Acknowledgment to Reviewers of Universe in 2021

Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Universe was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 17 days and the median time to publication was 35 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:

Abbrescia, Marcello	Lepe, Samuel
Abouelmagd, E. I.	Lesur, Maxime
Agarwal, Nishant	Lev, Felix M.
Agathos, Alexander	Li, Bo
Agop, Maricel	Li, Jian
Aguerri, José Alfonso	Li, Xiaocan
Akcay, Sarp	Li, Yufeng
Akhmedov, Emil	Liakos, Alexios
Akiyama, Kazunori	Liang, Shidong
Alessi, Elisa Maria	Licata, Ignazio
Alexeyev, Stanislav	Liegener, Klaus
Alexiou, Spiros	Lin, Chia-Min
Allen, Branden T.	Lin, Guey-Lin
Alonso-Serrano, Ana	Lin, Lap-Ming
Altschul, Brett	Linares, Roberto
Altwegg, Kathrin	Ling, Yi
Alvarez-Castillo, David Edwin	Linhares, César
Alves, Marcio	Link, Jonathan
An, Haipeng	Liu, Fuhu
Anastopoulos, Charis	Liu, N.
Andersen, Thomas	Liu, Xiang
Anguelova, Lilia	Liukkonen, Jukka
Antonelli, Marco	Lobato, Ronaldo
Appleby, Stephen	Lobo, Iarley
Armoni, Adi	Lobo, Iarley Pereira
Arnould, Marcel	Loewe, Marcelo
Aros, Rodrigo	Logoteta, Domenico
Arraut, Ivan	Lombriser, Lucas
Arshakian, Tigran G.	López-Moya, Marcos
Artymowski, Michal	Lovell, Mark
Arvanitakis, Alex S.	Luciano, Giuseppe Gaetano
Arzano, Michele	Lucini, Biagio
Asorey, Jacobo	Lukierski, Jerzy
Aste, Andreas	Luning, Sebastian
Atchison, Justin A.	Luongo, Orlando
Attie, David	Luque-Escamilla, Pedro L.
Avelino, Pedro	Lyakhov, Andrey
Aviles, Alejandro	Lyutikov, Maxim
Awasthi, Arun Kumar	Macedo, Caio
Ayriyan, Alexander	Maeder, Andre
Badziak, Marcin	Magdy, Niseem
Balázs, Heilig	Malek, Emanuel
Baldo, Marcello	Malgieri, Massimiliano
Bamba, Kazuharu	Malkiewicz, Przemyslaw
Barabash, Alexander	Malkov, Oleg
Barak, Liron	Maltseva, O. A.
Barbaro, Maria B.	Malyshev, Denys
Barbero, Fernanado	Mamun, A. A.
Barboza, Edésio Miguel	Marachevsky, Valery
Bargueno, Pedro	Marciano, Antonino
Barnich, Glenn	Margalit, Ben
Barrau, Aurelien	Mariani, Camillo
Bartelmann, Matthias	Marle, Charles-Michel
Batista, Rafael Alves	Marochnik, Leonid
Baù, Giulio	Martello, Daniele
Baum, Sebastian	Martí, Josep
Bazilevskaya, Galina Alexandrovna	Martín, Eduardo L.
Beesham, Aroonkumar	Martín-Albo, Justo
Behunin, Ryan	Martin-Benito, Mercedes
Bellini, Gianpaolo	Martineau, Killian
Beltran Jimenez, Jose	Martino, Ivan De
Benedetti, Dario	Martucci, Matteo
Benetti, Micol	Marziani, Paola
Benkő, József	Marzola, Luca
Beraudo, Andrea	Maslov, Konstantin A.
Berezin, Victor Alexandrovich	Mastrolia, Pierpaolo Mastrolia
Berger, Niklaus	Masullo, Maria Rosaria
Bergeron, Hervé	Mateos Guilarte, Juan
Berton, Marco	Matsuno, Ken
Bettoni, Daniela	Matteo, Armando Di
Bhattacharyya, Trambak	Mattingly, David
Biesiada, Marek	Mavromatos, Nick E.
