Article
Astronomy & Astrophysics
Damiano Anselmi
Summary: This study investigates primordial cosmology with two scalar fields participating in inflation, revealing the existence of an asymptotically de Sitter cosmic RG flow in two couplings. The importance of quantum gravity theory's predictiveness and the role of RG invariance are highlighted.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Luca Marchetti, Daniele Oriti
Summary: This research derives effective dynamics for scalar cosmological perturbations from quantum gravity in the framework of group field theory condensate cosmology. It establishes a connection between fundamental quantum gravity models and cosmological observations.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Antonio Najera, Amanda Fajardo
Summary: We developed the cosmological linear theory of perturbations for f(Q, T) gravity and analyzed the coupling between Q and T as well as the properties related to scalar and tensor perturbations. Our analysis suggests that f(Q, T) gravity could serve as a good alternative to dark matter in certain cases, and we provided a method for further studying this theory.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Chong-Bin Chen, Jiro Soda
Summary: This paper studies the effect of the geometry of multi-form field space on an inflationary scenario, clarifies the conditions for the onset of destabilization, reveals the geometric structure of attractors after destabilization, and investigates the features of primordial fluctuations. Several phenomenological predictions are made based on the calculations of the power spectrum.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Damiano Anselmi
Summary: In this study, inflationary perturbation spectra and the quantity r + 8n(T) were computed to the next-to-next-to-leading log order in quantum gravity with solely virtual particles. The spectra are functions of inflationary running coupling and satisfy cosmic renormalization group flow equations. Tensor fluctuations receive contributions from the spin-2 fakeon chi(mu nu), while the scalar spectrum's dependence on chi(mu nu) starts from alpha(2) corrections. The theoretical predictions have errors ranging from alpha(4) to alpha(3), and nontrivial issues regarding the fakeon projection at higher orders are discussed.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Gianluca Calcagni, Sachiko Kuroyanagi
Summary: Among the five cosmological quantum-gravity or quantum-gravity-inspired scenarios explored, only the non-local quantum gravity model is found to be unobservable, while the other models can achieve the strain sensitivity of DECIGO but not that of LIGO-Virgo-KAGRA, LISA or Einstein Telescope. Models with red-tilted spectra or exceptionally tiny quantum corrections are also found to be non-detectable.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Mohammad Ali Gorji
Summary: This paper discusses how the seed of dark matter is generated from light spectator fields during inflation and explains how the energy density of these excited modes dominates the universe's energy density during the time of matter and radiation equality, playing the role of dark matter.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Cem Eroncel, Geraldine Servant
Summary: We demonstrate the formation of very compact axion mini-clusters through the kinetic misalignment mechanism in axion-like-particle (ALP) dark matter models. These mini-clusters are denser than those formed through standard misalignment or large misalignment scenarios. Our analysis shows that adiabatic fluctuations play a significant role in the amplification of ALP fluctuations in the early universe, leading to larger final sizes in the kinetic misalignment mechanism. We compare the halo mass functions and spectra obtained from different misalignment scenarios and present the results in terms of the ALP mass and decay constant.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Arunoday Sarkar, Chitrak Sarkar, Buddhadeb Ghosh
Summary: By defining the k-modes of quantum fluctuations during inflation through the dynamical horizon crossing condition k = aH, and solving the equations of cosmological first-order perturbations self-consistently with chaotic alpha-attractor type potentials, we were able to study the behavior of various parameters in k-space. Comparison with Planck data in the low-k regime constrained the values of the alpha parameter through microscopic calculations. The calculated results matched the Planck-2018 data with 68% or near 95% CL for various values of alpha.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Harry Goodhew, Sadra Jazayeri, Mang Hei Gordon Lee, Enrico Pajer
Summary: This paper discusses the initial conditions of the universe and the impact of quantum mechanics on late-time observables, deriving a set of single-cut rules, discussing the analytical structure of the wave function, and verifying the applicability of these rules in some specific examples.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Dong-Gang Wang, Guilherme L. Pimentel, Ana Achucarro
Summary: Primordial non-Gaussianities from multi-field inflation are studied in this paper, with a focus on the nonlinear conversion process from additional light scalars into curvature perturbations. Analytic templates for correlation functions at any kinematical configuration are provided using the cosmological bootstrap. The results include the possibility of large breaking of boost symmetry and small speeds of sound for both the inflaton and the mediators. The symmetry constraints on the correlators are found to be modified by introducing a late-time cutoff, leading to anomalous conformal Ward identities.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Mingzhe Li, Dehao Zhao
Summary: This paper explores the cosmological applications and features of cosmological perturbations in parity violating models based on symmetric teleparallel gravity. It reveals that in addition to the known parity violation in tensor perturbations, vector perturbations in this model exhibit unique characteristics, with one mode behaving as a ghost at high momentum scales, leading to vacuum instability in the quantum theory of cosmological perturbations.
