Article
Astronomy & Astrophysics
Antonio De Felice, Shinji Mukohyama
Summary: This paper introduces a new cosmological framework integrating dark matter into a minimally modified gravity model, maintaining the same number of gravitational degrees of freedom through a series of transformations. The framework includes two time-dependent free functions to achieve desired evolutions of Hubble expansion rate and effective gravitational constant for dark matter.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Daniele Oriti, Xiankai Pang
Summary: The analysis of emergent cosmological dynamics in mean field hydrodynamics of quantum gravity condensates reveals accelerated expansion of the universe at both early and late times. Although it does not support a compelling inflationary scenario in the early universe, it naturally produces a phantom-like dark energy dynamics at late times, which crosses the phantom divide and avoids any Big Rip singularity, approaching a de Sitter universe asymptotically.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Yuewei Wen, Eva Nesbit, Dragan Huterer, Scott Watson
Summary: Standard cosmological data analyses can't easily determine the presence of modified gravity. This study presents a quantitative mapping showing how modified gravity models appear within standard analyses, reporting specific biases in standard-parameter spaces. The implications for measurements of mass fluctuations are also discussed.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Stavros Mougiakakos, Pierre Vanhove
Summary: The study derives the static Schwarzschild-Tangherlini metric by extracting classical contributions from the multiloop vertex functions of a graviton emitted from a massive scalar field. By computing scattering amplitudes, an expansion of the metric up to the fourth post-Minkowskian order in four, five, and six dimensions is explicitly derived, with the introduction of higher-derivative nonminimal couplings to cancel ultraviolet divergences. The standard Schwarzschild-Tangherlini metric is recovered through an appropriate coordinate transformation induced from the de Donder gauge condition.
Article
Astronomy & Astrophysics
Alexander Ganz
Summary: Minimally modified gravity models use auxiliary constraints to maintain a dynamic cosmological background, with results of linear perturbations being insensitive to constraint details, leading to a modified effective gravitational constant or a non-zero dust sound speed.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Denis Comelli, Maicol Di Giambattista, Luigi Pilo
Summary: Gyroscopic systems in classical and quantum field theory are characterized by the presence of scalar degrees of freedom and terms that mix fields and their time derivatives. These systems can arise from the coupling among fields with time-dependent and space-dependent vacuum expectation values, and can exhibit stability in certain parameter spaces.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Hooman Davoudiasl, Peter B. Denton, David A. McGady
Summary: The conventional lore excludes fermionic dark matter with mass lighter than a few hundred electronvolts based on the Pauli exclusion principle. A new method is proposed in this paper which involves numerous quasi-degenerate species of fermions without couplings to the standard model to evade this bound. Gravitational interactions impose constraints from measurements at the LHC, cosmic rays, supernovae, and black hole spins and lifetimes, with a particular limit on the number of distinct species of particles being less than or around 10^62.
Article
Physics, Mathematical
Daniel Harlow, Hirosi Ooguri
Summary: This paper refines and establishes a set of old conjectures about symmetries in quantum gravity using the AdS/CFT correspondence. It shows the absence of bulk global symmetries in AdS/CFT and discusses how long-range bulk gauge symmetries lead to global boundary symmetries. The results are extended to higher-form symmetries and the weak gravity conjecture is applied to more general gauge groups.
COMMUNICATIONS IN MATHEMATICAL PHYSICS
(2021)
Article
Physics, Multidisciplinary
Ahmad Sheykhi, Maral Sahebi Hamedan
Summary: The thermodynamics-gravity conjecture suggests a strong connection between the gravitational field equations and the first law of thermodynamics, meaning any changes in entropy expression directly impact the field equations. By considering the modified Barrow entropy associated with the apparent horizon, the Friedmann equations are altered as well. This paper explores the implications of this modification on the holographic dark energy (HDE) model, highlighting changes in energy density and the Friedmann equations. The study also investigates the cosmological consequences of using the Hubble horizon and future event horizon as infrared cutoffs, including interactions between dark matter (DM) and dark energy (DE), and the impact of the Barrow exponent on the cosmological behavior of HDE, such as crossing the phantom line and shifting the universe phase transition time.