Bini, Donato	Mavromichalaki, Helen
Bisnovatyi-Kogan, Gennady S.	Mayerson, Daniel R.
Bobomurat, Ahmedov	Mazin, Daniel
Bonanno, Alfio	Mazzitelli, Francisco Diego
Bonatsos, Dennis	McCollough, Michael
Bonometto, Silvio A.	Melkikh, Alexey V.
Bonora, L.	Melnikov, Alexey A.
Bonventre, Richard	Mena-Barboza, Eri A.
Bopp, Fritz W.	Mena-Marugan, Guillermo A.
Bordag, Michael	Menci, Nicola
Borges, Marcelo	Menéndez, Javier
Borisova, T. D.	Mennickent, Ronald
Borka, D.	Meyer, Dominique
Bormashenko, Edward	Meyer, Manuel
Bornyakov, Vitaly	Micol, Benetti
Borowiec, Andrzej	Mielke, Eckehard
Bouwmeester, Dirk	Mignani, Roberto
Brahma, Suddhasattwa	Miković, Aleksandar R.
Branca, Antonio	Millington, Peter
Brandenberger, Robert H.	Milton, Kimball A.
Brandt, Bastian	Mimoso, José P.
Bressan, Alessandro	Minkevich, Albert
Brevik, Iver H.	Miralles, Juan Antonio
Brose, Robert	Miranda, Omar G.
Brugnera, Riccardo	Miscetti, Stefano
Buchert, Stephan C.	Mitchell, Alison
Buchholz, Detlev	Mohr, Peter
Burdin, Sergey	Moniz, Paolo Vargas
Burgdorf, Martin	Moore, Christopher J.
Busso, Maurizio M.	Morikawa, Masahiro
Caceres, Elena	Morlino, Giovanni
Cahay, Marc M.	Morozumi, Takuya
Cai, Qingyu	Moshin, Pavel Yu.
Calloni, Enrico	Mosquera Cuesta, Herman J.
Cander, Ljiljana R.	Moulin, Emmanuel
Cao, Junjie	Mourenas, D.
Cao, Zhen	Moustakidis, Charalampos
Capistrano, Abraao J. S.	Mueck, Wolfgang
Capozziello, Salvatore	Munch, Jesper
Cappelluti, Nico	Mushtukov, Alexander
Cappuzzello, Francesco	Nagasawa, Michiyasu
Cardone, Fabio	Nagirner, Dmitrij I.
Carpano, Stefania	Nakamura, Atsushi
Casadio, Carolina	Nara, Yasushi
Casadio, Roberto	Natário, José
Caso, Loredana	Nathanail, Antonios
Casolino, Marco	Navarro-Salas, Jose
Cassani, Davide	Nedkova, Petya G.
Cattaneo, Paolo W.	Neronov, Andrii
Cavalcanti, Rogerio Teixeira	Neuhäuser, Ralph
Cei, Fabrizio	Neves, J. C. S.
Cella, Giancarlo	Ng, Alfred
Cembranos, Jose A. R.	Nguyen, Ann
Ceriotti, Matteo	Nicastro, Luciano
Cerri, Silvio Sergio	Nicolas, Chamel
Cervantes-Cota, Jorge	Nigro, Cosimo
Cesarini, Andrea	Nikolaevich, Frolov Boris
Chakraborty, Nachiketa	Nikulov, Alexey V.
Char, Prasanta	Nishikawa, Ken-Ichi
Chatwin-Davies, Aidan	Nogueira, Flavio S.
Chatzistavrakidis, Athanasios	Nojiri, Shin'ichi
Chen, Che-Yu	Nordhaus, Jason
Chernodub, Maxim	Nowakowski, Marek
Chernyshov, Dmitrii O.	Nozzoli, Francesco
Chervon, Sergei	Nunes, Nelson
Chiofalo, Maria Luisa	Nunes, Rafael C.
Chiosi, Cesare	Nurmagambetov, A. J.
