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Explaining Pulsar Timing Array Observations with Primordial Gravitational Waves in Parity-Violating Gravity

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arxiv 2308.15329 v3 pith:NY2SKPRF submitted 2023-08-29 astro-ph.CO gr-qc

Chengjie Fu , Jing Liu , Xing-Yu Yang , Wang-Wei Yu , Yawen Zhang This is my paper · ORCID
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keywords gravitybackgroundgravitationalinflationaryobservationspgwsarraymodel
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The pulsar timing array (PTA) collaborations have recently suggested the presence of a gravitational wave background at nano-Hertz frequencies. In this paper, we explore potential inflationary interpretation of this signal within the context of a simple and health parity-violating gravity model termed the Nieh-Yan modified Teleparallel Gravity. Through this model, two inflationary scenarios are evaluated, both yielding significant polarized primordial gravitational waves (PGWs) that align well with the results from PTA observations. Furthermore, the resulting PGWs can display strong circular polarization and significant anisotropies in the PTA frequency band, which are distinct features to be verified by observations of both PTA and the cosmic microwave background.The detection of such a distinctive background of PGWs is expected to provide strong evidence supporting our scenarios and insights into inflationary dynamics and gravity theory.

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Cited by 3 Pith papers

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  1. Fixed-Time Voltage Regulation for Boost Converters via Unit-Safe Saturating Functions

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    A fixed-time feedback controller for boost converters uses a new class of saturating functions, observers, and adaptive gains to regulate output voltage within a bounded settling time under unknown load resistance.

  2. Tensor induced gravitational waves

    astro-ph.CO 2025-07 conditional novelty 4.0 of 10

    Second-order tensor-induced gravitational waves can shift the inferred parameters of small-scale primordial gravitational wave models fitted to NANOGrav 15-year data, with one model favored by Bayes factors.

  3. Cosmological constraints on small-scale primordial non-Gaussianity

    astro-ph.CO 2025-05 conditional novelty 4.0 of 10

    Current pulsar-timing, CMB, BAO and PBH data constrain the small-scale local f_NL to -10.0 < f_NL < 1.2 for a monochromatic primordial power spectrum, with that constraint conditional on the spectral amplitude A_zeta = 10^-2.

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