Article
Physics, Particles & Fields
Borna Salehian, Hong-Yi Zhang, Mustafa A. Amin, David Kaiser, Mohammad Hossein Namjoo
Summary: This paper systematically derives the SP equations and relativistic corrections from the nonlinear and fully relativistic KGE equations in an expanding universe, providing insights into deviations and applicability beyond the SP system. The method presented simplifies the analysis of scalar dark matter dynamics and accurately captures deviations from the SP system towards the full KGE case, particularly in calculating the mass-radius relationship of solitons.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Amjad Ashoorioon, Abasalt Rostami, Javad T. Firouzjaee
Summary: This paper presents a mechanism for enhancing the power spectrum during inflation, based on the observation that if the quartic coefficient in the dispersion relation is negative, the amplitude of the power spectrum is substantially enhanced. The mechanism must kick in at scales related to the mass of the PBHs one would like to produce, and it can be applied to produce solar mass PBHs or to contribute to the dark matter energy density.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Guillermo Ballesteros, Sebastian Cespedes, Luca Santoni
Summary: This paper studies the mechanisms for generating a large power spectrum within the effective theory of single-field inflation, which is necessary for the formation of primordial black holes. The mechanisms considered include a transition into a ghost-inflation-like phase and scenarios where an exponentially growing mode is temporarily turned on. The enhancement in the power spectrum results from either a swift change in some effective coupling or a modification of the dispersion relation for the perturbations, while the background evolution remains unchanged and approximately de Sitter throughout inflation. The weakly broken galileon symmetry guarantees the robustness of the results.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Juan Carlos Criado, Abdelhak Djouadi, Manuel Perez-Victoria, Jose Santiago
Summary: This paper presents an effective field theory describing the interactions between the Standard Model and dark matter candidates. The framework includes non-redundant basis of gauge-invariant operators up to dimension six, allowing for a general description of the interactions. Specific examples illustrate the phenomenological use of this framework, highlighting the importance of non-renormalizable operators in certain cases.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Fabiola Fortuna, Pablo Roig, Jose Wudka
Summary: In this study, interactions between dark matter and standard model particles with spin one mediators are analyzed within an effective field theory framework. Solutions corresponding to operators with antisymmetric tensor mediators that meet various experimental constraints are obtained.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Simone Biondini, Vladyslav Shtabovenko
Summary: This paper aims to study the non-relativistic limit of Yukawa interactions between heavy Dirac fermions and a scalar field, using modern effective field theory techniques not previously explored. The motivation for the study lies in explaining cosmological observations by introducing heavy fermionic dark matter particles that interact with each other through exchanging a light scalar mediator. The main novelty of this approach is the systematic study of this scenario within the framework of non-relativistic effective field theories.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Jens O. Andersen, Magdalena Eriksson, Anders Tranberg
Summary: This paragraph discusses the non-linear dynamics of long-wavelength cosmological fluctuations, which can be described by an effective classical and stochastic evolution equation. The stochastic noise represents short-wavelength modes that continuously redshift into long-wavelength dynamics, and the amplitude of the evolution equation determines the cosmological correlations.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Andrew J. Tolley, Zi-Yue Wang, Shuang-Yong Zhou
Summary: Positivity bounds derived from partial wave expansion and full crossing symmetry can constrain effective field theories by putting upper and lower bounds on Wilson coefficients. These bounds are more constraining than linear positivity for scalars and can be used to exclude theories with soft amplitude behavior.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Arushi Bodas, Soubhik Kumar, Raman Sundrum
Summary: Non-analyticity in co-moving momenta within the non-Gaussian bispectrum is a distinctive sign of on-shell particle production during inflation. A combination of dimension-5 derivative couplings and chemical potential form operator provides an exception to the usual exponential drop in non-analyticity at masses exceeding the inflationary Hubble scale. This mechanism allows for the direct detection of particles with masses potentially as high as 10^(15) GeV, within the sensitivity of upcoming experiments.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Dayshon Mathis, Alexandros Mousatov, George Panagopoulos, Eva Silverstein
Summary: This study introduces a new mechanism for inflation that imposes a speed limit on scalar motion, leading to accelerated expansion even on a steep potential. This speed limit is achieved by explicitly integrating out the short modes of additional fields coupled to the inflaton phi via a dimension six operator, resulting in an effective action that includes a nontrivial logarithmic function of (partial derivative phi)(2). The observational constraints on the parameters of this model are also discussed.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Fuminobu Takahashi, Masaki Yamada, Wen Yin
