Get quick answers to your questions about the article from our AI researcher chatbot
{'id': 'https://openalex.org/W2887823924', 'doi': 'https://doi.org/10.1016/j.physletb.2018.12.025', 'title': 'Blue-tilted primordial gravitational waves from massive gravity', 'display_name': 'Blue-tilted primordial gravitational waves from massive gravity', 'publication_year': 2019, 'publication_date': '2019-02-01', 'ids': {'openalex': 'https://openalex.org/W2887823924', 'doi': 'https://doi.org/10.1016/j.physletb.2018.12.025', 'mag': '2887823924'}, 'language': 'en', 'primary_location': {'is_oa': True, 'landing_page_url': 'https://doi.org/10.1016/j.physletb.2018.12.025', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S173952182', 'display_name': 'Physics Letters B', 'issn_l': '0370-2693', 'issn': ['0370-2693', '1873-2445'], 'is_oa': True, 'is_in_doaj': True, 'is_core': True, 'host_organization': 'https://openalex.org/P4310320990', 'host_organization_name': 'Elsevier BV', 'host_organization_lineage': ['https://openalex.org/P4310320990'], 'host_organization_lineage_names': ['Elsevier BV'], 'type': 'journal'}, 'license': 'cc-by', 'license_id': 'https://openalex.org/licenses/cc-by', 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, 'type': 'article', 'type_crossref': 'journal-article', 'indexed_in': ['arxiv', 'crossref', 'datacite', 'doaj'], 'open_access': {'is_oa': True, 'oa_status': 'diamond', 'oa_url': 'https://doi.org/10.1016/j.physletb.2018.12.025', 'any_repository_has_fulltext': True}, 'authorships': [{'author_position': 'first', 'author': {'id': 'https://openalex.org/A5000161232', 'display_name': 'Tomohiro Fujita', 'orcid': 'https://orcid.org/0000-0003-4722-7432'}, 'institutions': [{'id': 'https://openalex.org/I22299242', 'display_name': 'Kyoto University', 'ror': 'https://ror.org/02kpeqv85', 'country_code': 'JP', 'type': 'education', 'lineage': ['https://openalex.org/I22299242']}], 'countries': ['JP'], 'is_corresponding': True, 'raw_author_name': 'Tomohiro Fujita', 'raw_affiliation_strings': ['Department of Physics, Kyoto University, Kyoto, 606-8502, Japan'], 'affiliations': [{'raw_affiliation_string': 'Department of Physics, Kyoto University, Kyoto, 606-8502, Japan', 'institution_ids': ['https://openalex.org/I22299242']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5014970846', 'display_name': 'Sachiko Kuroyanagi', 'orcid': 'https://orcid.org/0000-0001-6538-1447'}, 'institutions': [{'id': 'https://openalex.org/I60134161', 'display_name': 'Nagoya University', 'ror': 'https://ror.org/04chrp450', 'country_code': 'JP', 'type': 'education', 'lineage': ['https://openalex.org/I60134161']}], 'countries': ['JP'], 'is_corresponding': False, 'raw_author_name': 'Sachiko Kuroyanagi', 'raw_affiliation_strings': ['Department of Physics, Nagoya University, Chikusa, Nagoya 464-8602, Japan'], 'affiliations': [{'raw_affiliation_string': 'Department of Physics, Nagoya University, Chikusa, Nagoya 464-8602, Japan', 'institution_ids': ['https://openalex.org/I60134161']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5103067903', 'display_name': 'Shuntaro Mizuno', 'orcid': 'https://orcid.org/0000-0002-2304-1708'}, 'institutions': [{'id': 'https://openalex.org/I22299242', 'display_name': 'Kyoto University', 'ror': 'https://ror.org/02kpeqv85', 'country_code': 'JP', 'type': 'education', 'lineage': ['https://openalex.org/I22299242']}], 'countries': ['JP'], 'is_corresponding': False, 'raw_author_name': 