Chodos, Alan	Nuth, Joseph A.
Choudhury, Sayantan	Obukhov, Yuri
Cirigliano, Vincenzo	Odintsov, Sergei
Claude, Semay	Oliveira, Fernando
Claudi, Riccardo	Oliveri, Roberto
Cleaver, Gerald	Orazi, Emanuele
Co, Raymond T.	Orlandini, Mauro
Cohen, Thomas	Ortega, Pablo G.
Colas, Paul	Osetrin, Konstantin
Colgain, Eoin	Oshita, Naritaka
Colgáin, Eoin Ó.	Ovalle, Jorge
Colò, Gianluca	Ovgun, Ali
Colón, Cristóbal	Oxman, Luis E.
Combrinck, Ludwig	Ozaydin, Fatih
Correa, Diego	Pagano, Davide
Cortes, Jose	Pagliara, Giuseppe
Costa, João Lopes	Pagnanini, Lorenzo
Costa, L. Filipe O.	Paic, Guy
Couchot, Francois	Pais, Helena Sofia
Coughlin, Michael	Pais, Pablo
Cremaschini, Claudio	Pala, Francesca
Criss, Robert E.	Palasantzas, George
Cristallo, Sergio	Palma, Francesco
Cristea, Irina	Palmerini, Sara
Cristofari, Pierre	Pamucar, Dragan
Cruz Osorio, Alejandro	Panotopoulos, Grigoris
Cui, Wei	Papaderos, Polychronis
Curiel, Erik	Papadimitriou, Constantinos
Cusin, Giulia	Papaioannou, Athanasios
Cvetkovic, Branislav	Papitto, Alessandro
Czerny, Bozena	Pappas, George
Czuchry, Ewa	Parkinson, David
Dabrowski, Mariusz	Parotto, Paolo
Damiani, Francesco	Partouche, Hervé
Darmora, Smita	Paschos, Emmanuel A.
Dasgupta, Keshav	Passek-Kumeriçki, Kornelija
Datta, R.	Passon, Oliver
Dave, Romeel	Pastore, Alessandro
Davidson, Aharon	Paul, Tanmoy
De Angelis, Alessandro D.	Paulos, Miguel F.
De Araujo, Jose Carlos Neves	Paunzen, Ernst
De Diego Onsurbe, José Antonio	Pavón, Diego
De Freitas-Pacheco, José Antonio	Pegoraro, Francesco
De Holanda, Pedro Cunha	Percacci, Roberto
De Jesus, José Fernando	Pereira, J. G.
De La Peña, Luis	Pereira, S. H.
De Martino, Ivan	Peres, Orlando
De Mello, Eugênio Ramos Bezerra	Perez, Alejandro
De Paolis, Francesco	Perivolaropoulos, Leandros
De Sanctis, Maria Cristina	Perrino, Roberto
Decca, Ricardo S.	Peter, Patrick
Dedkov, G. V.	Petroni, Nicola Cufaro
Degl'Innocenti, Scilla	Petrov, Albert
Degollado Daza, Juan Carlos	Petruzziello, Luciano
Degollado, Juan Carlos	Pezzella, Franco
Del Popolo, Antonino	Piatti, Andres E.
Del Sordo, Stefano	Picanço, Rodrigo
Dell'Agli, Flavia	Piemontese, Stefano
Dembinski, Hans	Pierrehumbert, Raymond
Deming, L. Drake	Pignalberi, Alessio
Demura, Alexander	Pikuz, Tatiana
Deppman, Airton	Pillepich, Annalisa
Deriglazov, Alexei	Pinčák, Richard
Descouvemont, Pierre	Pirozhenko, Irinia
Di Crescenzo, Antonia	Piscoran, Laurian-Ioan
Di Fillipo, Francesco	Pithis, Andreas G. A.
Di Giacomo, Adriano	Pitkin, Matthew D.