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
Gabriela Barenboim, Nikita Blinov, Albert Stebbins
Summary: The study suggests that the evolution of the universe before Big Bang Nucleosynthesis may have experienced an early phase of matter domination, leading to the growth of dark matter structures. Contrary to the assumptions of standard cosmology, the formation of dark matter structures occurs earlier than expected, with most dark matter being bound in microhalos.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Damiano Anselmi
Summary: The study investigates the running of power spectra in inflationary cosmology by reformulating the slow roll expansion. The calculation of spectral indices, runnings, and related quantities to the next-to-leading log order reveals their universal relation to spectra. Additionally, quantum gravity predictions are provided for potential future testing.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Editorial Material
Astronomy & Astrophysics
Enrico Barausse, Emanuele Berti, Thomas Hertog, Scott A. Hughes, Philippe Jetzer, Paolo Pani, Thomas P. Sotiriou, Nicola Tamanini, Helvi Witek, Kent Yagi, Nicolas Yunes, T. Abdelsalhin, A. Achucarro, K. van Aelst, N. Afshordi, S. Akcay, L. Annulli, K. G. Arun, I. Ayuso, V. Baibhav, T. Baker, H. Bantilan, T. Barreiro, C. Barrera-Hinojosa, N. Bartolo, D. Baumann, E. Belgacem, E. Bellini, N. Bellomo, I. Ben-Dayan, I. Bena, R. Benkel, E. Bergshoefs, L. Bernard, S. Bernuzzi, D. Bertacca, M. Besancon, F. Beutler, F. Beyer, S. Bhagwat, J. Bicak, S. Biondini, S. Bize, D. Blas, C. Boehmer, K. Boller, B. Bonga, C. Bonvin, P. Bosso, G. Bozzola, P. Brax, M. Breitbach, R. Brito, M. Bruni, B. Bruegmann, H. Bulten, A. Buonanno, L. M. Burko, C. Burrage, F. Cabral, G. Calcagni, C. Caprini, A. Cardenas-Avendano, M. Celoria, K. Chatziioannou, D. Chernoff, K. Clough, A. Coates, D. Comelli, G. Compere, D. Croon, D. Cruces, G. Cusin, C. Dalang, U. Danielsson, S. Das, S. Datta, J. de Boer, V. De Luca, C. De Rham, V. Desjacques, K. Destounis, F. Di Filippo, A. Dima, E. Dimastrogiovanni, S. Dolan, D. Doneva, F. Duque, R. Durrer, W. East, R. Easther, M. Elley, J. R. Ellis, R. Emparan, J. M. Ezquiaga, M. Fairbairn, S. Fairhurst, H. F. Farmer, M. R. Fasiello, V. Ferrari, P. G. Ferreira, G. Ficarra, P. Figueras, S. Fisenko, S. Foffa, N. Franchini, G. Franciolini, K. Fransen, J. Frauendiener, N. Frusciante, R. Fujita, J. Gair, A. Ganz, P. Garcia, J. Garcia-Bellido, J. Garriga, R. Geiger, C. Geng, L. a. Gergely, C. Germani, D. Gerosa, S. B. Giddings, E. Gourgoulhon, P. Grandclement, L. Graziani, L. Gualtieri, D. Haggard, S. Haino, R. Halburd, W. -B. Han, A. J. Hawken, A. Hees, I. S. Heng, J. Hennig, C. Herdeiro, S. Hervik, J. v. Holten, C. D. Hoyle, Y. Hu, M. Hull, T. Ikeda, M. Isi, A. Jenkins, F. Julie, E. Kajfasz, C. Kalaghatgi, N. Kaloper, M. Kamionkowski, V. Karas, S. Kastha, Z. Keresztes, L. Kidder, T. Kimpson, A. Klein, S. Klioner, K. Kokkotas, H. Kolesova, S. Kolkowitz, J. Kopp, K. Koyama, N. V. Krishnendu, J. A. V. Kroon, M. Kunz, O. Lahav, A. Landragin, R. N. Lang, C. Le