Observational implications of cosmological event horizons

Nemanja Kaloper, Matthew Kleban, Lorenzo Sorbo

    Research output: Contribution to journalArticle

    Abstract

    In a universe dominated by a small cosmological constant or by eternal dark energy with equation of state ω <-1/3, observers are surrounded by event horizons. The horizons limit how much of the universe the observers can ever access. We argue that this implies a bound N∼60 on the number of e-folds of inflation that will ever be observable in our universe if the scale of the dark energy today is ∼(10 -3 eV) 4. This bound is independent of how long inflation lasted, or for how long we continue to observe the sky. The bound arises because the imprints of the inflationary perturbations thermalize during the late acceleration of the universe. They "inflate away" just like the initial inhomogeneities during ordinary inflation. Thus the current CMB data may be looking as far back in the history of the universe as will ever be possible, making our era a most opportune time to study cosmology.

    Original languageEnglish (US)
    Pages (from-to)7-14
    Number of pages8
    JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Volume600
    Issue number1-2
    DOIs
    StatePublished - Oct 21 2004

    Fingerprint

    event horizon
    universe
    dark energy
    cosmology
    horizon
    sky
    inhomogeneity
    equations of state
    histories
    perturbation

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

    Observational implications of cosmological event horizons. / Kaloper, Nemanja; Kleban, Matthew; Sorbo, Lorenzo.

    In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 600, No. 1-2, 21.10.2004, p. 7-14.

    Research output: Contribution to journalArticle

    Kaloper, Nemanja ; Kleban, Matthew ; Sorbo, Lorenzo. / Observational implications of cosmological event horizons. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2004 ; Vol. 600, No. 1-2. pp. 7-14.
    @article{39253af0de4d4f6692a9c3b10c6fdf68,
    title = "Observational implications of cosmological event horizons",
    abstract = "In a universe dominated by a small cosmological constant or by eternal dark energy with equation of state ω <-1/3, observers are surrounded by event horizons. The horizons limit how much of the universe the observers can ever access. We argue that this implies a bound N∼60 on the number of e-folds of inflation that will ever be observable in our universe if the scale of the dark energy today is ∼(10 -3 eV) 4. This bound is independent of how long inflation lasted, or for how long we continue to observe the sky. The bound arises because the imprints of the inflationary perturbations thermalize during the late acceleration of the universe. They {"}inflate away{"} just like the initial inhomogeneities during ordinary inflation. Thus the current CMB data may be looking as far back in the history of the universe as will ever be possible, making our era a most opportune time to study cosmology.",
    author = "Nemanja Kaloper and Matthew Kleban and Lorenzo Sorbo",
    year = "2004",
    month = "10",
    day = "21",
    doi = "10.1016/j.physletb.2004.08.068",
    language = "English (US)",
    volume = "600",
    pages = "7--14",
    journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
    issn = "0370-2693",
    publisher = "Elsevier",
    number = "1-2",

    }

    TY - JOUR

    T1 - Observational implications of cosmological event horizons

    AU - Kaloper, Nemanja

    AU - Kleban, Matthew

    AU - Sorbo, Lorenzo

    PY - 2004/10/21

    Y1 - 2004/10/21

    N2 - In a universe dominated by a small cosmological constant or by eternal dark energy with equation of state ω <-1/3, observers are surrounded by event horizons. The horizons limit how much of the universe the observers can ever access. We argue that this implies a bound N∼60 on the number of e-folds of inflation that will ever be observable in our universe if the scale of the dark energy today is ∼(10 -3 eV) 4. This bound is independent of how long inflation lasted, or for how long we continue to observe the sky. The bound arises because the imprints of the inflationary perturbations thermalize during the late acceleration of the universe. They "inflate away" just like the initial inhomogeneities during ordinary inflation. Thus the current CMB data may be looking as far back in the history of the universe as will ever be possible, making our era a most opportune time to study cosmology.

    AB - In a universe dominated by a small cosmological constant or by eternal dark energy with equation of state ω <-1/3, observers are surrounded by event horizons. The horizons limit how much of the universe the observers can ever access. We argue that this implies a bound N∼60 on the number of e-folds of inflation that will ever be observable in our universe if the scale of the dark energy today is ∼(10 -3 eV) 4. This bound is independent of how long inflation lasted, or for how long we continue to observe the sky. The bound arises because the imprints of the inflationary perturbations thermalize during the late acceleration of the universe. They "inflate away" just like the initial inhomogeneities during ordinary inflation. Thus the current CMB data may be looking as far back in the history of the universe as will ever be possible, making our era a most opportune time to study cosmology.

    UR - http://www.scopus.com/inward/record.url?scp=4644295552&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=4644295552&partnerID=8YFLogxK

    U2 - 10.1016/j.physletb.2004.08.068

    DO - 10.1016/j.physletb.2004.08.068

    M3 - Article

    AN - SCOPUS:4644295552

    VL - 600

    SP - 7

    EP - 14

    JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

    JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

    SN - 0370-2693

    IS - 1-2

    ER -