Di Mauro, Marco	Platania, Alessia
Di Valentino, Eleonora	Podgornik, Rudi
Dialektopoulos, Konstantinos	Poedts, Stefaan
Diamantini, Maria Cristina	Poggiani, Rosa
Dieks, Dennis	Polarski, David
Dimitrijević, Milan S.	Polonyi, Janos
Dimopoulos, Konstantinos	Polosa, Antonio D.
Dmitry, Blinov	Ponomarev, Dmitry
Dokuchaev, Vyacheslav	Popa, Lucia Aurelia
Dolgov, Alexander	Popov, Arkadiy
Domi, Alba	Popov, Sergei B.
Doneva, Daniela D.	Portillo, Israel
Doroshkevich, Andrey	Pozdeeva, Ekaterina O.
Dubeibe, Fredy L.	Preka-Papadema, Panagiota
Duranti, Matteo	Providencia, Constança
Dybalski, Wojciech	Pshirkov, Maxim
Dymnikova, Irina	Pushkarev, Alexander
Ellerman, David	Qi, Chong
Elsaesser, Dominik	Quartin, Miguel
Entem, David R.	Radinschi, Irina
Esquivel-Sirvent, R.	Raffelt, Georg
Etesi, Gabor	Raggi, Mauro
Ettori, Stefano	Rajendra, Gupta
Exirifard, Qasem	Ramos, Angels
Fabbri, Luca	Rashkov, Radoslav
Fabregat, Juan	Rastgoo, Saeed
Falciano, F. T.	Ratti, Claudia
Falls, Kevin G.	Rebouças, Marcelo
Farres, Ariadna	Reichert, Manuel
Favole, Ginevra	Ricci, Fulvio
Feng, James Q.	Richarte, Martín G.
Feoli, Antonio	Rincón, Ángel
Fermi, Davide	Ring, Peter
Fernández, Francisco	Rizos, John
Fernández-Ontiveros, Juan A.	Robertson, Hamish
Ferraro, Rafael	Rocha, Jorge
Ferreira, Márcio	Rodrigues, Davi
Ferri, Elena	Rodriguez, Manuel
Fidaleo, Francesco	Rodriguez-Lopez, Pablo
Fields, Chris	Rogatko, Marek
Figueiredo, Cosme Alexandre O. B.	Romano, Vittorio
Filippov, Anatoly Vasilievich	Romanyuk, Iosif
Fillion-Gourdeau, François	Ronga, Francesco
Finoguenov, Alexis	Roshchupkin, Sergei P.
Flachi, Antonino	Rosmej, Frank
Fomin, Igor Vladimirovich	Rott, Carsten
Fortes, Elaine C. F. S.	Rovelli, Carlo
Foschini, Luigi	Rubiera-Garcia, Diego
Foster, Adam	Rudenko, Sergei
Friedman, Yaakov	Rueda, Jorge
Fujiwara, Mamoru	Ruiz-Granados, Beatriz
Gadella, Manuel	Rybczyński, Maciej
Gail, Hans-Peter	Sá, Paulo M.
Gaite, Jose	Sabido, Miguel
Gambacurta, Danilo	Sabín, Carlos
Gao, Changjun	Sahlén, Martin
Gao, Sijie	Sahoo, Pradyumn Kumar
Garain, Sudip K.	Said, Jackson Levi
Garay, Luis J.	Salafia, Om
García Aspeitia, Miguel Angel	Salucci, Paolo
Garcia De Andrade, Luiz	Sanchez Contreras, Carmen
García-Compean, Hugo	Sanchez, Norma G.
Garcia-Hernandez, Domingo Anibal	Sánchez, Sebastian F.
Gasparrini, Dario	Santopinto, Elena
Gasperini, Maurizio	Santos, Alesandro
Gavrilov, Boris	Sapone, Domenico
Gavrilov, Sergey	Saridakis, Emmanuel
Geng, Chaoqiang	Saridakis, Manos
Gerdjikov, Vladimir Stefanov	Sasakura, Naoki
Gerontidou, Maria	Satz, Helmut
Giammarchi, Marco	Savelova, Elena
Gianotti, Paola	Scarr, Tzvi
Gieres, François	Schäfer, Gerhard
Gil-Świderska, Agnieszka	Schettino, Giulia
Giordano, Matteo	Schmidt, Michael A.