Summary: The recent excess observed in the electron recoil data of XENON1T can be explained by anomaly-free axion-like particle (ALP) dark matter, which may have played a role in driving inflation in the early universe. The study suggests successful reheating after inflation requires ALP couplings to heavy fermions, followed by an entropy dilution of O(10) achieved through decays of right-handed neutrinos to explain the XENON1T excess.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Yi-Peng Wu, Elena Pinetti, Kalliopi Petraki, Joseph Silk
Summary: In ultra-slow-roll inflation models, a sharp transition in the inflationary background can trigger coherent motion of scalar condensates carrying baryon or lepton number. This can lead to successful baryogenesis from unconventional initial conditions, shedding light on the cosmic coincidence problem.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Giovanni Cabass, Enrico Pajer, David Stefanyszyn, Jakub Supel
Summary: By using gravitational interferometers and cosmological observations, we can investigate the laws of gravity in the early universe. To study and interpret the data, it is important to understand the possible non-Gaussianities of gravitons. In this study, the authors derive the most general tree-level expressions for the three-point functions of massless gravitons, assuming scale invariance.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Zi-Yue Wang, Cen Zhang, Shuang-Yong Zhou
Summary: By utilizing generalized elastic positivity bounds, we constrained the parameter space of multi-field spin-2 effective field theories, excluding certain operators in the pseudo-linear theory and providing new bounds on Wilson coefficients in the cycle and line theories.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
James Bonifacio, Enrico Pajer, Dong-Gang Wang
Summary: Our understanding of quantum correlators in cosmological spacetimes, including those observed in cosmological surveys, has significantly improved in recent years, leading to the derivation of the most general scalar four-point correlator and the extension of the cosmological bootstrap. By applying techniques from commutative algebra, we have been able to derive these results without assuming Lorentz boosts invariance, further building a new connection between flat and curved spacetime physics.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Yi-Peng Wu
Article
Physics, Particles & Fields
Chao-Qiang Geng, Chung-Chi Lee, Yi-Peng Wu
EUROPEAN PHYSICAL JOURNAL C
(2017)
Article
Astronomy & Astrophysics
Yi-Peng Wu, Jun'ichi Yokoyama
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Astronomy & Astrophysics
Chao-Qiang Geng, Yi-Peng Wu
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2013)
Article
Astronomy & Astrophysics
Yi Wang, Yi-Peng Wu, Jun'ichi Yokoyama, Siyi Zhou
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Astronomy & Astrophysics
Jung-Tsung Li, Yi-Peng Wu, Chao-Qiang Geng
Article
Astronomy & Astrophysics
Teruaki Suyama, Yi-Peng Wu, Jun'ichi Yokoyama
Article
Physics, Particles & Fields
Yi-Peng Wu, Louis Yang, Alexander Kusenko
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Astronomy & Astrophysics
Yi-Peng Wu, Kalliopi Petraki
Summary: By using a multi-field stochastic approach, this study examines the vacuum expectation value during inflation and suggests a mechanism for baryogenesis, concluding that the charged scalar mass at the order of H-* is favored by the isocurvature constraints at a Hubble scale of 10^13 GeV.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Yi-Peng Wu
PHYSICS OF THE DARK UNIVERSE
(2020)
Article
Physics, Multidisciplinary
Yi-Peng Wu, Elena Pinetti, Joseph Silk
Summary: If primordial black holes contribute more than 10% of the dark matter density, their energy density could be of the same order as baryons, suggesting a mutual origin. Baryogenesis can be triggered by a sharp transition in the rolling rate of inflaton, leading to large curvature perturbations for the formation of primordial black holes in single-field inflationary models. This requirement leads to potentially observable regimes for the contribution of primordial black holes to dark matter, the inferred mass range, the stochastic gravitational wave background frequency window, and the amplitude of the associated cosmic microwave background tensor-to-scalar ratio.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Particles & Fields
Kin-Wang Ng, Yi-Peng Wu
Summary: The study focuses on the impact of constant-rate inflation on the formation of primordial black holes, deriving analytic solutions for curvature perturbations related to conformal weights and emphasizing the continuity of conformal weights between different rolling phases protected by the adiabatic condition of the inflaton perturbation. The temporal excitation of subleading states triggering the steepest growth of the power spectrum is attributed to entropy production in the transition from slow-roll to constant-rate phases.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Yi-Peng Wu, Elena Pinetti, Kalliopi Petraki, Joseph Silk
Summary: In ultra-slow-roll inflation models, a sharp transition in the inflationary background can trigger coherent motion of scalar condensates carrying baryon or lepton number. This can lead to successful baryogenesis from unconventional initial conditions, shedding light on the cosmic coincidence problem.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Naritaka Oshita, Yi-Peng Wu