Poncin-Lafitte, J. Lemos, B. Li, S. Liberati, M. Liguori, F. Lin, G. Liu, F. S. N. Lobo, R. Loll, L. Lombriser, G. Lovelace, R. P. Macedo, E. Madge, E. Maggio, M. Maggiore, S. Marassi, P. Marcoccia, C. Markakis, W. Martens, K. Martinovic, C. J. A. P. Martins, A. Maselli, S. Mastrogiovanni, S. Matarrese, A. Matas, N. E. Mavromatos, A. Mazumdar, P. D. Meerburg, E. Megias, J. Miller, J. P. Mimoso, L. Mittnacht, M. M. Montero, B. Moore, P. Martin-Moruno, I. Musco, H. Nakano, S. Nampalliwar, G. Nardini, A. Nielsen, J. Novak, N. J. Nunes, M. Okounkova, R. Oliveri, F. Oppizzi, G. Orlando, N. Oshita, G. Pappas, V. Paschalidis, H. Peiris, M. Peloso, S. Perkins, V. Pettorino, I. Pikovski, L. Pilo, J. Podolsky, A. Pontzen, S. Prabhat, G. Pratten, T. Prokopec, M. Prouza, H. Qi, A. Raccanelli, A. Rajantie, L. Randall, G. Raposo, V. Raymond, S. Renaux-Petel, A. Ricciardone, A. Riotto, T. Robson, D. Roest, R. Rollo, S. Rosofsky, J. J. Ruan, D. Rubiera-Garcia, M. Ruiz, M. Rusu, F. Sabatie, N. Sago, M. Sakellariadou, I. D. Saltas, L. Sberna, B. Sathyaprakash, M. Scheel, P. Schmidt, B. Schutz, P. Schwaller, L. Shao, S. L. Shapiro, D. Shoemaker, A. d. Silva, C. Simpson, C. F. Sopuerta, A. Spallicci, B. A. Stefanek, L. Stein, N. Stergioulas, M. Stott, P. Sutton, R. Svarc, H. Tagoshi, T. Tahamtan, H. Takeda, T. Tanaka, G. Tantilian, G. Tasinato, O. Tattersall, S. Teukolsky, A. L. Tiec, G. Theureau, M. Trodden, A. Tolley, A. Toubiana, D. Traykova, A. Tsokaros, C. Unal, C. S. Unnikrishnan, E. C. Vagenas, P. Valageas, M. Vallisneri, J. Van den Brand, C. Van den Broeck, M. van de Meent, P. Vanhove, V. Varma, J. Veitch, B. Vercnocke, L. Verde, D. Vernieri, F. Vernizzi, R. Vicente, F. Vidotto, M. Visser, Z. Vlah, S. Vretinaris, S. Voelkel, Q. Wang, Yu-Tong Wang, M. C. Werner, J. Westernacher, R. v. d. Weygaert, D. Wiltshire, T. Wiseman, P. Wolf, K. Wu, K. Yamada, H. Yang, L. Yi, X. Yue, D. Yvon, M. Zilhao, A. Zimmerman, M. Zumalacarregui
GENERAL RELATIVITY AND GRAVITATION
(2020)
Article
Astronomy & Astrophysics
Gianluca Calcagni, Sachiko Kuroyanagi
Summary: Among the five cosmological quantum-gravity or quantum-gravity-inspired scenarios explored, only the non-local quantum gravity model is found to be unobservable, while the other models can achieve the strain sensitivity of DECIGO but not that of LIGO-Virgo-KAGRA, LISA or Einstein Telescope. Models with red-tilted spectra or exceptionally tiny quantum corrections are also found to be non-detectable.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Review
Astronomy & Astrophysics
Gianluca Calcagni
Summary: The review discusses the current status of multifractional theories, providing comparative tables for theoretical foundations, classical matter and gravity dynamics, cosmology, and experimental constraints. The application of the multifractional paradigm to quantum gravity is examined, along with clarification of unitarity in theories with integer-order derivatives.