Glushkov, Alexander V.	Schmieder, Brigitte
Gnecchi, Alessandra	Schoeffler, Kevin
Godłowski, Włodzimierz	Schoppmann, Stefan
Golovnev, Alexey	Schreck, Marco
Gómez, Diego Sáez-Chillón	Schröder, Stefan
Gómez-Valent, Adrià	Sebastiani, Lorenzo
González García, Maria Concepción	Secrest, Jeffery
González Romero, Luis Manuel	Sedaghati, Elyar
Good, Michael R. R.	Sedrakian, Armen
Goodsell, Mark	Seo, Min-Seok
Gorbunov, Dmitry	Sesana, Alberto
Gordon, Christopher	Sgalaberna, Davide
Goudarzi, Mohammad Ali	Sgouros, Onoufrios
Gourgouliatos, Konstantinos	Shankar, Karthik H.
Grassi, Pietro Antonio	Shapiro, Ilya
Graziani, Luca	Shapiro, Irwin
Greensite, Jeffrey Paul	Sharov, German Sergeevich
Grib, A. A.	Shen, Fang
Grøn, Øyvind	Sheykin, Anton A.
Grunfeld, Ana Gabriela	Shi, Jianrong
Guendelman, Eduardo	Shore, Graham
Guimarães, Marcelo	Shtanov, Yuri
Gulminelli, Francesca	Silva, Marcos V. De S.
Guo, Fengkun	Simpson, Alex
Guo, Minyong	Singleton, Douglas
Guo, Yiqing	Sinitsyna, Vera
Gupt, Brajesh	Smirnov, Alexei
Gusakov, Mikhail	Smolić, Ivica
Guzmán, María José	Sneden, Chris
Hamber, Herbert W.	Sofue, Yoshiaki
Hands, Simon	Sohn, Jubee
Harabasz, Szymon Piotr	Sokoloff, Dmitry
Harremoës, Peter	Solà, Joan
Hawton, Margaret	Soler, Paul
Hayakawa, Takehito	Soma, Arun Kumar
Hayashi, Keiji	Sonnino, Giorgio
Heinemann, Stephan G.	Sorriso-Valvo, Luca
Helayel-Neto, J. A.	Sparvoli, Roberta
Helayel-Neto, Jose	Spurio, Maurizio
Held, Aaron	Spyrou, Nikolaos K.
Henriksen, Mark	Stachurska, Juliana
Hervet, Olivier	Staicova, Denitsa
Hirotani, Kouichi	Stamerra, Antonio
Hochlaf, Majdi	Starobinsky, Alexei A.
Hoelbling, Christian	Stasielak, Jarosław
Hoffmann, Andreas	Staykov, Kalin V.
Hofmann, Ralf	Steffen, Gielen
Hofmeister, Anne	Steinheimer, Jan
Hohmann, Manuel	Stenflo, Lennart
Homola, Piotr	Stoica, Sabin
Hong, Byungsik	Stornaiolo, Cosimo
Horatiu, Nastase	Stratta, Giulia
Horn, Bart	Strong, Andrew W.
Høye, Johan	Sultana, Joseph
Hu, Bin	Sushkov, Sergei
Huang, Feifei	Tan, Baolin
Hugbart, Mathilde	Tang, Qingwen
Ichiki, Kiyotomo	Tartaglia, Angelo
Iguchi, Hideo	Tedesco, Luigi
Impens, Francois	Teixeira Alves, Danilo
Inagaki, Tomohiro	Terranova, Francesco
Incicchitti, Antonella	Tessarotto, Massimo
Ingold, Gert-Ludwig	Thompson, David J.
