Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Theodoros Papanikolaou"'
Autor:
Theodoros Papanikolaou, Xin-Chen He, Xiao-Han Ma, Yi-Fu Cai, Emmanuel N. Saridakis, Misao Sasaki
Publikováno v:
Physics Letters B, Vol 857, Iss , Pp 138997- (2024)
We propose a new probe of primordial non-Gaussianities (NGs) through the observation of gravitational waves (GWs) induced by ultra-light (MPBH
Externí odkaz:
https://doaj.org/article/4a5309d715cd4d8daf729bcd2e880319
Autor:
Spyros Basilakos, Dimitri V. Nanopoulos, Theodoros Papanikolaou, Emmanuel N. Saridakis, Charalampos Tzerefos
Publikováno v:
Physics Letters B, Vol 850, Iss , Pp 138507- (2024)
In this Letter, we derive for the first time a characteristic three-peaked GW signal within the framework of no-scale Supergravity, being the low-energy limit of Superstring theory. We concentrate on the primordial gravitational wave (GW) spectrum in
Externí odkaz:
https://doaj.org/article/13835aba3b3742b49946aa9e9024c00a
Autor:
Spyros Basilakos, Dimitri V. Nanopoulos, Theodoros Papanikolaou, Emmanuel N. Saridakis, Charalampos Tzerefos
Publikováno v:
Physics Letters B, Vol 849, Iss , Pp 138446- (2024)
The no-scale flipped SU(5) superstring framework constitutes a very promising paradigm for physics below the Planck scale providing us with a very rich cosmological phenomenology in accordance with observations. In particular, it can accommodate Star
Externí odkaz:
https://doaj.org/article/95dbfa0c35814679ac1b33aea546e907
Autor:
Pierre Auclair, David Bacon, Tessa Baker, Tiago Barreiro, Nicola Bartolo, Enis Belgacem, Nicola Bellomo, Ido Ben-Dayan, Daniele Bertacca, Marc Besancon, Jose J. Blanco-Pillado, Diego Blas, Guillaume Boileau, Gianluca Calcagni, Robert Caldwell, Chiara Caprini, Carmelita Carbone, Chia-Feng Chang, Hsin-Yu Chen, Nelson Christensen, Sebastien Clesse, Denis Comelli, Giuseppe Congedo, Carlo Contaldi, Marco Crisostomi, Djuna Croon, Yanou Cui, Giulia Cusin, Daniel Cutting, Charles Dalang, Valerio De Luca, Walter Del Pozzo, Vincent Desjacques, Emanuela Dimastrogiovanni, Glauber C. Dorsch, Jose Maria Ezquiaga, Matteo Fasiello, Daniel G. Figueroa, Raphael Flauger, Gabriele Franciolini, Noemi Frusciante, Jacopo Fumagalli, Juan García-Bellido, Oliver Gould, Daniel Holz, Laura Iacconi, Rajeev Kumar Jain, Alexander C. Jenkins, Ryusuke Jinno, Cristian Joana, Nikolaos Karnesis, Thomas Konstandin, Kazuya Koyama, Jonathan Kozaczuk, Sachiko Kuroyanagi, Danny Laghi, Marek Lewicki, Lucas Lombriser, Eric Madge, Michele Maggiore, Ameek Malhotra, Michele Mancarella, Vuk Mandic, Alberto Mangiagli, Sabino Matarrese, Anupam Mazumdar, Suvodip Mukherjee, Ilia Musco, Germano Nardini, Jose Miguel No, Theodoros Papanikolaou, Marco Peloso, Mauro Pieroni, Luigi Pilo, Alvise Raccanelli, Sébastien Renaux-Petel, Arianna I. Renzini, Angelo Ricciardone, Antonio Riotto, Joseph D. Romano, Rocco Rollo, Alberto Roper Pol, Ester Ruiz Morales, Mairi Sakellariadou, Ippocratis D. Saltas, Marco Scalisi, Kai Schmitz, Pedro Schwaller, Olga Sergijenko, Geraldine Servant, Peera Simakachorn, Lorenzo Sorbo, Lara Sousa, Lorenzo Speri, Danièle A. Steer, Nicola Tamanini, Gianmassimo Tasinato, Jesús Torrado, Caner Unal, Vincent Vennin, Daniele Vernieri, Filippo Vernizzi, Marta Volonteri, Jeremy M. Wachter, David Wands, Lukas T. Witkowski, Miguel Zumalacárregui, James Annis, Fëanor Reuben Ares, Pedro P. Avelino, Anastasios Avgoustidis, Enrico Barausse, Alexander Bonilla, Camille Bonvin, Pasquale Bosso, Matteo Calabrese, Mesut Çalışkan, Jose A. R. Cembranos, Mikael Chala, David Chernoff, Katy