299 citations · 882 across the 40 of their papers we have counts for
21 papers · 1 filter
Non-Gaussian timing residual skewness in pulsar timing arrays
Reginald Christian Bernardo, Rituparna Mandal, Kin-Wang Ng
Motivated by searches for weak primordial non-Gaussianity in the cosmic microwave background, we investigate perturbative departures from Gaussian stochastic gravitational wave bac…
Correlations for an anisotropic polarized stochastic gravitational wave background in pulsar timing arrays
Reginald Christian Bernardo, Guo-Chin Liu, Kin-Wang Ng
The recent compelling observation of the nanohertz stochastic gravitational wave background has brought to light a new galactic arena to test gravity. In this paper, we derive a fo…
Beyond the Hellings-Downs curve: Non-Einsteinian gravitational waves in pulsar timing array correlations
Reginald Christian Bernardo, Kin-Wang Ng
The recent astronomical milestone by the pulsar timing arrays (PTA) has revealed galactic-size gravitational waves (GW) in the form of a stochastic gravitational wave background (S…
Tadpole Cosmology: Milne Solution as a Cosmological Constant Hideout
Stephen Appleby, Reginald Christian Bernardo
Dynamical cancellation frameworks present a potential means of mitigating the effect of a large vacuum energy, that would otherwise ruin the late-time, low energy dynamics of the U…
Testing gravity with cosmic variance-limited pulsar timing array correlations
Reginald Christian Bernardo, Kin-Wang Ng
The nanohertz stochastic gravitational wave background (SGWB) is an excellent early universe laboratory for testing the fundamental properties of gravity. In this letter, we elucid…
Hunting the stochastic gravitational wave background in pulsar timing array cross correlations through theoretical uncertainty
Reginald Christian Bernardo, Kin-Wang Ng
Incredible progress on the theoretical uncertainty of the spatial correlations of the stochastic gravitational wave (GW) background were recently made. However, it remains to reali…
Constraining gravitational wave propagation using pulsar timing array correlations
Reginald Christian Bernardo, Kin-Wang Ng
Pulsar timing arrays (PTA) are a promising probe to the cosmologically novel nanohertz gravitational wave (GW) regime through the stochastic GW background. In this work, we conside…
Pulsar and cosmic variances of pulsar timing-array correlation measurements of the stochastic gravitational wave background
Reginald Christian Bernardo, Kin-Wang Ng
Pulsar timing-array correlation measurements offer an exciting opportunity to test the nature of gravity in the cosmologically novel nanohertz gravitational wave regime. The stocha…
Stochastic gravitational wave background phenomenology in a pulsar timing array
Reginald Christian Bernardo, Kin-Wang Ng
Pulsar timing offers an independent avenue to test general relativity and alternative gravity theories. This requires an understanding of how metric polarizations beyond the famili…
Quantum and higher curvature corrections to the anti-de Sitter black hole
Kristian Hauser A. Villegas, Reginald Christian Bernardo
Black holes exert quantum pressure coming from the nonlocal gravity correction. We investigate this nonlocal correction for black holes in anti-de Sitter (AdS) spacetime and its du…
Dressed black holes in the new tensor-vector-scalar theory
Reginald Christian Bernardo, Che-Yu Chen
As incarnations of gravity in its prime, black holes are arguably the best target for us to demystify gravity. Keeping in mind the prominent role black holes play in gravitational…
Confronting quantum-corrected teleparallel cosmology with observations
Reginald Christian Bernardo, Che-Yu Chen, Jackson Levi Said +1
It has been shown that at the semi-classical order, gravitational theories with quantum fluctuations can be effectively recast as modified theories of gravity with non-minimal grav…
Inflationary quantum dynamics and backreaction using a classical-quantum correspondence
Reginald Christian Bernardo
We study inflationary dynamics using a recently introduced classical-quantum correspondence for investigating the backreaction of a quantum mechanical degree of freedom to a classi…
Well-Tempered Minkowski Solutions in Teleparallel Horndeski Theory
Reginald Christian Bernardo, Jackson Levi Said, Maria Caruana +1
Well-tempering stands among the few classical methods of screening vacuum energy to deliver a late-time, low energy vacuum state. We build on the class of Horndeski models that adm…
Well-tempered teleparallel Horndeski cosmology: a teleparallel variation to the cosmological constant problem
Reginald Christian Bernardo, Jackson Levi Said, Maria Caruana +1
Well-tempering is a promising classical method of dynamically screening an arbitrarily large vacuum energy and generating a late-time, low energy de Sitter vacuum state. In this pa…
Gravitational wave signatures from dark sector interactions
Reginald Christian Bernardo
We show that the gravitational waves generated by the perturbations of general relativistic black holes can be considered as a direct probe of the existence of dark sector interact…
Self-tuning kinetic gravity braiding: Cosmological dynamics, shift symmetry, and the tadpole
Reginald Christian Bernardo
We study the self-tuning subclass of kinetic gravity braiding and obtain robust predictions on self-tuning and dynamics in the tadpole-free shift symmetric sector of the theory. In…
Stealth black hole perturbations in kinetic gravity braiding
Reginald Christian Bernardo, Ian Vega
We study stealth black hole perturbations in shift symmetric kinetic gravity braiding and obtain its analogous Regge-Wheeler and Zerilli master equations for the odd and even parit…
Stealth black holes in shift symmetric kinetic gravity braiding
Reginald Christian Bernardo, John Celestial, Ian Vega
We derive all hairy stealth black holes in the most general second-order, shift symmetric, scalar-tensor theory with luminally propagating gravitational waves, often called kinetic…
Hair-dressing Horndeski: an approach to hairy solutions in cubic Horndeski gravity
Reginald Christian Bernardo, Ian Vega
In obtaining exact solutions in gravitational theories containing arbitrary model functions, such as Horndeski gravity, one usually starts by prescribing the model functions of the…
Tailoring cosmologies in cubic shift-symmetric Horndeski gravity
Reginald Christian Bernardo, Ian Vega
We present a method for furnishing flat Friedman-Robertson-Walker spacetimes with nearly arbitrary dynamics in an important subclass of cubic Horndeski theory -- specifically shift…