Iorio, Alfredo	Titov, Arsenii
Iorio, Lorenzo	Tiwari, Prabhakar
Itaco, Nunzio	Tiwari, Shubhanshu
Ivanov, Martin V.	Tomasiello, Alessandro
Jana, Sudip	Tomassetti, Nicola
Janssen, Oliver	Tommei, Giacomo
Järv, Laur	Toribio, Alan Miguel Velasquez
Jawad, Abdul	Triantafyllopoulos, Alkiviadis
Jiang, Biwei	Trushkin, Sergei
Jokela, Niko	Turimov, Bobur
Jonke, Larisa	Typel, Stefan
Jora, Renata	Urban, Michael
Jordi, Carme	Valcarcel, Jorge Gigante
Joung, Euihun	Vallenari, Antonella
Junker, Georg	Van De Meent, Maarten
Jusufi, Kimet	Van de Steene, Griet C.
Kalantonis, Vassilis	Van Den Heuvel, Edward P. J.
Kallunki, Juha	Vandevender, John Pace
Kamenshchik, A. Yu	Varekamp, Johan
Kaminker, Alexander D.	Varieschi, Gabriele U.
Kannawadi, Arun	Vasko, Ivan Y.
Karbstein, Felix	Vassilevich, Dmitri
Karch, Andreas	Vazquez, J. Alberto
Kasetti, Siva Prasad	Velten, Hermano
Kashi, Amit	Ventura, Paolo
Katsova, Maria	Veres, Péter
Kazanas, Demosthenes	Vernieri, Daniele
Keppens, Arno	Villaseñor, Eduardo J. S.
Kerner, Richard	Vilmer, Nicole
Ketov, Sergei	Vink, Jacco
Khan, Amir N.	Visinelli, Luca
Khanna, Faqir C.	Visser, Manus
Khlopov, Maxim	Vitiello, Giuseppe
Khurshudyan, Martiros	Von Marttens, Rodrigo
Khusnutdinov, Nail	Wagner, Fabian
Kieda, David	Wagner, Jenny
Kim, Choong	Waldron, Abbey
Kim, Dong-Woo	Wang, Anzhong
Kim, Nakwoo	Wang, Gaige
Kirillov, Alexander	Wang, Qiliang
Kirschner, Roland	Wang, Shao-Jiang
Kislov, Roman	Wascko, Morgan
Kisslinger, Leonard S.	Weber, Fridolin
Kitamoto, Shunjii	Weissman, Dorin
Kleidis, Kostas	Wette, Karl
Klimenko, Maksim V.	Wiita, Paul
Knecht, Andreas	Williams, David A.
Knorr, Benjamin	Winstanley, Elizabeth
Kocharyan, Armen A.	Wong, Chik Him
Kohri, Kazunori	Wysokinski, Karol I.
Kole, Merlin Reynaard	Xie, Fuguo
Kološ, Martin	Xu, Renxin
Komissarov, Serguei S.	Xu, Rui
Konishi, Kenichi	Yamada, Masatoshi
Kosinski, Piotr	Yates, Jeremy A.
Kosmas, Theocharis	Yeom, Dong-han
Kotikov, Anatoly	Yoshii, Ryosuke
Kotila, Jenni	Youssef Moussa, Miled Hassan
Kraniotis, Georgios V.	Yungelson, Lev R.
Kratz, Karl-Ludwig	Zabrodin, Evgeny
Krssak, Martin	Zakharov, Alexander
Kuin, Paul	Zhang, Baocheng
Kun, Emma	Zhang, Fan
Kunz, Martin	Zhang, Guohui
Laha, Sibasish	Zhang, Haocheng
Laliotis, Athanasios	Zhao, Hongsheng
Lapi, Andrea	Zhong, Jiahao
Latosh, Boris	Ziaeepour, Houri
Leahy, Denis	Zijlstra, Albert
Lebiedowicz, Piotr	Zimovets, Ivan
Lee, Chien-Hsiu	Zivieri, Roberto
Lee, Hyun Su	Zong, Qiugang
Leisos, Antonios	Zubkov, Mikhail
Lenske, Horst	Zugec, Peter
León, Alejandro	Zyuzin, Dmitry A.
Leontaris, George K.