Clough, Alexander Criswell, Saurya Das, Antonio da Silva, Pratika Dayal, Valerie Domcke, Ruth Durrer, Richard Easther, Stephanie Escoffier, Sandrine Ferrans, Chris Fryer, Jonathan Gair, Chris Gordon, Martin Hendry, Mark Hindmarsh, Deanna C. Hooper, Eric Kajfasz, Joachim Kopp, Savvas M. Koushiappas, Utkarsh Kumar, Martin Kunz, Macarena Lagos, Marc Lilley, Joanes Lizarraga, Francisco S. N. Lobo, Azadeh Maleknejad, C. J. A. P. Martins, P. Daniel Meerburg, Renate Meyer, José Pedro Mimoso, Savvas Nesseris, Nelson Nunes, Vasilis Oikonomou, Giorgio Orlando, Ogan Özsoy, Fabio Pacucci, Antonella Palmese, Antoine Petiteau, Lucas Pinol, Simon Portegies Zwart, Geraint Pratten, Tomislav Prokopec, John Quenby, Saeed Rastgoo, Diederik Roest, Kari Rummukainen, Carlo Schimd, Aurélia Secroun, Alberto Sesana, Carlos F. Sopuerta, Ismael Tereno, Andrew Tolley, Jon Urrestilla, Elias C. Vagenas, Jorinde van de Vis, Rien van de Weygaert, Barry Wardell, David J. Weir, Graham White, Bogumiła Świeżewska, Valery I. Zhdanov, The LISA Cosmology Working Group
Publikováno v:
Living Reviews in Relativity, Vol 26, Iss 1, Pp 1-254 (2023)
Abstract The Laser Interferometer Space Antenna (LISA) has two scientific objectives of cosmological focus: to probe the expansion rate of the universe, and to understand stochastic gravitational-wave backgrounds and their implications for early univ
Externí odkaz:
https://doaj.org/article/cb0550dff7cf4f0d9707d25befc457fc
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 1, Pp 1-16 (2023)
Abstract Primordial black hole (PBH) fluctuations can induce a stochastic gravitational wave background at second order, and since this procedure is sensitive to the underlying gravitational theory it can be used as a novel tool to test general relat
Externí odkaz:
https://doaj.org/article/6ab76773287141fb87a3748a225fbfb5
Autor:
Theodoros Papanikolaou
Primordial black holes form in the early Universe and constitute one of the most viable candidates for dark matter. The study of their formation process requires the determination of a critical energy density perturbation threshold $\delta_\mathrm{c}
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::610ed624115b6e57ac47b78911ebb8a8
Publikováno v:
Physical Review D. 106
Publikováno v:
Theodoros PAPANIKOLAOU
Primordial black holes (PBHs) can generically form in inflationary setups through the collapse of enhanced cosmological perturbations, providing us access to the early Universe through their associated observational signatures. In the current work we
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9e31cd72acd956ece4644e72d8e64496
http://arxiv.org/abs/2211.14900
http://arxiv.org/abs/2211.14900
Autor:
Ilia Musco, Theodoros Papanikolaou
Publikováno v:
Phys.Rev.D
Phys.Rev.D, 2022, 106 (8), pp.083017. ⟨10.1103/PhysRevD.106.083017⟩
Phys.Rev.D, 2022, 106 (8), pp.083017. ⟨10.1103/PhysRevD.106.083017⟩
This work investigates the formation of primordial black holes within a radiation fluid with an anisotropic pressure. We focus our attention on the initial conditions describing cosmological perturbations in the super horizon regime, using a covarian
Autor:
Theodoros PAPANIKOLAOU
The gravitational potential of initially Poisson distributed primordial black holes (PBH) can induce a stochastic gravitational-wave background (SGWB) at second order in cosmological perturbation theory. This SGWB was previously studied in the contex
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3800e06b2522e429864e3f3a73b7e0d
http://arxiv.org/abs/2207.11041
http://arxiv.org/abs/2207.11041