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segunda-feira, 30 de junho de 2014
Inflation in a two 3-form fields scenario - K. Sravan Kumar et al JCAP06(2014)064 doi:10.1088/1475-7516/2014/06/064
Inflation in a two 3-form fields scenario - Abstract - Journal of Cosmology and Astroparticle Physics - IOPscience:
"Journal of Cosmology and Astroparticle Physics Volume 2014 June 2014
K. Sravan Kumar et al JCAP06(2014)064
doi:10.1088/1475-7516/2014/06/064
Inflation in a two 3-form fields scenario
K. Sravan Kumara, b,
J. Marto a,b,
Nelson J. Nunes c
and
P. Vargas Moniz a,b
Show affiliations
Abstract A setting constituted by 3-form fields, without any direct interaction between them, minimally coupled to gravity, is introduced in this paper as a framework to study the early evolution of the universe. We focus particularly on the two 3-forms case. An inflationary scenario is found, emerging from the coupling to gravity. More concretely, the fields coupled in this manner exhibit a complex interaction, mediated by the time derivative of the Hubble parameter. Our investigation is supported by means of a suitable choice of potentials, employing numerical methods and analytical approximations. In more detail, the oscillations on the small field limit become correlated, and one field is intertwined with the other. In this type of solution, a varying sound speed is present, together with the generation of isocurvature perturbations. The mentioned features allow to consider an interesting model, to test against observation. It is subsequently shown how our results are consistent with current CMB data (viz.Planck and BICEP2).
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Keywords inflation cosmological parameters from CMBR E-print Number: 1404.0211 Cited: by | Refers: to PACS 98.80.Cq Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.) 04.50.-h Higher-dimensional gravity and other theories of gravity 98.70.Vc Background radiations Subjects Gravitation and cosmology Astrophysics and astroparticles
Dates
Issue 06 (June 2014) Received 11 April 2014, accepted for publication 30 May 2014 Published 30 June 2014"
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domingo, 29 de junho de 2014
quinta-feira, 26 de junho de 2014
BBC - Travel - Living in: Great university towns : Living in...,
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'via Blog this' The Honourable Schoolboy
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quarta-feira, 25 de junho de 2014
Strings 2014
Strings 2014:
Is inflation science? The issue has been addressed by Paul Steinhardt, Peter Coles http://telescoper.wordpress.com/2014/06/05/has-bicep2-bitten-the-dust/, Ted Bunnhttp://blog.richmond.edu/physicsbunn/2014/06/04/even-if-bicep2-is-wrong-inflation-is-still-science/, and Alan Guth among others. Great talks by Steinhardt and Matias Zaldarriaga at Strings2014http://physics.princeton.edu/strings2014/Talk_titles.shtml presenting the two sides. I'm somewhere in the middle and think that dark matter is subject to the same critique.
Is inflation science? The issue has been addressed by Paul Steinhardt, Peter Coles http://telescoper.wordpress.com/2014/06/05/has-bicep2-bitten-the-dust/, Ted Bunnhttp://blog.richmond.edu/physicsbunn/2014/06/04/even-if-bicep2-is-wrong-inflation-is-still-science/, and Alan Guth among others. Great talks by Steinhardt and Matias Zaldarriaga at Strings2014http://physics.princeton.edu/strings2014/Talk_titles.shtml presenting the two sides. I'm somewhere in the middle and think that dark matter is subject to the same critique.
Plenary and Parallel Talks
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Name
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Title
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Anderson
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Hidden geometry in heterotic string and F-theory
compactifications
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slides
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video
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Basso
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Scattering amplitudes at strong coupling beyond the
area paradigm
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slides
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video
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Baumann
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B-modes and the Nature of Inflation
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slides
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video
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Bizon
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Gravitational turbulent instability of AdS5
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video
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de Boer
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The entropy of a hole in space-time
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video
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Bousso
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A Proof of the Covariant Bound
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video
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Cachazo
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Scattering Equations
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slides
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video
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Casini
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Entropy inequalities and quantum field theory
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video
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Cheng
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Umbral Moonshine and String Theory
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slides
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video
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Chesler
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A holographic perspective on the Kibble-Zurek
mechanism
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slides
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video
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Conlon
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Moduli, a 0.1-1 keV Cosmic Axion Background and the
Galaxy Cluster Soft Excess
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slides
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video
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Cordova
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Toda CFT from Six Dimensions
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slides
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video
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Cremonini
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Probing the structure of quantum phases of matter
with holography
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slides
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video
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Dabholkar
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Quantum Black Holes and Quantum Holography
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slides
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video
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Dolan
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Amplitudes and the Scattering Equations, Proofs and
Polynomials
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slides
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video
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Erdmenger
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Applications of AdS/CFT to high energy and condensed
matter physics
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video
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Esole
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Singularities and Gauge Theory Phases
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slides
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video
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Freedman
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Precision Tests of the AdS/CFT Correspondence
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video
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Gaiotto
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Topological order in N=1 Super Yang Mills theory
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video
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Gauntlett
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Holographic Lattices, Metals and Insulators
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video
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Gomis
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Sphere Partition Functions, the Zamolodchikov Metric
and Surface Operators
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slides
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video
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Gopakumar
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From Higher Spins to Strings
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video
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Graham
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New methods for discovering light fields
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video
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Green
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Visionary
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slides
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video
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Gromov
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Quantum spectral curve and AdS/CFT spectral problem
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slides
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video
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Gross
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Visionary
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slides
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video
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Guica
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A toy model for the Kerr/CFT correspondence
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slides
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video
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Hanada
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Monte Carlo approach to string/M-theory
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slides
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video
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Hellerman
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String Theory of the Regge Intercept
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slides
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video
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Hubeny
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Holographic Entanglement
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slides
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video
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Kachru
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Mock Modular Moonshine for M22 and M23
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slides
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video
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Klevers
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Recent Progress on the Abelian Sector of F-theory
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slides
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video
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Komargodski
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A Cardy-like formula in four dimensions
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video
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Kovac
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Detection of B-mode Polarization at Degree Angular
Scales with BICEP2
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slides
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video