Article
Astronomy & Astrophysics
Mohammad Ali Gorji, Hayato Motohashi, Shinji Mukohyama
Summary: In the context of scalar-tensor theories, stealth de Sitter solutions face issues of infinite strong coupling or gradient instability, which can be resolved by introducing a controlled detuning mechanism known as scordatura. This mechanism not only resolves the mentioned issues, but also ensures a well-defined quasi-static limit.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Multidisciplinary Sciences
Cosmin Andrei, Anna Ijjas, Paul J. Steinhardt
Summary: In this paper, we investigate how short the remaining period of expansion can be given current observational constraints on dark energy, and discuss how this scenario fits naturally with cyclic cosmologies and recent conjectures about quantum gravity.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Astronomy & Astrophysics
Andreas Lymperis
Summary: By investigating the features of a non-metricity scalar Q function, the cosmological implications of f(Q) gravity are explored, and analytical expressions for the dark energy density, equation-of-state, and deceleration parameters are obtained. The study reveals that even in the absence of a cosmological constant, the universe follows the usual thermal history with matter and dark energy eras, and the dark energy equation-of-state parameter remains in the phantom regime. Additionally, the scenario shows excellent agreement with observational data from Supernovae type Ia. Furthermore, it is demonstrated that f(Q) gravity can effectively mimic the behavior of a cosmological constant.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Chunshan Lin
Summary: This study presents a general covariant local field theory of the holographic dark energy model, showing that the low energy effective theory is the massive gravity theory with a scalar graviton having strong coupling at certain energy scale. The UV-IR correspondence in this model stems from the breakdown of the effective field theory at the energy scale.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Multidisciplinary Sciences
Herbert W. Hamber, Lu Heng Sunny Yu
Summary: The passage discusses the perturbative nature of gravity theory, the use of the Hartree-Fock approximation for quantum gravity, and the resulting self-consistent integral equations for graviton self-energy. The nonlinear equations for graviton self-energy in the Hartree-Fock approximation show distinct features compared to scalar and gauge theory cases, revealing a nontrivial ultraviolet fixed point and scaling dimensions in certain spacetime dimensions. Additionally, the Hartree-Fock approximation provides an explicit analytic expression for the renormalization group running of Newton's constant, suggesting gravitational antiscreening behavior.
Article
Physics, Particles & Fields
Martin Luescher, Peter Weisz
Summary: The renormalization of the topological charge density in dimensionally regularized QCD only requires an additive renormalization proportional to the divergence of the flavour-singlet axial current, as shown through BRS analysis and the use of Stora-Zumino chain of descent equations.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Heliudson Bernardo, Renato Costa, Horatiu Nastase, Amanda Weltman
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Review
Astronomy & Astrophysics
