23 Citations
Efficient self-resonance instability from axions
- PhysicsJournal of Cosmology and Astroparticle Physics
- 2019
It was recently shown that a coherent oscillation of an axion can cause an efficient parametric resonance, leading to a prominent emission of the gravitational waves (GWs). In this paper, conducting…
Perturbation approach to the Hill equation with a slowly varying parameter with application to the inflationary cosmology
- MathematicsJournal of Mathematical Physics
- 2018
We develop a general perturbative approach to solving the Hill equation with a slowly varying parameter based on the Floquet theory and asymptotic expansions in the vicinity of the exact solutions…
Cosmic bubble and domain wall instabilities I: parametric amplification of linear fluctuations
- Physics
- 2014
This is the first paper in a series where we study collisions of nucleated bubbles taking into account the effects of small initial (quantum) fluctuations in a fully 3+1-dimensional setting. In this…
Inflaton fragmentation and oscillon formation in three dimensions
- Physics
- 2010
Analytical arguments suggest that a large class of scalar field potentials permit the existence of oscillons — pseudo-stable, non-topological solitons — in three spatial dimensions. In this paper we…
Inflaton Fragmentation and Oscillon Formation in Three Dimensions
- Physics
- 2010
Analytical arguments suggest that a large class of scalar field potentials permit the existence of oscillons -- pseudo-stable, non-topological solitons -- in three spatial dimensions. In this paper…
Preheating in derivatively coupled inflation models
- Physics
- 2008
We study preheating in theories where the inflaton couples derivatively to scalar and gauge fields. Such couplings may dominate in, for example, models of natural inflation, in which the flatness of…
Can axion clumps be formed in a pre-inflationary scenario?
- PhysicsJournal of Cosmology and Astroparticle Physics
- 2021
The QCD axion and an axion-like particle (ALP) are compelling candidates of dark matter. For the QCD axion, it is known that when the Peccei-Quinn (PQ) symmetry is spontaneously broken after…
Decay rates of Gaussian-type I-balls and Bose-enhancement effects in 3+1 dimensions
- Physics
- 2014
I-balls/oscillons are long-lived spatially localized lumps of a scalar field which may be formed after inflation. In the scalar field theory with monomial potential nearly and shallower than…
Localized modes in a variety of driven long Josephson junctions with phase shifts
- Physics
- 2018
We study both analytically and numerically the localized modes in long Josephson junctions with phase shift formations, so-called $$0{-}\pi {-}0$$0-π-0 and $$0{-}\kappa $$0-κ junctions. The system is…
References
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Towards the theory of reheating after inflation
- Physics
- 1997
Reheating after inflation occurs due to particle production by the oscillating inflaton field. In this paper we describe the perturbative approach to reheating, and then concentrate on effects beyond…
Nonlinear axion dynamics and the formation of cosmological pseudosolitons.
- PhysicsPhysical review. D, Particles and fields
- 1994
It is found that axion perturbations on scales corresponding to causally disconnected regions at [ital T][similar to]1 GeV can lead to very dense pseudosoliton configurations the authors call axitons, which evolve to axion miniclusters with a present density high enough to lead to Bose-Einstein relaxation in the gravitationally bound clumps of axions, forming Bose stars.
Resonance Structure for Preheating with Massless Fields
- Physics
- 1998
We extend recent work on the resonance structure for post-inflation reheating, providing an analytic treatment for models in which both the inflaton and the fields into which it decays are massless.…
Natural inflation with pseudo Nambu-Goldstone bosons.
- PhysicsPhysical review letters
- 1990
We show that a pseudo-Nambu-Goldstone boson, with a potential of the form V(d) = A’[1 f cos(+/f)], can naturally give rise to an epoch of infiation in the early universe. Successful inflation can be…
Structure of resonance in preheating after inflation
- Mathematics, Physics
- 1997
We consider preheating in the theory $1/4 \lambda \phi^4 + 1/2 g^2\phi^2\chi^2 $, where the classical oscillating inflaton field $\phi$ decays into $\chi$-particles and $\phi$-particles. The…
String radiative backreaction.
- PhysicsPhysical review letters
- 1995
It is shown how local corrections to the equations of motion allow one to separate the self-field of the string from that of the radiation field, circumvent the runaway solutions.
Calculation of particle production by Nambu-Goldstone bosons with application to inflation reheating and baryogenesis.
- PhysicsPhysical review. D, Particles and fields
- 1995
It is argued that the resonance probably disappears when the expansion of the Universe is included and an idea for baryogenesis in inflation are mentioned.
The early Universe
- Physics, EducationNature
- 1981
In the past few years one of the most exciting areas of research in physics has been the interdisciplinary field of cosmology and particle physics. The NSF's Institute for Theoretical Physics in…
Axion miniclusters and Bose stars.
- Physics, Materials SciencePhysical review letters
- 1993
It is found that perturbations on scales corresponding to causally disconnected regions at T T GeV can lead to very dense axion clumps, with present density high enough for the collisional 2a\ensuremath{\rightarrow}2a process to lead to Bose-Einstein relaxation in the gravitationally bound clumps of axions, forming Bose stars.