Search Results - "Mirbabayi, Mehrdad"
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An observer’s measure of de Sitter entropy
Published in The journal of high energy physics (09-10-2024)“…A bstract The two-point correlation function of a massive field ⟨ χ ( τ ) χ (0)⟩, measured along an observer’s worldline in de Sitter (dS), decays…”
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Uptunneling to de Sitter
Published in The journal of high energy physics (01-09-2020)“…A bstract We propose a Euclidean preparation of an asymptotically AdS 2 spacetime that contains an inflating dS 2 bubble. The setup can be embedded in a four…”
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Low-temperature entropy in JT gravity
Published in The journal of high energy physics (01-06-2021)“…A bstract For ensembles of Hamiltonians that fall under the Dyson classification of random matrices with β ∈ {1, 2, 4}, the low-temperature mean entropy can be…”
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Probing de Sitter from the horizon
Published in The journal of high energy physics (12-04-2023)“…A bstract In a QFT on de Sitter background, one can study correlators between fields pushed to the future and past horizons of a comoving observer. This is a…”
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Gravity as an ensemble and the moment problem
Published in The journal of high energy physics (01-06-2021)“…A bstract If a bulk gravitational path integral can be identified with an average of partition functions over an ensemble of boundary quantum theories, then a…”
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Asymptotic fragility, near AdS2 holography and T T ¯ $$ T\overline{T}
Published in The journal of high energy physics (01-09-2017)“…Abstract We present the exact solution for the scattering problem in the flat space Jackiw-Teitelboim (JT) gravity coupled to an arbitrary quantum field…”
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RADIO EMISSION FROM RED-GIANT HOT JUPITERS
Published in The Astrophysical journal (01-04-2016)“…ABSTRACT When planet-hosting stars evolve off the main sequence and go through the red-giant branch, the stars become orders of magnitudes more luminous and,…”
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Dressed Hard States and Black Hole Soft Hair
Published in Physical review letters (18-11-2016)“…A recent, intriguing Letter by Hawking, Perry, and Strominger suggests that soft photons and gravitons can be regarded as black hole hair and may be relevant…”
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Proof of ghost freedom in de Rham-Gabadadze-Tolley massive gravity
Published in Physical review. D, Particles, fields, gravitation, and cosmology (01-10-2012)“…We identify different helicity degrees of freedom of Fierz-Paulian massive gravity around generic backgrounds. We show that the two-parameter family proposed…”
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10
Asymptotic fragility, near AdS2 holography and TT
Published in The journal of high energy physics (27-09-2017)“…A bstract We present the exact solution for the scattering problem in the flat space Jackiw-Teitelboim (JT) gravity coupled to an arbitrary quantum field…”
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11
Natural tuning: towards a proof of concept
Published in The journal of high energy physics (01-09-2013)“…A bstract The cosmological constant problem and the absence of new natural physics at the electroweak scale, if confirmed by the LHC, may either indicate that…”
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Gravitational waves and the scale of inflation
Published in Physical Review D (Particles, Fields, Gravitation and Cosmology) (12-03-2015)“…We revisit alternative mechanisms of gravitational wave production during inflation and argue that they generically emit a non-negligible amount of scalar…”
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13
A Lower Bound on Dark Matter Mass
Published in Physical review letters (31-05-2024)“…We argue that there is a lower bound of order 10^{-19} eV on dark matter mass if it is produced after inflation via a process with finite correlation length…”
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14
Two component charged condensate in white dwarfs
Published in Physics letters. B (24-01-2011)“…The possibility of the formation of a condensate of charged spin-0 nuclei inside white dwarf cores, studied in [G. Gabadadze, R.A. Rosen, JCAP 0810 (2008) 030,…”
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15
Snowmass white paper: Effective field theories in cosmology
Published in PHYSICS OF THE DARK UNIVERSE (01-05-2023)“…Small fluctuations around homogeneous and isotropic expanding backgrounds are the main object of study in cosmology. Their origin and evolution is sensitive to…”
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16
Generalized framework for auxiliary extra dimensions
Published in Physics letters. B (27-07-2011)“…The theory of gravity with an auxiliary extra dimension is known to give the ghost-free cubic completion of the Fierz–Pauli mass term in the decoupling limit…”
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Loosely coupled particles in warm inflation
Published 26-09-2024“…Cosmological perturbations in warm inflation are conventionally described by an EFT. It consists of the inflaton field coupled to a radiation fluid and applies…”
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An Observer's Measure of De Sitter Entropy
Published 13-11-2023“…The two-point correlation function of a massive field $\langle \chi(\tau)\chi(0)\rangle$, measured along an observer's worldline in de Sitter (dS), decays…”
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A comment about the cosmology on a bubble wall
Published 25-10-2022“…The interface between a big bubble of true AdS$_D$ vacuum expanding inside a false AdS$_D$ vacuum is a model of an inflating $D-1$ dimensional universe. It…”
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Equivalence principle and the baryon acoustic peak
Published in Physical review. D, Particles, fields, gravitation, and cosmology (21-08-2015)“…We study the dominant effect of a long wavelength density perturbation [delta]([lambda] sub()L on short distance physics. In the nonrelativistic limit, the…”
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