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Kutasov
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ADE N=1 SUSY Dynamics
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slides
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video
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Sangmin Lee
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Scattering amplitudes in three dimensions
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slides
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video
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Sungjay Lee
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RR Charge and Gamma Class
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slides
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video
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Leigh
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The Exact Renormalization Group and Higher Spin
Holography
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slides
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video
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Liu
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Entanglement Tsunami
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video
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Mafra
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The closed-string 3-loop amplitude
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slides
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video
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Maldacena
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Visionary
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slides
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video
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Marchesano
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F-term axion monodromy inflation
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video
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Marino
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Non-perturbative effects in M-theory
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video
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Minahan
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Three-point correlators from string theory
amplitudes
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slides
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video
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Moore
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Visionary: Physical Mathematics and the Future
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slides
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video
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Murugan
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Meromorphic functions and the topology of giants
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slides
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video
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Neitzke
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A smooth R3 index for N=2 theories in four dimensions
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slides
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video
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Nekrasov
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Nonperturbative Dyson-Schwinger identities in gauge
theories and sigma models
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slides
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video
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Papadodimas
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The black hole interior in AdS/CFT
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video
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Polchinski
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Black Hole Information: Spacetime versus Quantum
Mechanics
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video
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van Raamsdonk
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Gravitation from Entanglement
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video
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Raju
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State dependent operators and the information
paradox
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slides
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video
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Rastelli
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The Superconformal Bootstrap
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video
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Sen
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Mass renormalization and vacuum shift in string
theory
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video
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Silverstein
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The powers of monodromy
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video
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Simmons-Duffin
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Bootstrapping the 3d Ising Model
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video
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Staudacher
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N=4 Scattering Amplitudes and the Regularized
Graßmannian
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slides
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video
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Steinhardt
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What has been learned from BICEP2?
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video
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Stieberger
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Unity of tree–level superstring amplitudes
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slides
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video
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Strominger
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Visionary
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slides
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video
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Sundrum
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BTZ/CFT
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slides
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video
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Tachikawa
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Recent advances in SUSY
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slides
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video
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Takayanagi
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Quantum Entanglement and Local Operators
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slides
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video
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Tomasiello
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New gravity duals for higher-dimensional
superconformal theories
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slides
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video
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Tonni
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Entanglement negativity in conformal field theory
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slides
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video
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Trnka
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Four-point scattering from Amplituhedron
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slides
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video
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Tseytlin
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Strings in AdS and their deformations
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slides
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video
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Vafa
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On 6d SCFT's
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slides
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video
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Vasiliev
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Higher-rank fields, currents and higher spin
holography
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slides
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video
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Warner
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Resolving Black Holes via Microstate Geometries
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video
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Witten
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Opening Remarks
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slides
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video
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Weigand
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Mordell-Weil torsion and matter spectra in F-theory
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slides
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video
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Zaldarriaga
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The dawn of B-mode cosmology
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video
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The Honourable Schoolboy
Mass redundancies at King's College London are destroying morale | Higher Education Network | Guardian Professional
Mass redundancies at King's College London are destroying morale | Higher Education Network | Guardian Professional: "up to 120 academic staff redundant across the schools of medicine, biomedical sciences and the world renowned Institute of Psychiatry"
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Partida de Futebol dos Filósofos (The Philosophers' Football Match) - Mo...
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Serviço de Obstetrícia obtém excelência clínica | LOCAL.PT: "O Hospital Pêro da Covilhã à semelhança de outros de Portugal, obteve a classificação máxima na área da obstetrícia onde foram avaliados os procedimentos relativos a partos e cuidados pré-natais."
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2014 Astrophysics Citation | The Kavli Foundation
2014 Astrophysics Citation | The Kavli Foundation: "for pioneering the theory of cosmic inflation"
'via Blog this' The Honourable Schoolboy
'via Blog this' The Honourable Schoolboy
BBC Sport - England v Sri Lanka, second Test, day five, Headingley
BBC Sport - England v Sri Lanka, second Test, day five, Headingley: "his series has been a cracking advert for Test cricket."
'via Blog this' The Honourable Schoolboy
'via Blog this' The Honourable Schoolboy
segunda-feira, 23 de junho de 2014
BBC Sport - England v Sri Lanka, second Test, day four, Headingley
BBC Sport - England v Sri Lanka, second Test, day four, Headingley: ""Who said it's a funny old game? anything short he's hit. They were going to lose without his knock. Now they might have enough runs to win it. England will have to play out their skins.""
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Restructure the Humanities Ph.D. - Commentary - The Chronicle of Higher Education
Restructure the Humanities Ph.D. - Commentary - The Chronicle of Higher Education: "Restructure the Humanities Ph.D."
'via Blog this' The Honourable Schoolboy
'via Blog this' The Honourable Schoolboy
British researchers win £1.8m mathematics prize | Science | theguardian.com
British researchers win £1.8m mathematics prize | Science | theguardian.com: "British researchers win £1.8m mathematics prize"
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'via Blog this' The Honourable Schoolboy
And a Hologram in Every Lecture Hall: Marketing 3D Tech to Universities – Wired Campus - Blogs - The Chronicle of Higher Education
domingo, 22 de junho de 2014
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