173 citations · 1.5k across the 23 of their papers we have counts for
23 papers
On Cosmological Correlators with Boundary Contributions
Yanjiao Ma, Dong-Gang Wang, Xiangwei Wang +2
Cosmological correlators receive contributions from both field interactions in the bulk of quasi-de Sitter (dS) spacetime and boundary terms at the end of inflation. While most of…
Searching for Cosmological Collider in the Planck CMB Data
Wuhyun Sohn, Dong-Gang Wang, James R. Fergusson +1
In this paper, we present the first comprehensive CMB data analysis of cosmological collider physics. New heavy particles during inflation can leave imprints in the primordial corr…
On the IR Divergences in de Sitter Space: loops, resummation and the semi-classical wavefunction
Sebastián Céspedes, Anne-Christine Davis, Dong-Gang Wang
In this paper, we revisit the infrared (IR) divergences in de Sitter (dS) space using the wavefunction method, and explicitly explore how the resummation of higher-order loops lead…
Bootstrapping Multi-Field Inflation: non-Gaussianities from light scalars revisited
Dong-Gang Wang, Guilherme L. Pimentel, Ana Achúcarro
Primordial non-Gaussianities from multi-field inflation are a leading target for cosmological observations, because of the possible large correlations generated between long and sh…
Highly non-Gaussian tails and primordial black holes from single-field inflation
Yi-Fu Cai, Xiao-Han Ma, Misao Sasaki +2
For primordial perturbations, deviations from Gaussian statistics on the tail of the probability distribution can be associated with non-perturbative effects of inflation. In this…
Boostless Cosmological Collider Bootstrap
Guilherme L. Pimentel, Dong-Gang Wang
Cosmological correlation functions contain valuable information about the primordial Universe, with possible signatures of new massive particles at very high energies. Recent devel…
One Small Step for an Inflaton, One Giant Leap for Inflation: a novel non-Gaussian tail and primordial black holes
Yi-Fu Cai, Xiao-Han Ma, Misao Sasaki +2
We report a novel prediction from single-field inflation that even a tiny step in the inflaton potential can change our perception of primordial non-Gaussianities of the curvature…
From Amplitudes to Contact Cosmological Correlators
James Bonifacio, Enrico Pajer, Dong-Gang Wang
Our understanding of quantum correlators in cosmological spacetimes, including those that we can observe in cosmological surveys, has improved qualitatively in the past few years.…
Multi-field inflation and preheating in asymmetric -attractors
Oksana Iarygina, Evangelos I. Sfakianakis, Dong-Gang Wang +1
We analyze and compare the multi-field dynamics during inflation and preheating in symmetric and asymmetric models of -attractors, characterized by a hyperbolic field-space mani…
On the inflationary massive field with a curved field manifold
Dong-Gang Wang
Massive fields during inflation provide an interesting opportunity to test new physics at very high energy scales. Meanwhile in fundamental realizations, the inflationary field spa…
When Primordial Black Holes from Sound Speed Resonance Meet a Stochastic Background of Gravitational Waves
Yi-Fu Cai, Chao Chen, Xi Tong +2
As potential candidates of dark matter, primordial black holes (PBHs) are within the core scopes of various astronomical observations. In light of the explosive development of grav…
Shift-Symmetric Orbital Inflation: single field or multi-field?
Ana Achúcarro, Edmund J. Copeland, Oksana Iarygina +3
We present a new class of two-field inflationary attractor models, known as `shift-symmetric orbital inflation', whose behaviour is strongly multi-field but whose predictions are r…
Universality and scaling in multi-field -attractor preheating
Oksana Iarygina, Evangelos I. Sfakianakis, Dong-Gang Wang +1
We explore preheating in multi-field models of inflation in which the field-space metric is a highly curved hyperbolic manifold. One broad family of such models is called -attra…
Primordial Black Holes from Sound Speed Resonance during Inflation
Yi-Fu Cai, Xi Tong, Dong-Gang Wang +1
We report on a novel phenomenon of the resonance effect of primordial density perturbations arisen from a sound speed parameter with an oscillatory behavior, which can generically…
Hypernatural inflation
Andrei Linde, Dong-Gang Wang, Yvette Welling +2
We constructed a model of natural inflation in the context of -attractor supergravity, in which both the dilaton field and the axion field are light during inflation, and the in…
Revisiting non-Gaussianity from non-attractor inflation models
Yi-Fu Cai, Xingang Chen, Mohammad Hossein Namjoo +3
Non-attractor inflation is known as the only single field inflationary scenario that can violate non-Gaussianity consistency relation with the Bunch-Davies vacuum state and generat…
Universality of multi-field -attractors
Ana Achúcarro, Renata Kallosh, Andrei Linde +2
We study a particular version of the theory of cosmological -attractors with , in which both the dilaton (inflaton) field and the axion field are light during inflation.…
Matter bounce cosmology with a generalized single field: non-Gaussianity and an extended no-go theorem
Yu-Bin Li, Jerome Quintin, Dong-Gang Wang +1
We extend the matter bounce scenario to a more general theory in which the background dynamics and cosmological perturbations are generated by a -essence scalar field with an ar…
Bouncing cosmologies with dark matter and dark energy
Yi-Fu Cai, Antonino Marciano, Dong-Gang Wang +1
We review matter bounce scenarios where the matter content is dark matter and dark energy. These cosmologies predict a nearly scale-invariant power spectrum with a slightly red til…
Features from the non-attractor beginning of inflation
Yi-Fu Cai, Jinn-Ouk Gong, Dong-Gang Wang +1
We study the effects of the non-attractor initial conditions for the canonical single-field inflation. The non-attractor stage can last only several -folding numbers, and should…
Hearing the echoes of electroweak baryogenesis with gravitational wave detectors
Fa Peng Huang, Youping Wan, Dong-Gang Wang +2
We report on the first joint analysis of observational signatures from the electroweak baryogenesis in both gravitational wave (GW) detectors and particle colliders. With an effect…
Searching for a matter bounce cosmology with low redshift observations
Yi-Fu Cai, Francis Duplessis, Damien A. Easson +1
The matter bounce scenario allows for a sizable parameter space where cosmological fluctuations originally exited the Hubble radius when the background energy density was small. In…
Vacuum and Gravitons of Relic Gravitational Waves, and Regularization of Spectrum and Energy-Momentum Tensor
Dong-Gang Wang, Yang Zhang, Jie-Wen Chen
The spectrum of relic gravitational wave (RGW) contains high-frequency divergences, which should be removed. We present a systematic study of the issue, based on the exact RGW solu…