Leor Barack, Vitor Cardoso, Samaya Nissanke, Thomas P. Sotiriou, Abbas Askar, Chris Belczynski, Gianfranco Bertone, Edi Bon, Diego Blas, Richard Brito, Tomasz Bulik, Clare Burrage, Christian T. Byrnes, Chiara Caprini, Masha Chernyakova, Piotr Chrusciel, Monica Colpi, Valeria Ferrari, Daniele Gaggero, Jonathan Gair, Juan Garcia-Bellido, S. F. Hassan, Lavinia Heisenberg, Martin Hendry, Ik Siong Heng, Carlos Herdeiro, Tanja Hinderer, Assaf Horesh, Bradley J. Kavanagh, Bence Kocsis, Michael Kramer, Alexandre Le Tiec, Chiara Mingarelli, Germano Nardini, Gijs Nelemans, Carlos Palenzuela, Paolo Pani, Albino Perego, Edward K. Porter, Elena M. Rossi, Patricia Schmidt, Alberto Sesana, Ulrich Sperhake, Antonio Stamerra, Leo C. Stein, Nicola Tamanini, Thomas M. Tauris, L. Arturo Urena-Lopez, Frederic Vincent, Marta Volonteri, Barry Wardell, Norbert Wex, Kent Yagi, Tiziano Abdelsalhin, Miguel Angel Aloy, Pau Amaro-Seoane, Lorenzo Annulli, Manuel Arca-Sedda, Ibrahima Bah, Enrico Barausse, Elvis Barakovic, Robert Benkel, Charles L. Bennett, Laura Bernard, Sebastiano Bernuzzi, Christopher P. L. Berry, Emanuele Berti, Miguel Bezares, Jose Juan Blanco-Pillado, Jose Luis Blazquez-Salcedo, Matteo Bonetti, Mateja Boskovic, Zeljka Bosnjak, Katja Bricman, Bernd Bruegmann, Pedro R. Capelo, Sante Carloni, Pablo Cerda-Duran, Christos Charmousis, Sylvain Chaty, Aurora Clerici, Andrew Coates, Marta Colleoni, Lucas G. Collodel, Geoffrey Compere, William Cook, Isabel Cordero-Carrion, Miguel Correia, Alvaro de la Cruz-Dombriz, Viktor G. Czinner, Kyriakos Destounis, Kostas Dialektopoulos, Daniela Doneva, Massimo Dotti, Amelia Drew, Christopher Eckner, James Edholm, Roberto Emparan, Recai Erdem, Miguel Ferreira, Pedro G. Ferreira, Andrew Finch, Jose A. Font, Nicola Franchini, Kwinten Fransen, Dmitry Gal'tsov, Apratim Ganguly, Davide Gerosa, Kostas Glampedakis, Andreja Gomboc, Ariel Goobar, Leonardo Gualtieri, Eduardo Guendelman, Francesco Haardt, Troels Harmark, Filip Hejda, Thomas Hertog, Seth Hopper, Sascha Husa, Nada Ihanec, Taishi Ikeda, Amruta Jaodand, Philippe Jetzer, Xisco Jimenez-Forteza, Marc Kamionkowski, David E. Kaplan, Stelios Kazantzidis, Masashi Kimura, Shiho Kobayashi, Kostas Kokkotas, Julian Krolik, Jutta Kunz, Claus Laemmerzahl, Paul Lasky, Jose P. S. Lemos, Jackson Levi Said, Stefano Liberati, Jorge Lopes, Raimon Luna, Yin-Zhe Ma, Elisa Maggio, Alberto Mangiagli, Marina Martinez Montero, Andrea Maselli, Lucio Mayer, Anupam Mazumdar, Christopher Messenger, Brice Menard, Masato Minamitsuji, Christopher J. Moore, David Mota, Sourabh Nampalliwar, Andrea Nerozzi, David Nichols, Emil Nissimov, Martin Obergaulinger, Niels A. Obers, Roberto Oliveri, George Pappas, Vedad Pasic, Hiranya Peiris, Tanja Petrushevska, Denis Pollney, Geraint Pratten, Nemanja Rakic, Istvan Racz, Miren Radia, Fethi M. Ramazanoglu, Antoni Ramos-Buades, Guilherme Raposo, Marek Rogatko, Roxana Rosca-Mead, Dorota Rosinska, Stephan Rosswog, Ester Ruiz-Morales, Mairi Sakellariadou, Nicolas Sanchis-Gual, Om Sharan Salafia, Anuradha Samajdar, Alicia Sintes, Majda Smole, Carlos Sopuerta, Rafael Souza-Lima, Marko Stalevski, Nikolaos Stergioulas, Chris Stevens, Tomas Tamfal, Alejandro Torres-Forne, Sergey Tsygankov, Kivanc I. Unluturk, Rosa Valiante, Maarten van de Meent, Jose Velhinho, Yosef Verbin, Bert Vercnocke, Daniele Vernieri, Rodrigo Vicente, Vincenzo Vitagliano, Amanda Weltman, Bernard Whiting, Andrew Williamson, Helvi Witek, Aneta Wojnar, Kadri Yakut, Haopeng Yan, Stoycho Yazadjiev, Gabrijela Zaharijas, Miguel Zilhao
CLASSICAL AND QUANTUM GRAVITY
(2019)
Article
Astronomy & Astrophysics