'Shuntaro Mizuno', 'raw_affiliation_strings': ['Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan'], 'affiliations': [{'raw_affiliation_string': 'Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan', 'institution_ids': ['https://openalex.org/I22299242']}]}, {'author_position': 'last', 'author': {'id': 'https://openalex.org/A5047518661', 'display_name': 'Shinji Mukohyama', 'orcid': 'https://orcid.org/0000-0002-9934-2785'}, 'institutions': [{'id': 'https://openalex.org/I22299242', 'display_name': 'Kyoto University', 'ror': 'https://ror.org/02kpeqv85', 'country_code': 'JP', 'type': 'education', 'lineage': ['https://openalex.org/I22299242']}, {'id': 'https://openalex.org/I166644833', 'display_name': 'Kavli Institute for the Physics and Mathematics of the Universe', 'ror': 'https://ror.org/02chw6z69', 'country_code': 'JP', 'type': 'facility', 'lineage': ['https://openalex.org/I166644833']}, {'id': 'https://openalex.org/I74801974', 'display_name': 'The University of Tokyo', 'ror': 'https://ror.org/057zh3y96', 'country_code': 'JP', 'type': 'education', 'lineage': ['https://openalex.org/I74801974']}], 'countries': ['JP'], 'is_corresponding': False, 'raw_author_name': 'Shinji Mukohyama', 'raw_affiliation_strings': ['Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan', 'Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan'], 'affiliations': [{'raw_affiliation_string': 'Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan', 'institution_ids': ['https://openalex.org/I22299242']}, {'raw_affiliation_string': 'Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan', 'institution_ids': ['https://openalex.org/I166644833', 'https://openalex.org/I74801974']}]}], 'countries_distinct_count': 1, 'institutions_distinct_count': 4, 'corresponding_author_ids': ['https://openalex.org/A5000161232'], 'corresponding_institution_ids': ['https://openalex.org/I22299242'], 'apc_list': {'value': 0, 'currency': 'USD', 'value_usd': 0, 'provenance': 'doaj'}, 'apc_paid': None, 'fwci': 3.293, 'has_fulltext': True, 'fulltext_origin': 'pdf', 'cited_by_count': 35, 'citation_normalized_percentile': {'value': 0.99995, 'is_in_top_1_percent': True, 'is_in_top_10_percent': True}, 'cited_by_percentile_year': {'min': 95, 'max': 96}, 'biblio': {'volume': '789', 'issue': None, 'first_page': '215', 'last_page': '219'}, 'is_retracted': False, 'is_paratext': False, 'primary_topic': {'id': 'https://openalex.org/T10463', 'display_name': 'Observation and Study of Gravitational Waves Phenomenon', 'score': 0.9999, 'subfield': {'id': 'https://openalex.org/subfields/3103', 'display_name': 'Astronomy and Astrophysics'}, 'field': {'id': 'https://openalex.org/fields/31', 'display_name': 'Physics and Astronomy'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}, 'topics': [{'id': 'https://openalex.org/T10463', 'display_name': 'Observation and Study of Gravitational Waves Phenomenon', 'score': 0.9999, 'subfield': {'id': 'https://openalex.org/subfields/3103', 'display_name': 'Astronomy and Astrophysics'}, 'field': {'id': 'https://openalex.org/fields/31', 'display_name': 'Physics and Astronomy'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}, {'id': 'https://openalex.org/T10095', 'display_name': 'Cosmological Parameters and Dark Energy', 'score': 0.9998, 'subfield': {'id': 'https://openalex.org/subfields/3103', 'display_name': 'Astronomy and Astrophysics'}, 'field': {'id': 'https://openalex.org/fields/31', 