton-scale detectors for dark matter search A ton-scale detector for the determination of the fundamental nature and mass of neutrinos A megaton-scale detector for the search for proton decay, for neutrino astrophysics and for the investigation of neutrino properties A large array of Cherenkov Telescopes for detection of cosmic high energy gamma-rays A cubic kilometre-scale neutrino telescope in the Mediterranean Sea A large array for the detection of charged cosmic rays A third-generation underground gravitational antenna
5 ASPERA European review of particle astrophysics
6 ASPERA European review of particle astrophysics Fraction of total research budget going to PA by country STFC yearly PA budget is ~ 6-8 M Lowest per capita in EU
7 PAAP Community Questionnaire Community Consultation A community consultation questionnaire was made public on June 9 th at the APP in Edinburgh The questions addressed the following; Part I: A list of projects, compiled by panel members, were given, and the community was asked to add missing projects and state areas of research which were absolutely necessary and why? Part II: Particle Astrophysics is an area where small projects can have a large impact. The community was asked what typical budget should be allocated to these projects? Part III: What are the UK areas of strength in particle astrophysics theory and what is needed to maintain and strengthen these areas? Part IV: What are the key technologies for the future, what are the areas of application and time scales for development? What is the potential economic/industrial impact of these technologies. Part V: Outreach activities and public engagement? Part VI: Anything else?
8 PAAP Community Questionnaire Community Consultation Responses were received until 31st July. These were both in the form of individual responses and coordinated responses from a field. The final statistics; 21 UK institutions 47 responses on behalf of 147 researchers. The committee then individually summarised the responses and met several times to discuss their findings. Executive Summary The UK has a high visibility and leadership in several areas of Particle Astrophysics with extremely strong pedigree both experimentally and theoretically. There were certain clear areas/projects which received high levels of support. Outreach is particularly active in the field.
9 Big Questions in Particle Astrophysics Cosmology and early universe: - What is dark energy and how has it affected the expansion history of the universe? - What is the origin and what are the properties of primordial fluctuations in the early universe? What is the imprint of these fluctuations on stochastic backgrounds (e.g. CMB, Gravity waves, neutrinos)? - What happened in the first 3 picominutes? How did the universe take on the properties it has today? Are there topological defects? What happened during GUT symmetry breaking (Was there a GUT symmetry breaking)? - Why is the universe flat? Inflation? If so, what caused inflation; at what energy scale did it happen? Does general relativity break down at large scales? Fundamental particle physics: - What is the nature of dark matter? - Do protons have a finite lifetime? - Does general relativity break down at small scales/high energies? What is the quantum nature of gravity? - What is the nature of fundamental particle interactions at extremely high energies (higher than particle accelerators can reach)? - What are the properties of neutrinos (e.g. masses, mixing angles, Majorana nature)? - Are there any particles present in the universe which we have not yet detected either directly or indirectly (e.g. axions, magnetic monopoles, inflaton, etc.)? High energy universe / Non-thermal universe: - How and where are particles accelerated to ultra-relativistic energies in our galaxy? - What is the origin of the highest energy > EeV cosmic rays? - What is the role of ultra-relativistic particles in active galaxies and in AGN/cluster feedback? - What are the properties of black holes? - What happens when black holes or neutron stars collide? - What happens during a supernova? - Are there stable states of matter at densities beyond neutron degeneracy?
10 Prioritisation Document to PPAN Main findings We generally followed the PPAN guidelines while writing the document: 1. Introduction 2. Current Programme and UK Expertise 3. Future Opportunities 4.Technology and Outreach The techniques used in Particle Astrophysics can be divided into the following broad areas (with examples of projects that have received UK support indicated in brackets): Particle astrophysics theory (cosmology, DM, GW s, neutrino s and particle accel.) Gamma ray astronomy (CTA, HESS, VERITAS) Direct dark matter detection (EURECA, LUX-ZEPLIN, DRIFT, ArDM) Gravitational wave detection (LIGO, Advanced-LIGO, LISA) Neutrinos (SNO+, LAGUNA) Cosmic rays (AUGER South, ANITA, ACORNE) CMB polarisation studies (PLANCK, CLOVER)
11 Overlaps with other panels Main findings Particle astrophysics theory PPAP and FUAP Gamma ray astronomy - FUAP (could fall through cracks) Direct dark matter detection - PPAP, NPAP Gravitational wave detection - FUAP Neutrinos - PPAP Cosmic rays CMB polarisation studies - FUAP
12 Gamma Ray Astronomy Science areas: Main findings Fundamental physics: Lorentz invariance quantum gravity Dark matter annihilation signature High energy universe (extragalactic): Gamma ray bursts Emission from AGN Starburst galaxies (NGC253 September 24, 2009) High energy universe (galactic): Binaries Pulsar wind nebulae Gamma ray pulsars
13 Main findings
14 Gamma Ray Astronomy Science areas: Main findings
15 Gamma Ray Astronomy Main findings It is essential that the UK maintain a key role in the next generation ground-based gamma ray facility: CTA CTA is the successor to the current arrays of imaging atmospheric Cherenkov telescopes (IACTs), such as HESS and VERITAS, which over the last decade have helped revolutionise our understanding of many of the highest energy phenomena in the Universe.