E. Armengaud, D. Attie, S. Basso, P. Brun, N. Bykovskiy, J. M. Carmona, J. F. Castel, S. Cebrian, M. Cicoli, M. Civitani, C. Cogollos, J. P. Conlon, D. Costa, T. Dafni, R. Daido, A. Derbin, M. A. Descalle, K. Desch, I. S. Dratchnev, B. Doebrich, A. Dudarev, E. Ferrer-Ribas, I Fleck, J. Galan, G. Galanti, L. Garrido, D. Gascon, L. Gastaldo, C. Germani, G. Ghisellini, M. Giannotti, I Giomataris, S. Gninenko, N. Golubev, R. Graciani, I. G. Irastorza, K. Jakovcic, J. Kaminski, M. Krcmar, C. Krieger, B. Lakic, T. Lasserre, P. Laurent, O. Limousin, A. Lindner, I Lomskaya, B. Lubsandorzhiev, G. Luzon, M. C. D. Marsh, C. Mergalejo, F. Mescia, M. Meyer, J. Miralda-Escude, H. Mirallas, V. N. Muratova, X. F. Navick, C. Nones, A. Notari, A. Nozik, A. Ortiz de Solorzano, V Pantuev, T. Papaevangelou, G. Pareschi, K. Perez, E. Picatoste, M. J. Pivovaroff, J. Redondo, A. Ringwald, M. Roncadelli, E. Ruiz-Choliz, J. Ruz, K. Saikawa, J. Salvado, M. P. Samperiz, T. Schiffer, S. Schmidt, U. Schneekloth, M. Schott, H. Silva, G. Tagliaferri, F. Takahashi, F. Tavecchio, H. ten Kate, I Tkachev, S. Troitsky, E. Unzhakov, P. Vedrine, J. K. Vogel, C. Weinsheimer, A. Weltman, W. Yin
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Review
Physics, Multidisciplinary
E. Platts, A. Weltman, A. Walters, S. P. Tendulkar, J. E. B. Gordin, S. Kandhai
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2019)
Article
Astronomy & Astrophysics
Lucia Fonseca de la Bella, Donough Regan, David Seery, David Parkinson
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Physics, Particles & Fields
A. Abeln, K. Altenmuller, S. Arguedas Cuendis, E. Armengaud, D. Attie, S. Aune, S. Basso, L. Berge, B. Biasuzzi, P. T. C. Borges De Sousa, P. Brun, N. Bykovskiy, D. Calvet, J. M. Carmona, J. F. Castel, S. Cebrian, V. Chernov, F. E. Christensen, M. M. Civitani, C. Cogollos, T. Dafni, A. Derbin, K. Desch, D. Diez, M. Dinter, B. Dobrich, I. Drachnev, A. Dudarev, L. Dumoulin, D. D. M. Ferreira, E. Ferrer-Ribas, I. Fleck, J. Galan, D. Gascon, L. Gastaldo, M. Giannotti, Y. Giomataris, A. Giuliani, S. Gninenko, J. Golm, N. Golubev, L. Hagge, J. Hahn, C. J. Hailey, D. Hengstler, P. L. Henriksen, T. Houdy, R. Iglesias-Marzoa, F. J. Iguaz, I. G. Irastorza, C. Iniguez, K. Jakovcic, J. Kaminski, B. Kanoute, S. Karstensen, L. Kravchuk, B. Lakic, T. Lasserre, P. Laurent, O. Limousin, A. Lindner, M. Loidl, I. Lomskaya, G. Lopez-Alegre, B. Lubsandorzhiev, K. Ludwig, G. Luzon, C. Malbrunot, C. Margalejo, A. Marin-Franch, S. Marnieros, F. Marutzky, J. Mauricio, Y. Menesguen, M. Mentink, S. Mertens, F. Mescia, J. Miralda-Escude, H. Mirallas, J. P. Mols, V. Muratova, X. F. Navick, C. Nones, A. Notari, A. Nozik, L. Obis, C. Oriol, F. Orsini, A. Ortiz de Solorzano, S. Oster, H. P. Pais Da Silva, V. Pantuev, T. Papaevangelou, G. Pareschi, K. Perez, O. Perez, E. Picatoste, M. J. Pivovaroff, D. V. Poda, J. Redondo, A. Ringwald, M. Rodrigues, F. Rueda-Teruel, S. Rueda-Teruel, E. Ruiz-Choliz, J. Ruz, E. O. Saemann, J. Salvado, T. Schiffer, S. Schmidt, U. Schneekloth, M. Schott, L. Segui, F. Tavecchio, H. H. J. ten Kate, I. Tkachev, S. Troitsky, D. Unger, E. Unzhakov, N. Ushakov, J. K. Vogel, D. Voronin, A. Weltman, U. Werthenbach, W. Wuensch, A. Yanes-Diaz
Summary: BabyIAXO is an intermediate experimental stage of the International Axion Observatory (IAXO), designed to test all subsystems of IAXO and serve as a prototype, while also functioning as a fully-fledged helioscope with potential for discovery. The magnet of BabyIAXO will have two 10 m long, 70 cm diameter bores and two detection lines of dimensions similar to those planned for IAXO. BabyIAXO will detect or reject solar axions or ALPs with axion-photon couplings down to g(a gamma) similar to 1.5 x 10(-11) GeV-1 and masses up to m(a) similar to 0.25 eV.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Michaela G. Lawrence, David Seery, Christian T. Byrnes
Summary: The study explores a disformal coupling between Standard Model matter and a cubic Galileon scalar sector, which evades strict constraints from the integrated Sachs-Wolfe effect. Despite the presence of a cosmological 'screening-like' phenomenon, the disformal coupling is too weak to be constrained by recent events such as GW170817 or by the dispersion of electromagnetic radiation at different wavelengths.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Kareem Marzouk, Alessandro Maraio, David Seery