'display_name': 'Physics and Astronomy'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}, {'id': 'https://openalex.org/T11405', 'display_name': 'Global Sea Level Variability and Change', 'score': 0.999, 'subfield': {'id': 'https://openalex.org/subfields/1910', 'display_name': 'Oceanography'}, 'field': {'id': 'https://openalex.org/fields/19', 'display_name': 'Earth and Planetary Sciences'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}], 'keywords': [{'id': 'https://openalex.org/keywords/massless-particle', 'display_name': 'Massless particle', 'score': 0.736083}, {'id': 'https://openalex.org/keywords/gravitational-waves', 'display_name': 'Gravitational Waves', 'score': 0.547077}], 'concepts': [{'id': 'https://openalex.org/C130044071', 'wikidata': 'https://www.wikidata.org/wiki/Q103585', 'display_name': 'Graviton', 'level': 3, 'score': 0.94309115}, {'id': 'https://openalex.org/C121332964', 'wikidata': 'https://www.wikidata.org/wiki/Q413', 'display_name': 'Physics', 'level': 0, 'score': 0.894091}, {'id': 'https://openalex.org/C190330329', 'wikidata': 'https://www.wikidata.org/wiki/Q190035', 'display_name': 'Gravitational wave', 'level': 2, 'score': 0.8901199}, {'id': 'https://openalex.org/C54937798', 'wikidata': 'https://www.wikidata.org/wiki/Q2024141', 'display_name': 'Massless particle', 'level': 2, 'score': 0.736083}, {'id': 'https://openalex.org/C207297109', 'wikidata': 'https://www.wikidata.org/wiki/Q15605', 'display_name': 'Cosmic microwave background', 'level': 3, 'score': 0.6700101}, {'id': 'https://openalex.org/C200941418', 'wikidata': 'https://www.wikidata.org/wiki/Q273508', 'display_name': 'Inflation (cosmology)', 'level': 2, 'score': 0.5688411}, {'id': 'https://openalex.org/C180205008', 'wikidata': 'https://www.wikidata.org/wiki/Q159190', 'display_name': 'Amplitude', 'level': 2, 'score': 0.54563}, {'id': 'https://openalex.org/C44870925', 'wikidata': 'https://www.wikidata.org/wiki/Q37547', 'display_name': 'Astrophysics', 'level': 1, 'score': 0.50380796}, {'id': 'https://openalex.org/C107195408', 'wikidata': 'https://www.wikidata.org/wiki/Q2302080', 'display_name': 'Gravitational-wave observatory', 'level': 3, 'score': 0.48628175}, {'id': 'https://openalex.org/C166689943', 'wikidata': 'https://www.wikidata.org/wiki/Q850283', 'display_name': 'Interferometry', 'level': 2, 'score': 0.47875375}, {'id': 'https://openalex.org/C124017977', 'wikidata': 'https://www.wikidata.org/wiki/Q11412', 'display_name': 'Gravitation', 'level': 2, 'score': 0.45171645}, {'id': 'https://openalex.org/C3079626', 'wikidata': 'https://www.wikidata.org/wiki/Q234881', 'display_name': 'Quantum electrodynamics', 'level': 1, 'score': 0.4398404}, {'id': 'https://openalex.org/C1276947', 'wikidata': 'https://www.wikidata.org/wiki/Q333', 'display_name': 'Astronomy', 'level': 1, 'score': 0.28556046}, {'id': 'https://openalex.org/C109214941', 'wikidata': 'https://www.wikidata.org/wiki/Q18334', 'display_name': 'Particle physics', 'level': 1, 'score': 0.22509325}, {'id': 'https://openalex.org/C120665830', 'wikidata': 'https://www.wikidata.org/wiki/Q14620', 'display_name': 'Optics', 'level': 1, 'score': 0.16105217}, {'id': 'https://openalex.org/C85725439', 'wikidata': 'https://www.wikidata.org/wiki/Q466686', 'display_name': 'Anisotropy', 'level': 2, 'score': 0.0}], 'mesh': [], 'locations_count': 4, 'locations': [{'is_oa': True, 'landing_page_url': 