Results 21 to 30 of about 1,048 (184)
Fate of inflation and the natural reduction of vacuum energy
EPJ Web of Conferences, 2014 In the standard cosmology, an artificial fine tuning of the potential is inevitable for vanishing cosmological constant, though slow-rolling uniform scalar field easily causes cosmic inflation.
Nakamichi Akika, Morikawa Masahiro
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Can observations look back to the beginning of inflation?
Physics Letters B, 2016 The cosmic microwave background can measure the inflaton potential only if inflation lasts sufficiently long before the time of horizon crossing of observable fluctuations, such that non-linear effects in the time evolution of Green's functions lead to a
C. Wetterich
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Unified cosmology with scalar–tensor theory of gravity
European Physical Journal C: Particles and Fields, 2017 Unlike the Noether symmetry, a metric independent general conserved current exists for non-minimally coupled scalar–tensor theory of gravity if the trace of the energy-momentum tensor vanishes. Thus, in the context of cosmology, a symmetry exists both in
Behzad Tajahmad, Abhik Kumar Sanyal
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Primordial monopoles and strings, inflation, and gravity waves
Journal of High Energy Physics, 2021 We consider magnetic monopoles and strings that appear in non-supersymmetric SO(10) and E 6 grand unified models paying attention to gauge coupling unification and proton decay in a variety of symmetry breaking schemes.
Joydeep Chakrabortty +3 more
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Inflation on moduli space and cosmic perturbations [PDF]
Journal of High Energy Physics, 2003 23 pages, 4 figures; Added Fig. 1 and re-emphasis on dynamical selection of desirable initial angles for inflaton modulus.
Kadota K., Stewart E.D. Stewart, Ewan D
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Power series inflation and primordial gravitational waves
上海师范大学学报. 自然科学版, 2014 The tensor-to-scalar ratio can be measured by observing the polarization of photos in the cosmic microwave background.It shows very strong power on constraining inflation models.However,for a single field inflation model,it can not predict both a large ...
FENG Chaojun, LI Xinzhou
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A note on inflation in dRGT massive gravity
European Physical Journal C: Particles and Fields, 2022 Although the dRGT massive gravity successfully explains the late-time cosmic acceleration, it cannot justify inflation. On the other hand, and in the frameworks of General Relativity and modified gravity, the interests and attempts to describe dark ...
B. Afshar, N. Riazi, H. Moradpour
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Cosmic Inflation at the crossroads
Journal of Cosmology and Astroparticle PhysicsAbstract The capability of Cosmic Inflation to explain the latest Cosmic Microwave Background and Baryonic Acoustic Oscillation data is assessed by performing Bayesian model comparison within the landscape of nearly three-hundred models of single-field slow-roll inflation. We present the first Bayesian data analysis based on the
Martin, Jerome +2 more
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Recent advances in optical encryption techniques
上海师范大学学报. 自然科学版, 2015 The tensor-to-scalar ratio can be measured by observing the polarization of photos in the cosmic microwave background.It shows very strong power on constraining inflation models.However,for a single field inflation model,it can not predict both a large ...
YAN Aimin, HU Zhijuan, POON Tingchung
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Physics Letters B, 2022 In Chain Inflation the universe tunnels along a series of false vacua of ever-decreasing energy. The main goal of this paper is to embed Chain Inflation in high energy fundamental physics.
Katherine Freese +2 more
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