Summary: In this study, we update predictions for observables in the "delicate" D3/(D3) over bar inflationary model on the conifold. Our analysis shows that the model can accurately forecast the amplitude of three-point correlations. The model generally follows Maldacena's single-field prediction, but in some cases, the bispectrum is dominated by effects from rapid switching between angular minima, resulting in larger amplitudes but with unacceptable spectral behavior.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Surajit Kalita, Amanda Weltman
Summary: Since the discovery of FRBs, researchers have proposed different theories and models to explain them. One recent model incorporates the Gertsenshtein-Zel'dovich effect, which suggests that gravitational waves can be transformed into electromagnetic radiation when passing through a pulsar magnetosphere. The properties of FRBs are consistent with this electromagnetic radiation, indicating that the GZ effect can account for both repeating and non-repeating FRBs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Surajit Kalita, Shruti Bhatporia, Amanda Weltman
Summary: In recent decades, numerous modifications to general relativity have been proposed to address cosmological and astrophysical issues. While many modified gravity models have been ruled out, some theories remain viable albeit with parameters constrained by observations. Fast Radio Bursts have proven to be powerful tools for constraining cosmology and fundamental physics. This study examines the implications of a generic modified gravity theory on gravitational lensing using Fast Radio Bursts, and utilizes observations to constrain the fraction of dark matter composed of primordial black holes. Additionally, it demonstrates that modified gravity produces a screening effect on gravitational lensing akin to the presence of plasma acting as a scattering screen.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Michaela G. Lawrence, David Seery
Summary: This study revisits the sequester proposal, evaluates different formulations, and finds a particular class of quantum corrections to be important. In formulations that do not adequately sequester graviton loops, dressing of interactions leads to further failures of complete sequestration, but the effect is typically smaller than the cosmological term induced by single virtual graviton loops. In the most developed scenario, dressing can be absorbed into a resealing of rigid fields, making it harmless.
Review
Astronomy & Astrophysics
A. Weltman, P. Bull, S. Camera, K. Kelley, H. Padmanabhan, J. Pritchard, A. Raccanelli, S. Riemer-Sorensen, L. Shao, S. Andrianomena, E. Athanassoula, D. Bacon, R. Barkana, G. Bertone, C. Boehm, C. Bonvin, A. Bosma, M. Brueggen, C. Burigana, F. Calore, J. A. R. Cembranos, C. Clarkson, R. M. T. Connors, A. de la Cruz-Dombriz, P. K. S. Dunsby, J. Fonseca, N. Fornengo, D. Gaggero, I Harrison, J. Larena, Y-Z Ma, R. Maartens, M. Mendez-Isla, S. D. Mohanty, S. Murray, D. Parkinson, A. Pourtsidou, P. J. Quinn, M. Regis, P. Saha, M. Sahlen, M. Sakellariadou, J. Silk, T. Trombetti, F. Vazza, T. Venumadhav, F. Vidotto, F. Villaescusa-Navarro, Y. Wang, C. Weniger, L. Wolz, F. Zhang, B. M. Gaensler
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2020)
Article
Astronomy & Astrophysics
Anthony Walters, Yin-Zhe Ma, Jonathan Sievers, Amanda Weltman
Article
Astronomy & Astrophysics
Clare Burrage, Edmund J. Copeland, Christian Kading, Peter Millington
Article
Astronomy & Astrophysics
Robert Brandenberger, Renato Costa, Guilherme Franzmann, Amanda Weltman