'https://doi.org/10.1016/j.physletb.2018.12.025', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S173952182', 'display_name': 'Physics Letters B', 'issn_l': '0370-2693', 'issn': ['0370-2693', '1873-2445'], 'is_oa': True, 'is_in_doaj': True, 'is_core': True, 'host_organization': 'https://openalex.org/P4310320990', 'host_organization_name': 'Elsevier BV', 'host_organization_lineage': ['https://openalex.org/P4310320990'], 'host_organization_lineage_names': ['Elsevier BV'], 'type': 'journal'}, 'license': 'cc-by', 'license_id': 'https://openalex.org/licenses/cc-by', 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, {'is_oa': False, 'landing_page_url': 'https://doaj.org/article/26dd397af9db4a35ab17d0fd4cb057fb', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S4306401280', 'display_name': 'DOAJ (DOAJ: Directory of Open Access Journals)', 'issn_l': None, 'issn': None, 'is_oa': True, 'is_in_doaj': False, 'is_core': False, 'host_organization': None, 'host_organization_name': None, 'host_organization_lineage': [], 'host_organization_lineage_names': [], 'type': 'repository'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}, {'is_oa': True, 'landing_page_url': 'https://arxiv.org/abs/1808.02381', 'pdf_url': 'https://arxiv.org/pdf/1808.02381', 'source': {'id': 'https://openalex.org/S4306400194', 'display_name': 'arXiv (Cornell University)', 'issn_l': None, 'issn': None, 'is_oa': True, 'is_in_doaj': False, 'is_core': False, 'host_organization': 'https://openalex.org/I205783295', 'host_organization_name': 'Cornell University', 'host_organization_lineage': ['https://openalex.org/I205783295'], 'host_organization_lineage_names': ['Cornell University'], 'type': 'repository'}, 'license': None, 'license_id': None, 'version': 'submittedVersion', 'is_accepted': False, 'is_published': False}, {'is_oa': False, 'landing_page_url': 'https://api.datacite.org/dois/10.48550/arxiv.1808.02381', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S4393179698', 'display_name': 'DataCite API', 'issn_l': None, 'issn': None, 'is_oa': True, 'is_in_doaj': False, 'is_core': False, 'host_organization': 'https://openalex.org/I4210145204', 'host_organization_name': 'DataCite', 'host_organization_lineage': ['https://openalex.org/I4210145204'], 'host_organization_lineage_names': ['DataCite'], 'type': 'metadata'}, 'license': None, 'license_id': None, 'version': None}], 'best_oa_location': {'is_oa': True, 'landing_page_url': 'https://doi.org/10.1016/j.physletb.2018.12.025', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S173952182', 'display_name': 'Physics Letters B', 'issn_l': '0370-2693', 'issn': ['0370-2693', '1873-2445'], 'is_oa': True, 'is_in_doaj': True, 'is_core': True, 'host_organization': 'https://openalex.org/P4310320990', 'host_organization_name': 'Elsevier BV', 'host_organization_lineage': ['https://openalex.org/P4310320990'], 'host_organization_lineage_names': ['Elsevier BV'], 'type': 'journal'}, 'license': 'cc-by', 'license_id': 'https://openalex.org/licenses/cc-by', 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, 'sustainable_development_goals': [], 'grants': [{'funder': 'https://openalex.org/F4320320912', 'funder_display_name': 'Ministry of Education, Culture, Sports, Science and Technology', 'award_id': None}, {'funder': 'https://openalex.org/F4320334764', 'funder_display_name': 'Japan Society for the Promotion of Science', 'award_id': '17H02890'}, {'funder': 'https://openalex.org/F4320334764', 'funder_display_name': 'Japan Society