MODERN PHYSICS LETTERS A
(2021)
Article
Astronomy & Astrophysics
Gianluca Calcagni
Summary: We studied a class of perturbative scalar quantum field theories characterized by specific operators; some of them are ghost free, some are power-counting renormalizable, but cannot be both; for some of these theories, one-loop calculations result in unitary and finite theories, potentially valid at all orders.
CLASSICAL AND QUANTUM GRAVITY
(2021)
Correction
Astronomy & Astrophysics
Gianluca Calcagni
CLASSICAL AND QUANTUM GRAVITY
(2021)
Article
Astronomy & Astrophysics
Gianluca Calcagni
Summary: In this work, a class of perturbative theories of quantum gravity based on fractional operators is proposed, with the construction of classical actions and derivation of equations of motion for each theory. The study shows that unitarity and power-counting renormalizability do not coexist in these theories, although one-loop unitarity and finiteness are possible in some cases. One of the theories is found to be unitary and infrared-finite, serving as a ghost-free model with large-scale modifications of general relativity.
CLASSICAL AND QUANTUM GRAVITY
(2021)
Review
Physics, Nuclear
A. Addazi, J. Alvarez-Muniz, R. Alves Batista, G. Amelino-Camelia, V Antonelli, M. Arzano, M. Asorey, J-L Atteia, S. Bahamonde, F. Bajardi, A. Ballesteros, B. Baret, D. M. Barreiros, S. Basilakos, D. Benisty, O. Birnholtz, J. J. Blanco-Pillado, D. Blas, J. Bolmont, D. Boncioli, P. Bosso, G. Calcagni, S. Capozziello, J. M. Carmona, S. Cerci, M. Chernyakova, S. Clesse, J. A. B. Coelho, S. M. Colak, J. L. Cortes, S. Das, V D'Esposito, M. Demirci, M. G. Di Luca, A. di Matteo, D. Dimitrijevic, G. Djordjevic, D. Dominis Prester, A. Eichhorn, J. Ellis, C. Escamilla-Rivera, G. Fabiano, S. A. Franchino-Vinas, A. M. Frassino, D. Frattulillo, S. Funk, A. Fuster, J. Gamboa, A. Gent, L. A. Gergely, M. Giammarchi, K. Giesel, J-F Glicenstein, J. Gracia-Bondia, R. Gracia-Ruiz, G. Gubitosi, E. Guendelman, I Gutierrez-Sagredo, L. Haegel, S. Heefer, A. Held, F. J. Herranz, T. Hinderer, J. I. Illana, A. Ioannisian, P. Jetzer, F. R. Joaquim, K-H Kampert, A. Karasu Uysal, T. Katori, N. Kazarian, D. Kerszberg, J. Kowalski-Glikman, S. Kuroyanagi, C. Lammerzahl, J. Levi Said, S. Liberati, E. Lim, I. P. Lobo, M. Lopez-Moya, G. G. Luciano, M. Manganaro, A. Marciano, P. Martin-Moruno, Manel Martinez, Mario Martinez, H. Martinez-Huerta, P. Martinez-Mirave, M. Masip, D. Mattingly, N. Mavromatos, A. Mazumdar, F. Mendez, F. Mercati, S. Micanovic, J. Mielczarek, A. L. Miller, M. Milosevic, D. Minic, L. Miramonti, V. A. Mitsou, P. Moniz, S. Mukherjee, G. Nardini, S. Navas, M. Niechciol, A. B. Nielsen, N. A. Obers, F. Oikonomou, D. Oriti, C. F. Paganini, S. Palomares-Ruiz, R. Pasechnik, V Pasic, C. Perez de los Heros, C. Pfeifer, M. Pieroni, T. Piran, A. Platania, S. Rastgoo, J. J. Relancio, M. A. Reyes, A. Ricciardone, M. Risse, M. D. Rodriguez Frias, G. Rosati, D. Rubiera-Garcia, H. Sahlmann, M. Sakellariadou, F. Salamida, E. N. Saridakis, P. Satunin, M. Schiffer, F. Schussler, G. Sigl, J. Sitarek, J. Sola Peracaula, C. F. Sopuerta, T. P. Sotiriou, M. Spurio, D. Staicova, N. Stergioulas, S. Stoica, J. Striskovic, T. Stuttard, D. Sunar Cerci, Y. Tavakoli, C. A. Ternes, T. Terzic, T. Thiemann, P. Tinyakov, M. D. C. Torri, M. Tortola, C. Trimarelli, T. Trzesniewski, A. Tureanu, F. R. Urban, E. C. Vagenas, D. Vernieri, V. Vitagliano, J-C Wallet, J. D. Zornoza