16 Direct Dark Matter Searches All the astronomical data consistently point to the existence of dark matter Lightest supersymmetric particle forms a very good WIMP candidate
17 Direct Dark Matter Searches Current limits and projected sensitivities
18 Direct Dark Matter Searches Main findings It is essential that the UK maintain a key role in the next generation dark matter searches LUX-ZEPLIN is the successor to the current ZEPLIN experiment led by the UK and EURECA is the successor to the current CRESST and EDELWEISS experiments with UK spokesperson. DRIFT and ArDM are important for future dark matter characterisation experiments.
19 Gravitational Waves Science areas: Main findings Fundamental physics: Extreme gravity - quantum gravity Cosmology: Early universe phase transitions History of acceleration High energy universe: Gamma ray bursts Black holes Supernovae Binary mergers High energy universe: Pulsar glitches Magnetar flares Other: Helioseismology
20 Gravitational Waves Crab Pulsar observed luminosity of the Crab nebula accounts for < 1/2 spin down power spin down due to: electromagnetic braking/particle acceleration/gw emission? LIGO s5 result: - ellipticity upper limit: ε < 2.1 x 10-4 Abbott, et al., Beating the spin-down limit on gravitational wave emission from the Crab pulsar, Ap. J. Lett. 683, L45-L49, (2008). - GW energy upper limit < 6% of radiated energy is in GWs Inspiral Exclusion Zone GRB % 50% GRB observed in direction of M31 during s5 science run 75% Binary merger in M31 scenario excluded at >99% level 90% 99% Cannot exclude an SGR in M31. (1<m1<3 Msu Abbott, et al. Implications for the Origin of GRB The Stochastic GW Background: Beating BBN! An isotropic stochastic GW background could come from: - the primordial universe (inflation) - an incoherent sum of point emitters isotropically distributed over the sky Preliminary LIGO s5/vsr1 result: Ω0, LIGO < 9.0 x 10-6 from LIGO Observations, Ap. J., 681: (2008).
21 Gravitational waves Main findings It is essential that the UK maintain a key role in the next generation gravity wave experiments The two main future projects are Advanced LIGO and LISApf/LISA
22 Neutrino Astronomy Science areas: Main Cosmology: Supernova background Cosmological neutrinos High Energy Universe: Emission from AGN GZK neutrinos Supernovae Other: Solar physics Geophysics/Atmospheric findings Fundamental particles: Neutrino mixing angles Neutrino mass hierarchy CP violation
23 Neutrino Astronomy Main findings So far: Limited to Solar, SN1987A, terrestrial
24 Neutrinos Main findings It is essential that the UK maintain a key role in the next generation neutrino experiments Neutrinoless double beta decay: Covered by PPAP. SNO+ offers solar/terrestrial detection capability Priorities: 1. Large scale neutrino detector: R&D for a future large scale neutrino detector for atmospheric, terrestrial, solar and astrophysical neutrinos is essential. Current work is organised within Europe through LAGUNA. 2. Small/Intermediate scale neutrino detector (e.g. SNO+, KM3Net)
25 Cosmic Rays Main findings It is essential that the UK maintain scientific leadership in Auger South and pursue R&D for future high energy cosmic ray detectors Priorities: 1. Auger South construction is completed and has begun science operations. These are expected to last > 10 years. The UK has a leading role in science from Auger. 2. GZK neutrino experiments (ANITA, ARA, ACORNE, LOFAR, SKA) 3. It is not recommended that the UK participate in the next generation cosmic ray facility: Auger North
26 CMB polarisation Main findings Detection of the imprint of gravitational waves on the CMB polarisation would give unique information on the initial seeds of structure in the universe. This experiment uses the entire universe as a gravitational wave detector. Detection of a stochastic GW background would have high impact
27 CMB polarisation Main findings It is essential that the UK maintain scientific and technical leadership in CMB polarisation experiments Priorities: 1. Highest priority is participation in PLANCK science 2.Next highest priority is to make use of the investment in CLOVER to make a world-leading measurement and/or participate in other international collaborations (e.g. EBEX, QUITE, SPIDER, QUIJOTE, etc.)
28 PAAP Prioritisation Main findings Given the fact that individual grant applications and SOI s were not available we decided not to explicitly prioritise projects. Instead, the approach we have taken is to highlight to PPAN areas under the criteria of Breadth, Risk Level, Impact, UK Strength and Cost We recommend supporting a portfolio of facilities in particle astrophysics that balances scientific breadth, impact, UK strength and cost and includes strong support for theory and exploitation of facilities. The table below gives our prioritisation of the different areas in each of these categories. Area Breadth Risk level Impact level UK strength Cost Gamma rays Medium Low Medium/High Medium Low Cosmic Rays Low/Medium Low Medium Medium/High Low CMB-Pol Low High High High Medium Dark Matter Low High High High Medium Gravity Waves Medium/High Medium High High High Neutrino detectors Medium/High Medium/High Medium Medium/High Medium
29 Future Opportunities We fell that participation in R&D, construction and science activities for future large facilities in the following areas is essential: Gamma rays Neutrinos Dark Matter Gravitational Waves We find that support in the following areas is essential primarily for exploitation of current facilities: CMB-Pol Cosmic rays We also encourage innovative ideas and support for small projects. Some examples: Inverse Square Law test eedm
30 Future Opportunities Some technologies: Gamma rays: Solid state PMT equivalents Dark matter and neutrinos: Liquid noble gases TPC detectors Superconducting cryogenic detectors (e.g. TES, KID) Large format calorimeters Gravity waves: Mirror coatings Precision range-finding interferometers Mechanical isolation suspension CMB polarisation: Detectors, OMTs, horns/antennas, readouts
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