for the Promotion of Science', 'award_id': '17H06359'}], 'datasets': [], 'versions': ['https://openalex.org/W2887823924'], 'referenced_works_count': 39, 'referenced_works': ['https://openalex.org/W1646853867', 'https://openalex.org/W1763198672', 'https://openalex.org/W1876924780', 'https://openalex.org/W2025576938', 'https://openalex.org/W2070486952', 'https://openalex.org/W2073509179', 'https://openalex.org/W2078616802', 'https://openalex.org/W2089744738', 'https://openalex.org/W2090473361', 'https://openalex.org/W2096367114', 'https://openalex.org/W2097968935', 'https://openalex.org/W2106679319', 'https://openalex.org/W2108728462', 'https://openalex.org/W2112818797', 'https://openalex.org/W2114832931', 'https://openalex.org/W2121634014', 'https://openalex.org/W2150408793', 'https://openalex.org/W2168780325', 'https://openalex.org/W2169587009', 'https://openalex.org/W2179329759', 'https://openalex.org/W2274160807', 'https://openalex.org/W2483046335', 'https://openalex.org/W2587879786', 'https://openalex.org/W2763837342', 'https://openalex.org/W2765219784', 'https://openalex.org/W2766754978', 'https://openalex.org/W2766966220', 'https://openalex.org/W2994984874', 'https://openalex.org/W3037205021', 'https://openalex.org/W3037311074', 'https://openalex.org/W3101005483', 'https://openalex.org/W3102031542', 'https://openalex.org/W3102344095', 'https://openalex.org/W3102742247', 'https://openalex.org/W3103597992', 'https://openalex.org/W3105822145', 'https://openalex.org/W3105981474', 'https://openalex.org/W3106202993', 'https://openalex.org/W3154367060'], 'related_works': ['https://openalex.org/W4388694287', 'https://openalex.org/W4387560122', 'https://openalex.org/W4309417397', 'https://openalex.org/W4281922867', 'https://openalex.org/W2963216133', 'https://openalex.org/W2761827246', 'https://openalex.org/W2520493330', 'https://openalex.org/W2112438183', 'https://openalex.org/W2041640074', 'https://openalex.org/W1986485932'], 'abstract_inverted_index': {'We': [0, 54], 'study': [1], 'a': [2, 28], 'theory': [3], 'of': [4], 'massive': [5], 'tensor': [6], 'gravitons': [7, 31, 49], 'which': [8, 50], 'predicts': [9], 'blue-tilted': [10], 'and': [11, 37], 'largely': [12], 'amplified': [13, 44], 'primordial': [14], 'gravitational': [15, 58], 'waves.': [16], 'After': [17], 'inflation,': [18], 'while': [19], 'their': [20, 39, 68], 'mass': [21], 'is': [22, 70], 'significant': [23], 'until': [24], 'it': [25], 'diminishes': [26], 'to': [27, 46], 'small': [29], 'value,': [30], 'are': [32], 'diluted': [33], 'as': [34, 52], 'non-relativistic': [35], 'matter': [36], 'hence': [38], 'amplitude': [40], 'can': [41, 60], 'be': [42, 61], 'substantially': [43], 'compared': [45], 'the': [47, 74], 'massless': [48], 'decay': [51], 'radiation.': [53], 'show': [55], 'that': [56], 'such': [57], 'waves': [59], 'detected': [62], 'by': [63], 'interferometer': [64], 'experiments,': [65], 'even': [66], 'if': [67], 'signal': [69], 'not': [71], 'observed': [72], 'on': [73], 'CMB': [75], 'scales.': [76]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2887823924', 'counts_by_year': [{'year': 2024, 'cited_by_count': 4}, {'year': 2023, 'cited_by_count': 4}, {'year': 2022, 'cited_by_count': 2}, {'year': 2021, 'cited_by_count': 11}, {'year': 2020, 'cited_by_count': 5}, {'year': 2019, 'cited_by_count': 8}, {'year': 2018, 'cited_by_count': 1}], 'updated_date': '2024-09-13T13:39:17.159825', 'created_date': '2018-08-22'}