Summary: The exploration of the universe has entered a new era with the multi-messenger paradigm, providing us with more information about the universe and opening up the possibility of searching for quantum gravity phenomena.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2022)
Article
Physics, Particles & Fields
Leonardo Modesto, Gianluca Calcagni
Summary: In this study, it is demonstrated that a special class of nonlocal field theories exhibit consistency with linear and non-linear stability at the classical level, as well as unitarity and super-renormalizability or finiteness at the quantum level. Specifically, the n-point tree-level scattering amplitudes of these nonlocal theories are shown to be equivalent to those of the underlying local theory, including nonlocal gravity which matches Einstein's general relativity.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Tessa Baker, Gianluca Calcagni, Anson Chen, Matteo Fasiello, Lucas Lombriser, Katarina Martinovic, Mauro Pieroni, Mairi Sakellariadou, Gianmassimo Tasinato, Daniele Bertacca, Ippocratis D. Saltas
Summary: The possibility of transient deviations of the propagation speed of gravitational waves from the speed of light at low frequencies, based on modifications of General Relativity, is discussed. The impact of these deviations on the gravitational waveforms of black hole binary mergers detectable by the LISA mission is studied. Constraints on these deviations obtainable from individual systems and a population of sources are forecasted.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Review
Physics, Particles & Fields
K. G. Arun, Enis Belgacem, Robert Benkel, Laura Bernard, Emanuele Berti, Gianfranco Bertone, Marc Besancon, Diego Blas, Christian G. Bohmer, Richard Brito, Gianluca Calcagni, Alejandro Cardenas-Avendano, Katy Clough, Marco Crisostomi, Valerio De Luca, Daniela Doneva, Stephanie Escoffier, Jose Maria Ezquiaga, Pedro G. Ferreira, Pierre Fleury, Stefano Foffa, Gabriele Franciolini, Noemi Frusciante, Juan Garcia-Bellido, Carlos Herdeiro, Thomas Hertog, Tanja Hinderer, Philippe Jetzer, Lucas Lombriser, Elisa Maggio, Michele Maggiore, Michele Mancarella, Andrea Maselli, Sourabh Nampalliwar, David Nichols, Maria Okounkova, Paolo Pani, Vasileios Paschalidis, Alvise Raccanelli, Lisa Randall, Sebastien Renaux-Petel, Antonio Riotto, Milton Ruiz, Alexander Saffer, Mairi Sakellariadou, Ippocratis D. Saltas, B. S. Sathyaprakash, Lijing Shao, Carlos F. Sopuerta, Thomas P. Sotiriou, Nikolaos Stergioulas, Nicola Tamanini, Filippo Vernizzi, Helvi Witek, Kinwah Wu, Kent Yagi, Stoytcho Yazadjiev, Nicolas Yunes, Miguel Zilhao, Niayesh Afshordi, Marie-Christine Angonin, Vishal Baibhav, Enrico Barausse, Tiago Barreiro, Nicola Bartolo, Nicola Bellomo, Ido Ben-Dayan, Eric A. Bergshoeff, Sebastiano Bernuzzi, Daniele Bertacca, Swetha Bhagwat, Beatrice Bonga, Lior M. Burko, Geoffrey Compere, Giulia Cusin, Antonio da Silva, Saurya Das, Claudia de Rham, Kyriakos Destounis, Ema Dimastrogiovanni, Francisco Duque, Richard Easther, Hontas Farmer, Matteo Fasiello, Stanislav