Larger H0 values in the CMB dipole direction

Luongo O. Muccino M. Colgáin E.Ó. Sheikh-Jabbari M.M. Yin L.
15 May 2022 American Physical Society

Physical Review D
2022 #105 Issue 10

Based on the assumption that quasars (QSOs) and gamma-ray bursts (GRBs) represent standardizable candles, we provide evidence that the Hubble constant H0 adopts larger values in hemispheres aligned with the cosmic microwave background (CMB) dipole direction. If substantiated, this trend signals a departure from Friedmann-Lemaître-Robertson-Walker cosmology. In particular, QSOs show a definite trend, whereas our findings in GRBs are consistent with an isotropic universe, but we show in a sample of GRBs calibrated with type Ia supernovae (SNe) that this conclusion may change as one focuses on GRBs more closely (mis)aligned with the CMB dipole direction. The statistical significance in QSOs alone is 2σ, and when combined with similar trends in strong lensing, type Ia SNe, and calibrated GRBs, this increases to ∼3σ. Our findings are consistent with reported discrepancies in the cosmic dipole and anisotropies in galaxy cluster scaling relations. The reported variations in H0 across the sky suggest that Hubble tension may be a symptom of a deeper cosmological malaise.

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Dipartimento di Matematica, Università di Pisa, Largo B. Pontecorvo 5, Pisa, 56127, Italy
Divisione di Fisica, Università di Camerino, Via Madonna delle Carceri, 9, 62032, Italy
Al-Farabi Kazakh National University, Al-Farabi av. 71, Almaty, 050040, Kazakhstan
National Nanotechnology Laboratory of Open Type, Almaty, 050040, Kazakhstan
Istituto Nazionale di Fisica Nucleare (INFN), Laboratori Nazionali di Frascati, Frascati, 00044, Italy
Center for Quantum Spacetime, Sogang University, Seoul, 121-742, South Korea
Department of Physics, Sogang University, Seoul, 121-742, South Korea
School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O.Box 19395-5531, Tehran, Iran

Dipartimento di Matematica
Divisione di Fisica
Al-Farabi Kazakh National University
National Nanotechnology Laboratory of Open Type
Istituto Nazionale di Fisica Nucleare (INFN)
Center for Quantum Spacetime
Department of Physics
School of Physics

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