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The $\Lambda$CDM model provides a good fit to a large span of cosmological data but harbors areas of phenomenology. With the improvement of the number and the accuracy of observations, discrepancies among key cosmological parameters of the…

Cosmology and Nongalactic Astrophysics · Physics 2021-07-14 Eleonora Di Valentino , Olga Mena , Supriya Pan , Luca Visinelli , Weiqiang Yang , Alessandro Melchiorri , David F. Mota , Adam G. Riess , Joseph Silk

We investigate an extended cosmological model motivated by the asymptotic safety of gravitational field theory, in which the matter and radiation densities and the cosmological constant receive a correction parametrized by the parameters…

Cosmology and Nongalactic Astrophysics · Physics 2021-07-07 Li-Yang Gao , Ze-Wei Zhao , She-Sheng Xue , Xin Zhang

With the emersion of precise cosmology and the emergence of cosmic tensions, we are faced with the question of whether the simple model of cold dark matter needs to be extended and whether doing so can alleviate the tensions and improve our…

High Energy Physics - Phenomenology · Physics 2023-07-18 Parisa Arabameri , Zahra Davari , Nima Khosravi

The values of the Hubble constant ($\rm{H_0}$) inferred from the cosmic microwave background (CMB) and local measurements via the distance ladder exhibit a $\sim5\sigma$ tension. In this work we propose that the tension might be partially…

Cosmology and Nongalactic Astrophysics · Physics 2026-02-12 Zachary J. Hoelscher , Thomas W. Kephart , Robert J. Scherrer , Kelly Holley-Bockelmann

We analyzed T-violation in neutrino oscillation by using perturbation methods with respect to $\Delta m_{21}^2L/2E$ and $\delta a(x)L/2E$, where $\delta a(x)$ represents the matter density fluctuation from its average value. We found that…

High Energy Physics - Phenomenology · Physics 2009-11-07 Takahiro Miura , Eiichi Takasugi , Yoshitaka Kuno , Masaki Yoshimura

We study the matter effect caused by nonstandard neutrino interactions (NSI) in the next generation long-baseline neutrino experiments, DUNE, T2HK and T2HKK. If multiple NSI parameters are nonzero, the potential of these experiments to…

High Energy Physics - Phenomenology · Physics 2017-01-20 Jiajun Liao , Danny Marfatia , Kerry Whisnant

We present a three-flavour fit to the recent \nu\mu --> \nu e and \nu\mu --> \nu\mu T2K oscillation data with different models for the neutrino-nucleus cross section. We show that, even for a limited statistics, the allowed regions and best…

High Energy Physics - Phenomenology · Physics 2015-06-04 D. Meloni , M. Martini

Dark photons coupling to $L_\mu-L_\tau$ lepton number difference are a highly studied light dark matter candidate, with potential to be discovered through their impact on terrestrial neutrino oscillation experiments. We re-examine this in…

High Energy Physics - Phenomenology · Physics 2025-06-12 Gonzalo Alonso-Álvarez , James M. Cline , Benoit Laurent , Ushak Rahaman

A potential solution to the Hubble tension is the hypothesis that the Milky Way is located near the center of a matter underdensity. We model this scenario through the Lema\^itre-Tolman-Bondi formalism with the inclusion of a cosmological…

Cosmology and Nongalactic Astrophysics · Physics 2022-07-07 Sveva Castello , Marcus Högås , Edvard Mörtsell

We study the earth matter effects in the Tokai-to-Kamioka-and-Korea experiment (T2KK), which is a proposed extension of the T2K (Tokai-to-Kamioka) neutrino oscillation experiment between J-PARC at Tokai and Super-Kamiokande (SK) in Kamioka,…

High Energy Physics - Phenomenology · Physics 2015-05-30 Kaoru Hagiwara , Naotoshi Okamura , Ken-ichi Senda

The T2K Experiment has observed the appearance of electron neutrinos in a muon-neutrino beam. Twenty eight neutrino candidates pass the selection cuts with a predicted background of $4.64 \pm 0.53$ events, which corresponds to a 6.8$\sigma$…

High Energy Physics - Experiment · Physics 2019-08-14 Michael Wilking

Tokai-to-Kamioka T2K is a long baseline neutrino oscillation experiment, looking for sub-dominant muon neutrino to electron neutrino oscillations. One of the primary aims of the T2K experiment is to narrow down the current limit on the…

High Energy Physics - Experiment · Physics 2010-06-08 Melissa George

We review the status of the neutrino oscillation physics (as of June 2003), with a particular emphasis on the present knowledge of the neutrino mass-mixing parameters in a three generation approach. We consider first the nu_mu-->nu_tau…

High Energy Physics - Phenomenology · Physics 2009-11-10 G. L. Fogli , E. Lisi , A. Marrone , D. Montanino , A. Palazzo , A. M. Rotunno

Cold New Early Dark Energy (Cold NEDE) addresses the Hubble tension through a triggered vacuum phase transition in the dark sector. In this paper, we constrain a phenomenological fluid model using recent cosmic microwave background…

Cosmology and Nongalactic Astrophysics · Physics 2025-01-16 Aleksandr Chatrchyan , Florian Niedermann , Vivian Poulin , Martin S. Sloth

Here we study the pattern of neutrino oscillations emerging from a previously proposed warped model construction incorporating $\Delta(27)$ flavor symmetry. In addition to a complete description of fermion masses, the model predicts the…

High Energy Physics - Phenomenology · Physics 2017-06-07 Pedro Pasquini , S. C. Chuliá , J. W. F. Valle

The T2K long-baseline neutrino-oscillation experiment accumulated approximately 11.0x10^20 POT (protons on target) data until June 2015. The results of \nu_e appearance as well as \nu_\mu disappearance for 6.57x10^20 POT neutrino beam data…

High Energy Physics - Experiment · Physics 2016-09-07 Yuichi Oyama

The T2K experiment is a long-baseline accelerator neutrino experiment using a near detector complex ND280 and a far detector, Super-Kamiokande. Neutrino interactions are detected by Cherenkov light in Super-Kamiokande in order to measure…

High Energy Physics - Experiment · Physics 2019-08-14 L. Haegel

As observations of the Hubble parameter from both early and late sources have improved, the tension between these has increased to be well above the 5$\sigma$ threshold. Given this, the need for an explanation of such a tension has grown.…

Cosmology and Nongalactic Astrophysics · Physics 2021-02-04 Wim Beenakker , David Venhoek

We examine the validity of the $\Lambda$CDM model, and probe for the dynamics of dark energy using latest astronomical observations. Using the $Om(z)$ diagnosis, we find that different kinds of observational data are in tension within the…

Cosmology and Nongalactic Astrophysics · Physics 2017-06-14 Yuecheng Zhang , Hanyu Zhang , Dandan Wang , Yanghan Qi , Yuting Wang , Gong-Bo Zhao

We introduce a theoretical framework to interpret the Hubble tension, based on the combination of a metric $f(R)$ gravity with a dynamical dark energy contribution. The modified gravity provides the non-minimally coupled scalar field…

General Relativity and Quantum Cosmology · Physics 2023-11-07 Giovanni Montani , Mariaveronica De Angelis , Flavio Bombacigno , Nakia Carlevaro
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