Fisenko, Kwinten Fransen, Jorg Frauendiener, Jonathan Gair, Laszlo Arpad Gergely, Davide Gerosa, Leonardo Gualtieri, Wen-Biao Han, Aurelien Hees, Thomas Helfer, Jorg Hennig, Alexander C. Jenkins, Eric Kajfasz, Nemanja Kaloper, Vladimir Karas, Bradley J. Kavanagh, Sergei A. Klioner, Savvas M. Koushiappas, Macarena Lagos, Christophe Le Poncin-Lafitte, Francisco S. N. Lobo, Charalampos Markakis, Prado Martin-Moruno, C. J. A. P. Martins, Sabino Matarrese, Daniel R. Mayerson, Jose P. Mimoso, Johannes Noller, Nelson J. Nunes, Roberto Oliveri, Giorgio Orlando, George Pappas, Igor Pikovski, Luigi Pilo, Geraint Pratten, Tomislav Prokopec, Hong Qi, Saeed Rastgoo, Angelo Ricciardone, Rocco Rollo, Diego Rubiera-Garcia, Olga Sergijenko, Stuart Shapiro, Deirdre Shoemaker, Alessandro Spallicci, Oleksandr Stashko, Leo C. Stein, Gianmassimo Tasinato, Andrew J. Tolley, Elias C. Vagenas, Stefan Vandoren, Daniele Vernieri, Rodrigo Vicente, Toby Wiseman, Valery Zhdanov, Miguel Zumalacarregui
Summary: This white paper summarizes the importance of LISA in the field of fundamental physics and discusses future research directions and connections with other working groups.
LIVING REVIEWS IN RELATIVITY
(2022)
Article
Physics, Particles & Fields
Gianluca Calcagni, Gabriele U. Varieschi
Summary: This study explores multi-fractional theories with integer-order derivatives, deriving the Poisson equation and Newtonian potential, with a focus on the behavior of gravitational potential under special values in the T-v theory. The article suggests testing this potential as an alternative to dark matter and discusses methods for further testing the model with other observables and an enlarged galaxy sample.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Psychology, Biological
Maria Jose Labajos, Gianluca Calcagni, Ricardo Pellon
Summary: The study aimed to investigate the potential relationship between drinking in SIP and running in ABA. Findings showed that the initial development of ABA facilitated the subsequent acquisition of SIP, while the first acquisition of SIP retarded the subsequent development of ABA. This suggests functional similarities between running in ABA and drinking in SIP, indicating that both behaviors are induced by the schedule/regime of intermittent food availability.
LEARNING & BEHAVIOR
(2023)
Article
Physics, Particles & Fields
Jiangfan Liu, Leonardo Modesto, Gianluca Calcagni
Summary: In this paper, we demonstrate that general local higher-derivative theories with only complex conjugate ghosts and normal real particles are unitary at any perturbative order in the loop expansion. By integrating the loop energies on complex paths resulting from the deformation of the purely imaginary paths, the proof of unitarity is established. The exclusion of complex ghosts from the spectrum of the theory, as commonly done for Becchi-Rouet-Stora-Tyutin (BRST) ghosts, leads to the unitarity of a specific class of higher-derivative super-renormalizable or finite gravitational and gauge theories at any perturbative order.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Gianluca Calcagni, Antonio De Felice
Article
Psychology, Multidisciplinary
Gianluca Calcagni, Ernesto Caballero-Garrido, Ricardo Pellon
FRONTIERS IN PSYCHOLOGY
(2020)